Curtain airbag device

Abstract

To hardly generate stress concentration in a non-inflation section in a curtain airbag device.SOLUTION: A bag body in a curtain airbag device includes: a plurality of non-inflation sections; an inflation chamber and an auxiliary chamber as inflation sections; a plurality of orifices through which inflation gas is circulated; one or more communication flow passages through which the inflation chamber and the auxiliary chamber communicate with each other. The inflation chamber alleviates impact to a protection object due to contact with the protection object in a movable body. The auxiliary chamber adjusts the way of inflation about the inflation chamber by receiving inflation gas. The plurality of orifices include one or more auxiliary chamber orifices leading to the communication flow passages. The plurality of non-inflation sections include partitioning non-inflation sections for partitioning the inflation chamber and the auxiliary chamber, the partitioning non-inflation sections provided to have longer widths than those of the auxiliary chamber orifices.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a curtain airbag device. [Background technology]

[0002] Conventionally, in a vehicle, a curtain airbag device exists as a protection device for an occupant that is provided on a side wall of a vehicle interior. The curtain airbag device includes an airbag that is deployed between the side wall and the occupant by supplying inflation gas. In order to adjust the internal pressure of the airbag, for example, as disclosed in Patent Document 1, the airbag may be provided with a sub-chamber.

[0003] The main and auxiliary chambers of an airbag are the sections that inflate when the airbag is deployed by inflation gas. The main chamber is primarily used to protect the head of the occupant. The auxiliary chamber, in addition to protecting the occupant, is connected to the main chamber to adjust the internal pressure of the main chamber. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-016165 A Summary of the Invention [Problem to be solved by the invention]

[0005] The main chamber and the auxiliary chamber are provided by forming a non-inflatable portion in the airbag. Specifically, the non-inflatable portion is a joint portion formed by partially joining two sheets of fabric that constitute the airbag by sewing. The non-inflatable portion is formed between the main chamber and the auxiliary chamber to define the main chamber and the auxiliary chamber. Therefore, stress concentration may occur in the non-inflatable portion due to the expansion of the main chamber and the auxiliary chamber when the airbag is deployed. [Means for solving the problem]

[0006] The present disclosure can be realized in the following forms.

[0007] (1) According to a first embodiment of the present disclosure, there is provided a curtain airbag device for a moving body. The curtain airbag device includes a bag body that is inflated and deployed by being supplied with inflation gas. The bag body includes a plurality of non-inflatable parts as portions where fabrics constituting the bag body are joined, an expansion chamber and an auxiliary chamber as expansion parts surrounded by one or more of the non-inflatable parts, a plurality of orifices for circulating the inflation gas received in the expansion chamber or the auxiliary chamber, and one or more communication flow paths that communicate the expansion chamber and the auxiliary chamber. The expansion chamber is supplied with the inflation gas and inflates to reduce an impact on the protected object caused by contact with the protected object in the moving body. The auxiliary chamber receives the inflation gas and adjusts the manner of inflation of the expansion chamber. The plurality of orifices include one or more auxiliary chamber orifices that communicate with the communication flow path. The plurality of non-inflatable parts include a partition non-inflatable part that partitions the expansion chamber and the auxiliary chamber, and the partition non-inflatable part is provided longer than the width of the auxiliary chamber orifice. With this configuration, the force that the non-inflatable compartment portion receives when the bag main body is deployed can be received by the entire non-inflatable compartment portion, which is longer than the width of the auxiliary chamber orifice. Therefore, stress concentration is less likely to occur in the non-inflatable compartment portion compared to an embodiment in which the non-inflatable compartment portion is shorter than the width of the auxiliary chamber orifice, for example, an embodiment in which the main chamber and the auxiliary chamber are separated by a plurality of dot-like or island-like non-inflatable portions. (2) In the above embodiment, the non-expanding portion of the partition may further include a bifurcated branch portion at an end of the non-expanding portion of the partition, and an arc-shaped portion connecting the respective ends of the branch portion. By adopting such a configuration, the end of the non-expanding section is less likely to experience stress concentration compared to a configuration that does not have a closed portion formed by an arc-shaped portion or a branch portion. (3) In the above aspect, the auxiliary chamber may be configured to have only one opening, and the auxiliary chamber orifice may be configured to function as the opening of the auxiliary chamber. By adopting such a configuration, the amount of inflation gas that can flow into the auxiliary chamber is limited by the size of the auxiliary chamber. In other words, the amount of inflation gas that flows out of the main chamber is also limited. Therefore, the curtain airbag device of the present disclosure can easily adjust the internal pressure of the main chamber by adjusting the size of the auxiliary chamber. Therefore, the curtain airbag device of the present disclosure can more effectively mitigate the impact on the protected object. (4) In the above aspect, the communication flow passage may be disposed rearward of the expansion chamber and configured to function as the expansion portion. With this configuration, the volume of the communication passage becomes larger than when it functions only as a passage for inflation gas. In other words, the flow of inflation gas between the main chamber and the auxiliary chamber becomes gentle. Therefore, the curtain airbag device of the present disclosure can reduce the impact on the protected object by easing the pressure fluctuation in the main chamber caused by contact with the protected object. (5) In the above embodiment, the bag body may further include a first expansion chamber orifice among the multiple orifices as an opening of the expansion chamber, the first expansion chamber orifice communicating with the communicating flow path, and the width of the first expansion chamber orifice may be larger than the width of the sub-chamber orifice. In this configuration, the inflation gas in the main chamber flows toward the auxiliary chamber more easily than when the width of the first expansion chamber orifice is smaller than the width of the auxiliary chamber orifice, and therefore the curtain airbag device of the present disclosure can easily adjust the pressure in the main chamber to cushion the impact. (6) In the above embodiment, the bag body further includes a first non-inflatable portion among the multiple non-inflatable portions that partially separates the communicating flow passage as the inflatable portion and the expansion chamber, a main body opening to which inflation gas is supplied, and a second expansion chamber orifice among the multiple orifices that communicates with the main body opening, the second expansion chamber orifice being partially defined by the first non-inflatable portion, and the width of the second expansion chamber orifice may be greater than the width of the first expansion chamber orifice. With this configuration, the inflation gas flows more easily into the main chamber from the main body opening compared to when the width of the second expansion chamber orifice is smaller than the width of the first expansion chamber orifice, and therefore the main chamber can be deployed more easily. (7) In the above embodiment, the main body opening may be the innermost part of a flow path in the bag body that connects the outside and inside of the bag body, and may be defined by a non-inflatable portion on the outside of the bag body, and the first non-inflatable portion may have a shape in which the dimension along the width direction of the main body opening is greater than the dimension along a direction perpendicular to the width direction. In this configuration, the inflation gas discharged from the main body opening flows in a direction perpendicular to the width direction of the main body opening, and the first non-inflatable portion has a large shape in the direction along the flow of the inflation gas, thereby reducing the load caused by the inflation gas. (8) In the above embodiment, the bag body may further include an orifice other than the first expansion chamber orifice and the sub-chamber orifice as an opening of the communicating flow passage as the expansion section, among the plurality of orifices, and the other orifice may be connected to the body opening. With this configuration, the inflation gas that inflates the auxiliary chamber is branched and flows through the first expansion chamber orifice as the opening of the main chamber and through the other orifices. In other words, the amount of inflation gas passing through the main chamber is reduced, thereby reducing the pressure in the main chamber. Therefore, the load applied to the non-expanding section is reduced, thereby reducing the stress generated in the non-expanding section. (9) In the above embodiment, the communicating passage as the inflation portion cushions the impact on the protected object due to contact with the protected object, and the bag body further includes an additional auxiliary chamber that receives inflation gas to adjust the manner of inflation in the communicating passage as the inflation portion, a central orifice arranged opposite the main body opening and discharging inflation gas to the communicating passage as the inflation portion and the additional auxiliary chamber, and a second non-inflatable portion among the multiple non-inflatable portions that partially separates the communicating passage as the inflation portion and the additional auxiliary chamber, and an end of the second non-inflatable portion defines the narrowest portion of the other orifice and is arranged within the width of the central orifice when viewed along the direction of the flow path of the inflation gas flowing through the central orifice. With this configuration, the inflation gas flowing through the central orifice is directed by the second non-expandable portion to the communicating passage as the expansion portion and the additional auxiliary chamber. In other words, the inflation gas is more likely to flow into portions other than the expansion portion connected to the main chamber, reducing the pressure in the main chamber. This reduces the load applied to the non-expandable portion, thereby reducing the stress generated in the non-expandable portion. (10) In the above embodiment, an end of the second non-expanding portion may be formed in a convex shape toward the first non-expanding portion. With this configuration, the inflation gas discharged from the central orifice is more likely to flow into the additional sub-chamber along the end of the convex second non-inflatable portion. In other words, the pressure in the main chamber is further reduced. Therefore, the load applied to the non-inflatable portion is reduced, and the stress generated in the non-inflatable portion is reduced. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is an explanatory diagram showing a curtain airbag device in a vehicle. [Diagram 2] FIG. 2 is an explanatory diagram showing a bag body. [Diagram 3] FIG. [Figure 4] 4 is a photograph showing a curtain airbag device in a folded state. [Diagram 5] 5 is a photograph showing the curtain airbag device in the middle of deployment. [Figure 6] 5 is a photograph showing the curtain airbag device in the middle of deployment. [Figure 7] 13 is a photograph showing the state in which the bag body has been completely inflated. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A. First embodiment: A-1. Equipment configuration: Fig. 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 the vehicle MV and protects a protected object PO when a collision occurs or is predicted for the vehicle MV. Fig. 1 shows the curtain airbag device 100 as viewed from inside the vehicle at a side wall portion of the vehicle MV.

