Curtain airbag system

Abstract

[Problem] To maintain a stored form and smoothly expand and deploy an air bag cushion by using a simple and inexpensive configuration. [Solution] A curtain airbag device 100 comprises: a mini-wrapper 138 and a deployment auxiliary cloth 152 wound around an airbag cushion 102 in a stored form; a connection part 168 for connecting the mini-wrapper 138 and the deployment auxiliary cloth 152 to the airbag cushion 102; and a cover member 136 for covering the airbag cushion 102 in the stored form. The dimension L1 from the connection part 168 to another side 172b of a first region 172 of the deployment auxiliary cloth 152 falls within a range H1 from the connection part 168 of the mini-wrapper 138 to an opening 140. In a second region 174, the dimension L2 from the connection part 168 to another side 174b is larger than that of the first region 172. The deployment auxiliary cloth 152 is arranged such that the second region 174 overlaps an end part 176 of the cover member 136.

Description

Technical Field

[0001] The present invention relates to a curtain airbag device that protects occupants during side collisions or rollovers of a vehicle.

Background Art

[0002] In recent vehicles, airbag devices are almost standard equipment as safety devices. A general airbag device detects an impact with a sensor, activates an inflator which is a gas generator, and inflates and deploys an airbag cushion with the gas pressure. The airbag cushion is folded and stored at the center of the steering wheel in the case of a front airbag device, for example, and is stored near the upper part of the side door of the passenger compartment in a wound state in the case of a curtain airbag device.

[0003] In the above curtain airbag device, since the airbag cushion has an elongated shape, a strip-shaped cloth material, tape, etc. are used to maintain its storage form. Further, in the head protection airbag device of Patent Document 1, for example, as described in paragraph 0060 and FIG. 13, a resin guide plate 45 and a cloth belt 56 are implemented as airbag bag body deployment direction regulating means. In the technique of Patent Document 1, as described in paragraph 0044, paragraph 0060, etc., the upper end portion 49A of the garnish 49 is covered with the cloth belt 56, and the airbag bag body 16 is prevented from entering the gaps around the upper end portion 49A.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] In the technology described in Patent Document 1, as shown in Figures 1 and 2, a metal plate 42 is provided above the center pillar garnish 49, and the aforementioned guide plate 45 and fabric belt 56 are then provided. However, the configuration in Patent Document 1 makes extensive use of metal and resin components. Currently, there is a demand for a simpler and lower-cost method to avoid interference between the airbag cushion and surrounding structures. [Problems that the invention aims to solve]

[0006] In view of these problems, the present invention aims to provide a curtain airbag device that can maintain the stored form of the airbag cushion and enable smooth inflation and deployment with a simple and cost-effective configuration. [Means for solving the problem]

[0007] To solve the above problems, a typical configuration of the curtain airbag device according to the present invention is a curtain airbag device comprising an airbag cushion that is wound up or folded to form a long storage form in the front-rear direction of the vehicle and attached to the upper part of the side wall of the passenger compartment, and an inflator that supplies gas to the airbag cushion, wherein the curtain airbag device further comprises a tab that is strip-shaped and protrudes upward from the airbag cushion in its storage form and is fixed to the side wall of the passenger compartment, a deployment assist fabric that is cloth-like with one side connected to the airbag cushion in its storage form and the other side free, a connecting part that connects one side of the deployment assist fabric to the airbag cushion, and a meter that protrudes from a predetermined location on the other side of the deployment assist fabric. The airbag cushion comprises a trumpet, an opening made in the mini-trumpet and hooked onto a tab, and a cover member that extends along a predetermined range in the longitudinal direction of the stored airbag cushion and covers the vehicle interior side wall of the airbag cushion. The deployment assist cloth is held in a wrapped state around the stored airbag cushion by hooking the opening of the mini-trumpet onto the tab. The deployment assist cloth has a first region formed in the range where the mini-trumpet is provided, and a second region provided adjacent to the first region in the longitudinal direction of the stored airbag cushion, with the dimension from the connection part to the other side being larger than that of the first region. The deployment assist cloth is characterized in that the second region is arranged to overlap at least the end of the cover member.

[0008] According to the above configuration, when the airbag cushion is released from its stored state and inflated, the second region of the deployment assist fabric covers any gaps or steps between the cover member and the surrounding vehicle interior side wall or pillar, preventing the airbag cushion from interfering with these gaps. Therefore, the above configuration ensures smooth deployment of the airbag cushion and allows it to quickly inflate and deploy to the desired area. Furthermore, the above configuration is simple and minimizes the use of parts made of other materials, thus reducing manufacturing costs.

[0009] The mini-trumpet described above may be attached to the deployment support fabric in a strip shape, with its opening protruding from the other side of the deployment support fabric.

[0010] With the above configuration, it becomes possible to efficiently wrap the deployment support fabric around the airbag cushion in its stored state using the mini-trumpet.

[0011] The above connection point connects the mini-trumpet to the airbag cushion along with one side of the deployment support cloth, and the dimensions of the first region from the connection point to the other side may be such that they fall within the range from the connection point to the opening of the mini-trumpet.

[0012] With the above configuration, it becomes possible to efficiently wrap the deployment support fabric around the airbag cushion in its stored state using the mini-trumpet.

[0013] The mini-trumpet described above has a weak portion located in the area between the connection and the opening, which allows the mini-trumpet to rupture when the airbag cushion inflates and deploys. The other side of the first region is preferably located between the weak portion of the mini-trumpet and the opening in the circumferential direction of the airbag cushion in its stored form.

[0014] According to the above configuration, the mini-trumpet can rupture at the weak point immediately after the airbag cushion begins to inflate, allowing for efficient release of the wrapping. Furthermore, if the first region of the deployment support fabric is sized such that its other side is positioned between the weak point and the opening of the mini-trumpet, it can avoid being pinched between the airbag cushion and the tab, enabling efficient deployment.

