Curtain airbag device, airbag case, and movable body

Abstract

To provide an art which inhibits misalignment of an attachment position of a curtain airbag while reducing labor for a step in which a curtain airbag is attached to a holding part.SOLUTION: A curtain airbag device for a movable body includes: a bag body which is supplied with an expansion gas to be inflated and deployed; and a first engagement part fixed to the bag body. The first engagement part is configured to be engageable with a second engagement part which is provided at a holding part for holding the bag body.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a curtain airbag device, an airbag case, and a moving body. [Background technology]

[0002] Regarding a curtain airbag device for a moving body, Patent Document 1 discloses a technique for attaching a curtain airbag by wrapping a tape-like material around a bracket attached to the vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-151176 Summary of the Invention [Problem to be solved by the invention]

[0004] The above document does not specifically consider how to properly position a curtain airbag when installing it. For example, it is time-consuming to hold the curtain airbag so that it does not shift relative to the installation target and to secure the curtain airbag with a tape-like material. Furthermore, there is a risk that the installation position of the curtain airbag will shift depending on the worker performing this work. The shift in the installation position may cause a shift in the position or direction in which the curtain airbag is deployed, which may affect the protective performance of the curtain airbag. Therefore, there is a need for a technology that can reduce the effort required in the installation process of the curtain airbag while preventing the installation position of the curtain airbag from shifting. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms.

[0006] (1) According to a first aspect of the present disclosure, there is provided a curtain airbag device for a vehicle. The curtain airbag device includes a bag body that is inflated and deployed by being supplied with inflation gas, and a first engagement portion fixed to the bag body. The first engagement portion is configured to be engageable with a second engagement portion provided on a holding portion that holds the bag body. According to this aspect, the bag body can be attached to the holding part by engaging the first engaging part with the second engaging part, which reduces the effort required for attaching the bag body to the holding part and also reduces misalignment of the attachment position of the bag body relative to the holding part. (2) In the above embodiment, the first engagement portion may be sewn to the bag body. According to this embodiment, the first engagement portion can be firmly fixed to the bag body in a space-saving manner. (3) In the above aspect, the bag may further include a band-shaped member for maintaining the bag body in a folded state, the band-shaped member being configured to break when the bag body inflates and unfolds, the first engagement portion having a protruding portion protruding in a direction opposite to the unfolding direction of the bag body, the band-shaped member having a first through-hole at a first position of the band-shaped member and a second through-hole at a second position of the band-shaped member, the first position and the second position respectively representing positions in the longitudinal direction of the band-shaped member, and the band-shaped member being wrapped around the folded bag body from the first position to the second position such that the protruding portions are disposed within the first through-hole and the second through-hole. According to this aspect, the folded state can be maintained by the band-shaped member using the protruding portion of the first engagement portion. (4) In the above embodiment, the belt-shaped member may be made of a nonwoven fabric. According to this embodiment, the belt-shaped member can be easily formed. (5) In the above embodiment, the bag body may have a receiving portion for receiving the inflation gas from the inflator, and the first engaging portion may include one engaging portion and another engaging portion, and the one engaging portion and the other engaging portion may be arranged so that the receiving portion is located between the one engaging portion and the other engaging portion in the longitudinal direction of the bag body folded into a long shape. According to this embodiment, it is possible to reduce the effort in the installation process caused by the weight of the inflator, which is a relatively heavy component. (6) In the above aspect, the first engagement portion may have a fitting portion that can fit into a fitting hole provided in the second engagement portion. According to this aspect, it is possible to further reduce the effort required in the process of attaching the bag body to the holding portion. (7) According to a second aspect of the present disclosure, there is provided an airbag case, the airbag case comprising: a bag body included in a curtain airbag device for a vehicle, the bag body being inflated and deployed by being supplied with inflation gas; a storage section for storing the bag body in a folded state; and a second engaging section fixed to the storage section, the second engaging section being configured to be engageable with a first engaging section fixed to the bag body. (8) According to a third aspect of the present disclosure, there is provided a moving body to which a curtain airbag device is attached, the moving body including: a moving body main body; and a second engaging portion configured to be engageable with a first engaging portion fixed to a bag main body of the curtain airbag device, the second engaging portion being fixed to the moving body main body. In addition to the above-described curtain airbag device, airbag case, and moving body, the present disclosure can be realized in various forms, such as a method for manufacturing a curtain airbag device and a method for manufacturing a moving body. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is an explanatory diagram of a curtain airbag device. [Figure 2] FIG. 3 is an exploded perspective view showing a first engagement portion and a second engagement portion. [Figure 3]10A and 10B are diagrams illustrating how a belt-shaped member is attached to a bag body. [Figure 4] 10 is a flowchart showing a method for attaching the bag body to the holding portion. [Figure 5] 10A and 10B are diagrams illustrating a holding portion in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] A. First embodiment: A1. Curtain airbag system configuration: Fig. 1 is an explanatory diagram of a curtain airbag device 100 for a moving body in a first embodiment. Fig. 1 shows the right curtain airbag device 100 of a pair of left and right curtain airbag devices 100 attached to a vehicle 200 as a moving body. "Left and right" in this disclosure refer to the left and right when the vehicle 200 is viewed from the rear side to the front side of the vehicle 200. The left and right direction in this disclosure corresponds to the vehicle width direction.

