Curtain airbag device

Abstract

The present invention addresses the problem of improving a curtain airbag device. This curtain airbag device is provided with: an airbag body which is inflated and deployed by being supplied with inflation gas; and an inner container, at least a part of which is disposed in the airbag main body, and which is supplied with inflation gas from the outside to control the flow of the inflation gas into the airbag main body. The airbag main body is provided with: a first inflation chamber which is inflated by an inflation gas and thereby mitigates an impact on a protected object in the moving body; a first orifice through which the gas for expansion flowing into the first expansion chamber flows; a first sub-chamber which is provided so as to adjust the expansion mode of the first expansion chamber and which receives an expansion gas; and a second orifice through which the expansion gas flowing into the first sub-chamber flows. The inner container has a first expansion chamber opening that is disposed at a position facing the first orifice and that discharges the gas for expansion.

Description

Technical Field

[0001] The technology of the present invention relates to a curtain airbag device. Background Art

[0002] Currently, there is a curtain airbag device that protects passengers when a vehicle is hit from the side by another vehicle or when the vehicle overturns laterally. The curtain airbag device of Patent Document 1 includes: an inflator that supplies inflation gas; and an airbag that is supplied with inflation gas and inflates and deploys between the passenger and the side wall portion from a position higher than the side wall portion of the vehicle. The airbag includes an airbag body and an inner liner. The airbag body includes a connecting portion. The inner liner includes: an inner liner body that is arranged in the airbag body and has a gas outflow port; and an insertion portion that is arranged in the connecting portion of the airbag body and into which a part of the inflator is inserted.

[0003] In addition, currently, regarding vehicles, a curtain airbag device, which is a passenger protection device provided on a side wall portion in a vehicle compartment, has an airbag that is deployed between the side wall portion and the passenger by being supplied with inflation gas. In order to adjust the internal pressure of the airbag, there is a method in which the airbag has a sub-chamber as disclosed in Patent Document 2, for example.

[0004] The main chamber and the sub-chamber of the airbag are the parts that expand when the inflation gas is deployed. The main chamber mainly protects the head of the occupant. The sub-chamber not only protects the occupant, but also adjusts the internal pressure of the main chamber by connecting to the main chamber.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2022-42944

[0006] Patent Document 2: Japanese Patent Application Publication No. 2018-016165

[0007] In recent years, with respect to curtain airbags, it is necessary to meet the required specifications for multiple parameters such as the distance from each reference position in the vehicle, the deployment time, the maximum load, and the amount of energy absorbed, for multiple striking points specified on the airbag. However, for example, if the inflation gas is supplied to the airbag body at a sufficient rate in order to inflate the entire airbag body at an early stage, the reaction force applied to the protected object at a portion of the airbag body that needs to mitigate the impact on the protected object is sometimes increased, and the required specifications for the maximum load are not met. In this way, with respect to curtain airbags, it is not easy to meet high requirements for multiple parameters at each striking point (Japanese "hitting point") specified on the airbag. In addition, in order to meet the requirements for multiple parameters at all striking points, a large amount of inflation gas is sometimes supplied. Therefore, there is still room for further improvement in the structure of the curtain airbag device.

[0008] In addition, the main chamber and the sub-chamber of the airbag are provided by forming a non-expandable portion in the airbag. Specifically, the non-expandable portion is a joint portion formed by partially joining two pieces of fabric constituting the airbag by sewing. The non-expandable portion is formed between the main chamber and the sub-chamber in order to divide the main chamber and the sub-chamber. Therefore, in the non-expandable portion, stress concentration may sometimes occur due to the expansion of the main chamber and the sub-chamber when the airbag is deployed. Summary of the invention

[0009] The technology of the present invention can be implemented in the following manner.

[0010] (1) According to one aspect of the technology of the present invention, a curtain airbag device for a mobile body is provided. The curtain airbag device for a mobile body comprises: an airbag body that is inflated and deployed by being supplied with inflation gas; and an inner liner, at least a portion of which is arranged in the airbag body and is supplied with inflation gas from the outside to control the flow of inflation gas into the airbag body. The airbag body comprises: a first inflation chamber that is inflated by the inflation gas, thereby alleviating the impact on the protected object in the mobile body; a first orifice that allows the inflation gas flowing into the first inflation chamber to flow; a first auxiliary chamber that is provided to adjust the inflation mode of the first inflation chamber and receives the inflation gas; and a second orifice that allows the inflation gas flowing into the first auxiliary chamber to flow. The inner liner has a first inflation chamber opening that is arranged at a position opposite to the first orifice and discharges the inflation gas.

[0011] In this method, the following effect is obtained by adjusting the size of the opening of the first expansion chamber of the inner liner, and the shapes of the first orifice, the second orifice, and the first auxiliary chamber. That is, the amount of expansion gas flowing into the first expansion chamber and the amount of expansion gas flowing into the first auxiliary chamber can be adjusted as time passes from the start of the supply of the expansion gas.

[0012] As a result, the expansion mode of the first expansion chamber can be appropriately controlled as time passes from the start of supply of the expansion gas.

[0013] (2) In the curtain airbag device of the above aspect, the inner liner may further include a first auxiliary chamber opening disposed at a position facing the second port and configured to discharge inflation gas.

[0014] In this method, the following effect is obtained by adjusting the size of the first expansion chamber opening and the first auxiliary chamber opening of the inner liner, and the shapes of the first orifice, the second orifice, and the first auxiliary chamber. That is, the amount of expansion gas flowing into the first expansion chamber and the amount of expansion gas flowing into the first auxiliary chamber can be more appropriately adjusted as time passes from the start of the supply of the expansion gas.

[0015] (3) Based on the curtain airbag device of the above-mentioned embodiment, it can also be formed as follows, that is, the airbag body also has: a second expansion chamber, which is expanded by the inflation gas, thereby mitigating the impact on the protected object in the moving body, and is arranged on the front side relative to the first expansion chamber; and a third expansion chamber, which is expanded by the inflation gas, thereby mitigating the impact on the protected object in the moving body, and is arranged on the rear side relative to the first expansion chamber, and the inner liner also has: a second expansion chamber opening, which discharges the inflation gas into the second expansion chamber; and a third expansion chamber opening, which discharges the inflation gas into the third expansion chamber.

[0016] In this method, the following effect is obtained by adjusting the size of the opening of the second expansion chamber and the opening of the third expansion chamber based on the size of the opening of the first expansion chamber and the opening of the first auxiliary chamber of the inner liner, and the shape of the first orifice, the second orifice, and the first auxiliary chamber. That is, the amount of expansion gas flowing into the first expansion chamber, the amount of expansion gas flowing into the second expansion chamber, the amount of expansion gas flowing into the third expansion chamber, and the amount of expansion gas flowing into the first auxiliary chamber can be adjusted. As a result, the expansion mode of the first expansion chamber, the second expansion chamber, and the third expansion chamber can be appropriately controlled.

[0017] (4) Based on the above-mentioned curtain airbag device, it can also be formed as follows, that is, the airbag body also has: a connecting orifice, which connects the first expansion chamber and the second expansion chamber; a second sub-chamber, which receives the inflation gas and is connected to the first expansion chamber and has a smaller capacity than the first sub-chamber; and a second sub-chamber orifice, which allows the inflation gas flowing into the second sub-chamber to circulate, and is arranged on the opposite side of the first orifice relative to the connecting orifice.

[0018] With this method, the expansion modes of at least the first expansion chamber and the second expansion chamber can be more appropriately controlled by adjusting the size and arrangement of the communicating orifice, the size and arrangement of the second auxiliary chamber, and the size and arrangement of the second auxiliary chamber orifice.

[0019] (5) Based on the above-mentioned curtain airbag device, it can also be formed as follows, that is, the first expansion chamber is located closer to a pillar than the second expansion chamber and the third expansion chamber in the front-rear direction of the moving body, and the pillar supports the roof of the moving body and at least one of the doors of the moving body.

[0020] In this aspect, by appropriately controlling the expansion mode of the first expansion chamber, it is possible to prevent the protection target in the mobile body from colliding with the support column.

[0021] (6) Based on the above-mentioned curtain airbag device, it can also be formed as follows, that is, the depth of the first sub-chamber along the flow direction of the inflation gas is greater than the width of the second orifice, and the depth of the second sub-chamber along the flow direction of the inflation gas is greater than the width of the second sub-chamber orifice.

[0022] By adopting this configuration, compared with a configuration in which the depth of each sub chamber is smaller than the width of the orifice of each sub chamber, the expansion modes of the first expansion chamber and the second expansion chamber can be appropriately controlled for a longer period of time.

[0023] (7) In the curtain airbag device of the above aspect, the depth of the first auxiliary chamber along the flow direction of the inflation gas may be greater than the width of the second opening.

[0024] By adopting this configuration, compared with a configuration in which the depth of the first sub chamber is smaller than the width of the second orifice, the expansion mode of the first expansion chamber can be appropriately controlled for a longer period of time.

[0025] (8) Based on the above-mentioned curtain airbag device, it can also be formed as follows, that is, the first sub-chamber has: a first part, which extends rearward from a position below the inner liner; a second part, which is arranged below the first part and extends rearward from a position below the inner liner; and a third part, which connects the rear end of the first part and the rear end of the second part.

[0026] By setting it in this way, the depth of the first sub-chamber can be ensured, the expansion mode of the first expansion chamber can be properly controlled for a longer time, and the first sub-chamber can be used to support and move the protected object in the body over a large range in the front-to-back direction and the up-down direction.

[0027] (9) According to another aspect of the present invention, there is provided a curtain airbag device for a mobile body.

[0028] The curtain airbag device has an airbag body that is inflated and deployed by being supplied with inflation gas. The airbag body has: a plurality of non-inflatable parts that are parts joined to a fabric constituting the airbag body; an expansion chamber and a sub-chamber that are inflation parts respectively surrounded by one or more non-inflatable parts among the plurality of non-inflatable parts; a plurality of orifices that allow the inflation gas received by the expansion chamber or the sub-chamber to flow; and one or more connecting flow paths that connect the expansion chamber and the sub-chamber. The expansion chamber is inflated by being supplied with inflation gas, thereby relieving the impact on the protected object caused by contact with the protected object in the mobile body. The sub-chamber adjusts the inflation mode of the expansion chamber by receiving inflation gas. The plurality of orifices include one or more sub-chamber orifices leading to the connecting flow path. The plurality of non-inflatable parts include a partitioned non-inflatable part that partitions the expansion chamber and the sub-chamber, and the partitioned non-inflatable part is provided to be longer than the width of the sub-chamber orifice.

[0029] By adopting this configuration, the force received by the partitioned non-expandable portion when the airbag body is deployed can be entirely received by the partitioned non-expandable portion provided longer than the width of the sub chamber opening.

[0030] Therefore, compared with a method in which the non-expanded portion is shorter than the width of the auxiliary chamber orifice, for example, a method in which the main chamber and the auxiliary chamber are divided by a plurality of dot-shaped or island-shaped non-expanded portions, stress concentration is less likely to occur in the divided non-expanded portions.

[0031] (10) In the above aspect, the partitioned non-expandable portion may further include: a branch portion branching into two branches at an end of the partitioned non-expandable portion; and an arcuate portion connecting the respective front ends of the branch portions.

[0032] By adopting this configuration, stress concentration is less likely to occur at the end portion defining the non-expanded portion, compared with a configuration in which the end portion defining the non-expanded portion does not have a closed portion formed by the arc-shaped portion or the branch portion.

[0033] (11) In the above aspect, the sub chamber may have only one opening, and the sub chamber orifice may be configured to function as the opening of the sub chamber.

[0034] By setting it in this way, the amount of inflation gas that can flow into the sub-chamber is limited to the size of the sub-chamber. That is, the amount of inflation gas that flows out of the main chamber is also limited. Therefore, the curtain airbag device of the present invention can easily adjust the internal pressure of the main chamber by adjusting the size of the sub-chamber. Therefore, the curtain airbag device of the present invention can more effectively mitigate the impact on the protected object.

[0035] (12) In the above aspect, the communication flow path may be arranged on the rear side relative to the expansion chamber and configured to function as the expansion portion.

[0036] By setting it in this way, the volume of the communication flow path becomes larger than that of the flow path for inflation gas only. That is, the flow of inflation gas between the main chamber and the sub-chamber becomes slower. Therefore, the curtain airbag device of the present invention slows down the pressure change of the main chamber caused by contact with the protected object, and can alleviate the impact on the protected object.

[0037] (13) Based on the above method, it can be formed that the airbag body also has a first expansion chamber orifice among the multiple orifices that serves as the opening of the expansion chamber, and the first expansion chamber orifice leads to the connecting flow path, and the width of the first expansion chamber orifice is greater than the width of the sub-chamber orifice.

[0038] In this case, the inflation gas in the main chamber flows out to the sub chamber more easily than when the width of the first inflation chamber opening is smaller than that of the sub chamber opening. Therefore, the curtain airbag device of the present invention can mitigate the impact by easily adjusting the pressure of the main chamber.

[0039] (14) Based on the above method, it can be formed that the airbag body also has: a first non-expansion portion among the multiple non-expansion portions that partially divides the connecting flow path and the expansion chamber as the expansion portion; a main body opening, which is supplied with inflation gas; and a second expansion chamber opening among the multiple openings that leads to the main body opening, and the second expansion chamber opening is partially divided by the first non-expansion portion, and the width of the second expansion chamber opening is greater than the width of the first expansion chamber opening.

[0040] By adopting this configuration, the inflation gas can flow more easily from the main body opening into the main chamber than when the width of the second inflation chamber orifice is smaller than the width of the first inflation chamber orifice. Therefore, the main chamber can be more easily expanded.