[0015] The mini-trumpet described above may be formed integrally with the deployment support fabric. This configuration also allows the mini-trumpet to be used to efficiently wrap the deployment support fabric around the airbag cushion in its stored state.

[0016] The above-mentioned mini-trumpet may have a fragile portion provided at a predetermined location that ruptures when the airbag cushion inflates and deploys, separating the area including the opening from the deployment support fabric.

[0017] With the above configuration, the mini-trumpet can rupture at the weak point immediately after the airbag cushion begins to inflate, allowing for efficient release of the wrapping.

[0018] Another typical configuration of the curtain airbag device according to the present invention is a curtain airbag device comprising an airbag cushion that is rolled up or folded to form a long storage configuration in the longitudinal direction of the vehicle and attached to the upper part of the side wall of the passenger compartment, and an inflator that supplies gas to the airbag cushion, wherein the curtain airbag device further comprises an inflator insertion section into which the inflator is inserted, and a deployment assist cloth which is in the form of a cloth and has one side connected to the airbag cushion in its storage configuration at a predetermined connection section and the other side free, wherein the deployment assist cloth has a first region formed on the side of the inflator insertion section in the longitudinal direction of the airbag cushion in its storage configuration, and a second region provided on the side opposite to the inflator insertion section when viewed from the first region in the longitudinal direction, and the dimension from the connection section to the other side is larger than that of the first region.

[0019] With the above configuration, when the airbag cushion is released from its stored position and inflated and deployed, the second region of the deployment assist fabric covers any gaps or steps between the cover member and the surrounding vehicle interior side wall or pillar, preventing the airbag cushion from interfering with these gaps. Furthermore, because the shorter first region is provided on the inflator insertion side, the airbag cushion can be inflated and deployed without causing gas blockage due to the winding of the deployment assist fabric, that is, without the deployment assist fabric blocking the gas flow. In addition, as the airbag cushion inflates and deploys from the inflator insertion side, the winding of the deployment assist fabric is smoothly released, making it possible to quickly inflate and deploy the airbag cushion to the desired area.

[0020] The other sides of the second region described above may protrude from the other sides of the first region in a stepped manner.

[0021] The deployment assist fabric with the above configuration can also cover the gaps and steps between the cover member and the surrounding structures, preventing the interference of the airbag cushion with these gaps and the like.

[0022] The other side of the second region described above may be inclined so that the dimension of the second region gradually expands from the first region.

[0023] The deployment assist fabric with the above configuration can also cover the gaps and steps between the cover member and the surrounding structures, preventing the interference of the airbag cushion with these gaps and the like.

[0024] The other side of the first region described above may be inclined so that the dimension of the first region gradually expands toward the second region.

[0025] The deployment assist fabric with the above configuration can also cover the gaps and steps between the cover member and the surrounding structures, preventing the interference of the airbag cushion with these gaps and the like.

[0026] The other side of the deployment assist fabric described above may be inclined so that the dimension of the deployment assist fabric gradually expands from the end on the first region side toward the end on the second region side.

[0027] The deployment assist fabric with the above configuration can also cover the gaps and steps between the cover member and the surrounding structures, preventing the interference of the airbag cushion with these gaps and the like.

[0028] The above mini bellows may be formed of a non-woven fabric. If it is a mini bellows formed of a non-woven fabric, it can be smoothly broken in accordance with the inflation and deployment of the airbag cushion.

[0029] The above weak portion may be formed by a slit. If it is a weak portion formed by a slit, it is possible to smoothly break the mini bellows.

[0030] The above connection may integrally connect the mini-trumpet, one side of the deployment assist fabric, one end of the tab, and the uninflated portion of the airbag cushion.

[0031] This configuration allows for the mini-trumpet, deployment assist fabric, and tab to be suitably connected to the non-inflated portion of the airbag cushion.

[0032] The curtain airbag device further includes tapes provided on both sides of the mini-trumpet for wrapping the deployment assist fabric around the airbag cushion in its stored state, and the tapes may be rupturable by the inflation pressure of the airbag cushion.

[0033] With the above configuration, using tape along with the mini-horn makes it possible to efficiently maintain the stored form of the airbag cushion. [Effects of the Invention]

[0034] According to the present invention, it is possible to provide a curtain airbag device that can maintain the stored form of the airbag cushion and enable smooth inflation and deployment with a simple and cost-effective configuration. [Brief explanation of the drawing]

[0035] [Figure 1] This figure illustrates an overview of a curtain airbag device according to an embodiment of the present invention. [Figure 2] Figure 1 shows an example of the airbag cushion on its own. [Figure 3] This is a magnified example of the area around the tab in Figure 2(b). [Figure 4] This diagram illustrates the area around the tab of the airbag cushion shown in Figure 2(a). [Figure 5] Figure 2(a) shows cross-sectional views of the airbag cushion. [Figure 6] Figure 5(a) illustrates how the airbag cushion inflates and deploys. [Figure 7]Figure 5(b) illustrates how the airbag cushion inflates and deploys. [Figure 8] Figure 3(b) illustrates the initial state of the airbag cushion as it begins to inflate and deploy. [Figure 9] This figure illustrates a modified example of the unfolding aid cloth shown in Figure 4(a). [Figure 10] This figure illustrates a modified example of the unfolding aid cloth shown in Figure 4(a). [Figure 11] This figure illustrates a modified version of the mini-trumpet shown in Figure 4. [Figure 12] Figure 11 shows an example of applying tape to the mini-horn. [Figure 13] This figure illustrates a further modification of the mini-trumpet shown in Figure 4. [Figure 14] Figure 4(a) illustrates a modified example of the airbag cushion. [Modes for carrying out the invention]

[0036] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific numerical values ​​shown in these embodiments are merely illustrative to facilitate understanding of the invention and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to avoid redundant explanations, and elements not directly related to the present invention are omitted from the illustrations.