[0009] The curtain airbag device 100 includes a bag body 110, an inflator 130, a case 150, and a first engagement portion 160. The curtain airbag device 100 in this embodiment further includes a second engagement portion 170 and a belt-shaped member 180. The case 150 is also referred to as an airbag case.

[0010] When the curtain airbag device 100 is activated, the bag body 110 is inflated and deployed by being supplied with inflation gas from the inflator 130. The state in which the bag body 110 is deployed is also referred to as the deployed state. The bag body 110 has a bag-like configuration with a substantially rectangular outer shape. In this embodiment, the bag body 110 is formed by a so-called one-piece woven method (OPW) and is configured as a one-piece bag body woven by an automatic loom. The bag body 110 is made of polyethylene terephthalate and is coated with a resin. Note that in other embodiments, the bag body 110 may be formed by a method other than OPW, for example, by layering and sewing multiple pieces of cloth together.

[0011] The bag body 110 is normally in a folded state when the curtain airbag device 100 is not activated. The folded state refers to a state in which the bag body 110 is folded, i.e., a state in which the bag body 110 is not deployed. FIG. 1 shows the bag body 110f in a folded state and the bag body 110t in an deployed state. Specifically, as indicated by the arrow Af in FIG. 1, the bag body 110 assumes the folded state by rolling up a portion including the lower end from the deployed state and folding the other portion including the upper end in a zigzag pattern. The bag body 110f in the folded state has an elongated shape that intersects with a first direction D1 of the bag body 110f. The first direction D1 represents the direction in which the bag body 110 deploys. In this embodiment, the first direction D1 is a vertically downward direction. The first direction D1 is also referred to as the "deployment direction of the bag body 110" or the "deployment direction." The longitudinal direction of the bag body 110f is also simply referred to as the "longitudinal direction."

[0012] The opposite direction of the first direction D1, i.e., the opposite direction to the deployment direction, is also referred to as the second direction D2. In this embodiment, the second direction D2 is the vertically upward direction. The direction from the first surface Sr1 to the second surface Sr2 of the deployed bag main body 110t is also referred to as the third direction D3. The first surface Sr1 is the surface of the bag main body 110t facing the passenger compartment. The second surface Sr2 is the surface opposite to the first surface Sr1. The direction from the second surface Sr2 to the first surface Sr1 of the deployed bag main body 110t, i.e., the opposite direction to the third direction D3, is also referred to as the fourth direction D4. The third direction D3 and the fourth direction D4 are perpendicular to the first direction D1 and the second direction D2, respectively. Note that in this disclosure, perpendicular includes a range of 90°±10°.

[0013] The bag body 110 includes a receiving portion 116. The receiving portion 116 functions as an inlet for inflation gas into the bag body 110, and receives inflation gas from the inflator 130. The receiving portion 116 is a cylindrical portion that protrudes rearward and upward from the upper side of the bag body 110t, which has a generally rectangular outer shape. The receiving portion 116, which is part of the bag body 110, is configured by forming a portion of the fabric that makes up the bag body 110 into a cylindrical shape. A tip portion 131 of the inflator 130 is inserted into the receiving portion 116.