[0010] In the drawings and the following description, the forward direction FD indicates the front in the traveling direction of the vehicle MV, and the rearward direction BD indicates the rear in the traveling direction of the vehicle MV. Furthermore, the upward direction UD indicates the upper side in the height direction of the vehicle MV, and the downward direction DD indicates the lower side in the height direction of the vehicle MV. In this specification, one side of an object may be indicated based on the direction of the drawings. For example, when indicating that it is located in the forward direction FD, it is described as "front side". Furthermore, the direction along the forward direction FD and the rearward direction BD is called the forward / rearward direction. The direction along the upward direction UD and the downward direction DD is called the up / down direction. The direction perpendicular to the forward / rearward direction and the up / down direction is called the left / right direction. In FIG. 1, only the leftward direction LD, which is parallel to the left / right direction, is illustrated.

[0011] The vehicle MV has two rows of seats. The vehicle MV has a first row at the front and a second row at the rear. Furthermore, the vehicle MV has an A-pillar MVp1, a B-pillar MVp2, and a C-pillar MVp3 on the side wall portions in the left-right direction. In addition, the vehicle MV has a front door MVd1 including a front side window MVw1 between the A-pillar MVp1 and the B-pillar MVp2. A rear door MVd2 including a rear side window MVw2 between the B-pillar MVp2 and the C-pillar MVp3. In this specification, the scope of the various pillars also includes covers that cover the structural parts of the vehicle MV.

[0012] In this embodiment, the protection targets PO are a protection target PO1 as an occupant in the first row of the vehicle MV and a protection target PO2 as an occupant in the second row of the vehicle MV. As shown in Fig. 1, the protection targets PO are illustrated by dashed lines.

[0013] The curtain airbag device 100 includes an inflator 130, an inner tube 120, a bag body 110, and a storage section (not shown). In the curtain airbag device 100, the bag body 110, the inner tube 120, and the inflator 130 are stored in a roof side MVr portion on the upper side of a side wall of the vehicle MV as a storage section. The bag body 110 and the inner tube 120 are stored in a folded state in the storage section. When protecting a protection object PO, the curtain airbag device 100 deploys the bag body 110, the inner tube 120, and the like from the storage section toward the downward direction DD. Specifically, as shown in FIG. 1, the storage section is provided in a portion extending from a part of the A-pillar MVp1 to a part of the C-pillar MVp3 of the vehicle MV, above a front side window MVw1 and a rear side window MVw2.

[0014] The inflator 130 injects the inflation gas IG into the bag 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 the inflation gas IG. The inflator 130 is disposed in an opening at the top of the curtain airbag device 100 in Fig. 1. The inflator 130 is inserted into an inner tube 120, which will be described later.

[0015] FIG. 2 is an explanatory diagram showing the bag body 110. The inner tube 120 straightens the flow of the inflation gas IG and causes the inflation gas IG to flow into the bag body 110. The inner tube 120 is disposed in the bag body 110. A part of the inflator 130 is inserted into the inner tube 120 to receive the inflation gas IG inside. The inner tube 120 has a plurality of openings that communicate with various openings and various orifices of the bag body 110. More specifically, the inner tube 120 has an opening 121 for the central main chamber, an opening 126 for the rear auxiliary chamber, an opening 122 for the front main chamber, and an opening 123 for the rear main chamber.