[0037] Figure 1 is a diagram illustrating an overview of a curtain airbag device 100 according to an embodiment of the present invention. Figure 1(a) is a diagram illustrating the curtain airbag device 100 before activation. The curtain airbag device 100 illustrated in the figure is for the right side of the vehicle compartment, but a left side version, which is not shown, has a similar symmetrical structure.

[0038] In the following diagrams, including Figure 1(a), the vehicle's front-rear direction is indicated by arrows F (Forward) and B (Back), the left-right direction in the vehicle's width direction is indicated by arrows L (Left) and R (Right), and the vehicle's up-down direction is indicated by arrows U (Up) and D (Down). Specifically, "up" refers to the direction of the head from the perspective of an occupant in a properly seated position, and "down" refers to the direction of the lower limbs from the perspective of the same occupant.

[0039] The vehicle is assumed to be a two-row seat vehicle with front seats 104 and rear seats 106 arranged from the front of the vehicle. The vehicle is provided with multiple pillars that support the roof. The multiple pillars include A-pillar 108, B-pillar 110, and C-pillar 112 from the front of the vehicle.

[0040] The airbag cushion 102 is rolled up or folded to form a long, roll-shaped storage unit in the front-to-rear direction of the vehicle, and is installed on the roof side rails 114 at the top of the side wall of the passenger compartment. The installed airbag cushion 102 is covered by the roof trim and stored in the space between the roof side rails 114 and the roof trim.

[0041] The curtain airbag system 100 has an inflator 116, which is a gas generator, located on top of the airbag cushion 102. The airbag cushion 102 inflates due to the pressure of the gas supplied from the inflator 116 to restrain the occupant.

[0042] In this embodiment, a cylindrical inflator 116 is used. Currently available inflators include types that are filled with a gas generating agent and burned to produce gas, types that are filled with compressed gas and supply gas without generating heat, and types that have both a gas generating agent and compressed gas. Any of these types can be used as the inflator 116.

[0043] When a vehicle is involved in a side collision or rollover, sensors on the vehicle detect the impact, and a signal is sent to the inflator 116. Upon receiving this signal, the inflator 116 activates and supplies gas to the airbag cushion 102.

[0044] Figure 1(b) illustrates the state after the curtain airbag system 100 has been activated. When the airbag cushion 102 receives gas from the inflator 116, it inflates and deploys downward along the side wall of the vehicle interior, such as the side window 118 (see Figure 1(a)), to protect the occupants.

[0045] The inflatable area of ​​the airbag cushion 102 is divided into several small chambers, taking into consideration areas where occupants may come into contact. For example, a chamber 120 is provided at the front of the vehicle to protect the occupants of the front seats 104. A chamber 122 is provided at the rear of the vehicle to protect the occupants of the rear seats 106. Each of these chambers is separated by a linear, non-inflatable area, such as a seam 124.

[0046] Figure 2 is a diagram illustrating the airbag cushion 102 from Figure 1 on its own. Figure 2(a) is a diagram illustrating the airbag cushion 102 from Figure 1(b) on its own.

[0047] The airbag cushion 102 is for curtain airbags and has a large shape that extends along the sides of the vehicle interior. The airbag cushion 102 is formed into a bag shape by overlapping and sewing or bonding two base fabrics that make up its surface, or by weaving using OPW (One-Piece Woven).

[0048] An inflator insertion section 128 is provided near the upper center of the upper edge 126 of the airbag cushion 102. The inflator insertion section 128 is shaped to protrude upward from the other upper edges 126 of the airbag cushion 102, and the gas outlet side of the inflator 116 (see Figure 2(b)) is inserted and attached to it.

[0049] The inflator insertion section 128 is connected to a duct section 130 that extends in the longitudinal direction of the vehicle, and gas from the inflator 116 is supplied to each chamber via the duct section 130.

[0050] The airbag cushion 102 is provided with tabs 132 at various points on its upper edge 126 for attachment to the vehicle. The tabs 132 are strip-shaped and can be manufactured from the same material as the inflatable part of the airbag cushion 102. In Figure 2(a), the tabs 132 extend downward from the upper edge 126 of the airbag cushion 102, but in practice, they are used extending upward from the upper edge 126. The tabs 132 are fixed to the roof side rail 114 (see Figure 1(a)) using components such as clips and bolts.

[0051] A strap 134 is also provided at the front end of the airbag cushion 102. The strap 134 is cord-like and connects the airbag cushion 102 to the A-pillar 108 (see Figure 1(b)). The strap 134 suppresses the swinging of the airbag cushion 102 when it inflates and deploys, stabilizing the deployment behavior, and also applies tension to the airbag cushion 102 in the longitudinal direction of the vehicle.

[0052] Figure 2(b) is a diagram illustrating the airbag cushion 102 of Figure 1(a) on its own. The stored form of the airbag cushion 102 in Figure 2(b) is formed by winding the airbag cushion 102 of Figure 2(a) from bottom to top.

[0053] The tab 132 is used in a state where it is exposed and protruding upward from the stored airbag cushion 102, without being rolled up or folded in the stored airbag cushion 102.

[0054] A cover member 136 is attached to the airbag cushion 102. The cover member 136 is mainly made of resin and has a shape that extends along the longitudinal direction of the airbag cushion 102 in its stored form, in the area near the inflator insertion part 128. The cover member 136 supports the inflator and covers the side of the airbag cushion 102 facing the roof side rail 114 (see Figure 1(a)), preventing interference between the airbag cushion 102 and surrounding structures, and providing a reaction force when the airbag cushion 102 inflates and deploys.