[0014] The inflator 130 has a function of inflating the bag body 110. The inflator 130 has a substantially cylindrical shape. A tip portion 131 of the inflator 130 is inserted into the receiving portion 116 of the bag body 110. The inflator 130 receives a signal from a control unit (not shown) of the vehicle 200 and ejects inflation gas from the tip portion 131. The inflator 130 may be fixed to the vehicle body 201 of the vehicle 200 via a fastener (not shown) such as a bolt or a screw. The vehicle body 201 corresponds to the "vehicle body" in this disclosure.

[0015] Case 150 accommodates bag body 110f in a folded state. Case 150 in this embodiment includes first case 151, second case 152, and third case 153. First case 151, second case 152, and third case 153 are arranged in this order along the front-to-rear direction of vehicle 200. Hereinafter, when first case 151, second case 152, and third case 153 are not to be distinguished from one another, they will each be simply referred to as case 150.

[0016] The case 150 in this embodiment corresponds to the "holding portion" in the present disclosure. The holding portion is used to hold the bag body 110. The bag body 110 is attached to the holding portion, and thereby the holding portion holds the bag body 110. Note that, to facilitate understanding of the technology, FIG. 1 shows a state in which the bag body 110f is not held by the case 150, that is, a state in which the case 150 and the bag body 110f are separated.

[0017] In this embodiment, case 150 has an axis that follows the elongated bag main body 110f and has a substantially semicircular cross-sectional shape. Case 150 has a storage section 154 for storing bag main body 110f in a folded state. In this embodiment, a recessed portion of case 150 with a substantially semicircular cross-sectional shape corresponds to storage section 154. That is, bag main body 110 folded into an elongated shape is stored in the recessed portion that serves as storage section 154.

[0018] The bag body 110 and the case 150 are fixed to the vehicle body 201 of the vehicle 200 so that the bag body 110 is deployed in the passenger compartment of the vehicle 200 when the curtain airbag device 100 is activated. The bag body 110 may be fixed to the vehicle body 201 via the case 150, for example. Alternatively, the bag body 110 itself may be fixed to the vehicle body 201 via a fixing device, for example. The case 150 may be fixed to the vehicle body 201 via the bag body 110, for example. Alternatively, the case 150 itself may be fixed to the vehicle body 201 via a fixing device, for example.

[0019] The first engagement portion 160 is fixed to the bag body 110. The first engagement portion 160 is configured to be able to engage with the second engagement portion 170. It can also be said that the second engagement portion 170 is configured to be able to engage with the first engagement portion 160. In this disclosure, "engagement" includes "fitting." The second engagement portion 170 is fixed to the holding portion. That is, in this embodiment, the second engagement portion 170 is provided on the case 150.

[0020] In this embodiment, the bag body 110 is provided with four first engagement portions 160. The case 150 is provided with four second engagement portions 170 corresponding to the four first engagement portions 160. When the bag body 110 is attached to the case 150, i.e., when the bag body 110 is held in the case 150, each first engagement portion 160 engages with a corresponding second engagement portion 170. In FIG. 1, the correspondence between each first engagement portion 160 and each second engagement portion 170 is indicated by a two-dot chain line. As shown in FIG. 1, in this embodiment, the first engagement portion 160A and the first engagement portion 160B are arranged such that the receiving portion 116 is located between the first engagement portion 160A and the first engagement portion 160B in the longitudinal direction. As a result, at least a portion of the inflator 130 is located between the first engagement portion 160A and the first engagement portion 160B in the longitudinal direction. The first engagement portion 160A corresponds to one of the plurality of first engagement portions 160. The first engagement portion 160B corresponds to another of the plurality of first engagement portions 160 that is different from the first engagement portion 160A.

[0021] 2 is an exploded perspective view showing the first engagement portion 160 and the second engagement portion 170 in the first embodiment. In this embodiment, the first engagement portion 160 is configured to be able to fit into a fitting hole 179 of the second engagement portion 170. Specifically, the first engagement portion 160 is configured as a resin clip member that can be fitted into the fitting hole 179 by snap-fitting. The first engagement portion 160 has a first base portion 161, a protrusion 165, and a fitting portion 166.

[0022] The first base portion 161 has a flat plate shape. The first base portion 161 is disposed on the second direction D2 side of the first direction D1 with respect to the bag body 110, i.e., on the upper side of the bag body 110. The first base portion 161 is disposed so that the thickness direction of the first base portion 161 is along the first direction D1. When viewed in the thickness direction of the first base portion 161, the first base portion 161 has a longitudinal direction and a lateral direction. The first base portion 161 is disposed so that the longitudinal direction of the first base portion 161 is along the elongated bag body 110f.