[0016] The opening 121 for the central main chamber is disposed opposite the first central orifice MO11 and discharges the inflation gas IG. The opening 126 for the rear auxiliary chamber is disposed opposite the second central orifice SO11 and discharges the inflation gas IG. The various orifices will be described later.

[0017] The opening 122 for the front main chamber discharges the inflation 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.

[0018] The opening 123 for the rear main chamber discharges the inflation gas IG to the rear main chamber MC3, which will be described later. That is, the opening 123 for the rear main chamber is inserted into the opening of the rear main chamber MC3.

[0019] The bag body 110 is inflated and deployed when inflation gas IG is supplied to the bag body 110. The bag body 110 is a bag body made of, for example, a woven fabric made of polyamide. The bag body 110 includes a plurality of non-inflatable parts 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.

[0020] The main body opening SP supplies the inflation gas IG to the bag body 110. The main body opening SP is the innermost part of the flow path that connects the outside and inside of the bag body 110. The main body opening SP is defined by two peripheral non-inflatable parts 112o as the outer non-inflatable part 112 of the bag body 110. That is, as shown in FIG. 2, the main body opening SP is a connecting part of the bag body 110 where the inflator 130 is inserted and the bag body 110. The main body opening SP receives the inflation gas IG supplied from the inflator 130 into the bag body 110.

[0021] 3, which will be described later, shows a width direction Wd of the main body opening SP as a direction parallel to a line connecting two peripheral non-inflatable portions 112o, and a 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 in this other embodiment, and the direction Vd perpendicular to the width direction Wd is also a direction along the up-down direction in this embodiment.

[0022] The non-inflatable portions 112 are portions where the fabrics constituting the bag body 110 are joined. More specifically, the non-inflatable portions 112 are joint portions formed by partially joining two pieces of fabric constituting the airbag by sewing. That is, the non-inflatable portions 112 do not inflate even when the inflation gas IG is received in the bag body 110. As shown in FIG. 2, the non-inflatable portions 112 are not limited to portions along the outer periphery of the bag body 110. The non-inflatable portions 112 also include portions that extend toward the inside of the bag body 110 and portions that are formed in an island shape within the bag body 110.

[0023] In this embodiment, the multiple non-inflatable portions 112 include a peripheral non-inflatable portion 112o, a first non-inflatable portion 112A, a second non-inflatable portion 112B, a third non-inflatable portion 112C, a fourth non-inflatable portion 112D, and a partition non-inflatable portion 112S.

[0024] The peripheral non-inflatable portion 112o determines the overall shape of the bag body 110 when inflated by receiving the inflation gas IG. As shown in Fig. 2, the peripheral non-inflatable portion 112o is the non-inflatable portion 112 disposed on the outermost side of the bag body 110. In other words, the peripheral non-inflatable portion 112o is a portion along the outer periphery of the bag body 110.

[0025] The partition non-inflatable portion 112S separates the front main chamber MC2 from the front auxiliary chamber SC2. The partition non-inflatable portion 112S is shown on the front side in FIG. 2. The partition non-inflatable portion 112S is a non-inflatable portion 112 extending inward from the lower side of the bag body 110. More specifically, the partition non-inflatable portion 112S is provided longer than the width Ws2 of the front auxiliary chamber orifice SO2, thereby separating the front main chamber MC2 from the front auxiliary chamber SC2. The partition non-inflatable portion 112S will be described in detail later.

[0026] FIG. 3 is an enlarged view of the bag body. The first non-inflatable portion 112A partially divides the communication flow path MC1 as an inflatable portion and the front main chamber MC2. The first non-inflatable portion 112A is illustrated near the center in FIG. 3. The first non-inflatable portion 112A is an island-shaped non-inflatable portion 112 inside the bag body 110. The first non-inflatable 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 this embodiment, the first non-inflatable portion 112A has a rectangular shape whose longitudinal direction is along the up-down direction. Therefore, of the side surfaces along the longitudinal direction of the first non-inflatable portion 112A, the front side surface faces the front main chamber MC2. Of the side surfaces along the short side direction of the first non-inflatable portion 112A, the lower side surface faces the communication flow path MC1. The various main chambers and the various auxiliary chambers will be described in detail later.

[0027] The first non-inflatable 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 various orifices by the first non-inflatable portion 112A will be described along with the various orifices.

[0028] The second non-inflatable portion 112B partially divides the communication passage MC1, which serves as an expansion portion, and the rear auxiliary chamber SC1. The second non-inflatable portion 112B is illustrated near the center in FIG. 2. The second non-inflatable portion 112B is a non-inflatable portion 112 that extends inward from the lower outer peripheral non-inflatable portion 112o. Furthermore, the second non-inflatable portion 112B partially divides the central main chamber orifice MO12, the rear orifice CO2, and the rear auxiliary chamber orifice SO12.

[0029] The end 112Ba of the second non-inflatable portion 112B defines the narrowest portion of the central main chamber orifice MO12. As shown in Fig. 3, the end 112Ba of the second non-inflatable portion 112B is disposed within the range of the width Wm1 of the first central orifice MO11 when viewed along the direction Fm1 of the flow path of the inflation gas IG flowing through the first central orifice MO11. That is, as shown in Fig. 2, the end 112Ba of the second non-inflatable portion 112B is disposed between the first non-inflatable portion 112A and the fourth non-inflatable portion 112D in the front-rear direction.

[0030] The third non-inflatable portion 112C divides the rear main chamber MC3 and the rear auxiliary chamber SC1. The third non-inflatable portion 112C is illustrated on the rear side in FIG. 2. The third non-inflatable portion 112C is a non-inflatable portion 112 extending inward from the rear outer peripheral non-inflatable portion 112o. Furthermore, the third non-inflatable portion 112C partially defines the second central orifice SO11 and the rear auxiliary chamber orifice SO12.

[0031] The fourth non-inflatable portion 112D partially defines the first central orifice MO11, the second central orifice SO11, and the rear orifice CO2. The fourth non-inflatable portion 112D is shown in the center in FIG. 2. The fourth non-inflatable portion 112D is an island-shaped non-inflatable portion 112 inside the bag body 110. The fourth non-inflatable portion 112D is surrounded by the body opening SP, the first non-inflatable portion 112A, the second non-inflatable portion 112B, and the third non-inflatable portion 112C.

[0032] Each of the main chambers is an expansion section surrounded by one or more of the non-inflatable sections 112. The main chambers include a front main chamber MC2, a center main chamber MC1, and a rear main chamber MC3. Each main chamber is supplied with inflation gas IG and expands to cushion an impact on the protected object PO caused by contact with the protected object PO inside the vehicle. The "front main chamber" is also called an "expansion chamber."