[0055] Figure 3 is an enlarged illustration of the area around tab 132 in Figure 2(b). Figure 3(a) is an illustration of the state before the deployment assist cloth 152 and mini-trumpet 138 are wrapped around the airbag cushion 102.

[0056] The airbag cushion 102 is provided with a tab 132 and a mini-trumpet 138. The mini-trumpet 138 is a strip-shaped member used to maintain the winding of the airbag cushion 102. The mini-trumpet 138 allows the airbag cushion 102 to maintain its stored configuration even before being installed in the vehicle, making transportation and installation in the vehicle easier.

[0057] Figure 3(b) illustrates the state in which the deployment assist fabric 152 and mini-trumpet 138 are wrapped around the airbag cushion 102 shown in Figure 3(a). The mini-trumpet 138 has an opening 140 at its tip. The opening 140 is a triangular shape with rounded corners, and can be temporarily connected by hooking it onto the tab 132. The mini-trumpet 138 has a fragile part 170, such as a slit, which can break when the airbag cushion 102 inflates and deploys, releasing the airbag cushion 102 and the deployment assist fabric 152.

[0058] The tab 132 has a fixing portion 142 on its upper end. The fixing portion 142 is provided as a square hole and is fixed to the roof side rail 114 (see Figure 1(a)) using a clip or bolt.

[0059] The tab 132 is provided with two slits 144a and 144b. The slits 144a and 144b are located on the side edges 146a and 146b of the tab 132, below the fixing portion 142. The slits 144a and 144b hook onto the edges of the opening 140 of the mini-trumpet 138, holding the mini-trumpet 138 wrapped around the airbag cushion 102.

[0060] As illustrated in Figure 3(a), the slits 144a and 144b are shaped to extend linearly diagonally upward from the side edges 146a and 146b. This shape causes the mini-trumpet 138 to bite deeper into the slits 144a and 144b when pulled away from the tab 132, making it less likely for the mini-trumpet 138 to fall off the tab 132.

[0061] The tab 132 is provided with a reinforcing stitch 148. The reinforcing stitch 148 is sewn in a continuous line along the two slits 144a and 144b and the upper side of the opening 140. The areas 150a and 150b above the slits 144a and 144b of the tab 132 function as a "return" for the mini-trumpet 138. By providing the reinforcing stitch 148, the rigidity of these "return" areas 150a and 150b is increased, making it more difficult for the mini-trumpet 138 to fall off.

[0062] Figure 4 is an example diagram showing the area around tab 132 of the airbag cushion 102 in Figure 2(a). Figure 4(a) is an example diagram showing a magnified view of the area around tab 132 from the same direction as Figure 2(a).

[0063] In this embodiment, the airbag cushion 102 is provided with a deployment assist cloth 152 near the tab 132. The deployment assist cloth 152 is a cloth-like member that assists in the inflation and deployment of the airbag cushion 102, and can be manufactured from the same material as the inflation part of the airbag cushion 102. The deployment assist cloth 152 deploys when the airbag cushion 102 is inflated and deployed, covering the structures surrounding the airbag cushion 102, thereby preventing the airbag cushion 102 from interfering with gaps in the surrounding structures.

[0064] Tab 132 is sewn by a connecting portion 168 to the non-inflatable portion 154 that forms the upper edge 126 of the airbag cushion 102, with its upper end extending downward on the inside of the airbag cushion 102 in the vehicle width direction. Mini flaps 138 are overlapped near the base of tab 132 with the opening 140 side facing upward, and are sewn together with tab 132 to the non-inflatable portion 154 by the connecting portion 168.

[0065] Figure 4(b) is a cross-sectional view AA of the airbag cushion 102 shown in Figure 4(a). The deployment assist fabric 152 has one side 156 connected to the non-inflatable portion 154 near the upper edge 126 of the airbag cushion 102, while the other side 158 is free.

[0066] Tab 132 has one end 160 connected near the upper edge 126 of the airbag cushion 102, and the other end 162, which has a fixing portion 142, is a free end. Mini-trumpet 138 has one end 164 connected near the tab 132 of the airbag cushion 102, and the other end 166 is wrapped around the airbag cushion 102 in its stored state and connected to tab 132 using the opening 140.

[0067] The connecting portion 168 is provided by sewing one side 156 of the deployment assist fabric 152, one end 160 of the tab 132, and one end 164 of the mini-trumpet 138 to the non-inflatable portion 154 of the upper edge 126 of the airbag cushion 102, thereby integrally connecting them. This configuration makes it possible to suitably connect the tab 132, the mini-trumpet 138, and the deployment assist fabric 152 to the non-inflatable portion 154 of the airbag cushion 102.

[0068] As illustrated in Figure 4(a), the mini-trumpet 138 has a weak point 170 on the side of the connection portion 168 when viewed from the opening 140. The weak point 170 is realized, for example, by a slit. Because the mini-trumpet 138 has a weak point 170, it breaks so as to split into the opening 140 side and the connection portion 168 side immediately after the airbag cushion 102 begins to inflate and deploy. This releases the mini-trumpet 138 from wrapping around the airbag cushion 102, allowing the airbag cushion 102 to inflate and deploy smoothly.

[0069] The mini-trumpet 138 is made of nonwoven fabric, and its strength is reduced. Because the mini-trumpet 138 is made of nonwoven fabric, it can smoothly rupture starting from the weak point 170 in accordance with the inflation and deployment of the airbag cushion 102.

[0070] The deployment support fabric 152 has varying dimensions along the longitudinal direction of the airbag cushion 102. For example, in the longitudinal direction of the airbag cushion 102 in the stored configuration shown in Figure 2(b), the deployment support fabric 152 has a smaller first region 172 (see Figure 4(a)) on the side of the inflator insertion portion 128, and a larger second region 174 on the side opposite to the inflator insertion portion 128 when viewed from the first region 172. More specifically, in this embodiment, the smaller first region 172 is provided in the area around which the mini-trumpet 138 is wrapped, and the larger second region 174 is provided in the area that does not overlap with the mini-trumpet 138 and the tab 132.