[0041] (15) Based on the above method, it can be formed that the main body opening is the innermost part of the flow path connecting the outside and the inside of the airbag body in the airbag body, and is divided by the non-expandable part on the outside of the airbag body, and the first non-expandable part has a shape in which the dimension along the width direction of the main body opening is larger than the dimension along the direction perpendicular to the width direction.

[0042] In this aspect, the inflation gas discharged from the main body opening flows in a direction perpendicular to the width direction of the main body opening. Therefore, the first non-expandable portion can reduce the load caused by the inflation gas by having a shape that is larger in the direction along the flow of the inflation gas.

[0043] (16) Based on the above method, it can be formed that the airbag main body also has other openings besides the first expansion chamber opening and the sub-chamber opening among the multiple openings, which serve as openings of the connecting flow path used as the expansion part, and the other openings lead to the main body opening.

[0044] By setting it in this way, the expansion gas for expansion of the sub-chamber is branched to flow to the first expansion chamber orifice as the opening of the main chamber and other orifices. That is, the amount of expansion gas passing through the main chamber is reduced, thereby reducing the pressure of the main chamber. Therefore, the load applied to the divided non-expansion portion is reduced, thereby reducing the stress generated in the divided non-expansion portion.

[0045] (17) On the basis of the above-mentioned method, it can be formed that the connecting flow path serving as the expansion part mitigates the impact on the protection object caused by the contact with the protection object, and the airbag main body also has: an additional sub-chamber, which adjusts the inflation method in the connecting flow path serving as the expansion part by receiving the inflation gas; a central orifice, which is arranged at a position relative to the main body opening, and discharges the inflation gas to the connecting flow path serving as the expansion part and the additional sub-chamber; and a second non-expansion part among the multiple non-expansion parts that partially divides the connecting flow path serving as the expansion part and the additional sub-chamber, the end of the second non-expansion part divides the narrowest part of the other orifices, and is arranged within the width of the central orifice when observed along the direction of the flow path of the inflation gas flowing through the central orifice.

[0046] By setting it in this way, the expansion gas flowing through the central orifice flows into the connecting flow path as the expansion part and the additional sub-chamber through the second non-expansion part. That is, the expansion gas becomes easy to flow into the expansion part other than the expansion part connected to the main chamber, thereby reducing the pressure of the main chamber. Therefore, the load applied to the divided non-expansion part is reduced, thereby reducing the stress generated in the divided non-expansion part.

[0047] (18) In the above aspect, the end portion of the second non-expandable portion may be formed in a convex shape toward the first non-expandable portion.

[0048] By setting it in this way, the expansion gas discharged from the central orifice becomes easy to flow into the additional auxiliary chamber along the end of the convex second non-expandable part. That is, the pressure of the main chamber is further reduced. Therefore, the load applied to the divided non-expandable part is reduced, thereby reducing the stress generated in the divided non-expandable part.

[0049] The technology of the present invention can be implemented in various forms other than the curtain airbag device, for example, in a method for manufacturing the curtain airbag device, a method for designing the curtain airbag device, a computer program for implementing the control method, a non-transitory recording medium for recording the computer program, and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is an explanatory diagram for showing the structure of a curtain airbag device 100 for a vehicle MV.

[0051] Figure 2 It is an explanatory diagram showing a cross section of the airbag body 110 in a folded state.

[0052] Figure 3 It is a top view showing the structure of the inner container 120.

[0053] Figure 4 This is an explanatory diagram for explaining the details of the internal structure of the airbag main body 110 .

[0054] Figure 5 It is an explanatory diagram for explaining the details of the structure of the first expansion chamber MC1, the first sub chamber SC1, and the second sub chamber SC2.

[0055] Figure 6 This is a photograph showing a state where the airbag body 110 has been inflated and deployed.

[0056] Figure 7 This is a photograph showing a state where inflation and deployment of the airbag body 110 have started and are just before completion.

[0057] Figure 8 It is an explanatory diagram for showing the structure of the curtain airbag device 100b according to the second embodiment.

[0058] Fig. 9 It is an explanatory diagram for showing the structure of a curtain airbag device 100c according to the third embodiment.

[0059] Fig.10 It is an explanatory diagram showing a curtain airbag device according to a fourth embodiment of the present invention in a vehicle.

[0060] Fig.11 It is an explanatory diagram showing an airbag main body.

[0061] Fig.12It is an enlarged view of the airbag body.

[0062] Fig.13 This is a photograph showing the curtain airbag device in a folded state.

[0063] Fig.14 This is a photograph showing the curtain airbag device in the middle of deployment.

[0064] Fig.15 This is a photograph showing the curtain airbag device in the middle of deployment.

[0065] Fig.16 This is a photograph showing a state where the airbag body has been completely inflated. DETAILED DESCRIPTION

[0066] A. First Implementation Method:

[0067] Figure 1 It is an explanatory diagram for showing the structure of a curtain airbag device 100 for a vehicle MV. Figure 1 The curtain airbag device 100 shown is a curtain airbag device 100 deployed along the right side wall of the vehicle MV. Figure 1 The curtain airbag device 100 shown has a substantially symmetrical structure and is deployed along the left side wall of the vehicle MV. Figure 1 , the internal structure of the curtain airbag device 100 is shown. Figure 1 , a rough shape of the vehicle MV is indicated by a dotted line.

[0068] exist Figure 1 In the figure, the arrow UD indicates the top, and the arrow DD indicates the bottom. The arrow FD indicates the front of the vehicle MV, and the arrow BD indicates the rear of the vehicle MV. The arrows UD, DD, FD, and BD shown in other figures are the same as those in FIG. Figure 1 The arrows UD, DD, FD, and BD correspond to each other. The up and down, front and back, and left and right mentioned in this specification refer to the up and down, front and back, and left and right of the vehicle MV as a moving body. In this specification, the up and down direction is indicated by the symbol "UD / DD". The front and back direction is indicated by the symbol "FD / BD".

[0069] Figure 1 The protection object PO1 shown is a passenger sitting in the front seat of the vehicle MV.

[0070] (Refer to Figure 1 (middle left and middle right). Figure 1The protection object PO2 shown is an occupant sitting in the rear seat of the vehicle MV. When an impact is applied to the vehicle MV, the curtain airbag device 100 is deployed from the roof of the vehicle MV along the side walls and windows of the vehicle MV. The protection objects PO1 and PO2 in the vehicle MV move relatively toward the side walls and windows of the vehicle MV due to the impact applied to the vehicle MV and their own inertia. The protection objects PO1 and PO2 do not collide directly with the side walls and windows, but collide with the deployed curtain airbag device 100. As a result, the impact that may be applied to the protection objects PO1 and PO2 is mitigated.

[0071] The curtain airbag device 100 includes an airbag body 110 , a liner 120 , and an inflator 130 .

[0072] Figure 2 FIG. 1 is an explanatory diagram showing a cross section of the airbag body 110 in a folded state. The airbag body 110 is supplied with inflation gas IG. Figure 2 The state shown is expanded (refer to Figure 1 Next, the shapes and positional relationships of the various parts of the airbag body 110 of the curtain airbag device 100 in the expanded state will be described.

[0073] The airbag body 110 is formed by overlapping and sewing two substantially rectangular pieces of cloth made of polyethylene terephthalate. Figure 1 In FIG. 1 , the stitched portion 112 is shown as the stitched portion 112 in the airbag body 110. Figure 1 In FIG. 1 , the sewn portion 112 that defines the outer edge of the portion where the inflation gas IG is introduced in the airbag body 110 is shown as the outer edge sewn portion 112o. The structure of the airbag body 110 will be described in detail later.

[0074] Figure 3 1 is a top view showing the structure of the bladder 120. The bladder 120 is supplied with inflation gas IG from the outside and supplies inflation gas IG into the airbag body 110 (see FIG. Figure 1 The inner liner 120 controls the flow of the inflation gas IG in the airbag body 110 during the supply of the inflation gas IG into the airbag body 110. The inner liner 120 has a tubular structure that branches into two branches. The front end of the branched tube in the inner liner 120 is arranged outside the airbag body 110 (refer to Figure 1 The other parts of the liner 120 are arranged in the airbag body 110.

[0075] The inner liner 120 is formed by overlapping and sewing two pieces of cloth made of polyethylene terephthalate. The inner liner 120 has a first expansion chamber opening 121, a second expansion chamber opening 122, a third expansion chamber opening 123, a first auxiliary chamber opening 126, and a connecting opening 129.

[0076] The connection opening 129 is located at the front end of the portion of the inner liner 120 disposed outside the airbag body 110 (see Figure 1 The connection opening 129 is located at the front end of one of the branched tubes in the liner 120. The connection opening 129 is connected to the inflator 130. Figure 1 In order to facilitate the understanding of the technology, the connection opening 129 and the inflator 130 are shown separately. The connection opening 129 receives the inflation gas IG supplied from the inflator 130 into the liner 120 (see Figure 1 The upper middle part and Figure 3 ).

[0077] The first expansion chamber opening 121, the second expansion chamber opening 122, the third expansion chamber opening 123, and the first auxiliary chamber opening 126 are located in a portion of the liner 120 disposed in the airbag body 110 (see Figure 3 The lower part and Figure 1 The first expansion chamber opening 121, the second expansion chamber opening 122, the third expansion chamber opening 123, and the first sub-chamber opening 126 discharge the expansion gas IG from the inner liner 120.

[0078] The second expansion chamber opening 122 is located at the front end of the inner container 120 and opens forward (see Figure 3 The second inflation chamber opening 122 discharges the inflation gas IG into the second inflation chamber MC2 of the airbag body 110 (see Figure 1 as well as Figure 3 The second expansion chamber MC2 of the airbag body 110 will be described in detail later.

[0079] The third expansion chamber opening 123 is located at the rear end of the inner container 120 and opens toward the rear (see Figure 3 The third expansion chamber opening 123 is located at the front end of the other branched tube in the inner liner 120. The third expansion chamber opening 123 discharges the inflation gas IG to the third inflation chamber MC3 of the airbag body 110 (see Figure 1 as well as Figure 3 The third expansion chamber MC3 of the airbag body 110 will be described in detail later.

[0080] The first expansion chamber opening 121 and the first sub-chamber opening 126 are located between the second expansion chamber opening 122 and the third expansion chamber opening 123 in the front-rear direction FD / BD, and both open downward (see Figure 3 The first expansion chamber opening 121 is located at a position further forward FD than the first auxiliary chamber opening 126. The first expansion chamber opening 121 is larger than the first auxiliary chamber opening 126.

[0081] The first inflation chamber opening 121 and the first sub-chamber opening 126 discharge the inflation gas IG to the connection chamber CC of the airbag body 110. Then, the inflation gas IG discharged from the first inflation chamber opening 121 mainly flows into the first inflation chamber MC1 (see Figure 1 as well as Figure 3 The expansion gas IG exhausted from the first sub chamber opening 126 flows mainly into the first sub chamber SC1 (see arrow Fm1). Figure 1 as well as Figure 3 The connection chamber CC, the first inflation chamber MC1, and the first sub-chamber SC1 of the airbag body 110 will be described in detail later.

[0082] The openings for discharging the inflation gas IG from the liner 120 are not limited to the first inflation chamber opening 121, the second inflation chamber opening 122, the third inflation chamber opening 123, and the first auxiliary chamber opening 126. As a result, the flow of the inflation gas IG from the liner 120 to the airbag body 110 is controlled (see Figure 1 Fm1~Fm3, Fs1).

[0083] The liner 120 has a first expansion chamber opening 121 and a first sub-chamber opening 126 for discharging the expansion gas IG to the outside of the expansion chambers MC2 and MC3, in addition to the second expansion chamber opening 122 and the third expansion chamber opening 123 for discharging the expansion gas IG to the expansion chambers MC2 and MC3. Therefore, it is possible to prevent a situation in which a large amount of expansion gas IG is supplied to the second expansion chamber MC2 and the third expansion chamber MC3 at an early stage after the supply of the expansion gas IG starts, the second expansion chamber MC2 and the third expansion chamber MC3 are greatly expanded, and the reaction force applied by the second expansion chamber MC2 and the third expansion chamber MC3 to the protected objects PO1 and PO2 is too large.

[0084] The inflator 130 is connected to the connection opening 129 of the bladder 120. The inflator 130 receives a signal from a control unit (not shown) and ejects the inflation gas IG. The inflation gas IG ejected from the inflator 130 causes the airbag body 110 to move from Figure 2 The state shown is expanded (refer to Figure 1 ).

[0085] Figure 4 This is an explanatory diagram for explaining the details of the internal structure of the airbag body 110. The airbag body 110 has a first expansion chamber MC1, a second expansion chamber MC2, a third expansion chamber MC3, a first sub-chamber SC1, a second sub-chamber SC2, and a connecting chamber CC. The airbag body 110 also has a first non-expandable portion 112A, a second non-expandable portion 112B, a third non-expandable portion 112C, a fourth non-expandable portion 112Sp, and a fifth non-expandable portion 112Tp.

[0086] The airbag body 110 also has a first orifice MO11, a second orifice SO11, a first expansion chamber orifice MO12, a second expansion chamber orifice MO2, a third expansion chamber orifice MO3, communication orifices CO1, CO2, a first sub-chamber orifice SO12 and a second sub-chamber orifice SO2.

[0087] In this specification, an "orifice" refers to a structure for controlling the flow of the inflation gas IG, and is a structure in which the cross-sectional area of ​​the flow path in the cross section perpendicular to the flow direction of the inflation gas IG is smaller than the cross-sectional area of ​​the space connected to the upstream and downstream of the structure. The orifice defines the relationship between the pressure difference between the upstream and downstream of the orifice, and the flow rate per unit time of the fluid flowing from the upstream of the orifice to the downstream of the orifice. The orifice is divided in the airbag body 110 by the sewing portion 112.