[0033] The front main chamber MC2 is disposed in front of the vehicle MV and absorbs impacts on the protected object PO1 caused by contact of the vehicle MV with the protected object PO1. As shown in Fig. 2, the front main chamber MC2 is partitioned by an outermost non-inflatable portion 112o in the bag body 110, a first non-inflatable portion 112A, and a partition non-inflatable portion 112S. The openings in the front main chamber MC2 are a first front main chamber orifice CO1 and a second front main chamber orifice MO2, which will be described later.

[0034] The front main chamber MC2 is provided within a range determined in advance based on, for example, the requirements for evaluation by the New Car Assessment Program (NCAP) or the customer's required specifications. That is, the range of the front main chamber MC2 is determined so as to ensure a thickness required for various requirements, such as requirements for ejection from the vehicle and requirements for evaluation in an impactor test. Note that the thickness of the front main chamber MC2 is a thickness that occurs due to expansion in the left-right direction. In this specification, when the thickness of various main chambers and the thickness of various auxiliary chambers are mentioned, the same thickness is indicated.

[0035] The rear main chamber MC3 is disposed at the rear of the vehicle MV and absorbs impacts on the protected object PO2 caused by contact of the vehicle MV with the protected object PO2. As shown in FIG. 2, the rear main chamber MC3 is partitioned by an outer peripheral non-inflatable portion 112o and a third non-inflatable portion 112C. An opening in the rear main chamber MC3 receives an opening 123 for the rear main chamber. The range of the rear main chamber MC3 is determined in the same manner as the front main chamber MC2.

[0036] As 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 absorbs impacts on the protected objects PO caused by contact between the protected objects PO, including the protected objects PO1 and PO2. As shown in Fig. 2, the central main chamber MC1 is partitioned by an outer peripheral non-inflatable portion 112o, a second non-inflatable portion 112B, a partition non-inflatable portion 112S, and a first non-inflatable portion 112A. The range of the central main chamber MC1 is determined in the same manner as the front main chamber MC2.

[0037] The communication passage MC1 communicates the front main chamber MC2 and the front auxiliary chamber SC2. In this embodiment, the central main chamber MC1 is configured to also function as the communication passage MC1. The communication passage MC1 is disposed rearward of the front main chamber MC2 and configured to function as an expansion section. That is, the communication passage MC1 as an expansion section absorbs impact on the protected object PO due to contact with the protected object PO.

[0038] The multiple auxiliary chambers include a front auxiliary chamber SC2 and a rear auxiliary chamber SC1. The various auxiliary chambers adjust the manner in which the front main chamber MC2 is inflated by receiving inflation gas IG. The "front auxiliary chamber" is also referred to simply as the "auxiliary chamber," and the "rear auxiliary chamber" is also referred to as the "additional auxiliary chamber."

[0039] The front auxiliary chamber SC2 adjusts the manner in which the front main chamber MC2 and the central main chamber MC1 are inflated. More specifically, the front auxiliary chamber SC2 receives the inflation gas IG from the front main chamber MC2 and the central main chamber MC1 when pressure fluctuations occur in the front main chamber MC2 and the central main chamber MC1 due to deployment of the bag body 110 or contact with the protected PO. That is, the front auxiliary chamber SC2 adjusts the pressure in the front main chamber MC2 and the central main chamber MC1. Therefore, when it functions in response to contact with the protected PO, the impact on the protected PO in the front main chamber MC2 and the central main chamber MC1 is mitigated.

[0040] The front auxiliary chamber SC2 further absorbs the impact of the protected object PO in the front auxiliary chamber SC2 and prevents the protected object PO from being thrown out of the vehicle. The front auxiliary chamber SC2 is provided in a predetermined range together with the front main chamber MC2. As described above, the front main chamber MC2 is determined so as to ensure a thickness required for various requirements. The front auxiliary chamber SC2 is determined so as to ensure a range required for various requirements. For example, as shown in FIG. 2, the front auxiliary chamber SC2 is provided below the front main chamber MC2 between the front main chamber MC2 and the central main chamber MC1 in the front-rear direction so as to ensure a range A1 required by the NCAP requirements.

[0041] 2, the front auxiliary chamber SC2 is defined by the outer circumferential non-inflatable portion 112o and the partition non-inflatable portion 112S. That is, the front auxiliary chamber SC2 is separated from the front main chamber MC2 by the partition non-inflatable portion 112S below the front main chamber MC2.

[0042] The front auxiliary chamber SC2 has only one opening. The opening of the front auxiliary chamber SC2 is a front auxiliary chamber orifice SO2, which will be described later, and is connected to a communication passage MC1 that connects the front main chamber MC2 and the front auxiliary chamber SC2. The communication passage MC1 is also the central main chamber MC1. That is, the front auxiliary chamber SC2 is inflated by receiving the inflation gas IG from the front main chamber MC2 and the central main chamber MC1.

[0043] The rear auxiliary chamber SC1 receives the inflation gas IG to adjust the manner of inflation in the rear main chamber MC3 and the communication passage MC1 serving as an inflation section. More specifically, the rear auxiliary chamber SC1 receives the inflation gas IG from the rear main chamber MC3 or the central main chamber MC1 when pressure fluctuations occur in the rear main chamber MC3 or the central main chamber MC1 due to deployment of the bag body 110 or contact with the protected object PO. That is, the rear auxiliary chamber SC1 adjusts the pressure in the rear main chamber MC3 or the central main chamber MC1. Therefore, when functioning in response to contact with the protected object PO, the impact on the protected object PO in the rear main chamber MC3 or the central main chamber MC1 is mitigated.

[0044] The rear auxiliary chamber SC1 further absorbs impacts on the protected object PO2 and prevents the protected object PO2 from being thrown out of the vehicle, etc. The rear auxiliary chamber SC1, together with the rear main chamber MC3, is provided in a predetermined range similar to the front auxiliary chamber SC2.

[0045] The rear auxiliary chamber SC1 is defined by the outer peripheral non-inflatable portion 112o, the second non-inflatable portion 112B, and the third non-inflatable portion 112C. The rear auxiliary chamber SC1 has only one opening. The opening of the rear auxiliary chamber SC1 is a rear auxiliary chamber orifice SO12, which will be described later. The rear auxiliary chamber SC1 is inflated by receiving the inflation gas IG through the rear auxiliary chamber opening 126.

[0046] The orifices allow the inflation gas IG to flow through the various main chambers or the various auxiliary chambers. As shown in FIG. 3, the orifices include a front auxiliary chamber orifice SO2, a first front main chamber orifice CO1, a second front main chamber orifice MO2, a first central orifice MO11, a second central orifice SO11, a central main chamber orifice MO12, a rear orifice CO2, and a rear auxiliary chamber orifice SO12.