[0071] The first region 172 is formed such that, in the circumferential direction when the airbag cushion 102 is in a stored configuration, the dimension L1 from the connection portion 168 to the other side 172b falls within the range H1 from the connection portion 168 of the mini-trumpet 138 to the end of the opening 140.

[0072] The second region 174 is provided adjacent to the first region 172 in the longitudinal direction of the stored airbag cushion 102. The dimension L2 of the second region 174 from the connecting portion 168 to the other side 174b is larger than the dimension L1 of the first region 172 (L2 > L1).

[0073] The second region 174 is positioned to overlap the end portion 176 of the cover member 136 (see Figure 2(b)), covering any gaps or steps between the cover member 136 and the roof side rail 114 (see Figure 1(a)), thereby preventing the airbag cushion 102 from interfering with such gaps.

[0074] The other side 174b of the second region 174 protrudes in a stepped manner from the other side 172b of the first region 172. This enlarged second region 174 covers the gaps and steps between the cover member 136 (see Figure 2(b)) and the surrounding structure, preventing the airbag cushion 102 from interfering with these gaps, etc.

[0075] Figure 5 shows cross-sectional views of the airbag cushion 102 in Figure 2(a). Figure 5(a) shows a cross-sectional view of the airbag cushion 102 in Figure 2(a).

[0076] One end 160 of the tab 132 is connected near the upper edge 126 of the airbag cushion 102, and the other end 162 protrudes upward from the retracted airbag cushion 102.

[0077] The mini-trumpet 138 has one end 164 connected near the tab 132 of the airbag cushion 102, and the other end 166 is connected to the tab 132 using the opening 140 while wrapped around the airbag cushion 102 in its stored state.

[0078] The deployment support fabric 152 is wrapped around the stored airbag cushion 102 by the mini-trumpet 138.

[0079] The vulnerable portion 170 of the mini-trumpet 138 is located in the area between the connecting portion 168 and the opening 140. The other side 172b of the first region 172 of the deployment assist fabric 152 is configured to be located between the vulnerable portion 170 of the mini-trumpet 138 and the opening 140 in the circumferential direction of the stored airbag cushion 102.

[0080] By providing a weak point 170 on the mini-trumpet 138, the mini-trumpet 138 can be ruptured immediately after the airbag cushion 102 begins to inflate, making it possible to efficiently release the wrapping of the mini-trumpet 138. In addition, the first region 172 of the deployment assist fabric 152 is sized such that its other side 172b is positioned between the weak point 170 of the mini-trumpet 138 and the opening 140, thereby preventing it from being caught between the airbag cushion 102 and the tab 132 and enabling smooth deployment.

[0081] Figure 5(b) is a cross-sectional view of the airbag cushion 102 shown in Figure 2(a). The second region 174 of the deployment assist fabric 152 covers a wider area in the circumferential direction of the airbag cushion 102 in its stored state than the first region 172 (see Figure 5(a)).

[0082] Figure 5(c) is a cross-sectional view of the airbag cushion 102 shown in Figure 2(a). The second region 174 can be bundled with tape 178 in the stored airbag cushion 102. By using a material that can be broken by the force when the airbag cushion 102 is inflated and deployed, the stored airbag cushion 102 can be released together with the mini-trumpet 138 which has a weak point 170 (see Figure 5(a)).

[0083] Figure 6 illustrates the inflating and deploying of the airbag cushion 102 shown in Figure 5(a). Figure 6(a) illustrates the curtain airbag device 100 shown in Figure 5(a) attached to the roof side rail 114.

[0084] The cover member 136 is fixed to the roof side rail 114 using clips 180. The clips 180 pass through the tabs 132 and are inserted into the tab mounting portion 182 of the cover member 136 and the roof side rail 114.

[0085] The cover member 136 has a curved portion 184 to which the retracted airbag cushion 102 is assembled. The curved portion 184 is shaped to curve along the outer circumference of the retracted airbag cushion 102.

[0086] A jump portion 186 is provided below the curved portion 184 of the cover member 136. The jump portion 186 is a part that prevents the airbag cushion 102 from interfering with structures such as the pillar garnish 190 below the roof side rail 114, and extends inward from the curved portion 184.

[0087] Figure 6(b) illustrates the process of the curtain airbag device 100 shown in Figure 6(a) inflating and deploying.

[0088] When gas is supplied to the airbag cushion 102, the jump section 186 guides the airbag cushion 102 toward the interior of the vehicle, and the airbag cushion 102 pushes against the roof trim 188 and inflates and deploys downward. In this way, the airbag cushion 102 can overcome the pillar garnish 190 and other components without interfering with them, and can inflate and deploy smoothly thanks to the jump section 186.

[0089] As illustrated in Figure 5(a), the other side 172b of the first region 172 of the deployment support cloth 152 is configured to be located between the vulnerable portion 170 of the mini-trumpet 138 and the opening 140 in the circumferential direction of the stored airbag cushion 102. Therefore, as illustrated in Figure 6(b), the first region 172 can be deployed smoothly without being caught between the airbag cushion 102 and the tab 132.

[0090] Figure 7 illustrates the inflating and deploying of the airbag cushion 102 shown in Figure 5(b). Figure 7(a) illustrates the curtain airbag device 100 shown in Figure 5(b) attached to the roof side rail 114.

[0091] The deployment support cloth 152 is positioned so that its second region 174 overlaps the end portion 176 of the cover member 136 (see Figure 2(b)). The second region 174 of the deployment support cloth 152 can cover a wider area than the first region 172 (see Figure 6(a)) to cover gaps and steps between the cover member 136 and surrounding structures such as the roof side rails 114 and pillar garnishes 190.