[0088] The first expansion chamber MC1 is expanded by the expansion gas IG, thereby alleviating the impact on the protected objects PO1 and PO2 in the vehicle MV (see Figure 4 The first expansion chamber MC1 is located closer to the pillar MVp2 of the vehicle MV than the second expansion chamber MC2 and the third expansion chamber MC3 in the front-rear direction FD / BD of the vehicle MV.

[0089] The pillar MVp2 of the vehicle MV supports the roof MVr of the vehicle MV and the door MVd2 for the rear seats of the vehicle MV (see Figure 1 The support column MVp2 of the vehicle MV also plays the role of absorbing the impact when the vehicle MV is hit from the side and preventing the internal space of the vehicle MV from shrinking. In order to achieve this role, the support column MVp2 is set to be thick. As a result, the support column MVp2 protrudes into the internal space of the vehicle MV. However, the surface of the support column MVp2 is covered with a resin component in the internal space of the vehicle MV. In order to facilitate the understanding of the technology, Figure 1 , a window MVw2 provided on a door MVd2 for rear seats of a vehicle MV, a door MVd1 for front seats of the vehicle MV, and a window MVw1 provided on the door MVd1 are shown (see FIG. Figure 1 ).

[0090] Since the first expansion chamber MC1 is disposed at the above position, the expansion mode of the first expansion chamber MC1 can be appropriately controlled to prevent the protected objects PO1 and PO2 in the vehicle MV from directly colliding with the pillar MVp2 protruding into the interior space of the vehicle MV.

[0091] The inflation gas IG supplied to the connection opening 129 of the liner 120 passes through the first inflation chamber opening 121 of the liner 120, and the first orifice MO11 and the first inflation chamber orifice MO12 to be supplied to the first inflation chamber MC1 (see Figure 4 Therefore, in the curtain airbag device 100, the first expansion chamber MC1 deployed near the pillar MVp2 can be expanded at an early stage compared to a method in which the first expansion chamber opening 121 and the first orifice MO11 opposite to the first expansion chamber opening 121 are not provided. Therefore, even when the protected objects PO1 and PO2 move relatively toward the pillar MVp2 due to the impact applied to the vehicle MV, the above-mentioned kinetic energy can be absorbed more reliably.

[0092] The second expansion chamber MC2 is expanded by the expansion gas IG, thereby alleviating the impact on the protection object PO1 in the vehicle MV (see Figure 4 The middle left part and Figure 1 The second expansion chamber MC2 is arranged on the front FD side relative to the first expansion chamber MC1. In addition, the second expansion chamber MC2 "is arranged on the front FD side relative to the first expansion chamber MC1" means that the front end of the second expansion chamber MC2 is further forward than the front end of the first expansion chamber MC1. Figure 1 In the curtain airbag device 100 shown, the second expansion chamber MC2 is located on the right side of the front seat of the vehicle MV.

[0093] The third expansion chamber MC3 is expanded by the expansion gas IG, thereby alleviating the impact on the protection object PO2 in the vehicle MV (see Figure 4 The middle right part and Figure 1 The third expansion chamber MC3 is arranged on the rear BD side relative to the first expansion chamber MC1. In addition, the third expansion chamber MC3 "is arranged on the rear BD side relative to the first expansion chamber MC1" means that the rear end of the third expansion chamber MC3 is further rearward than the rear end of the first expansion chamber MC1. Figure 1 In the curtain airbag device 100 shown, the third expansion chamber MC3 is located on the right side of the rear seat of the vehicle MV.

[0094] By forming such a structure, the sizes of the second expansion chamber opening 122 and the third expansion chamber opening 123 are adjusted based on the sizes of the first expansion chamber opening 121 and the first sub-chamber opening 126 of the inner liner 120, and the shapes of the first orifice MO11, the second orifice SO11, and the first sub-chamber SC1, to obtain the following effect. That is, the amount of expansion gas IG flowing into the first expansion chamber MC1, the amount of expansion gas IG flowing into the second expansion chamber MC2, the amount of expansion gas IG flowing into the third expansion chamber MC3, and the amount of expansion gas IG flowing into the first sub-chamber SC1 can be adjusted. As a result, the expansion modes of the first expansion chamber MC1, the second expansion chamber MC2, and the third expansion chamber MC3 can be appropriately controlled. In addition, the first orifice MO11, the second orifice SO11, and the first sub-chamber SC1 are described in detail later.

[0095] Regarding the airbag body 110, the expansion chambers MC2 and MC3 deployed beside the seat of the vehicle MV have outer edges divided by the sewn portion 112, and have one or two orifices as a portion connecting the inside and the outside. Therefore, by adjusting the shape of the outer edge of the expansion chamber and the shape of the orifice of the expansion chamber, the expansion mode of the expansion chamber can be adjusted as time passes from the start of supply of the inflation gas IG.

[0096] The first sub-chamber SC1 is a space provided for adjusting the expansion modes of the first expansion chamber MC1, the second expansion chamber MC2, and the third expansion chamber MC3 (see Figure 4 The first auxiliary chamber SC1 is arranged at the rear BD of the first expansion chamber MC1. The first auxiliary chamber SC1 receives the expansion gas IG. The first auxiliary chamber SC1 is connected to the first expansion chamber MC1. The first auxiliary chamber SC1 and the third expansion chamber MC3 are divided by a dividing portion 112T extending in the front-rear direction FD / BD in the sewing portion 112 (see Figure 4 middle right part of the image).

[0097] The first sub-chamber SC1 includes a first portion SC11, a second portion SC12, and a third portion SC13 (see Figure 4 The first portion SC11 is a portion of the first sub-chamber SC1 that extends from the position below DD of the inner liner 120 to the rear BD. The second portion SC12 is disposed at the lower DD of the first portion SC11. The second portion SC12 is a portion of the first sub-chamber SC1 that extends from the position below DD of the inner liner 120 to the rear BD. The third portion SC13 is a portion of the first sub-chamber SC1 that connects the rear end of the first portion SC11 and the rear end of the second portion SC12. The third portion SC13 is located at the rear BD of the first expansion chamber MC1.

[0098] By forming such a structure, the depth dimension of the first sub-chamber SC1 can be ensured, and the expansion mode of the first expansion chamber MC1 can be properly controlled for a long time, and the first sub-chamber SC1 can be used to support the protection objects PO1 and PO2 in the vehicle MV over a large range in the front-to-back directions FD / BD and the up-and-down directions UD / DD.

[0099] In the first sub-chamber SC1, the communication hole that communicates the inside of the first sub-chamber SC1 with the outside of the first sub-chamber SC1 is only the first sub-chamber orifice SO12 provided at the front end of the first portion SC11. By forming such a structure, the first portion SC11 is expanded earlier than the second portion SC12. As a result, the thickness of the airbag body 110 can be ensured at the central portion of the airbag body 110 at an early stage after the supply of the inflation gas IG starts. Therefore, the protection objects PO1 and PO2 in the vehicle MV can be effectively protected from impact.

[0100] Figure 5 The first expansion chamber MC1, the first auxiliary chamber SC1 and the second auxiliary chamber SC2 are explained in detail. The depth Ls1 of the first auxiliary chamber SC1 along the flow direction Ds1 of the expansion gas IG is larger than the width Ws11 of the second orifice SO11 (see FIG. Figure 5 The second orifice SO11 will be described later.

[0101] The second sub-chamber SC2 is a space provided for adjusting the expansion mode of the first expansion chamber MC1 (see Figure 4 The lower middle part and Figure 5 The second sub-chamber SC2 is arranged in the front FD of the first expansion chamber MC1. The second sub-chamber SC2 is connected to the first expansion chamber MC1. The second sub-chamber SC2 receives the expansion gas IG from the first expansion chamber MC1. Figure 1 and Figure 4 The arrow Fs2 indicates the flow of the expansion gas IG from the first expansion chamber MC1 to the second auxiliary chamber SC2. The second auxiliary chamber SC2 and the second expansion chamber MC2 are divided by a dividing portion 112S extending in the front-rear direction FD / BD in the sewing portion 112 (see FIG. Figure 4 The capacity of the second sub-chamber SC2 is smaller than the capacity of the first sub-chamber SC1.

[0102] The depth Ls2 of the second sub-chamber SC2 along the flow direction Ds2 of the expansion gas IG is greater than the width Ws2 of the second sub-chamber orifice SO2 (see Figure 5 The second sub-chamber orifice SO2 will be described later.

[0103] By forming the first sub-chamber SC1 and the second sub-chamber SC2 into such a structure, the expansion modes of the first expansion chamber MC1, the second expansion chamber MC2 and the third expansion chamber MC3 can be properly controlled for a longer time compared with a method in which the depth of each sub-chamber is smaller than the width of each sub-chamber orifice.

[0104] Regarding the airbag body 110, the sub-chambers SC1 and SC2 are divided into outer edges by the sewn portion 112, and have one orifice as a portion connecting the inside and the outside. Therefore, by adjusting the shape and size of the outer edge of the sub-chamber and the shape of the orifice of the sub-chamber, the expansion mode of the expansion chamber can be more appropriately adjusted as time passes from the start of supply of the inflation gas IG.

[0105] The connection chamber CC is surrounded by the first non-expandable portion 112A, the second non-expandable portion 112B, the third non-expandable portion 112C, and the fifth non-expandable portion 112Tp (see Figure 5 The connecting chamber CC is surrounded by the first orifice MO11, the first expansion chamber orifice MO12, the second orifice SO11 and the first sub-chamber orifice SO12.

[0106] The connection chamber CC allows the inflation gas IG to circulate in the airbag body 110. A portion of the inflation gas IG supplied to the connection opening 129 of the liner 120 flows into the first inflation chamber MC1 via the first orifice MO11, the connection chamber CC, and the first inflation chamber orifice MO12. A portion of the inflation gas IG supplied to the connection opening 129 of the liner 120 flows into the first sub-chamber SC1 via the second orifice SO11, the connection chamber CC, and the first sub-chamber orifice SO12.

[0107] exist Figure 5 In the figure, as the communication orifice CO2, there is shown an orifice connecting (i) the front FD portion surrounded by the third non-expansion portion 112C, the first orifice MO11, the first non-expansion portion 112A, and the first expansion chamber orifice MO12 in the connection chamber CC, and (ii) the rear BD portion surrounded by the third non-expansion portion 112C, the second orifice SO11, the fifth non-expansion portion 112Tp, the first sub-chamber orifice SO12, and the second non-expansion portion 112B. The communication orifice CO2 is divided by the third non-expansion portion 112C and the second non-expansion portion 112B.

[0108] The first non-expandable portion 112A, the second non-expandable portion 112B, the third non-expandable portion 112C, the fourth non-expandable portion 112Sp, and the fifth non-expandable portion 112Tp are all closed regions surrounded by the sewn portion 112 in the airbag body 110. The first non-expandable portion 112A, the second non-expandable portion 112B, the third non-expandable portion 112C, the fourth non-expandable portion 112Sp, and the fifth non-expandable portion 112Tp do not expand even if the inflation gas IG is supplied to the airbag body 110.

[0109] The first non-expandable portion 112A is disposed between the inner liner 120 and the second non-expandable portion 112B in the up-down direction UD / DD (see Figure 5 The first non-expandable portion 112A is disposed between the first expansion chamber opening 121 and the second expansion chamber opening 122 of the liner 120 in the front-rear direction FD / BD.

[0110] The second non-expandable portion 112B is disposed between the first portion SC11 and the second portion SC12 of the first sub chamber SC1 in the up-down direction UD / DD (see Figure 5 The second non-expandable portion 112B divides the first portion SC11 and the second portion SC12 of the first auxiliary chamber SC1. The second non-expandable portion 112B is disposed between the third portion SC13 of the first auxiliary chamber SC1 and the first expansion chamber MC1 in the front-rear direction FD / BD.

[0111] The third non-expandable portion 112C is disposed between the inner liner 120 and the second non-expandable portion 112B in the up-down direction UD / DD (see Figure 5 The third non-expandable portion 112C is arranged at the rear BD of the first non-expandable portion 112A in the front-to-back direction FD / BD. The third non-expandable portion 112C is arranged between the first expansion chamber opening 121 and the first auxiliary chamber opening 126 of the liner 120 in the front-to-back direction FD / BD.

[0112] The fourth non-expansion portion 112Sp is connected to the rear end of the partition portion 112S that partitions the second expansion chamber MC2 and the second sub-chamber SC2 (see Figure 5 The fifth non-expansion portion 112Tp is connected to the front end of the partition portion 112T that partitions the third expansion chamber MC3 and the first sub-chamber SC1 (see Figure 5 central part of the upper segment).

[0113] The first orifice MO11 is divided by the first non-expanded portion 112A and the third non-expanded portion 112C (see Figure 5 The expansion gas IG flowing into the first expansion chamber MC1 flows toward the first orifice MO11 (refer to Figure 4The first expansion chamber opening 121 of the inner liner 120 is arranged at a position opposite to the first orifice MO11.

[0114] A portion of the expansion gas IG introduced from the connection opening 129 flows through the inner liner 120 and into the first port MO11 (see Figure 4 Another part of the expansion gas IG introduced from the connection opening 129 flows into the second expansion chamber MC2 temporarily through the inner liner 120 (see arrow Fm1). Figure 4 Then, part of the expansion gas IG flows out from the second expansion chamber MC2 and flows through the inner liner 120 or the first orifice MO11 without passing through the inner liner 120 (refer to Figure 4 . ...

[0115] The second orifice SO11 is divided by the third non-expanded portion 112C and the fifth non-expanded portion 112Tp (see Figure 5 The expansion gas IG flowing into the first sub-chamber SC1 flows to the second port SO11 (see Figure 4 The first sub-chamber opening 126 of the inner container 120 is arranged at a position opposite to the second port SO11.