[0047] Of the multiple orifices, the second front main chamber orifice MO2 is connected to the main body opening SP. More specifically, the second front main chamber orifice MO2, as an opening of the front main chamber MC2, receives the inflation gas IG supplied from the main body opening SP at a position closest to the main body opening SP. The "second front main chamber orifice" is also called the "second expansion chamber orifice."

[0048] The second front main chamber orifice MO2 is partially defined by the first non-inflatable portion 112A. More specifically, the second front main chamber orifice MO2 is defined on one lower side by the first non-inflatable portion 112A and on the other upper side by the peripheral non-inflatable portion 112o. The width Wc2 of the second front main chamber orifice MO2 represents the width of the narrowest portion of the second front main chamber orifice MO2.

[0049] Among the multiple orifices, the first front main chamber orifice CO1 functions as an opening of the communication passage MC1. The first front main chamber orifice CO1 communicates with the communication passage MC1 as an opening of the front main chamber MC2. That is, the first front main chamber orifice CO1 allows the inflation gas IG to flow between the front main chamber MC2 and the central main chamber MC1. The "first front main chamber orifice" is also called the "first expansion chamber orifice."

[0050] The first front main chamber orifice CO1 further allows the inflation gas IG in the front main chamber MC2 to flow to the front auxiliary chamber SC2 through the communication passage MC1 when a pressure fluctuation occurs in the front main chamber MC2 due to contact between the front main chamber MC2 and the protected object PO1.

[0051] The first front main chamber orifice CO1 is defined by the partition non-inflatable portion 112S and the first non-inflatable portion 112A. The first front main chamber orifice CO1 is defined on one lower side by the partition non-inflatable portion 112S and on the other upper side by the first non-inflatable portion 112A. The width of the narrowest portion of the first front main chamber orifice CO1 is referred to as the width Wc1 of the first front main chamber orifice CO1.

[0052] 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 bag body 110 as an opening connecting the front auxiliary chamber SC2 and the central main chamber MC1. Thus, the front auxiliary chamber orifice SO2 allows the inflation gas IG to flow through the central main chamber MC1 to the front auxiliary chamber SC2. The "front auxiliary chamber orifice" is also simply called the "auxiliary chamber orifice."

[0053] The front sub-chamber orifice SO2 is defined by a partition non-inflatable portion 112S and a peripheral non-inflatable portion 112o, which will be 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.

[0054] Among the widths of the various orifices, the width Wc1 of the first front main chamber orifice CO1 is larger than the width Ws2 of the front auxiliary chamber orifice SO2. More specifically, the cross-sectional area of ​​the flow passage in the first front main chamber orifice CO1 is larger than the cross-sectional area of ​​the flow passage in the front auxiliary chamber orifice SO2. With this configuration, the inflation gas IG in the front main chamber MC2 flows out toward the front auxiliary chamber SC2 more easily than when the width Wc1 of the first front main chamber orifice CO1 is smaller than the width Wc2 of the front auxiliary chamber orifice SO2. Therefore, the curtain airbag device 100 of the present disclosure can easily adjust the pressure in the front main chamber MC2 to mitigate the impact.

[0055] Furthermore, among the widths of the various orifices, the width Wc2 of the second front main chamber orifice MO2 is larger than the width Wc1 of the first front main chamber orifice CO1. More specifically, the cross-sectional area of ​​the flow passage in the second front main chamber orifice MO2 is larger than the cross-sectional area of ​​the flow passage in the first front main chamber orifice CO1. With this configuration, the inflation gas IG flows more easily from the main body opening SP into the front main chamber MC2, compared to when 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.

[0056] The first central orifice MO11 is disposed at a position facing the main body opening SP, and discharges the inflation gas IG from the main body opening SP toward the central main chamber MC1 and the rear auxiliary chamber SC1. Furthermore, the first central orifice MO11 also functions as a flow path for the inflation gas IG that flows between the central main chamber MC1, the front main chamber MC2, etc. due to contact with the protected object PO. The first central orifice MO11 is defined by the first non-inflatable portion 112A and the fourth non-inflatable portion 112D. The "first central orifice" is also simply called the "central orifice."

[0057] The second central orifice SO11 is disposed at a position facing the main body opening SP, and discharges the inflation gas IG from the main body opening SP toward the rear auxiliary chamber SC1. Furthermore, the first central orifice MO11 also functions as a flow path for the inflation gas IG that flows between the rear main chamber MC3, the rear auxiliary chamber SC1, etc. due to contact with the protected object PO. The second central orifice SO11 is defined by a fourth non-inflatable portion 112D and a third non-inflatable portion 112C.

[0058] The rear orifice CO2 discharges the inflation gas IG from the main body opening SP toward the rear. The rear orifice CO2 is disposed between the first central orifice MO11 and the second central orifice SO11 in the front-rear direction. The rear orifice CO2 is defined by the fourth non-inflatable portion 112D and the second non-inflatable portion 112B. As described above, the end 112Ba of the second non-inflatable portion 112B is disposed between the first non-inflatable portion 112A and the fourth non-inflatable portion 112D in the front-rear direction. That is, the end 112Ba of the second non-inflatable portion 112B is also disposed between the first non-inflatable portion 112A and the third non-inflatable portion 112C. The portion of the second non-inflatable portion 112B that defines the rear orifice CO2 partially defines the rear orifice CO2 rearward of the end portion 112Ba of the second non-inflatable portion 112B in the front-rear direction.

[0059] The central main chamber orifice MO12 is an orifice other than the first front main chamber orifice CO1 and the front auxiliary chamber orifice SO2 as an opening of the communication passage MC1 as an expansion section. The central main chamber orifice MO12 is provided so as to communicate with the main body opening SP. The central main chamber orifice MO12 is defined by the first non-inflatable section 112A and the end 112Ba of the second non-inflatable section 112B. That is, the central main chamber orifice MO12 receives the inflation gas IG supplied from the main body opening SP into the central main chamber MC1 via the first central orifice MO11. The "central main chamber orifice" is also called the "other orifice."

[0060] The central main chamber orifice MO12 is further 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 that flows between the central main chamber MC1 and the rear auxiliary chamber SC1 due to contact with the object to be protected PO.

[0061] The rear sub-chamber orifice SO12, which serves as an opening of the rear sub-chamber SC1, communicates with the rear orifice CO2 and the second central orifice SO11. That is, the rear sub-chamber orifice SO12 receives the inflation gas IG supplied from the main body opening SP into 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 flows between the central main chamber MC1 and the rear sub-chamber SC1 due to contact with the protected object PO.