[0092] Figure 7(b) illustrates the process of the curtain airbag device 100 shown in Figure 7(a) inflating and deploying.

[0093] According to the second region 174, the gaps and steps between the cover member 136 and the surrounding roof side rails 114 and pillar garnish 190 can be covered, making it possible to prevent the airbag cushion 102 from interfering with these gaps, etc.

[0094] Thus, according to this embodiment, when the airbag cushion 102 is released from its stored state and inflated and deployed, the second region 174 of the deployment assist fabric 152 covers the gaps and steps between the cover member 136 and the surrounding vehicle interior side wall and pillar, thereby preventing the airbag cushion 102 from interfering with these gaps, etc.

[0095] As illustrated in Figure 4(a), the dimensions of the first region 172 are set to be smaller than those of the second region 174. For example, in Figure 5(a), if the deployment assist fabric 152 is long enough to reach the tab 132 when wrapped around the airbag cushion 102, even if the mini-trumpet 138 breaks when the airbag cushion 102 inflates and deploys, the deployment assist fabric 152 will be trapped between the inflating airbag cushion 102 and the tab 132, making it difficult for it to spread downwards, which may delay the deployment of the airbag cushion 102.

[0096] On the other hand, for example, in Figure 6(a), if the deployment assist fabric 152 is made too short so that it does not reach the tab 132 in the circumferential direction of the airbag cushion 102, the deployment assist fabric 152 may not be able to cover the gap between the cover member 136 and the upper end of the pillar garnish 190.

[0097] Therefore, in this embodiment, the first region 172 of the deployment support cloth 152, which is bundled by the tab 132 and the mini-trumpet 138, is set such that when the deployment support cloth 152 is wrapped around the airbag cushion 102 as illustrated in Figure 6(a), the other side 172b does not come into contact with the tab 132, and when the deployment support cloth 152 is unwrapped as illustrated in Figure 6(b), the other side 172b reaches below the upper end of the pillar garnish 190, so that the deployment support cloth 152 can cover the gap between the cover member 136 and the upper end of the pillar garnish 190.

[0098] Figure 8 illustrates the initial state when the airbag cushion 102 shown in Figure 3(b) begins to inflate and deploy. When the airbag cushion 102 begins to inflate and deploy, the mini-trumpet 138 breaks at the weak point 170 (see Figure 3(b)) and separates into a tip 138a and a base 138b, releasing the airbag cushion 102 and the deployment assist fabric 152.

[0099] In the deployment support fabric 152, in the longitudinal direction of the stored airbag cushion 102, a smaller first region 172 (see Figure 4(a)) is provided on the side of the inflator insertion portion 128 (see Figure 2(b)), and a larger second region 174 is provided on the opposite side of the inflator insertion portion 128 from the first region 172. That is, the first region 172 is provided on the upstream side of the gas flow, where inflation and deployment begin, and the second region 174 is provided on the downstream side of the gas flow.

[0100] In this embodiment, the deployment assist fabric 152 has a first region 172 that is shorter than the second region 174 in the circumferential direction of the stored airbag cushion 102. Because the shorter first region 172 is located on the inflator insertion section 128 side, the airbag cushion 102 can be inflated and deployed without causing gas blockage due to the deployment assist fabric 152 wrapping around it, that is, without the deployment assist fabric 152 blocking the gas flow. Furthermore, as the airbag cushion 102 inflates and deploys from the inflator insertion section 128 side, the wrapping of the deployment assist fabric 152 can also be smoothly released. In other words, the deployment assist fabric 152 can be smoothly deployed without getting caught in the airbag cushion 102 or pinched between it and surrounding structures, as the wrapping is released from the circumferentially shorter first region 172 when it is wrapped around it.

[0101] With the above configuration, the deployment support cloth 152 smoothly deploys from the first region 172 side, and the second region 174 covers the gap between the cover member 136 (see Figure 7(b)) and the upper end of the pillar garnish 190, thereby enabling the airbag cushion 102 to inflate and deploy to the desired area quickly.

[0102] As described above, the curtain airbag device 100 of this embodiment ensures smooth deployment of the airbag cushion 102 and allows for rapid inflation and deployment of the airbag cushion 102 to the desired area. Furthermore, this embodiment has a simple structure and minimizes the use of parts made of other materials, thus reducing manufacturing costs.

[0103] (modified version) The following describes variations of each of the components mentioned above. In Figure 9 and subsequent figures, components that have already been described are given the same reference numerals, and thus the explanation of previously described components is omitted. In addition, in the following explanation, components with the same name as those already described are assumed to have the same function unless otherwise specified, even if they are given different reference numerals.

[0104] Figures 9 and 10 illustrate modified examples of the unfolding support cloth 152 in Figure 4(a). Figure 9(a) illustrates the first modified example (unfolding support cloth 200) of the unfolding support cloth 152 in Figure 4(a).

[0105] The deployment support cloth 200 also has an enlarged dimension in the second region 204 relative to the first region 202. In particular, the front portion 208 of the other side 206 of the second region 204 is inclined so that the dimension of the second region 204 gradually widens from that of the first region 202.

[0106] The deployment assist fabric 200 also covers the gaps and steps between the cover member 136 and the surrounding structure, preventing the airbag cushion 102 from interfering with these gaps. In particular, since the shape of the deployment assist fabric 200 changes smoothly from the first region 202 to the second region 204 by the front portion 208, it prevents localized concentration of force and enables smooth deployment.

[0107] Figure 9(b) illustrates a second modified example (unfolding aid cloth 220) of the unfolding aid cloth 152 in Figure 4(a).

[0108] In the deployment support cloth 220, the other side 226 of the first region 222 is inclined such that the dimensions of the first region 222 gradually widen toward the second region 224.