[0116] A portion of the inflation gas IG introduced from the connection opening 129 passes through the liner 120 and flows into the second port SO11 (see FIG. Figure 4 Another part of the inflation gas IG introduced from the connection opening 129 temporarily flows into the third inflation chamber MC3 through the inner liner 120 (see arrow Fs1). Figure 4 Then, part of the expansion gas IG flows out from the third expansion chamber MC3 and flows through the inner liner 120 or the second port SO11 without passing through the inner liner 120 (refer to Figure 4 denoted by arrow Fs1).

[0117] With regard to this structure, the following effects are obtained by adjusting the sizes of the first expansion chamber opening 121 and the first sub-chamber opening 126 of the liner 120, as well as the shapes of the first orifice MO11, the second orifice SO11, and the first sub-chamber SC1. That is, the amount of the expansion gas IG flowing into the first expansion chamber MC1 and the amount of the expansion gas IG flowing into the first sub-chamber SC1 can be appropriately adjusted as time passes from the start of the supply of the expansion gas IG. As a result, the expansion mode of the first expansion chamber MC1 can be appropriately controlled as time passes from the start of the supply of the expansion gas IG.

[0118] As described above, the depth Ls1 of the first sub chamber SC1 along the flow direction Ds1 of the expansion gas IG is larger than the width Ws11 of the second orifice SO11 (see Figure 5 In the present specification, "the width of the orifice" refers to the width of the smallest width portion in the flow path of the orifice. In the drawings of the present application, in order to facilitate the understanding of the technology, the width of each orifice is shown as a double-headed arrow drawn on the paper surface, not based on the 3D positions of two points on the inner wall of the orifice relative to the smallest width portion in the flow path of the orifice.

[0119] The first expansion chamber orifice MO12 is divided by the first non-expanded portion 112A and the second non-expanded portion 112B (see Figure 5 The first expansion chamber orifice MO12 is located on the opposite side of the connection opening 129 of the liner 120 relative to the first orifice MO11. The expansion gas IG flowing into the first expansion chamber MC1 flows to the first expansion chamber orifice MO12 (refer to Figure 4 The inflation gas IG flowing from the connection opening 129 into the liner 120 and the airbag body 110 passes through the first orifice MO11, and then passes through the first expansion chamber orifice MO12 and flows into the first expansion chamber MC1.

[0120] The width Wm11 of the first orifice MO11 is smaller than the width Wm12 of the first expansion chamber orifice MO12 (see Figure 5 Therefore, after the supply of the expansion gas IG starts, in the early stage, the shape and size of the first orifice MO11 dominate the inflow of gas into the first expansion chamber MC1 compared with the shape and size of the first expansion chamber orifice MO12.

[0121] The second expansion chamber opening MO2 is divided by the outer edge sewn portion 112o and the first non-expansion portion 112A (see Figure 4 The second expansion chamber orifice MO2 is located in front FD relative to the first orifice MO11 and the second orifice SO11. The expansion gas IG flowing into the second expansion chamber MC2 flows toward the second expansion chamber orifice MO2. The expansion gas IG flowing out of the second expansion chamber MC2 also flows toward the second expansion chamber orifice MO2. The expansion gas IG passing through the second expansion chamber orifice MO2 includes the expansion gas IG passing through the inner liner 120 and the expansion gas IG passing through the outside of the inner liner 120.

[0122] The third expansion chamber opening MO3 is divided by the outer edge sewn portion 112o and the fifth non-expansion portion 112Tp (see Figure 4The third expansion chamber orifice MO3 is located at the rear BD relative to the first orifice MO11 and the second orifice SO11. The expansion gas IG flowing into the third expansion chamber MC3 flows toward the third expansion chamber orifice MO3. The expansion gas IG flowing out of the third expansion chamber MC3 also flows toward the third expansion chamber orifice MO3. The expansion gas IG passing through the third expansion chamber orifice MO3 includes the expansion gas IG passing through the inner liner 120 and the expansion gas IG passing through the outside of the inner liner 120.

[0123] The tubular portion of the liner 120 provided with the connection opening 129 is formed to be inclined relative to the lower side DD in such a manner that the inflation gas IG is directed forward. With respect to the airbag body 110, the width of the third inflation chamber orifice MO3 is smaller than the width of the second inflation chamber orifice MO2. As a result, after the supply of the inflation gas IG starts, more inflation gas IG flows into the second inflation chamber MC2 than into the third inflation chamber MC3 at an early stage.

[0124] The communication port CO1 connects the first expansion chamber MC1 and the second expansion chamber MC2 (see Figure 4 The communication port CO1 is located at the rear BD relative to the second sub-chamber SC2. The expansion gas IG flowing from the second expansion chamber MC2 to the first expansion chamber MC1 flows through the communication port CO1.

[0125] The first auxiliary chamber orifice SO12 is divided by the fifth non-expanded portion 112Tp and the second non-expanded portion 112B (see Figure 5 The first auxiliary chamber orifice SO12 is located on the opposite side of the connection opening 129 of the liner 120 relative to the second orifice SO11. The expansion gas IG flowing into the first auxiliary chamber SC1 flows through the first auxiliary chamber orifice SO12 (refer to Figure 4 The inflation gas IG flowing from the connection opening 129 into the liner 120 and the airbag body 110 flows into the first sub-chamber SC1 through the first sub-chamber port SO12 after passing through the second port SO11.

[0126] The width Ws11 of the second orifice SO11 is smaller than the width Ws12 of the first auxiliary chamber orifice SO12 (see Figure 5 Therefore, after the supply of the expansion gas IG starts, in the early stage, the shape and size of the second orifice SO11 dominate the inflow amount of gas into the first sub-chamber SC1 compared with the shape and size of the first sub-chamber orifice SO12.

[0127] The second auxiliary chamber opening SO2 is divided by the outer edge sewn portion 112o and the fourth non-expanded portion 112Sp (see Figure 4The expansion gas IG flowing into the second auxiliary chamber SC2 flows toward the second auxiliary chamber orifice SO2 (refer to Figure 4 The second sub-chamber orifice SO2 is arranged on the opposite side of the first orifice MO11 relative to the communicating orifice CO1. That is, in the top view of the airbag body 110, with respect to the line segment defining the smallest width of the flow path of the communicating orifice CO1, when a straight line perpendicularly intersecting the line segment is defined at the midpoint of the line segment, the second sub-chamber orifice SO2 is located on one side of the straight line, and the first orifice MO11 is located on the other side.

[0128] The airbag body 110 has the communication port CO1, the second sub-chamber SC2, and the second sub-chamber port SO2 each having the above-described structure. Therefore, by adjusting the size and arrangement of the communication port CO1, the size and arrangement of the second sub-chamber SC2, and the size and arrangement of the second sub-chamber port SO2, at least the expansion modes of the first expansion chamber MC1 and the second expansion chamber MC2 can be controlled more appropriately.

[0129] Figure 6 This is a photograph showing a state where the airbag body 110 has been inflated and deployed. Figure 7 The photographs show the state at the start of inflation and deployment of the airbag body 110 and before the inflation and deployment are completed. Figure 6 and Figure 7 The curtain air bag device shown is Figure 1 to Figure 5 The curtain airbag device 100 shown is different, and is a curtain airbag device 100 deployed along the left side wall of the vehicle MV. Figure 6 and Figure 7 The curtain airbag apparatus shown is also referred to as a curtain airbag apparatus 100 .

[0130] exist Figure 6 and Figure 7 , a first expansion chamber MC1, a second expansion chamber MC2, a third expansion chamber MC3, a first sub-chamber SC1, and a second sub-chamber SC2 are shown. Figure 6 and Figure 7 , a probe Pim for impact evaluation is shown. The probe Pim is used to measure the distance from the reference position in the vehicle MV, the deployment time, the maximum load, the energy absorption amount, etc. for each impact point IP of the airbag body 110 (see Figure 1 IP address of the server).

[0131] according to Figure 7 It can be seen that the first expansion chamber MC1, the second expansion chamber MC2, and the third expansion chamber MC3 expand at an earlier stage than the first sub-chamber SC1 and the second sub-chamber SC2. Figure 7After the state shown, the excess inflation gas IG supplied to the first inflation chamber MC1, the second inflation chamber MC2, and the third inflation chamber MC3 moves to the first sub-chamber SC1 and the second sub-chamber SC2 through the respective orifices. As a result, the amount of inflation gas IG flowing into the first inflation chamber MC1, the amount of inflation gas IG flowing into the second inflation chamber MC2, and the amount of inflation gas IG flowing into the third inflation chamber MC3 are adjusted as time passes from the start of the supply of the inflation gas IG. The curtain airbag device 100 of the present embodiment is configured in such a manner that, as a result of the above-mentioned adjustment, the distance from the reference position in the vehicle MV, the deployment time, the maximum load, the energy absorption amount, etc., are made to be appropriate values ​​for each impact point IP of the airbag body 110.

[0132] As described above, in this embodiment, the following effects are obtained by adjusting at least the size of the first expansion chamber opening 121 of the inner liner 120, and the shapes of the first orifice MO11, the second orifice SO11, and the first sub-chamber SC1 (see Figure 4 That is, the amount of the expansion gas IG flowing into the first expansion chamber MC1 and the amount of the expansion gas IG flowing into the first sub-chamber SC1 can be adjusted as time passes from the start of the supply of the expansion gas IG. As a result, the expansion mode of the first expansion chamber MC1 can be appropriately controlled as time passes from the start of the supply of the expansion gas IG.

[0133] The vehicle MV of this embodiment is also referred to as a "mobile body". The second expansion chamber MC2 of the airbag body 110 is also referred to as a "main chamber" or a "front main chamber". The third expansion chamber MC3 of the airbag body 110 is also referred to as a "main chamber" or a "rear main chamber". The sewn portion 112 of the airbag body 110 is also referred to as a "joining portion".

[0134] B. Second Implementation Method:

[0135] Figure 8 This is an explanatory diagram for showing the structure of the curtain airbag device 100b of the second embodiment. The same reference numerals as those assigned to the respective structures of the curtain airbag device 100 are given to the same structures of the curtain airbag device 100 among the structures of the curtain airbag device 100b of the second embodiment. The same reference numerals as those assigned to the respective structures of the curtain airbag device 100 are given to the structures of the curtain airbag device 100 among the structures of the curtain airbag device 100b that are not the same as those of the curtain airbag device 100 but correspond to and achieve the same functions as those of the curtain airbag device 100 according to the following rules. That is, such structures are respectively given reference numerals with "b" added to the end of the reference numerals assigned to the respective structures of the curtain airbag device 100 (see Figure 1 and Figure 8 ).

[0136] The airbag body 110b of the curtain airbag device 100b includes a sixth non-expandable portion 112Up, a communication hole CO11b, a communication hole CO12b, and a partition portion 112U (see Figure 8 The curtain airbag device 100b further includes a first sub-chamber opening SO13. The other aspects of the curtain airbag device 100b are the same as those of the curtain airbag device 100.

[0137] The curtain airbag device 100b has a sixth non-expandable portion 112Up, a communication hole CO11b, and a communication hole CO12b at a position corresponding to the communication hole CO1 of the curtain airbag device 100. The communication hole CO12b, the sixth non-expandable portion 112Up, and the communication hole CO11b are arranged in order between the fourth non-expandable portion 112Sp and the first non-expandable portion 112A in a direction from the fourth non-expandable portion 112Sp toward the first non-expandable portion 112A.

[0138] The communication port CO11b connects the first expansion chamber MC1b and the second expansion chamber MC2 (see Figure 8 The communicating orifice CO12b connects the second expansion chamber MC2 with the second auxiliary chamber SC2 and the first auxiliary chamber SC1b (refer to Figure 8 the middle part of the ).

[0139] The sixth non-expandable portion 112Up is connected to the second non-expandable portion 112B by a partition portion 112U which is a part of the suture portion 112 (see Figure 8 The partition portion 112U partitions a portion of the outer edge of the first expansion chamber MC1b.

[0140] The first sub-chamber SC1b of the curtain airbag device 100b includes a first portion SC11, a second portion SC12, and a third portion SC13b (see Figure 8 The interior of the second portion SC12b of the first auxiliary chamber SC1b is connected to the exterior of the second portion SC12b via the first auxiliary chamber orifice SO13 (see Figure 8 the lower central part of the ).

[0141] Regarding the curtain airbag device 100b of the second embodiment, by adjusting at least the size of the first expansion chamber opening 121 of the inner liner 120, as well as the shapes of the first orifice MO11, the second orifice SO11 and the first sub-chamber SC1b, the expansion mode of the first expansion chamber MC1 can be appropriately controlled as time passes from the start of the supply of the inflation gas IG.

[0142] C. 3rd Implementation Method:

[0143] Fig. 9 This is an explanatory diagram for showing the structure of a curtain airbag device 100c of a third embodiment. For the structures of the curtain airbag device 100c of the third embodiment that are the same as the structures of the curtain airbag device 100 of the first embodiment, the same reference numerals as those assigned to the structures of the curtain airbag device 100 are respectively assigned. For the structures of the curtain airbag device 100c that are not the same as the structures of the curtain airbag device 100 but correspond to the structures of the curtain airbag device 100 and achieve the same functions, reference numerals are assigned according to the following rules. That is, such structures are respectively assigned reference numerals with "c" at the end of the reference numerals assigned to the structures of the curtain airbag device 100 (see Figure 1 and Fig. 9 ).

[0144] The curtain airbag device 100c includes an inner liner 120c instead of the inner liner 120. The other aspects of the curtain airbag device 100c are the same as those of the curtain airbag device 100.

[0145] The inner container 120c does not have the first auxiliary chamber opening 126 (see Figure 3 ). The inner liner 120c has a smaller dimension in the up-down direction UD / DD than the inner liner 120 (refer to Fig. 9 As a result, in the airbag body 110, the inflation gas IG can more easily flow from the second inflation chamber MC2 toward the third inflation chamber MC3 and from the third inflation chamber MC3 toward the second inflation chamber MC2 below the liner 120c.