[0062] A-2. Composition of non-expandable section: As described above, the non-inflatable partition portion 112S divides the front main chamber MC2 and the front auxiliary chamber SC2. The non-inflatable partition portion 112S includes a front end portion 112Sb, a central portion 112Sc, and a rear end portion 112Sa. As shown in FIG. 3, the non-inflatable partition portion 112S divides the front main chamber MC2 and the front auxiliary chamber SC2 by the central portion 112Sc extending along the front-rear direction below the front main chamber MC2. In the non-inflatable partition portion 112S, the front end portion 112Sb and the rear end portion 112Sa extend from the central portion 112Sc toward the outside of the bag body 110. The "rear end portion" is also simply referred to as the "end portion of the non-inflatable partition portion."

[0063] The front end 112Sb is connected to the lower peripheral non-inflatable portion 112o of the bag body 110. The front end 112Sb has a convex shape facing the forward direction FD. That is, the partition non-inflatable portion 112S is formed in an arc shape from the lower peripheral non-inflatable portion 112o toward the rear side. With this configuration, the front end 112Sb does not have corners, and therefore is less likely to experience stress concentration when subjected to a load due to expansion, compared to a configuration with corners.

[0064] As described above, the central portion 112Sc extends in the front-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 partition non-inflatable portion 112S. As described above, the partition non-inflatable portion 112S is provided longer than the width Ws2 of the front auxiliary chamber orifice SO2, thereby separating the front main chamber MC2 and the front auxiliary chamber SC2. That is, the length L1 of the partition non-inflatable portion 112S of the central portion 112Sc is longer than the width Ws2 of the front auxiliary chamber orifice SO2.

[0065] With this configuration, the force received by the partition non-inflatable portion 112S when the bag body 110 is deployed can be received by the entire partition non-inflatable portion 112S, which is provided longer than the width Ws2 of the front auxiliary chamber orifice SO2. For this reason, stress concentration is less likely to occur in the partition non-inflatable portion 112S compared to an embodiment in which the partition non-inflatable portion 112S is shorter than the width Ws2 of the front auxiliary chamber orifice SO2, for example, an embodiment in which the front main chamber MC2 and the front auxiliary chamber SC2 are partitioned by a plurality of dot-like or island-like non-inflatable portions 112.

[0066] The rear end 112Sa is disposed on the side of the opening of the front sub-chamber SC2 and partially defines the rear sub-chamber orifice SO12. The rear end 112Sa has a branched portion 112Sa1 and an arc-shaped portion 112Sa2. The branched portion 112Sa1 branches into two at the rear end 112Sa. The arc-shaped portion 112Sa2 connects the respective tips of the branched portions 112Sa1 in an arc shape. In other words, the shape of the rear end 112Sa is annular.

[0067] By adopting this type of configuration, the end 112Sa of the partition non-expanding portion 112S is less likely to experience stress concentration when subjected to a load due to expansion, compared to an embodiment that does not have a closed portion formed by the arc-shaped portion 112Sa2 or the branch portion 112Sa1.

[0068] A-3.Bag deployment and expansion: Fig. 4 is a photograph showing the folded state of the curtain airbag device 100. Fig. 4 shows a state in which the bag body 110, the inner tube 120, and the inflator 130 are stored in the roof side MVr portion in Fig. 1. That is, the bag body 110 and the inner tube 120 are in a folded state. Fig. 4 shows an impactor IM used in the impactor test, which simulates the protected object PO1.

[0069] 4 to 7 is in a state in which the bag body 110 faces in the opposite direction to the bag body 110 in Fig. 1 to Fig. 3. To facilitate understanding of the technology, components that are not exposed to the outside are indicated by dashed lines.

[0070] Fig. 5 is a photograph showing the curtain airbag device 100 in the middle of deployment. When the curtain airbag device 100 detects or predicts the occurrence of a collision, it injects inflation gas IG to the inflator 130. By receiving the inflation gas IG, the bag body 110 and the inner tube 120 start to inflate, and the bag body 110 and the inner tube 120 are deployed from a folded state. In Fig. 5, the bag body 110 is partially deployed by supplying the inflation gas IG to a part of the bag body 110.

[0071] 5, the bag body 110 inflates first from various main chambers such as the front main chamber MC2 and the central main chamber MC1. Since the width Ws2 of the rear auxiliary chamber orifice SO12 is designed to be small, the inflation gas IG does not easily flow into the front auxiliary chamber SC2 until the various main chambers such as the front main chamber MC2 and the central main chamber MC1 reach a certain pressure.

[0072] Fig. 6 is a photograph showing the curtain airbag device 100 in the middle of deployment. Fig. 6 shows the front auxiliary chamber SC2 in the middle of inflation. When the front main chamber MC2 and the central main chamber MC1 are filled with inflation gas IG and reach a certain pressure, the inflation gas IG tends to flow from the front main chamber MC2 and the central main chamber MC1 toward the front auxiliary chamber SC2. Therefore, the front auxiliary chamber SC2 inflates later than the front main chamber MC2 and the central main chamber MC1.

[0073] As shown in FIG. 6, the front main chamber MC2 is divided by the non-expandable section 112S and expands. Therefore, stress occurs in the non-expandable section 112S due to the load caused by the expansion of the front main chamber MC2. As described above, the central section 112Sc and the front end 112Sb of the non-expandable section 112S face the front main chamber MC2. Therefore, specifically, stress occurs in the central section 112Sc and the front end 112Sb. In the central section 112Sc, the length L1 of the central section 112Sc is longer than the width Ws2 of the front auxiliary chamber orifice SO2, so that stress concentration is unlikely to occur. The front end 112Sb is also unlikely to be concentrated by being formed in an arc shape.

[0074] 7 is a photograph showing a state in which the inflation of the bag body 110 is completed. In the non-inflatable portion 112S, stress is generated in the rear end portion 112Sa facing the central main chamber MC1 due to the load caused by the inflation of the central main chamber MC1. However, stress is less likely to concentrate on the end portion 112Sa of the non-inflatable portion 112S compared to an embodiment that does not have a closed portion formed by the arc-shaped portion 112Sa2 or the branch portion 112Sa1.