[0109] The deployment assist fabric 220 also covers any gaps or steps between the cover member 136 and the surrounding structure, preventing the airbag cushion 102 from interfering with these gaps. In particular, because the shape of the first region 222 of the deployment assist fabric 220 smoothly changes toward the second region 224, it prevents localized concentration of force and enables smooth deployment.

[0110] Figure 10 illustrates a third modified example (unfolding aid cloth 240) of the unfolding aid cloth 152 in Figure 4(a).

[0111] The other side 242 of the deployment support cloth 240 is inclined so that the dimensions of the deployment support cloth 240 gradually widen from the end 246 on the first region 244 side to the end 250 on the second region 248 side.

[0112] The deployment assist fabric 240 also covers the gaps and steps between the cover member 136 and the surrounding structure, preventing the airbag cushion 102 from interfering with these gaps. In particular, since the overall shape of the deployment assist fabric 240 changes smoothly from the first region 244 to the second region 248, it prevents localized concentration of force and enables smooth deployment.

[0113] Figure 11 illustrates a modified example of the mini-trumpet 138 in Figure 4. The mini-trumpet 300 illustrated in Figure 11 differs from the above embodiments in that it is formed integrally with the deployment assist cloth 302.

[0114] The mini-trumpet 300 is provided so as to protrude from the other side 306 of the first region 304 of the deployment support fabric 302, within the range of the first region 304. The mini-trumpet 300 can also be used to hold the deployment support fabric 302 wrapped around the airbag cushion 102 in its stored state (see Figure 3(a)) by hooking its opening 308 onto the tab 310.

[0115] The mini-trumpet 300 is provided with a slit-shaped weak point 312 along the other side 306 of the first region 304. The weak point 312 ruptures when the airbag cushion inflates and deploys, allowing the area including the opening 308 of the mini-trumpet 300 to be separated from the deployment support fabric 302. This releases the winding of the deployment support fabric 302, allowing the airbag cushion 102 (see Figure 3(a)) to be released.

[0116] In this way, the mini-trumpet 300, which is formed integrally with the deployment support fabric 302, can also be used to efficiently wrap the deployment support fabric 302 around the stored airbag cushion 102 by hooking the opening 308 of the mini-trumpet 300 onto the tab 310.

[0117] Furthermore, the shape of the deployment support cloth 302, into which the mini-trumpet 300 is integrally formed, can be changed to the same shape as the deployment support cloth 200 in Figure 9(a), the deployment support cloth 220 in Figure 9(b), and even the deployment support cloth 240 in Figure 10. By integrally forming the mini-trumpet 300 with these deployment support cloths 200, 220, and 240, it is possible to obtain both the effects of the mini-trumpet 300 described above and the effects of the deployment support cloths 200, 220, and 240.

[0118] Figure 12 shows an example of applying tapes 320 and 322 to the mini-wrapper 300 of Figure 11. Figure 12(a) illustrates tapes 320 and 322 according to Figure 11.

[0119] Tapes 320 and 322 can be used on both sides of the mini-trumpet 300 to wrap the deployment support cloth 302 around the stored airbag cushion 102 (see Figure 12(b)). Tapes 320 and 322 are made of a material that can be broken by the inflation pressure of the airbag cushion 102, and break at approximately the same time as the weak point 312, thereby releasing the deployment support cloth 302 and the airbag cushion 102.

[0120] Considering that tapes 320 and 322 are provided, the deployment support cloth 302 can also be extended so that the first region 304 is away from the mini-trumpet 300.

[0121] Figure 12(b) illustrates the storage configuration of the airbag cushion 102 shown in Figure 12(a). In this modified example, by using tapes 320 and 322 together with the mini-trumpet 300, the storage configuration of the airbag cushion 102 can be efficiently maintained.

[0122] Figure 13 illustrates a further modification of the mini-trumpet 138 in Figure 4. Figure 13(a) illustrates the mini-trumpet 340 according to Figure 4. The mini-trumpet 340 is provided as a separate component from the tab 310 and the deployment assist cloth 342.

[0123] The mini-trumpet 340 is a short, strip-shaped member, and its opening 344 is positioned to protrude from the other side 348 of the first region 346 of the deployment support cloth 342. In this case, the dimension L3 of the first region 346 from the connecting portion 168 to the other side 348 is such that it fits within the range H2 from the connecting portion 168 to the tip side of the opening 344 of the mini-trumpet 340.

[0124] Figure 13(b) is an example of the mini-trumpet 340 of Figure 13(b) from the opposite side. The mini-trumpet 340 is attached to the deployment support fabric 342 by a sewn joint 350. The mini-trumpet 340 also has a slit-shaped fragile portion 352, which allows the tip portion 354 with an opening 344 to be separated from the base portion 356 when the airbag cushion 102 (see Figure 6(b)) is inflated and deployed.

[0125] In this modified example, the mini-trumpet 340 can be used to efficiently wrap the deployment support fabric 342 around the stored airbag cushion 102 (see Figure 3(a)). In particular, in this modified example, since the mini-trumpet 340 is independent of the deployment support fabric 342 and the tab 310 (see Figure 11), it is possible to change the material of the mini-trumpet 340 to a different material from the deployment support fabric 342 and the tab 310. For example, in this modified example, it is possible to change the material of the mini-trumpet 340 to a material that is easily broken at the weak point 352 or to a material with high rigidity.

[0126] Furthermore, the shape of the deployment support cloth 342 to which the mini-trumpet 340 is attached can be changed to the same shape as the deployment support cloth 200 in Figure 9(a), the deployment support cloth 220 in Figure 9(b), and even the deployment support cloth 240 in Figure 10. By attaching the mini-trumpet 340 to these deployment support cloths 200, 220, and 240, it is possible to obtain both the effects of the mini-trumpet 340 described above and the effects of the deployment support cloths 200, 220, and 240.