[0146] In this embodiment, the amount of the expansion gas IG that flows temporarily into the third expansion chamber MC3 and then flows out of the third expansion chamber MC3 and flows through the second port SO11 without passing through the inner liner 120c is greater than that of the first embodiment (see Fig. 9 Similarly, the amount of expansion gas IG that temporarily flows into the second expansion chamber MC2 and then flows out of the second expansion chamber MC2 and flows through the first orifice MO11 without passing through the inner liner 120c is greater than that of the first embodiment (refer to Fig. 9 In order to facilitate the understanding of the technology, Fig. 9 , the flow of the inflation gas IG flowing from the second inflation chamber MC2 to the first inflation chamber MC1 is indicated by an arrow Fm6. The flow of the inflation gas IG flowing toward the first sub-chamber SC1 in the connecting chamber CC is indicated by an arrow Fm7. In the curtain airbag device 100 of the first embodiment and the curtain airbag device 100b of the second embodiment, this outflow of the inflation gas IG from the third inflation chamber MC3 and the second inflation chamber MC2 also occurs.

[0147] Regarding the curtain airbag device 100c of the third embodiment, by adjusting the size of the first expansion chamber opening 121 of the inner liner 120c, and the shapes of the first orifice MO11, the second orifice SO11, and the first sub-chamber SC1, the following effect is also obtained. That is, the amount of the inflation gas IG flowing into the first inflation chamber MC1 and the amount of the inflation gas IG flowing into the first sub-chamber SC1 can be adjusted as time passes from the start of the supply of the inflation gas IG. As a result, the inflation mode of the first inflation chamber MC1 can be appropriately controlled as time passes from the start of the supply of the inflation gas IG.

[0148] D. Other implementation methods:

[0149] D1. Other implementations 1-1:

[0150] (1) In the above embodiment, the airbag body 110 is formed by overlapping and sewing two substantially rectangular pieces of cloth made of polyethylene terephthalate (see Figure 1 ). However, the airbag body may be made of other materials as long as it is a sheet material with flexibility. In addition, the airbag body may be manufactured by methods other than suturing, such as bonding or welding. In addition, for example, a combination of bonding and suturing may be used simultaneously to manufacture the airbag body.

[0151] (2) In the above embodiment, the liner 120 is formed by overlapping and sewing two pieces of cloth made of polyethylene terephthalate (see Figure 1 and Figure 3 ). However, the liner may be made of other materials as long as it is a sheet material with flexibility. In addition, the liner may be made of the same material as the airbag body, or may be made of a material different from the airbag body. The liner may be manufactured by methods other than suturing, such as bonding or welding. In addition, for example, a combination of bonding and suturing may be used simultaneously to manufacture the liner.

[0152] (3) In the above embodiment, the tip end of the branched tube in the liner 120 is arranged outside the airbag body 110 (see Figure 1 However, the entire liner may be disposed within the airbag body 110.

[0153] (4) In the above embodiment, the first sub chamber SC1 is described as a structure provided for adjusting the expansion mode of the first expansion chamber MC1 (see Figure 4 However, the first auxiliary chamber may also have the function of adjusting the expansion mode of other expansion chambers.

[0154] (5) In the above-described embodiment, the first expansion chamber MC1 is described as a structure for alleviating the impact on the protected objects PO1 and PO2 in the vehicle MV by the expansion of the inflation gas IG (see Figure 4 However, the first expansion chamber may have a function of adjusting the expansion mode of other expansion chambers.

[0155] (6) In the above-mentioned embodiment, the expansion chambers MC2 and MC3 that are deployed beside the seat of the vehicle MV are divided at the outer edge by the sewing portion 112, and have one or two openings as a portion that communicates the inside and the outside (see Figure 4 ). With respect to the expansion chamber deployed beside the seat, the ratio of the length of the portion of the expansion chamber that is the orifice opening to the outer circumference length is preferably 20 to 35%, and more preferably 22 to 25%. With this structure, by adjusting the shape of the orifice of the expansion chamber, it is easy to adjust the expansion mode of the expansion chamber as time passes from the start of the supply of the inflation gas.

[0156] (7) In the above-mentioned embodiment, each of the sub-chambers SC1 and SC2 is divided at the outer edge by the sewing portion 112, and an orifice is provided as a portion for communicating the inside and the outside (see Figure 4 ). With respect to the auxiliary chamber, the ratio of the length of the portion of the auxiliary chamber that is the orifice opening to the outer circumference length is preferably 8 to 25%, and more preferably 10 to 20%. In this structure, by adjusting the shape of the orifice of the auxiliary chamber, it is easier to adjust the expansion mode of the expansion chamber as time passes from the start of the supply of the expansion gas.

[0157] (8) In the above-described embodiment, the pillars MVp2 of the vehicle MV support the roof MVr of the vehicle MV and the doors MVd2 for the rear seats of the vehicle MV (see Figure 1 The pillars of the moving body may support only the roof or only the doors. For example, the central pillar of a four-door vehicle does not support the doors but supports the roof. The pillars at the front of the doors of a convertible do not support the roof but support the doors.

[0158] (9) In the above embodiment, the technology of the present invention is described by taking the curtain airbag device for a vehicle MV as an example. However, the curtain airbag device can be applied to other mobile bodies such as ships, airplanes, and spacecraft.

[0159] D2. Other implementations 1-2:

[0160] In the first embodiment, the inner container 120 has a first sub-chamber opening 126 (see Figure 3However, as shown in the third embodiment, the inner container may be formed in a manner not to have the first auxiliary chamber opening (see Fig. 9 central part of the upper segment).

[0161] D3. Other implementations 1-3:

[0162] In the above embodiment, the airbag body 110 includes the second expansion chamber MC2 and the third expansion chamber MC3 (see Figure 4 ). However, the airbag body may be formed in a manner that does not have one or more of the above structures. In the above embodiment, the inner liner 120 has the second expansion chamber opening 122 and the third expansion chamber opening 123. However, the inner liner may be formed in a manner that does not have one or more of the above structures.

[0163] D4. Other embodiments 1-4:

[0164] In the first embodiment, the airbag body 110 has the second auxiliary chamber SC2, the connecting chamber CC, the first expansion chamber port MO12, the communicating ports CO1, CO2, the first auxiliary chamber port SO12 and the second auxiliary chamber port SO2 (see Figure 4 ). However, the airbag body may be formed in a manner that does not have one or more of the above-mentioned structures. For example, the second non-expandable portion 112B and the third non-expandable portion 112C may be integrated.

[0165] D5. Other embodiments 1-5:

[0166] In the above embodiment, the first expansion chamber MC1 is located closer to the pillar MVp2 of the vehicle MV in the front-rear direction FD / BD of the vehicle MV than the second expansion chamber MC2 and the third expansion chamber MC3 (see Figure 4 However, the first expansion chamber MC1 may be arranged at a position farther from the pillar MVp2 of the vehicle MV in the front-rear direction FD / BD of the vehicle MV than the second expansion chamber MC2 or the third expansion chamber MC3.

[0167] D6. Other embodiments 1-6:

[0168] In the above embodiment, the depth Ls1 of the first sub chamber SC1 along the flow direction Ds1 of the expansion gas IG is larger than the width Ws11 of the second orifice SO11 (see Figure 5 In the above embodiment, the depth Ls2 of the second auxiliary chamber SC2 along the flow direction Ds2 of the expansion gas IG is greater than the width Ws2 of the second auxiliary chamber orifice SO2 (refer to Figure 5However, the sub-chambers may be configured such that the depth of each sub-chamber is smaller than the width of the orifice of each sub-chamber.

[0169] D7. Other embodiments 1-7:

[0170] In the above-described embodiment, the first sub-chamber SC1 includes the first portion SC11, the second portion SC12, and the third portion SC13 (see Figure 4 The first portion SC11 is a portion of the first sub-chamber SC1 that extends rearward from a position below the inner liner 120. The second portion SC12 is a portion of the first sub-chamber SC1 that extends rearward from a position below the inner liner 120. The third portion SC13 is a portion of the first sub-chamber SC1 that connects the rear end of the first portion SC11 with the rear end of the second portion SC12. However, the first sub-chamber SC1 may be constructed in an approximately linear shape similar to the second sub-chamber SC2.

[0171] E. 4th implementation method:

[0172] E-1. Device composition:

[0173] Fig.10 1 is an explanatory diagram showing a curtain airbag device 100 in a vehicle MV. The curtain airbag device 100 in this embodiment is mounted on a vehicle MV, and protects a protection object PO when a collision occurs in the vehicle MV or when a collision is predicted. Fig.10 , the curtain airbag device 100 is shown when a side wall portion of a vehicle MV is viewed from inside the vehicle.

[0174] In addition, in the drawings and the following descriptions, the front FD indicates the front of the vehicle MV in the direction of travel, and the rear BD indicates the rear of the vehicle MV in the direction of travel. Also, the upper UD indicates the upper side in the height direction of the vehicle MV, and the lower DD indicates the lower side in the height direction of the vehicle MV. In this specification, one side of an object is sometimes indicated based on the direction of the drawings. For example, in the case of indicating the front FD, it is recorded as "the front side". On this basis, the direction along the front FD and the rear BD is called the front-to-back direction. The direction along the upper UD and the lower DD is called the up-down direction. The direction perpendicular to the front-to-back direction and the up-down direction is called the left-right direction. In addition, in Fig.10 In the figure, only the left side LD which is parallel to the left and right directions is shown.

[0175] The vehicle MV has two rows of seats. The vehicle MV has a first row on the front side and a second row on the rear side. In addition, the vehicle MV is provided with an A pillar MVp1, a B pillar MVp2, and a C pillar MVp3 on the side wall portion in the left-right direction. On this basis, the vehicle MV is provided with a front door MVd1 including a side window MVw1 on the front side between the A pillar MVp1 and the B pillar MVp2. The rear door MVd2 including a side window MVw2 on the rear side is provided between the B pillar MVp2 and the C pillar MVp3. In addition, in this specification, the scope of various pillars also includes a cover that covers a structural part of the vehicle MV.

[0176] The protection objects PO of this embodiment are the protection objects PO1 which are the passengers in the first row of the vehicle MV and the protection objects PO2 which are the passengers in the second row of the vehicle MV. Fig.10 As shown, the protected object PO is illustrated by a dotted line.

[0177] The curtain airbag device 100 includes an inflator 130, an inner liner 120, an airbag body 110, and a storage portion (not shown). In the curtain airbag device 100, the airbag body 110, the inner liner 120, and the inflator 130 are stored in a portion of the roof side MVr on the upper side of the side wall portion of the vehicle MV serving as the storage portion. The airbag body 110 and the inner liner 120 are stored in the storage portion in a folded state. When the curtain airbag device 100 is protecting the protected object PO, the airbag body 110, the inner liner 120, etc. are deployed from the storage portion toward the lower side DD. Specifically, the storage portion is as follows: Fig.10 As shown, the front side window MVw1 and the rear side window MVw2 are provided above a portion extending from a portion of the A pillar MVp1 to a portion of the C pillar MVp3 of the vehicle MV.

[0178] The inflator 130 injects inflation gas IG into the airbag body 110. More specifically, when a control unit (not shown) mounted on the vehicle MV detects or predicts the occurrence of a collision, it instructs the inflator 130 to inject inflation gas IG. The inflator 130 is disposed at Fig.10 The inflator 130 is inserted into the inner liner 120 described later.

[0179] Fig.111 is an explanatory diagram showing the airbag body 110. The inner liner 120 rectifies the flow of the inflation gas IG so that the inflation gas IG flows out into the airbag body 110. The inner liner 120 is arranged in the airbag body 110. The inner liner 120 is inserted with a part of the inflator 130, and receives the inflation gas IG inside. The inner liner 120 has a plurality of openings connected to various openings and various orifices of the airbag body 110. More specifically, the inner liner 120 has an opening 121 for the central main chamber, an opening 126 for the rear sub-chamber, an opening 122 for the front main chamber, and an opening 123 for the rear main chamber.

[0180] The opening 121 for the central main chamber is arranged at a position opposite to the first central orifice MO11, and discharges the inflation gas IG. The opening 126 for the rear sub-chamber is arranged at a position opposite to the second central orifice SO11, and discharges the inflation gas IG. The various orifices will be described later.

[0181] The opening 122 for the front main chamber discharges the expansion gas IG to the front main chamber MC2. That is, the opening 122 for the front main chamber is inserted into the second front main chamber orifice MO2. Therefore, the width of the opening 122 for the front main chamber is set based on the width Wc2 of the second front main chamber orifice MO2. The front main chamber MC2 and the second front main chamber orifice MO2 will be described later.

[0182] The opening 123 for the rear main chamber discharges the inflation gas IG to the rear main chamber MC3 described later. That is, the opening 123 for the rear main chamber is inserted into the opening of the rear main chamber MC3.

[0183] The airbag body 110 is inflated and deployed by being supplied with inflation gas IG. The airbag body 110 is a bag body made of, for example, polyamide woven fabric. The airbag body 110 has a plurality of non-inflatable portions 112, a plurality of main chambers, a plurality of sub-chambers, a plurality of orifices, a communication flow path MC1, and a body opening SP.

[0184] The main body opening SP supplies the inflation gas IG to the airbag main body 110. The main body opening SP is the innermost portion of the flow path connecting the outside and the inside of the airbag main body 110 in the airbag main body 110. The main body opening SP is divided by two peripheral non-expandable portions 112o which are the non-expandable portions 112 on the outside of the airbag main body 110. That is, the main body opening SP is as follows: Fig.11 1 and 2 , there is shown an insertion portion of the inflator 130 in the airbag body 110 and a connection portion of the airbag body 110. The body opening SP receives the inflation gas IG supplied from the inflator 130 into the airbag body 110.