[0023] The first base portion 161 has two end portions 163 and a central portion 164. The end portions 163 constitute the longitudinal ends of the first base portion 161. The central portion 164 constitutes the portion of the first base portion 161 located between the two end portions 163. Each end portion 163 is provided with a fastening hole 162 penetrating the first base portion 161 in the thickness direction. In this embodiment, each end portion 163 is provided with two fastening holes 162. The first engaging portion 160 is sewn to the upper end surface Up of the bag main body 110 through each fastening hole 162 of the first base portion 161. That is, the first engaging portion 160 is fixed to the bag main body 110 through the fastening holes 162 with thread Th. Specifically, each end portion 163 is sewn to the upper end surface Up through a pair of fastening holes 162 provided in each end portion 163. In FIG. 2, the thread Th is schematically shown by hatching.

[0024] The first base portion 161 in this embodiment is provided with a pressing portion 168. In FIG. 2, the pressing portion 168 is schematically indicated by a dashed line. The pressing portion 168 has a first portion 168a and a second portion 168b. The first portion 168a extends in the fourth direction D4 from an upper end of a surface Sr3 of the first base portion 161 on the fourth direction D4 side. The first portion 168a has a flat plate shape and is disposed so that the plate surface of the first portion 168a is perpendicular to the first direction D1 and the second direction D2. The second portion 168b extends in the first direction D1 from an end of the first portion 168a on the fourth direction D4 side. The second portion 168b has a flat plate shape and is disposed so that the plate surface of the second portion 168b is perpendicular to the third direction D3 and the fourth direction D4. A gap Gp is ​​formed between the first base portion 161 and the second portion 168b. The gap Gp is ​​the gap between the surface Sr3 and the surface Sr4. The surface Sr4 is the surface of the second portion 168b on the third direction D3 side.

[0025] The protruding portion 165 is a portion that protrudes from the bag body 110 in the second direction D2, i.e., upward. In this embodiment, the protruding portion 165 is configured as a portion that stands in the second direction D2 from the center portion 164 of the first base portion 161. Therefore, the protruding portion 165 is located between the two end portions 163 in the longitudinal direction of the first base portion 161. The protruding portion 165 has a flat plate shape. The protruding portion 165 is arranged so that the plate surface of the protruding portion 165 is perpendicular to the third direction D3 and the fourth direction D4.

[0026] The fitting portion 166 is a portion configured to be able to fit into the fitting hole 179. In this embodiment, the fitting portion 166 is configured as a portion that protrudes in the third direction D3 from the upper end of the protruding portion 165. The fitting portion 166 is fitted into the fitting hole 179 by snap fitting.

[0027] The second engagement portion 170 is configured as a resin holder. The second engagement portion 170 is fixed to the second direction D2 side of the accommodation portion 154, i.e., to the upper side of the accommodation portion 154. The second engagement portion 170 has a second base portion 171 and a receiving portion 175. The second base portion 171 has a flat plate shape and is disposed so that the thickness direction of the second base portion 171 is along the first direction D1. The receiving portion 175 is a portion that receives the fitting portion 166. The receiving portion 175 is configured as a recess that is recessed in the third direction D3 and has an opening Op that opens toward the fourth direction D4. The above-mentioned fitting hole 179 is provided in a bottom portion 176 of the opening Op of the receiving portion 175. With this configuration, the receiving portion 175 can receive the fitting portion 166 within the opening Op and can fit the fitting portion 166 into the fitting hole 179.

[0028] The belt-shaped member 180 has a long belt shape. The belt-shaped member 180 is a member for maintaining the folded state under normal circumstances. The belt-shaped member 180 is configured to break when the bag main body 110 inflates and unfolds. The belt-shaped member 180 maintains the folded state by being wrapped around the folded bag main body 110f. In this embodiment, the belt-shaped member 180 is made of nonwoven fabric.

[0029] Fig. 3 is a diagram illustrating how the belt-shaped member 180 is attached to the bag body 110f. The steps shown in Fig. 3 correspond to at least a part of the manufacturing method for the curtain airbag device 100 in this embodiment.

[0030] In step S10, the bag body 110 to which the first engagement portion 160 is fixed and the belt-shaped member 180 are prepared.