[0075] As described above, with this configuration, the force received by the partition non-inflatable portion 112S when the bag body 110 is deployed can be received by the entire partition non-inflatable portion 112S, which is provided longer than the width Ws2 of the front auxiliary chamber orifice SO2. For this reason, stress concentration is less likely to occur in the partition non-inflatable portion 112S compared to an embodiment in which the partition non-inflatable portion 112S is shorter than the width Ws2 of the front auxiliary chamber orifice SO2, for example, an embodiment in which the front main chamber MC2 and the front auxiliary chamber SC2 are partitioned by a plurality of dot-like or island-like non-inflatable portions 112.

[0076] Furthermore, stress concentration is less likely to occur at the end 112Sa of the section non-expanding portion 112S compared to an embodiment that does not include a closed portion formed by the arc-shaped portion 112Sa2 or the branch portion 112Sa1.

[0077] Furthermore, by providing the front auxiliary chamber SC2 with one opening, the amount of inflation gas IG that can flow into the front auxiliary chamber SC2 is limited by the size of the front auxiliary 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 disclosure can easily adjust the internal pressure of the front main chamber MC2 by adjusting the size of the front auxiliary chamber SC2. Therefore, the curtain airbag device 100 of the present disclosure can more effectively mitigate the impact on the protected object PO.

[0078] Furthermore, by making the communication passage MC1 function as an inflation section in this way, the volume of the communication passage MC1 becomes larger than when it functions only as a passage for the inflation gas IG. That is, the flow of the inflation gas IG between the front main chamber MC2 and the front auxiliary chamber SC2 becomes gentle. Therefore, the curtain airbag device 100 of the present disclosure can reduce the impact on the protected object PO by easing the pressure fluctuation in the front main chamber MC2 caused by contact with the protected object PO.

[0079] Furthermore, in the various orifices in the front main chamber MC2, the inflation gas IG in the front main chamber MC2 flows out more easily toward the front auxiliary chamber SC2 than when the width Wc1 of the first front main chamber orifice CO1 is smaller than the width Ws2 of the front auxiliary chamber orifice SO2. Therefore, the curtain airbag device 100 of the present disclosure can easily adjust the pressure in the front main chamber MC2 to mitigate the impact.

[0080] Furthermore, compared to when 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 is more likely to flow into the front main chamber MC2 from the main body opening SP, so that the front main chamber MC2 can be deployed more easily.

[0081] Furthermore, in such a first non-inflatable portion 112A, the inflation 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, by having a shape large in the direction along the flow of the inflation gas IG, the load due to the inflation gas IG can be reduced.

[0082] Furthermore, with this configuration, the inflation gas IG that inflates the front auxiliary chamber SC2 branches off and flows to the first front main chamber orifice CO1 as an opening of the front main chamber MC2 and the central main chamber orifice MO12. That is, the amount of inflation gas IG passing through the front main chamber MC2 is reduced, thereby reducing the pressure in the front main chamber MC2. Therefore, the load applied to the non-inflatable section 112S is reduced, thereby reducing the stress generated in the non-inflatable section 112S.

[0083] Moreover, with this configuration, the inflation gas IG flowing through the first central orifice MO11 flows into the communication passage MC1 and the rear auxiliary chamber SC1 as the inflation portion by the second non-inflatable portion 112B. That is, the inflation gas IG is more likely to flow into portions other than the inflation portion connected to the front main chamber MC2, and the pressure in the front main chamber MC2 is reduced. This reduces the load applied to the partition non-inflatable portion 112S, and reduces the stress generated in the partition non-inflatable portion 112S.

[0084] B. Other embodiments: B1. Alternative embodiment 1: In the above embodiment, the end 112Ba of the second non-inflatable portion 112B may be formed in a convex shape toward the first non-inflatable portion 112A. More specifically, the end 112Ba of the second non-inflatable portion 112B may be in a state of protruding at an interior angle of less than 90 degrees. With this configuration, the inflation gas IG discharged from the first central orifice MO11 is more likely to flow into the rear auxiliary chamber SC1 along the end 112Ba of the convex second non-inflatable portion 112B. That is, the pressure of the front main chamber MC2 is further reduced. Therefore, the load applied to the partition non-inflatable portion 112S is reduced, thereby reducing the stress generated in the partition non-inflatable portion 112S.

[0085] B2. Alternative embodiment 2: (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 moving body other than a vehicle MV. For example, the curtain airbag device 100 may be mounted on a moving body other than a vehicle MV, such as an airplane or a ship. (2) In the above embodiment, the inflatable portions such as the various main chambers and various sub-chambers are surrounded by a plurality of non-inflatable portions 112. However, the inflatable portions may be surrounded by one non-inflatable portion 112. For example, the inflatable portions may be configured by being surrounded by one arc-shaped non-inflatable portion 112 inside the bag body 110. (3) In the above embodiment, the bag body 110 has one communication passage MC1 that communicates the front main chamber MC2 and the front auxiliary chamber SC2. However, the bag body 110 may have a plurality of communication passages MC1. Furthermore, the communication passage MC1 may not function as an inflatable portion like the central main chamber MC1. For example, the front end portion 112Sb of the partition non-inflatable portion 112S may not be connected to the peripheral non-inflatable portion 112o, so that the front main chamber MC2 and the front auxiliary chamber SC2 may communicate with each other without an inflatable portion. That is, the front auxiliary chamber may have two openings. More specifically, the bag body 110 may be provided with two front auxiliary chamber orifices that function as openings of the front auxiliary chamber SC2, and each of them may function as a communication passage MC1. (4) In the above embodiment, the partition non-inflatable portion 112S does not have to include the arc-shaped portion 112Sa2 or the branched portion 112Sa1 at the rear end portion 112Sa. For example, the rear end portion 112Sa may be a single non-inflatable portion 112 curved in an arc shape. (5) In the above embodiment, the width Wc1 of the first front main chamber orifice CO1 is larger than the width Ws2 of the front auxiliary chamber orifice SO2. However, the width Wc1 of the first front main chamber orifice CO1 does not have to be larger than the width Ws2 of the front auxiliary chamber orifice SO2. For example, the width Wc1 of the first front main chamber orifice CO1 may be the same as the width Ws2 of the front auxiliary chamber orifice SO2. (6) In the above embodiment, the width Wc2 of the second front main chamber orifice MO2 is larger than the width Wc1 of the first front main chamber orifice CO1. However, the width Wc2 of the second front main chamber orifice MO2 does not have to be larger than the width Wc1 of the first front main chamber orifice CO1. For example, the width Wc2 of the second front main chamber orifice MO2 may be the same as the width Wc1 of the first front main chamber orifice CO1. (7) In the above embodiment, the first non-inflatable 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-inflatable 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. (8) In the above embodiment, the bag body 110 includes the central main chamber orifice MO12 as an opening of the central main chamber MC1. However, the bag body 110 does not necessarily have to include the central main chamber orifice MO12. In other words, the bag body 110 may include only the front auxiliary chamber orifice SO2 and the first front main chamber orifice CO1 as openings of the central main chamber MC1. (9) In the above embodiment, the bag body 110 may not include the rear main chamber MC3 or the rear auxiliary chamber SC1. For example, the bag body 110 may include only the front main chamber MC2 and the front auxiliary chamber SC2. More specifically, the curtain airbag device 100 is mounted on a vehicle MV with only one row of seats, and thus protects only the protected object PO1, so that the bag body 110 includes only the front main chamber MC2 and the front auxiliary chamber SC2. (10) In the above embodiment, the bag body 110 does not have to include the second central orifice SO11. For example, in the bag body 110, the end portion of the third non-inflatable portion 112C may be provided at the position of the fourth non-inflatable portion 112D, so that the rear auxiliary chamber orifice SO12 functions as the rear orifice CO2.