[0185] In addition, in the following Fig.12, the figure shows the width direction Wd of the main body opening SP as a direction parallel to the straight line connecting the two peripheral non-expanded portions 112o, and the direction Vd perpendicular to the width direction Wd. The width direction Wd of the main body opening SP is a direction along the front-rear direction of the present embodiment, and the direction Vd perpendicular to the width direction Wd is also a direction along the up-down direction of the present embodiment.

[0186] The plurality of non-expandable portions 112 are portions where the fabrics constituting the airbag body 110 are joined. More specifically, the non-expandable portions 112 are joined portions formed by partially joining two pieces of fabric constituting the airbag by sewing. That is, the plurality of non-expandable portions 112 do not expand even when the inflation gas IG has entered the airbag body 110. Fig.11 As shown, the plurality of non-expandable portions 112 are not limited to portions along the outer circumference of the airbag body 110. The plurality of non-expandable portions 112 also include portions extending toward the inside of the airbag body 110 and portions formed in an island shape in the airbag body 110.

[0187] In the present embodiment, the plurality of non-expandable portions 112 include an outer peripheral non-expandable portion 112o, a first non-expandable portion 112A, a second non-expandable portion 112B, a third non-expandable portion 112C, a fourth non-expandable portion 112D, and a partitioned non-expandable portion 112S.

[0188] The outer peripheral non-expandable portion 112o defines the overall shape of the airbag body 110 when the outer peripheral non-expandable portion 112o expands due to receiving the inflation gas IG. Fig.13 1 , the non-expandable portion 112 is disposed at the outermost side of the airbag body 110. That is, the outer peripheral non-expandable portion 112o is a portion along the outer periphery of the airbag body 110.

[0189] The partitioned non-expansion portion 112S is divided into the front main chamber MC2 and the front sub chamber SC2. Fig.11 , the dividing non-expandable portion 112S is shown in the front side. The dividing non-expandable portion 112S is a non-expandable portion 112 extending from the lower side toward the inner side of the airbag body 110. More specifically, the dividing non-expandable portion 112S is set longer than the width Ws2 of the front sub-chamber opening SO2, thereby dividing the front main chamber MC2 and the front sub-chamber SC2. The dividing non-expandable portion 112S will be described in detail later.

[0190] Fig.12 112A is an enlarged view of the airbag body. The first non-expandable portion 112A partially divides the communication flow path MC1 and the front main chamber MC2 as the expansion portion. Fig.12In the figure, the first non-expandable portion 112A is shown near the center. The first non-expandable portion 112A is an island-shaped non-expandable portion 112 on the inner side of the airbag body 110. The first non-expandable portion 112A has a shape in which the dimension along the width direction Wd of the main body opening SP is larger than the dimension along the direction Vd perpendicular to the width direction Wd. That is, in the present embodiment, the first non-expandable portion 112A is set to be in the shape of a rectangle with the long side direction along the up-down direction. Therefore, the front side of the side along the long side direction of the first non-expandable portion 112A faces the front main chamber MC2. The lower side of the side along the short side direction of the first non-expandable portion 112A faces the connecting flow path MC1. The various main chambers and various sub-chambers will be described in detail later.

[0191] The first non-expandable portion 112A partially defines the first front main chamber orifice CO1, the second front main chamber orifice MO2, the central main chamber orifice MO12, and the first central orifice MO11. The definition of the orifices by the first non-expandable portion 112A will be described together with the orifices.

[0192] The second non-expansion portion 112B partially defines the communication flow path MC1 and the rear sub chamber SC1 as the expansion portion. Fig.11 , the second non-expandable portion 112B is shown near the center. The second non-expandable portion 112B is a non-expandable portion 112 extending inward from the outer peripheral non-expandable portion 112o on the lower side. In addition, the second non-expandable portion 112B partially divides the central main chamber orifice MO12, the rear orifice CO2, and the rear sub-chamber orifice SO12.

[0193] The end 112Ba of the second non-expanded portion 112B defines the narrowest portion of the central main chamber opening MO12. Fig.12 As shown in FIG. 1 , the end 112Ba of the second non-expandable portion 112B is arranged within the range of the width Wm1 of the first central orifice MO11 when viewed along the flow direction Fm1 of the expansion gas IG flowing through the first central orifice MO11. That is, the end 112Ba of the second non-expandable portion 112B is as shown in FIG. Fig.11 As shown, the first non-expandable portion 112A and the fourth non-expandable portion 112D are arranged in the front-rear direction.

[0194] The third non-expandable portion 112C defines the rear main chamber MC3 and the rear sub chamber SC1. Fig.11 , the third non-expandable portion 112C is shown at the rear side. The third non-expandable portion 112C is a non-expandable portion 112 extending inward from the outer peripheral non-expandable portion 112o at the rear side. The third non-expandable portion 112C partially defines the second central orifice SO11 and the rear auxiliary chamber orifice SO12.

[0195] The fourth non-expandable portion 112D partially defines a first central opening MO11, a second central opening SO11, and a rear opening CO2. Fig.11 , the fourth non-expandable portion 112D is shown in the center. The fourth non-expandable portion 112D is an island-shaped non-expandable portion 112 inside the airbag body 110. The fourth non-expandable portion 112D is surrounded by the body opening SP, the first non-expandable portion 112A, the second non-expandable portion 112B, and the third non-expandable portion 112C.

[0196] Regarding the plurality of main chambers, each main chamber is an expansion portion surrounded by one or more non-expansion portions 112 among the plurality of non-expansion portions 112. The plurality of main chambers include a front main chamber MC2, a central main chamber MC1, and a rear main chamber MC3. Each main chamber is expanded by being supplied with expansion gas IG, thereby relieving the impact on the protection object PO caused by contact with the protection object PO in the vehicle. In addition, the "front main chamber" is also referred to as an "expansion chamber".

[0197] The front main chamber MC2 is disposed on the front side of the vehicle MV to mitigate the impact on the protected object PO1 caused by contact with the protected object PO1 of the vehicle MV. Fig.11 As shown, the airbag body 110 is divided by the outermost non-expandable portion 112o, the first non-expandable portion 112A, and the partitioned non-expandable portion 112S. The openings in the front main chamber MC2 are the first front main chamber orifice CO1 and the second front main chamber orifice MO2 described later.

[0198] The front main chamber MC2 is set within a predetermined range based on, for example, the evaluation requirements of NCAP (New Car Assessment Program) and the specifications required by customers. That is, the range of the front main chamber MC2 is determined so as to ensure the thickness required in various requirements such as the requirements for release outside the vehicle and the requirements for evaluation of the impact test. In addition, the thickness of the front main chamber MC2 is the thickness generated by expansion in the left-right direction. In this specification, when the thickness of various main chambers and the thickness of various sub-chambers are mentioned, the same thickness is indicated.

[0199] The rear main chamber MC3 is disposed at the rear side of the vehicle MV to mitigate the impact on the protected object PO2 caused by contact with the protected object PO2 of the vehicle MV. Fig.11 As shown, the rear main chamber MC3 is divided by the outer peripheral non-expandable portion 112o and the third non-expandable portion 112C. The opening in the rear main chamber MC3 receives the opening 123 for the rear main chamber. The range of the rear main chamber MC3 is also determined in the same manner as the front main chamber MC2.

[0200] Central main chamber MC1 Fig.10As shown in FIG. 1 , the central main chamber MC1 is disposed at the position of the B pillar MVp2 in the front-rear direction. The central main chamber MC1 mitigates the impact on the protected object PO caused by the contact of the protected object PO including the protected object PO1 and the protected object PO2. Fig.11 As shown, the central main chamber MC1 is divided by the outer peripheral non-expandable portion 112o, the second non-expandable portion 112B, the partitioned non-expandable portion 112S, and the first non-expandable portion 112A. The range of the central main chamber MC1 is also determined in the same manner as the front main chamber MC2.

[0201] The connecting flow path MC1 connects the front main chamber MC2 and the front sub-chamber SC2. In the present embodiment, the central main chamber MC1 is configured to also function as the connecting flow path MC1. The connecting flow path MC1 is arranged on the rear side relative to the front main chamber MC2 and is configured to function as an expansion portion. That is, the connecting flow path MC1 as the expansion portion mitigates the impact on the protected object PO caused by the contact with the protected object PO.

[0202] The plurality of sub-chambers include the front sub-chamber SC2 and the rear sub-chamber SC1. The various sub-chambers adjust the expansion mode of the front main chamber MC2 by receiving the expansion gas IG. In addition, the "front sub-chamber" is also referred to as the "sub-chamber" and the "rear sub-chamber" is referred to as the "additional sub-chamber".

[0203] The front sub-chamber SC2 adjusts the expansion mode of the front main chamber MC2 and the central main chamber MC1. More specifically, when the pressure of the front main chamber MC2 and the central main chamber MC1 changes due to the deployment of the airbag body 110 and the contact with the protected object PO, the front sub-chamber SC2 receives the inflation gas IG from the front main chamber MC2 and the central main chamber MC1. That is, the front sub-chamber SC2 adjusts the pressure of the front main chamber MC2 and the central main chamber MC1. Therefore, when it acts on the contact with the protected object PO, the impact on the protected object PO in the front main chamber MC2 and the central main chamber MC1 is alleviated.

[0204] The front sub-chamber SC2 further mitigates the impact of the protected object PO in the front sub-chamber SC2 and prevents the protected object PO from being released to the outside of the vehicle. The front sub-chamber SC2 is set in a predetermined range together with the front main chamber MC2. As mentioned above, the front main chamber MC2 is determined to ensure the thickness required in various requirements. The front sub-chamber SC2 is determined to ensure the range required in various requirements. For example, the front sub-chamber SC2 is Fig.11 As shown, it is provided below the front main chamber MC2 so as to ensure the range A1 required by the requirements of NCAP between the front main chamber MC2 and the center main chamber MC1 in the front-rear direction.

[0205] Front sub-chamber SC2 Fig.11As shown, the front sub chamber SC2 is partitioned by the outer peripheral non-expandable portion 112o and the partition non-expandable portion 112S. That is, the front sub chamber SC2 is below the front main chamber MC2 and is separated from the front main chamber MC2 by the partition non-expandable portion 112S.

[0206] The front sub-chamber SC2 has one opening. The opening of the front sub-chamber SC2 is the front sub-chamber orifice SO2 described later, which leads to the connecting flow path MC1 that connects the front main chamber MC2 and the front sub-chamber SC2. In addition, the connecting flow path MC1 is also the central main chamber MC1. That is, the front sub-chamber SC2 expands by receiving the expansion gas IG from the front main chamber MC2 and the central main chamber MC1.

[0207] The rear sub-chamber SC1 adjusts the expansion mode in the rear main chamber MC3 and the connecting flow path MC1 as the expansion portion by receiving the inflation gas IG. More specifically, the rear sub-chamber SC1 receives the inflation gas IG from the rear main chamber MC3 and the central main chamber MC1 when the pressure of the rear main chamber MC3 and the central main chamber MC1 changes due to the deployment of the airbag body 110 and the contact with the protected object PO. That is, the rear sub-chamber SC1 adjusts the pressure of the rear main chamber MC3 and the central main chamber MC1. Therefore, when it acts on the contact with the protected object PO, the impact on the protected object PO in the rear main chamber MC3 and the central main chamber MC1 is mitigated.

[0208] The rear sub chamber SC1 further mitigates the impact of the protected object PO2, prevents the protected object PO2 from being released to the outside of the vehicle, etc. The rear sub chamber SC1 is provided in a predetermined range together with the rear main chamber MC3, similarly to the front sub chamber SC2.

[0209] The rear sub-chamber SC1 is divided by the outer peripheral non-expandable portion 112o, the second non-expandable portion 112B, and the third non-expandable portion 112C. The rear sub-chamber SC1 has only one opening. The opening of the rear sub-chamber SC1 is the rear sub-chamber orifice SO12 described later. The rear sub-chamber SC1 expands by receiving the expansion gas IG from the opening 126 for the rear sub-chamber.

[0210] The plurality of orifices allow the expansion gas IG received by the various main chambers or the various sub-chambers to flow. Fig.12 As shown, the front sub-chamber orifice SO2, the first front main chamber orifice CO1, the second front main chamber orifice MO2, the first central orifice MO11, the second central orifice SO11, the central main chamber orifice MO12, the rear orifice CO2 and the rear sub-chamber orifice SO12.

[0211] The second front main chamber opening MO2 leads to the main body opening SP among the plurality of openings.

[0212] More specifically, the second front main chamber orifice MO2, as the opening of the front main chamber MC2, receives the expansion gas IG supplied from the main body opening SP at a position closest to the main body opening SP. In addition, the "second front main chamber orifice" is also referred to as the "second expansion chamber orifice".

[0213] The second front main chamber opening MO2 is partially partitioned by the first non-expandable portion 112A.

[0214] More specifically, the second front main chamber opening MO2 is divided into a lower part by the first non-expanded portion 112A and an upper part by the outer peripheral non-expanded portion 112o. The width Wc2 of the second front main chamber opening MO2 represents the width of the narrowest part of the second front main chamber opening MO2.

[0215] The first front main chamber orifice CO1 functions as an opening of the communication flow path MC1 among the plurality of orifices. The first front main chamber orifice CO1 leads to the communication flow path MC1 as an opening of the front main chamber MC2. That is, the first front main chamber orifice CO1 allows the expansion gas IG to flow between the front main chamber MC2 and the central main chamber MC1. In addition, the "first front main chamber orifice" is also referred to as the "first expansion chamber orifice".

[0216] Furthermore, when the pressure of the front main chamber MC2 changes due to the contact between the front main chamber MC2 and the protected object PO1, the first front main chamber orifice CO1 opens to the communication flow path MC1 to flow the inflation gas IG of the front main chamber MC2 to the front sub chamber SC2.