[0031] 2 shows the belt-shaped member 180 attached to the bag main body 110f, whereas step S10 in FIG. 3 shows the belt-shaped member 180 before being attached to the bag main body 110. As shown in FIGS. 2 and 3, the belt-shaped member 180 has a first through-hole 181 and a second through-hole 182. The first through-hole 181 is provided at a first position P1 of the belt-shaped member 180. The second through-hole 182 is provided at a second position P2 of the belt-shaped member 180. The first position P1 and the second position P2 each represent positions in the longitudinal direction DL of the belt-shaped member 180. In this embodiment, the first position P1 is located at a first end 183 of the belt-shaped member 180 in the longitudinal direction DL. The second position P2 is located at a second end 184 of the belt-shaped member 180 in the longitudinal direction DL. The first through-hole 181 and the second through-hole 182 each penetrate the strip-shaped member 180 in the thickness direction of the strip-shaped member 180.

[0032] As shown in FIG. 3 , in this embodiment, the first through hole 181 and the second through hole 182 each have a substantially triangular opening shape. Specifically, the opening shape of each through hole is a substantially triangular shape in which the opening width at the center of the longitudinal direction DL of each through hole is wider than the opening width at both ends of the through hole in the longitudinal direction DL. The opening width refers to the opening diameter in the short direction DS of the strip-shaped member 180. More specifically, the opening shape of the first through hole 181 is a triangle in which the center of the first through hole 181 in the longitudinal direction DL protrudes toward the second through hole 182. The opening shape of the second through hole 182 is a triangle that faces in the opposite direction to the first through hole 181 in the longitudinal direction DL. Hereinafter, the vertex of the portion of the opening shape of the first through hole 181 that protrudes toward the second through hole 182 will also be referred to as a vertex portion Tp. The vertex portion Tp is defined by a vertex edge portion 185 of the strip-shaped member 180.

[0033] In step S20, the protruding portion 165 of the first engaging portion 160 is placed in the first through-hole 181 of the belt-shaped member 180. Specifically, the fitting portion 166 and the protruding portion 165 are inserted into the first through-hole 181, thereby placing the lower end of the protruding portion 165 in the first through-hole 181.

[0034] In step S30, the belt-shaped member 180 is wound around the bag main body 110f, and the protrusion 165 is placed in the second through-hole 182 of the belt-shaped member 180. Specifically, while maintaining the state in which the protrusion 165 is placed in the first through-hole 181 and the folded state of the bag main body 110f, the belt-shaped member 180 is wound around the bag main body 110f, and the fitting portion 166 and the protrusion 165 are inserted into the second through-hole 182. Figure 3 shows a state S30A in which the belt-shaped member 180 is being wound, and a state S30B in which the winding of the belt-shaped member 180 is completed.

[0035] In this embodiment, in either step S20 or step S30, the apex edge 185 of the strip-shaped member 180 is placed in the gap Gp between the surface Sr3 of the central portion 164 and the surface Sr4 of the pressing portion 168. Figure 3 shows an example in which the apex edge 185 is placed in the gap Gp in step S30.

[0036] By performing steps S10 to S30, the belt-shaped member 180 is wound around the bag main body 110f from the first position P1 to the second position P2 of the belt-shaped member 180 so that the protrusions 165 are disposed within the first through-hole 181 and the second through-hole 182. Specifically, the belt-shaped member 180 is wound around the bag main body 110f from the first end 183 to the second end 184. As a result, the belt-shaped member 180 is attached to the bag main body 110f as shown in FIG. 2. When the belt-shaped member 180 is attached to the bag main body 110f as shown in FIG. 2, the second end 184 and the first end 183 are vertically overlapped, and the second through-hole 182 and the first through-hole 181 are vertically connected to each other. Specifically, in FIG. 2, the first end 183 and the first through-hole 181 are located below the second end 184 and the second through-hole 182.

[0037] As described above, the belt-shaped member 180 is configured to break upon activation. Specifically, upon activation, inflation gas is supplied from the inflator 130 to the bag main body 110f, which initiates inflation and deployment of the bag main body 110f. As a result, an external force is applied to the wound belt-shaped member 180 from the inside, i.e., the bag main body 110 side, causing the belt-shaped member 180 to break. In this case, for example, portions of the belt-shaped member 180 near the first through hole 181 and the second through hole 182, which are relatively weaker than other portions, break preferentially. It is preferable to select the dimensions, thickness, material, and fiber density of the belt-shaped member 180, as well as the opening diameter, opening area, and opening shape of the first through hole 181 and the second through hole 182, so that the belt-shaped member 180 breaks appropriately upon activation and so that the belt-shaped member 180 can properly maintain the folded state of the bag main body 110f under normal conditions.