[0086] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features of the embodiments corresponding to the technical features in each form described in the summary of the present disclosure can be appropriately replaced or combined in order to solve some or all of the above problems or to achieve some or all of the above effects. Furthermore, if the technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0087] 100...curtain airbag device, 110...bag body, 112...non-inflatable portion, 112A...first non-inflatable portion, 112B...second non-inflatable portion, 112Ba...end of second non-inflatable portion, 112C...third non-inflatable portion, 112D...fourth non-inflatable portion, 112S...compartment non-inflatable portion, 112Sa...rear end portion, 112Sa1...branch portion, 112Sa2...arc-shaped portion, 112Sb...front end portion, 112 Sc...central portion, 112o...peripheral non-inflatable portion, 120...inner tube, 121...opening for central main chamber, 122...opening for front main chamber, 123...opening for rear main chamber, 126...opening for rear auxiliary chamber, 130...inflator, A1...range, BD...rear direction, CO1...first front main chamber orifice, CO2...rear orifice, DD...downward direction, FD...forward direction, Fm1...direction of flow path, I G...inflation gas, IM...impactor, LD...left direction, MC3...rear main chamber, MC1...central main chamber, MC2...front main chamber, MO11...first central orifice, MO12...central main chamber orifice, MO2...second front main chamber orifice, MV...vehicle, MVd1...front door, MVd2...rear door, MVp1...A pillar, MVp2...B pillar, MVp3...C pillar, MVw1...front side window, MVw2...rear side window, OD...downward, PO,PO1,PO2...protected object, SC1...rear auxiliary chamber, SC2...front auxiliary chamber, SO11...second central orifice, SO12...rear auxiliary chamber orifice, SO2...front auxiliary chamber orifice, SP...main body opening, UD...upward, Vd...vertical direction, Wc1,Wc2,Wm1,Ws2...width, Wd...width direction

Claims

1. A curtain airbag device for a moving object, comprising: The bag body is inflated and deployed by being supplied with inflation gas, The bag body includes: A plurality of non-inflatable portions as portions where the fabric constituting the bag body is joined; an expansion chamber and an auxiliary chamber as expansion sections each surrounded by one or more of the non-expansion sections; a plurality of orifices for communicating inflation gas received in the expansion chamber or the subchamber; one or more communication passages communicating the expansion chamber and the sub-chamber, The expansion chamber is supplied with an expansion gas and expands to cushion an impact on a protected object caused by contact with the protected object within the movable body, The sub-chamber receives inflation gas to adjust the manner in which the expansion chamber expands, the plurality of orifices includes one or more sub-chamber orifices communicating with the communication flow passage, The plurality of non-inflatable portions include partition non-inflatable portions that partition the expansion chamber and the auxiliary chamber, the partition non-inflatable portion being longer than a width of the auxiliary chamber orifice.

2. 2. The curtain airbag device according to claim 1, The non-expanding section further includes, at an end of the non-expanding section, A branching portion that branches into two branches, and an arc-shaped portion connecting the respective ends of the branch portions.

3. 3. The curtain airbag device according to claim 2, The sub-chamber has only one opening, The auxiliary chamber orifice is configured to function as an opening of the auxiliary chamber.

4. 4. The curtain airbag device according to claim 3, The communication passage is disposed rearward of the expansion chamber and configured to function as the expansion portion.

5. 5. The curtain airbag device according to claim 4, The bag body further includes: Among the plurality of orifices, a first expansion chamber orifice is provided as an opening of the expansion chamber, the first expansion chamber orifice being in communication with the communication flow passage; A curtain airbag device, wherein the width of the first expansion chamber orifice is greater than the width of the sub-chamber orifice.

6. 6. The curtain airbag device according to claim 5, The bag body further includes: a first non-expansion portion among the plurality of non-expansion portions that partially separates the communication flow passage as the expansion portion from the expansion chamber; a main body opening through which inflation gas is supplied; a second expansion chamber orifice, among the plurality of orifices, communicating with the main body opening, the second expansion chamber orifice being partially defined by the first non-expandable portion; A curtain airbag device, wherein the width of the second expansion chamber orifice is greater than the width of the first expansion chamber orifice.

7. 7. The curtain airbag device according to claim 6, The main body opening is an innermost part of a flow path connecting the outside and the inside of the bag body in the bag body, and is defined by a non-inflatable portion on the outside of the bag body, The first non-inflatable portion has a shape such that a dimension along a width direction of the main body opening is larger than a dimension along a direction perpendicular to the width direction.

8. The curtain airbag device according to claim 7, the bag body further includes, among the plurality of orifices, an orifice other than the first expansion chamber orifice and the sub-chamber orifice as an opening of the communication flow passage as the expansion portion, The other orifice communicates with the main body opening.

9. The curtain airbag device according to claim 8, The communication flow passage as the expansion portion reduces an impact on the protected object caused by contact with the protected object, The bag body further includes: an additional sub-chamber for receiving inflation gas to adjust the manner of inflation in the communication passage as the inflation portion; a central orifice disposed at a position facing the main body opening and discharging inflation gas to the communication passage as the inflation portion and to the additional sub-chamber; a second non-expansion portion among the plurality of non-expansion portions that partially separates the communication flow passage as the expansion portion from the additional sub-chamber, a curtain airbag device, wherein an end of the second non-inflatable portion defines the narrowest portion of the other orifice and is disposed within a width range of the central orifice when viewed along a direction of a flow path of inflation gas flowing through the central orifice.

10. The curtain airbag device according to claim 9, A curtain airbag device, wherein an end of the second non-inflatable portion is formed in a convex shape toward the first non-inflatable portion.

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