[0217] The first front main chamber orifice CO1 is divided by the partitioning non-expandable portion 112S and the first non-expandable portion 112A. The first front main chamber orifice CO1 is divided into one on the lower side by the partitioning non-expandable portion 112S, and the other on the upper side by the first non-expandable portion 112A. The width of the narrowest part of the first front main chamber orifice CO1 is referred to as the width Wc1 of the first front main chamber orifice CO1.

[0218] The front auxiliary chamber orifice SO2 is configured to function as an opening of the front auxiliary chamber SC2. More specifically, the front auxiliary chamber orifice SO2 is provided in the airbag body 110 as an opening connecting the front auxiliary chamber SC2 and the central main chamber MC1. Therefore, the front auxiliary chamber orifice SO2 allows the inflation gas IG to flow to the front auxiliary chamber SC2 via the central main chamber MC1. In addition, the "front auxiliary chamber orifice" is also simply referred to as the "auxiliary chamber orifice".

[0219] The front sub-chamber orifice SO2 is partitioned by a partitioning non-expanded portion 112S and an outer peripheral non-expanded portion 112o described later. The width Ws2 of the front sub-chamber orifice SO2 is the width of the narrowest portion of the front sub-chamber orifice SO2.

[0220] Among the widths of various orifices, the width Wc1 of the first front main chamber orifice CO1 is larger than the width Ws2 of the front sub-chamber orifice SO2. More specifically, the cross-sectional area of ​​the flow path at the first front main chamber orifice CO1 is larger than the cross-sectional area of ​​the flow path at the front sub-chamber orifice SO2. By setting it in this way, the inflation gas IG of the front main chamber MC2 is more likely to flow out toward the front sub-chamber SC2, compared with the case where the width Wc1 of the first front main chamber orifice CO1 is smaller than the width Wc2 of the front sub-chamber orifice SO2. Therefore, the curtain airbag device 100 of the present invention can easily adjust the pressure of the front main chamber MC2, thereby being able to mitigate the impact.

[0221] Furthermore, among the widths of the various orifices, the width Wc2 of the second front main chamber orifice MO2 is greater than the width Wc1 of the first front main chamber orifice CO1. More specifically, the cross-sectional area of ​​the flow path at the second front main chamber orifice MO2 is greater than the cross-sectional area of ​​the flow path at the first front main chamber orifice CO1. By setting it in this way, the inflation gas IG flows more easily from the main body opening SP to the front main chamber MC2 than in the case where the width Wc2 of the second front main chamber orifice MO2 is smaller than the width Wc1 of the first front main chamber orifice CO1. Therefore, the front main chamber MC2 can be deployed more easily.

[0222] The first central orifice MO11 is arranged at a position opposite to the main body opening SP, and discharges the expansion gas IG from the main body opening SP toward the central main chamber MC1 and the rear sub-chamber SC1. Furthermore, the first central orifice MO11 also functions as a flow path for the expansion gas IG that circulates through contact with the protected object PO between the central main chamber MC1, the front main chamber MC2, etc. The first central orifice MO11 is divided by the first non-expansion portion 112A and the fourth non-expansion portion 112D. In addition, the "first central orifice" is also referred to as the "central orifice".

[0223] The second central orifice SO11 is arranged at a position opposite to the main body opening SP, and discharges the inflation gas IG from the main body opening SP toward the rear sub-chamber SC1. Furthermore, the first central orifice MO11 also functions as a flow path for the inflation gas IG that circulates through contact with the protected object PO between the rear main chamber MC3 and the rear sub-chamber SC1. The second central orifice SO11 is divided by the fourth non-expansion portion 112D and the third non-expansion portion 112C.

[0224] The rear orifice CO2 discharges the inflation gas IG from the main body opening SP toward the rear. The rear orifice CO2 is arranged between the first central orifice MO11 and the second central orifice SO11 in the front-to-back direction. The rear orifice CO2 is divided by the fourth non-expandable portion 112D and the second non-expandable portion 112B. As described above, the end 112Ba of the second non-expandable portion 112B is arranged between the first non-expandable portion 112A and the fourth non-expandable portion 112D in the front-to-back direction. That is, the end 112Ba of the second non-expandable portion 112B is also between the first non-expandable portion 112A and the third non-expandable portion 112C. The portion of the second non-expandable portion 112B that divides the rear orifice CO2 is further rearward than the end 112Ba of the second non-expandable portion 112B in the front-to-back direction, and the rear orifice CO2 is partially divided.

[0225] The central main chamber orifice MO12 is an opening of the connecting flow path MC1 used as the expansion portion, and is an orifice other than the first front main chamber orifice CO1 and the front sub-chamber orifice SO2. The central main chamber orifice MO12 is provided so as to lead to the main body opening SP. The central main chamber orifice MO12 is divided by the end portions 112Ba of the first non-expansion portion 112A and the second non-expansion portion 112B. That is, the central main chamber orifice MO12 receives the expansion gas IG supplied from the main body opening SP to the central main chamber MC1 via the first central orifice MO11. In addition, the "central main chamber orifice" is also referred to as "other orifices".

[0226] The central main chamber orifice MO12 is also provided to communicate with the rear orifice CO2. Therefore, the central main chamber orifice MO12 also functions as a flow path for the inflation gas IG to flow through contact with the protected object PO between the central main chamber MC1 and the rear sub-chamber SC1.

[0227] The rear sub-chamber orifice SO12 is connected to the rear orifice CO2 and the second central orifice SO11 as an opening of the rear sub-chamber SC1. That is, the rear sub-chamber orifice SO12 receives the inflation gas IG supplied from the main body opening SP to the rear sub-chamber SC1 via the rear orifice CO2 and the second central orifice SO11. Furthermore, the rear sub-chamber orifice SO12 also functions as a flow path for the inflation gas IG that circulates through contact with the protected object PO between the central main chamber MC1 and the rear sub-chamber SC1.

[0228] E-2. Structure of the non-expansion part:

[0229] As described above, the partitioned non-expandable portion 112S partitions the front main chamber MC2 and the front sub-chamber SC2. The partitioned non-expandable portion 112S has a front end portion 112Sb, a central portion 112Sc, and a rear end portion 112Sa. Fig.12As shown, the dividing non-expandable portion 112S is below the front main chamber MC2, and the front main chamber MC2 and the front sub-chamber SC2 are divided by the central portion 112Sc extending in the front-to-back direction. In the dividing non-expandable portion 112S, the front end 112Sb and the rear end 112Sa extend from the central portion 112Sc toward the outside of the airbag body 110. In addition, the "rear end" is also referred to as the "end dividing the non-expandable portion".

[0230] The front end 112Sb is connected to the lower peripheral non-expandable portion 112o in the airbag body 110. The front end 112Sb is convex toward the front FD. That is, the non-expandable portion 112S is formed in an arc shape from the lower peripheral non-expandable portion 112o toward the rear side. By setting it in this way, the front end 112Sb does not have a corner, so compared with the method with a corner, when a load is applied due to expansion, it is not easy to cause stress concentration.

[0231] As described above, the central portion 112Sc extends in the front-to-rear direction as a connecting portion between the front end portion 112Sb and the rear end portion 112Sa. The length L1 of the central portion 112Sc is also the length of the partitioning non-expansion portion 112S. As described above, the partitioning non-expansion portion 112S is divided into the front main chamber MC2 and the front sub-chamber SC2 by being set longer than the width Ws2 of the front sub-chamber orifice SO2. That is, with respect to the partitioning non-expansion portion 112S, the length L1 of the central portion 112Sc is greater than the width Ws2 of the front sub-chamber orifice SO2.

[0232] By setting it in this way, the force received by the divided non-expandable portion 112S when the airbag body 110 is deployed can be entirely borne by the divided non-expandable portion 112S which is set longer than the width Ws2 of the front sub-chamber opening SO2. Therefore, compared with a method in which the divided non-expandable portion 112S is shorter than the width Ws2 of the front sub-chamber opening SO2, for example, a method in which the front main chamber MC2 and the front sub-chamber SC2 are divided by a plurality of non-expandable portions 112 in a dot-like or island-like shape, stress concentration is less likely to occur in the divided non-expandable portion 112S.

[0233] The rear end portion 112Sa is arranged on the opening side of the front sub-chamber SC2, and partially divides the rear sub-chamber orifice SO12. The rear end portion 112Sa has a branch portion 112Sa1 and an arc-shaped portion 112Sa2. The branch portion 112Sa1 branches into two branches in the rear end portion 112Sa. The arc-shaped portion 112Sa2 connects the respective front ends of the branch portion 112Sa1 in an arc shape. That is, the shape of the rear end portion 112Sa is annular.

[0234] By setting it in this manner, compared with a method in which the end 112Sa dividing the non-expansion portion 112S does not have a closed portion formed by the arc portion 112Sa2 and the branch portion 112Sa1, stress concentration is less likely to occur at the end 112Sa dividing the non-expansion portion 112S when a load is applied due to expansion.

[0235] E-3. Deployment and inflation of the airbag body:

[0236] Fig.13 2 is a photograph showing the curtain airbag device 100 in a folded state. Fig.13 In FIG. 1 , the airbag body 110, the liner 120 and the inflator 130 are shown to be stored in Fig.10 That is, the airbag body 110 and the liner 120 are in a folded state. Fig.13 , an impactor IM used for the impact test to simulate the protection object PO1 is shown.

[0237] also, Figure 13 to Figure 16 The airbag body 110 is relative to Figure 10 to Figure 12 In order to facilitate the understanding of the technology, the components that are not exposed to the outside are shown by dotted lines.

[0238] Fig.14 1 is a photograph showing the curtain airbag device 100 in the middle of deployment. If the curtain airbag device 100 detects or predicts the occurrence of a collision, the inflator 130 will spray the inflation gas IG. The airbag body 110 and the liner 120 begin to inflate by receiving the inflation gas IG, thereby deploying the airbag body 110 and the liner 120 from the folded state. Fig.14 , the airbag body 110 is partially deployed by supplying inflation gas IG to a portion of the airbag body 110.

[0239] like Fig.14 As shown, the airbag body 110 first expands from various main chambers such as the front main chamber MC2 and the central main chamber MC1. As for the front sub-chamber SC2, by designing the width Ws2 of the rear sub-chamber orifice SO12 to be small, the inflation gas IG is not easy to flow into the various main chambers such as the front main chamber MC2 and the central main chamber MC1 until a certain pressure is reached.

[0240] Fig.15 1 is a photograph showing the curtain airbag device 100 in the middle of deployment. Fig.15, the expansion of the front sub-chamber SC2 is shown in the middle. By filling the front main chamber MC2 and the central main chamber MC1 with the expansion gas IG and reaching a certain pressure, the expansion gas IG becomes easy to flow from the front main chamber MC2 and the central main chamber MC1 toward the front sub-chamber SC2. Therefore, the front sub-chamber SC2 expands lagging behind the front main chamber MC2 and the central main chamber MC1.

[0241] like Fig.15 As shown, the front main chamber MC2 is divided by the non-expansion portion 112S and expands. Therefore, in the divided non-expansion portion 112S, a load is applied due to the expansion of the front main chamber MC2, thereby generating stress. As described above, the central portion 112Sc and the front side end portion 112Sb that divide the non-expansion portion 112S face the front main chamber MC2. Therefore, specifically, stress is generated in the central portion 112Sc and the front side end portion 112Sb. In the central portion 112Sc, by setting the length L1 of the central portion 112Sc to be longer than the width Ws2 of the front sub-chamber orifice SO2, stress concentration is not easily generated. In the front side end portion 112Sb, stress concentration is also not easily generated due to the arc-shaped setting.

[0242] Fig.16 This is a photograph showing the state in which the airbag body 110 has been inflated. In the non-inflatable portion 112S, a load is applied due to the expansion of the central main chamber MC1, so that stress is generated at the rear end 112Sa facing the central main chamber MC1. However, compared with a method in which the rear end 112Sa does not have a closed portion formed by the arc-shaped portion 112Sa2 and the branch portion 112Sa1, stress concentration is less likely to occur at the end 112Sa of the non-inflatable portion 112S.

[0243] According to the above, by setting it in this way, the force received by the divided non-expandable portion 112S when the airbag body 110 is deployed can be entirely borne by the divided non-expandable portion 112S set longer than the width Ws2 of the front sub-chamber opening SO2. Therefore, compared with a method in which the divided non-expandable portion 112S is shorter than the width Ws2 of the front sub-chamber opening SO2, for example, a method in which the front main chamber MC2 and the front sub-chamber SC2 are divided by a plurality of non-expandable portions 112 in a dot-like or island-like shape, stress concentration is less likely to occur in the divided non-expandable portion 112S.

[0244] Furthermore, compared with a configuration in which the end portion 112Sa defining the non-expanded portion 112S does not have a closed portion formed by the arc-shaped portion 112Sa2 and the branch portion 112Sa1, stress concentration is less likely to occur at the end portion 112Sa defining the non-expanded portion 112S.

[0245] On this basis, by providing the front sub-chamber SC2 with one opening, the amount of inflation gas IG that can flow into the front sub-chamber SC2 is limited to the size of the front sub-chamber SC2. That is, the amount of inflation gas IG that flows out of the front main chamber MC2 is also limited. Therefore, the curtain airbag device 100 of the present invention can easily adjust the internal pressure of the front main chamber MC2 by adjusting the size of the front sub-chamber SC2. Therefore, the curtain airbag device 100 of the present invention can more effectively mitigate the impact on the protected object PO.

[0246] Furthermore, by making the communication flow path MC1 function as an expansion unit, the volume of the communication flow path MC1 becomes larger than that of the communication flow path MC1 functioning only as a flow path for the inflation gas IG. That is, the flow of the inflation gas IG between the front main chamber MC2 and the front sub-chamber SC2 becomes gentle. Therefore, the curtain airbag device 100 of the present invention can mitigate the impact on the protection object PO by mitigating the pressure change of the front main chamber MC2 caused by the contact of the protection object PO.