[0038] A2. Attaching the bag body to the holder: Fig. 4 is a flowchart showing a method for attaching the bag body 110 to the holding part. The steps shown in Fig. 4 correspond to at least a part of the method for manufacturing the curtain airbag device 100 in this embodiment.

[0039] In step S100, the bag body 110f and the holding portion are prepared. In step S100 in this embodiment, the bag body 110f is prepared as the bag body 110f in the state in which step S30 in Fig. 3 is completed. Furthermore, each case 150 is prepared as the holding portion.

[0040] In step S110, the bag body 110f is inserted into the storage portion 154 of each case 150, and each first engagement portion 160 is engaged with each second engagement portion 170. That is, in step S110, the bag body 110f is inserted into each storage portion 154, and the fitting portion 166 of each first engagement portion 160 is fitted into the fitting hole 179 of each second engagement portion 170. As a result, the bag body 110 is attached to the case 150. The process of attaching the bag body 110 to the holding portion, as in step S110, is also referred to as an attachment process. After completion of step S110, for example, at least one of the bag body 110 and each case 150 accommodating the bag body 110 is fixed to the vehicle body 201 via various fasteners.

[0041] The curtain airbag device 100 in the first embodiment described above includes the first engagement portion 160 fixed to the bag body 110. The first engagement portion 160 is configured to be engageable with the second engagement portion 170 of the case 150, which serves as a retaining portion. In this manner, the bag body 110f can be attached to the case 150 by engagement between the first engagement portion 160 and the second engagement portion 170. Therefore, compared to, for example, a case in which the bag body 110f is fixed to the case 150 using tape while adjusting the relative position of the bag body 110f with respect to the case 150, it is possible to reduce the effort required in the attachment process and to prevent misalignment of the attachment position of the bag body 110 with respect to the case 150. Furthermore, it is possible to reduce the effort required in the attachment process and to prevent misalignment of the attachment position of the bag body 110 with respect to the case 150, compared to a case in which the bag body 110f is attached to the case 150 using fasteners such as bolts or screws. In this way, it is possible to reduce the effort required in the attachment process and to prevent misalignment of the attachment position of the bag body 110 with respect to the case 150.

[0042] Furthermore, in this embodiment, the first engagement portion 160 is sewn to the bag body 110. Therefore, the first engagement portion 160 can be firmly fixed to the bag body 110 in a space-saving manner. Specifically, compared to a configuration in which the first engagement portion 160 is fixed to the bag body 110 via a fastener such as a bolt or a screw, the first engagement portion 160 can be fixed to the bag body 110 in a space-saving manner. Furthermore, the first engagement portion 160 can be fixed to the bag body 110 without using adhesive.

[0043] In this embodiment, a belt-shaped member 180 is provided. The belt-shaped member 180 is wrapped around the folded bag main body 110f from the first position P1 to the second position P2 so that the protrusions 165 are disposed within the first through-holes 181 and the second through-holes 182. Therefore, the folded state can be maintained by the belt-shaped member 180, utilizing the protrusions 165 of the first engagement portion 160.

[0044] In the present embodiment, the first engaging portion 160 has a retaining portion 168. A portion of the belt-shaped member 180 is disposed in the gap Gp between the retaining portion 168 and the first base portion 161. This prevents the belt-shaped member 180 from unintentionally unwinding, for example, during normal operation or while the belt-shaped member 180 is being attached. In the present embodiment, the first through-hole 181 has the apex Tp, which allows a portion of the belt-shaped member 180 to be more smoothly disposed in the gap Gp than in a configuration in which the first through-hole 181 does not have the apex Tp. Specifically, the apex edge 185 can be smoothly disposed in the gap Gp. Furthermore, when an external force is applied to the belt-shaped member 180 from the bag main body 110 during deployment of the bag main body 110, a crack originating from the apex Tp can be generated in the belt-shaped member 180. This makes it easier to properly break the belt-shaped member 180 when the curtain airbag device 100 is activated.

[0045] In this embodiment, the belt-shaped member 180 is made of nonwoven fabric. This allows for a simple configuration of the belt-shaped member 180. Specifically, it is possible to easily configure the belt-shaped member 180 so that it remains folded under normal conditions and breaks when activated.

[0046] Furthermore, in this embodiment, the receiving portion 116 is disposed in the longitudinal direction between a first engaging portion 160A, which is one engaging portion, and a first engaging portion 160B, which is another engaging portion different from the first engaging portion 160A. As a result, at least a portion of the inflator 130, which is a relatively heavy member, is disposed in the longitudinal direction between the first engaging portion 160A and the first engaging portion 160B. Therefore, compared to a configuration in which the receiving portion 116 is not disposed between the first engaging portions 160, the effort required in the attachment process due to the weight of the inflator 130 can be reduced.

[0047] Furthermore, in this embodiment, the first engagement portion 160 has a fitting portion 166 that can fit into a fitting hole 179 provided in the second engagement portion 170. Therefore, the bag main body 110f can be attached to the case 150 by fitting the fitting portion 166 into the fitting hole 179. This further reduces the effort required for the attachment process.

[0048] Furthermore, in the case 150 of this embodiment, the second engagement portion 170 is fixed to the accommodation portion 154. Therefore, it is possible to provide a case 150 that can reduce the effort required in the attachment process and prevent misalignment of the attachment position.

[0049] B. Second embodiment: 5 is a diagram illustrating a curtain airbag device 100b and a retaining portion in the second embodiment. In this embodiment, unlike the first embodiment, the curtain airbag device 100b does not include a case 150. Also, in this embodiment, a vehicle 200b functions as the retaining portion in the present disclosure. Of the configurations of the curtain airbag device 100b and the vehicle 200b in the second embodiment, those points that are not particularly described are the same as those in the first embodiment.

[0050] In this embodiment, the second engagement portions 170 are fixed to a vehicle body 201b of the vehicle 200b. In this embodiment, the first engagement portions 160 of the curtain airbag device 100b are engaged with the second engagement portions 170 of the vehicle 200, whereby the curtain airbag device 100b is attached to the vehicle 200b as a holding portion.

[0051] The curtain airbag device 100b in the second embodiment described above can also reduce the effort required for the installation process and prevent the bag body 110 from shifting from its installation position. In the vehicle 200b in this embodiment, the second engagement portion 170 is fixed to the vehicle body 201b. Therefore, it is possible to provide a vehicle 200b that can reduce the effort required for the installation process and prevent the bag body 110 from shifting from its installation position.

[0052] Furthermore, in this embodiment, when desired, the curtain airbag device 100b can be easily removed from the vehicle body 201b by releasing the engagement between the first engagement portion 160 and the second engagement portion 170. This makes it easy to replace, inspect, or repair the curtain airbag device 100b, improving the maintainability of the curtain airbag device 100b.

[0053] C. Other Embodiments: (C1) In the above embodiments, the first engagement portion 160 is sewn to the bag body 110. However, the first engagement portion 160 may be fixed to the bag body 110 by various methods other than sewing. For example, the first engagement portion 160 may be fixed to the bag body 110 using various fasteners or adhesive.

[0054] (C2) In each of the above embodiments, the curtain airbag device 100 does not have to include the belt-shaped member 180. For example, the folded state of the curtain airbag device 100 may be maintained by a belt-shaped member different from the belt-shaped member 180, a string-shaped member, or a fastener in addition to or instead of the belt-shaped member 180.

[0055] (C3) In the above embodiments, the belt-shaped member 180 is made of nonwoven fabric, but it does not have to be made of nonwoven fabric. For example, the belt-shaped member 180 may be made of various materials such as paper, metal, resin, or woven fabric.

[0056] (C4) In the above embodiments, the first engagement portion 160 has the fitting portion 166, but it does not have to have the fitting portion 166. For example, the second engagement portion 170 may have a fitting portion, and the first engagement portion 160 may have a fitting hole into which the fitting portion provided in the second engagement portion 170 can fit. Furthermore, the first engagement portion 160 may be configured to be able to engage with the second engagement portion 170 in a manner other than fitting. For example, the first engagement portion 160 may be configured to be able to engage with the second engagement portion 170 by sliding movement.