[0247] On this basis, regarding the various orifices in the front main chamber MC2, the inflation gas IG in the front main chamber MC2 is more likely to flow out toward the front sub chamber SC2 than when the width Wc1 of the first front main chamber orifice CO1 is smaller than the width Ws2 of the front sub chamber orifice SO2. Therefore, the curtain airbag device 100 of the present invention can mitigate the impact by easily adjusting the pressure of the front main chamber MC2.

[0248] Furthermore, compared with the case where the width Wc2 of the second front main chamber orifice MO2 is smaller than the width Wc1 of the first front main chamber orifice CO1, the inflation gas IG flows more easily from the body opening SP into the front main chamber MC2. Therefore, the front main chamber MC2 can be more easily expanded.

[0249] On this basis, in the first non-expandable portion 112A, the expansion gas IG discharged from the main body opening SP flows in a direction Vd perpendicular to the width direction Wd of the main body opening SP. Therefore, the first non-expandable portion 112A can reduce the load caused by the expansion gas IG by having a shape that is larger in the direction along the flow of the expansion gas IG.

[0250] Furthermore, by setting it in this way, the expansion gas IG expanded by the front sub-chamber SC2 is branched and flows to the first front main chamber orifice CO1 and the central main chamber orifice MO12 which are the openings of the front main chamber MC2. That is, by reducing the amount of the expansion gas IG passing through the front main chamber MC2, the pressure of the front main chamber MC2 is reduced. Therefore, by reducing the load applied to the partitioned non-expansion portion 112S, the stress generated in the partitioned non-expansion portion 112S is reduced.

[0251] On this basis, by setting it in this way, the expansion gas IG flowing in the first central orifice MO11 flows into the communication flow path MC1 and the rear sub-chamber SC1 as the expansion part through the second non-expansion part 112B. That is, the expansion gas IG becomes easy to flow into the expansion part other than the expansion part connected to the front main chamber MC2, thereby reducing the pressure of the front main chamber MC2. Therefore, the load applied to the partitioned non-expansion part 112S is reduced, thereby reducing the stress generated in the partitioned non-expansion part 112S.

[0252] F. Other implementations:

[0253] F1. Other implementations 2-1:

[0254] In the above-mentioned embodiment, the end 112Ba of the second non-expansion portion 112B can be formed into a convex shape toward the first non-expansion portion 112A. More specifically, the end 112Ba of the second non-expansion portion 112B can be in a state of protruding at an inner angle less than 90 degrees. By setting it in this way, the expansion gas IG discharged from the first central orifice MO11 becomes easy to flow into the rear sub-chamber SC1 along the convex end 112Ba of the second non-expansion portion 112B. That is, the pressure of the front main chamber MC2 is further reduced. Therefore, by reducing the load applied to the partitioned non-expansion portion 112S, the stress generated in the partitioned non-expansion portion 112S is reduced.

[0255] F2. Other implementations 2-2:

[0256] (1) In the above embodiment, the curtain airbag device 100 is mounted on a vehicle MV. However, the curtain airbag device 100 may be mounted on a mobile object other than a vehicle MV. For example, the curtain airbag device 100 may be used in a mobile object such as an airplane or a ship and mounted on a mobile object other than a vehicle MV.

[0257] (2) In the above embodiment, the expansion parts of the various main chambers, various sub-chambers, etc. are surrounded by a plurality of non-expandable parts 112. However, the expansion part may be surrounded by a single non-expandable part 112. For example, the expansion part may be formed by being surrounded by a single arc-shaped non-expandable part 112 on the inner side of the airbag body 110.

[0258] (3) In the above-mentioned embodiment, the airbag body 110 has one connecting flow path MC1 that connects the front main chamber MC2 and the front sub-chamber SC2. However, the airbag body 110 may have a plurality of connecting flow paths MC1. Furthermore, the connecting flow path MC1 may not function as an expansion portion like the central main chamber MC1. For example, the front side end 112Sb that divides the non-expansion portion 112S may not be connected to the peripheral non-expansion portion 112o, so that the front main chamber MC2 and the front sub-chamber SC2 are connected without passing through the expansion portion. That is, the front sub-chamber may have two openings. More specifically, the airbag body 110 may be provided with two front sub-chamber orifices that function as openings of the front sub-chamber SC2, each of which functions as a connecting flow path MC1.

[0259] (4) In the above embodiment, the partitioned non-expandable portion 112S may not have the arcuate portion 112Sa2 and the branch portion 112Sa1 at the rear end portion 112Sa. For example, the rear end portion 112Sa may be a single non-expandable portion 112 curved in an arc shape.

[0260] (5) In the above embodiment, the width Wc1 of the first front main chamber opening CO1 is larger than the width Ws2 of the front sub-chamber opening SO2. However, the width Wc1 of the first front main chamber opening CO1 may not be larger than the width Ws2 of the front sub-chamber opening SO2. For example, the width Wc1 of the first front main chamber opening CO1 may be the same as the width Ws2 of the front sub-chamber opening SO2.

[0261] (6) In the above embodiment, the width Wc2 of the second front main chamber opening MO2 is larger than the width Wc1 of the first front main chamber opening CO1. However, the width Wc2 of the second front main chamber opening MO2 may not be larger than the width Wc1 of the first front main chamber opening CO1. For example, the width Wc2 of the second front main chamber opening MO2 may be the same as the width Wc1 of the first front main chamber opening CO1.

[0262] (7) In the above embodiment, the first non-expanded portion 112A has a shape in which the dimension along the width direction Wd of the main body opening SP is larger than the dimension along the direction Vd perpendicular to the width direction Wd. However, the first non-expanded portion 112A may have a shape in which the dimension along the width direction Wd of the main body opening SP is smaller than the dimension along the direction Vd perpendicular to the width direction Wd.

[0263] (8) In the above embodiment, the airbag body 110 has the central main chamber orifice MO12 as the opening of the central main chamber MC1. However, the airbag body 110 may not have the central main chamber orifice MO12. That is, the airbag body 110 may have only the front sub-chamber orifice SO2 and the first front main chamber orifice CO1 as the opening of the central main chamber MC1.

[0264] (9) In the above embodiment, the airbag body 110 may not have the rear main chamber MC3 and the rear sub-chamber SC1. For example, the airbag body 110 may have only the front main chamber MC2 and the front sub-chamber SC2. More specifically, the curtain airbag device 100 is mounted on a vehicle MV having only one row of seats and only protects the protected object PO1, so that the airbag body 110 has only the front main chamber MC2 and the front sub-chamber SC2.

[0265] (10) In the above embodiment, the airbag body 110 may not have the second central opening SO11. For example, the end of the third non-expandable portion 112C of the airbag body 110 may be disposed at the position of the fourth non-expandable portion 112D, thereby allowing the rear auxiliary chamber opening SO12 to function as the rear opening CO2.

[0266] The technology of the present invention is not limited to the above-mentioned embodiments, and can be implemented in various structures within the scope of the main purpose. For example, in order to solve part or all of the above-mentioned problems, or to achieve part or all of the above-mentioned effects, the technical features of the embodiments corresponding to the technical features in each mode recorded in the summary column of the present invention can be appropriately replaced or combined. In addition, if the technical feature is not described as an indispensable technical feature in this specification, it can be appropriately deleted.

Claims

1. A curtain airbag device, which is a curtain airbag device for a mobile body, wherein: The curtain airbag device comprises: an airbag main body that is inflated and deployed by being supplied with inflation gas; and The inner liner, at least a part of which is disposed in the airbag body, is supplied with inflation gas from the outside to control the flow of the inflation gas into the airbag body. The airbag body comprises: a first expansion chamber that is expanded by the expansion gas, thereby alleviating the impact on the protection object in the moving body; a first orifice for allowing the expansion gas flowing into the first expansion chamber to flow; a first sub-chamber provided for adjusting the expansion mode of the first expansion chamber and receiving the expansion gas; and a second orifice for allowing the expansion gas flowing into the first auxiliary chamber to flow, The liner has a first expansion chamber opening that is disposed at a position facing the first port and discharges the inflation gas.

2. The curtain airbag device according to claim 1, wherein: The liner further includes a first auxiliary chamber opening disposed at a position facing the second port and configured to discharge the inflation gas.

3. The curtain airbag device according to claim 2, wherein: The airbag body also has: a second expansion chamber which is expanded by the expansion gas to mitigate the impact on the protection object in the moving body and is arranged on the front side with respect to the first expansion chamber; and a third expansion chamber which is expanded by the expansion gas to mitigate the impact on the protection object in the moving body and is arranged at the rear side relative to the first expansion chamber, The liner also has: The second expansion chamber is open and discharges the expansion gas into the second expansion chamber; and The third expansion chamber is open and discharges the expansion gas into the third expansion chamber.

4. The curtain airbag device according to claim 3, wherein: The airbag body also has: a communication orifice connecting the first expansion chamber and the second expansion chamber; a second auxiliary chamber, which receives the expansion gas and is connected to the first expansion chamber and has a smaller capacity than the first auxiliary chamber; as well as The second auxiliary chamber orifice allows the expansion gas flowing into the second auxiliary chamber to flow therethrough, and is disposed on the opposite side of the first orifice with respect to the communication orifice.

5. The curtain airbag device according to claim 4, wherein: The first expansion chamber is located closer to a pillar supporting at least one of a roof of the mobile body and a door of the mobile body than the second expansion chamber and the third expansion chamber in the front-rear direction of the mobile body.

6. The curtain airbag device according to claim 4, wherein: The depth of the first auxiliary chamber along the flow direction of the expansion gas is greater than the width of the second orifice. The depth of the second auxiliary chamber along the flow direction of the expansion gas is greater than the width of the orifice of the second auxiliary chamber.

7. The curtain airbag device according to claim 2, wherein: The depth of the first sub-chamber along the flow direction of the expansion gas is greater than the width of the second orifice.

8. The curtain airbag device according to claim 6 or 7, wherein: The first sub-chamber has: A first portion extending rearward from a position below the inner container; The second part is arranged below the first part and extends rearward from the bottom of the inner container; as well as Part 3 connects the rear end of the part 1 and the rear end of the part 2.

9. A curtain airbag device, which is a curtain airbag device for a mobile body, wherein: The curtain airbag device includes an airbag body which is inflated and deployed by being supplied with inflation gas. The airbag body comprises: a plurality of non-expandable portions as portions joined to the fabric constituting the airbag body; an expansion chamber and a sub-chamber as an expansion portion respectively surrounded by one or more non-expandable portions among the plurality of non-expandable portions; a plurality of orifices for communicating expansion gas received by the expansion chamber or the sub-chamber; and one or more communication channels connecting the expansion chamber and the auxiliary chamber, The expansion chamber is expanded by being supplied with an inflation gas, thereby alleviating an impact on the protection object caused by contact with the protection object in the moving body. The auxiliary chamber receives the expansion gas to adjust the expansion mode of the expansion chamber. The plurality of orifices include one or more secondary chamber orifices leading to the communication flow path, The plurality of non-expansion portions include a partitioned non-expansion portion that partitions the expansion chamber and the sub-chamber, and the partitioned non-expansion portion is provided to be longer than a width of an orifice of the sub-chamber.

10. The curtain airbag device according to claim 9, wherein: The partitioned non-expandable portion further comprises: A branch portion that branches into two branches at the end portion that divides the non-expandable portion; and The arc-shaped portion connects the front ends of the branch portions.

11. The curtain airbag device according to claim 10, wherein: The secondary chamber has only one opening, The sub-chamber orifice is configured to function as an opening of the sub-chamber.

12. The curtain airbag device according to claim 11, wherein: The communication flow path is arranged on the rear side with respect to the expansion chamber, and is configured to function as the expansion portion.

13. The curtain airbag device according to claim 12, wherein: The airbag body further includes a first expansion chamber opening as an opening of the expansion chamber among the plurality of openings, and the first expansion chamber opening leads to the communication flow path. The width of the first expansion chamber opening is greater than the width of the auxiliary chamber opening.

14. The curtain airbag device according to claim 13, wherein: The airbag body also has: a first non-expansion portion among the plurality of non-expansion portions, partially dividing the communication flow path and the expansion chamber as the expansion portion; a main body opening to which inflation gas is supplied; and a second expansion chamber opening among the plurality of openings leading to the main body opening, wherein the second expansion chamber opening is partially divided by the first non-expandable portion, The width of the second expansion chamber opening is greater than the width of the first expansion chamber opening.

15. The curtain airbag device according to claim 14, wherein: The main body opening is the innermost portion of a flow path connecting the outside and the inside of the airbag main body in the airbag main body, and is defined by a non-expandable portion on the outside of the airbag main body. The first non-expandable portion has a shape in which a dimension along a width direction of the main body opening is larger than a dimension along a direction perpendicular to the width direction.

16. The curtain airbag device according to claim 15, wherein: The airbag body further includes other openings other than the first expansion chamber opening and the sub-chamber opening among the plurality of openings as openings of the communication flow path serving as an expansion portion, The further aperture opens into the body opening.

17. The curtain airbag device according to claim 16, wherein: The communication flow path as the expansion portion mitigates the impact on the protection object caused by contact with the protection object. The airbag body also has: an additional sub-chamber that adjusts the expansion mode in the communication flow path as the expansion section by receiving the expansion gas; a central orifice disposed at a position opposite to the main body opening and discharging the inflation gas to the communication flow path and the additional sub-chamber as the inflation portion; as well as a second non-expandable portion among the plurality of non-expandable portions that partially defines the communicating flow path serving as the expansion portion and the additional auxiliary chamber, The end of the second non-expandable portion defines the narrowest portion of the other orifice and is disposed within the width of the central orifice when viewed along the flow path of the inflation gas flowing through the central orifice.

18. The curtain airbag device according to claim 17, wherein: An end portion of the second non-expanded portion is formed in a convex shape toward the first non-expanded portion.

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