[0057] (C5) In the above embodiments, examples have been shown in which the number of first engagement portions 160 and the number of second engagement portions 170 are four. However, the number of first engagement portions 160 and the number of second engagement portions 170 may be three or less, or five or more. Furthermore, the arrangement of each first engagement portion 160 and each second engagement portion 170 may be arbitrary as long as the bag body 110 can be held by the holding portion.

[0058] (C6) In each of the above embodiments, the second engagement portion 170 may be fixed to the holding portion by being formed integrally with the holding portion. For example, in the first embodiment, the second engagement portion 170 may be fixed to the accommodating portion 154 by being formed integrally with the accommodating portion 154. Furthermore, in the second embodiment, the second engagement portion 170 may be fixed to the vehicle body 201b by being formed integrally with the vehicle body 201b.

[0059] (C7) In the above embodiments, the vehicle 200 is shown as an example of a moving body. However, the moving body is not limited to the vehicle 200 and may be various moving bodies. For example, the moving body may be various moving bodies on which a passenger can board, such as a ship, an airplane, a spaceship, or a so-called flying car.

[0060] (C8) In the above embodiments, an airbag case and a moving body are shown as examples of the holding part. However, the holding part is not limited to an airbag case or a moving body, and may be configured as various holding parts for holding the bag body 110.

[0061] The present disclosure is not limited to the above-described embodiments and can be realized in various configurations without departing from the spirit thereof. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention section can be appropriately replaced or combined to solve some or all of the above-described problems or achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0062] 100, 100b...curtain airbag device, 110...bag body, 110f...folded bag body, 110t...deployed bag body, 116...receiving portion, 130...inflator, 131...tip portion, 150...case, 151...first case, 152...second case, 153...third case, 154...accommodating portion, 160, 160A, 160B...first engaging portion, 161...first base portion, 162...fixing hole, 163 ...end portion, 164...central portion, 165...projecting portion, 166...fitting portion, 168...holding portion, 168a...first portion, 168b...second portion, 170...second engaging portion, 171...second base portion, 175...receiving portion, 176...bottom portion, 179...fitting hole, 180...belt-shaped member, 181...first through hole, 182...second through hole, 183...first end portion, 184...second end portion, 185...vertex edge portion, 200, 200b...vehicle, 201, 201b...vehicle body

Claims

1. A curtain airbag device for a vehicle, a bag body that is inflated and deployed by being supplied with inflation gas; a first engagement portion fixed to the bag body, The curtain airbag device, wherein the first engaging portion is configured to be able to engage with a second engaging portion provided on a holding portion for holding the bag body.

2. The curtain airbag device according to claim 1, The first engagement portion is sewn to the bag body.

3. The curtain airbag device according to claim 1, The bag further includes a belt-shaped member for maintaining the bag body in a folded state, the belt-shaped member being configured to break when the bag body is inflated and deployed, the first engagement portion has a protruding portion that protrudes in a direction opposite to the deployment direction of the bag body, the belt-shaped member has a first through-hole provided at a first position of the belt-shaped member and a second through-hole provided at a second position of the belt-shaped member, the first position and the second position each representing a position in a longitudinal direction of the belt-shaped member; the belt-shaped member is wrapped around the folded bag body from the first position to the second position so that the protrusion is positioned within the first through-hole and the second through-hole.

4. The curtain airbag device according to claim 3, The curtain airbag device, wherein the belt-shaped member is made of nonwoven fabric.

5. The curtain airbag device according to claim 1, the bag body has a receiving portion for receiving the inflation gas from the inflator, the first engagement portion includes one engagement portion and another engagement portion, A curtain airbag device, wherein the one engaging portion and the other engaging portion are arranged so that the receiving portion is located between the one engaging portion and the other engaging portion in the longitudinal direction of the bag body folded into a long shape.

6. The curtain airbag device according to any one of claims 1 to 5, The first engaging portion has a fitting portion that can be fitted into a fitting hole provided in the second engaging portion.

7. An airbag case, a storage section for storing a bag body in a folded state, the bag body being included in a curtain airbag device for a moving body and configured to be inflated and deployed by being supplied with inflation gas; An airbag case comprising: a second engaging portion configured to be engageable with a first engaging portion fixed to the bag body, the second engaging portion being fixed to the accommodation portion.

8. A moving body to which a curtain airbag device is attached, A mobile body; A moving body comprising: a second engaging portion configured to be engageable with a first engaging portion fixed to a bag body of the curtain airbag device, the second engaging portion being fixed to the moving body main body.

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