[0127] Figure 14 illustrates a modified example (airbag cushion 360) of the airbag cushion 102 in Figure 4(a). Figure 14(a) illustrates the airbag cushion 360 in correspondence with Figure 4(a).

[0128] The airbag cushion 360, like the airbag cushion 102 in Figure 4(a), comprises an inflatable chamber 122, a non-inflatable portion 154 forming an upper edge 126, and a deployment assist fabric 152 connected to the non-inflatable portion 154.

[0129] In the airbag cushion 360, the tab 132 and mini-trumpet 138 shown in Figure 4(a) are omitted, and tapes 362 and 364 are used instead. Tapes 362 and 364 can be used on the end of the deployment support fabric 152 on the first region 172 side and the end on the second region 174 side.

[0130] Figure 14(b) illustrates the stored state of the airbag cushion 360 shown in Figure 14(a). The deployment support fabric 152 is wrapped around the airbag cushion 360 in its stored state, and both ends are secured by tapes 362 and 364. The tapes 362 and 364 can bundle the ends of the deployment support fabric 152 using their adhesive properties.

[0131] Tapes 362 and 364 are made of a material that can be ruptured by the gas force when the airbag cushion 360 inflates. Like the mini-trumpet 138 in Figure 8, tapes 362 and 364 also rupture when the airbag cushion 360 inflates and deploys, releasing the airbag cushion 360 and the deployment support fabric 152.

[0132] In this way, the airbag cushion 360 can maintain its stored form and the winding of the deployment assist cloth 152 by tapes 362 and 364. Furthermore, the airbag cushion 360 also has a first region 172 provided on the side of the inflator insertion section 128 (see Figure 2(b)), which allows it to inflate and deploy without causing gas blockage due to the winding of the deployment assist cloth 152, that is, without the deployment assist cloth 152 blocking the gas flow. In conjunction with the inflation and deployment of the airbag cushion 102 progressing from the inflator insertion section 128 side, the tapes 362 and 364 can be smoothly ruptured and the winding of the deployment assist cloth 152 released.

[0133] With the above configuration, the airbag cushion 360 can be rapidly inflated and deployed to the desired area by having the deployment assist fabric 152 smoothly deploy from the first region 172 side, while the second region 174 covers the gap between the cover member 136 (see Figure 7(b)) and the upper end of the pillar garnish 190.

[0134] Preferred embodiments of the present invention have been described above with reference to the attached drawings. However, the embodiments described above are preferred examples of the present invention, and other embodiments can be implemented or carried out in various ways. Unless otherwise stated in this specification, the present invention is not limited to the detailed shapes, sizes, and configurations of the parts shown in the attached drawings. Furthermore, the expressions and terms used in this specification are for illustrative purposes only and are not limited thereto unless otherwise stated.

[0135] Therefore, it is clear to those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and these will naturally fall within the technical scope of the present invention. [Industrial applicability]

[0136] This invention can be used in curtain airbag systems that protect occupants during side collisions or rollovers of a vehicle. [Explanation of Symbols]

[0137] H1...range, L1...dimension, L2...dimension, 100...curtain airbag device, 102...airbag cushion, 104...front seat, 106...rear seat, 108...A-pillar, 110...B-pillar, 112...C-pillar, 114...roof side rail, 116...inflator, 118...side window, 120...chamber, 122...chamber, 124...seam, 126...upper edge, 128...inflator insertion part, 130...duct part, 132...tab, 134...strap, 136 ...Cover member, 138...Mini trumpet, 138a...Tip, 138b...Base, 140...Opening, 142...Fixing part, 144a...Slit, 146a...Side edge, 148...Reinforcement stitching part, 150a...Area, 152...Deployment assist cloth, 154...Non-expanding part, 156...One side, 158...Other side, 160...One end, 162...Other end, 164...One end, 166...Other end, 168...Connecting part, 170...Weak part, 172...First area, 172a...One side, 172b...Other side, 174...Second area, 174a...One side, 174 b...other side, 176...end, 178...tape, 180...clip, 182...tab attachment part, 184...curved part, 186...jump part, 188...roof trim, 190...pillar garnish, 200...unfolding aid cloth, 202...first area, 204...second area, 206...other side, 208...front part, 220...unfolding aid cloth, 222...first area, 224...second area, 226...other side, 240...unfolding aid cloth, 242...other side, 244...first area, 246...end, 248...second area, 250...end 260...Airbag cushion, 262...Deployment assist cloth, 300...Mini flaps, 302...Deployment assist cloth, 304...First area, 306...Other side, 308...Opening, 310...Tab, 312...Weak point, 320, 322...Tape, 340...Mini flaps, 342...Deployment assist cloth, 344...Opening, 346...First area, 348...Other side, 350...Joint, 352...Weak point, 354...Tip, 356...Base, H2...Range, L3...Dimension, 360...Airbag cushion, 362, 364...Tape

Claims

1. A curtain airbag system comprising an airbag cushion that is rolled up or folded to form a long storage configuration in the front-rear direction of the vehicle and is attached to the upper part of the side wall of the passenger compartment, and an inflator that supplies gas to the airbag cushion, The curtain airbag system further, A tab that is strip-shaped, protrudes upward from the airbag cushion in the aforementioned storage configuration, and is fixed to the side wall of the vehicle compartment, A deployment assist cloth that is in the form of a fabric, with one side connected to the airbag cushion in the aforementioned storage configuration and the other side being free, A connecting portion that connects one side of the deployment support fabric to the airbag cushion, A mini-trumpet protruding from a predetermined location on the other side of the aforementioned deployment support cloth, An opening is made in the mini-trumpet and hooked onto the tab, A cover member that extends along a predetermined range in the longitudinal direction of the airbag cushion in the aforementioned storage configuration and covers the vehicle interior side wall of the airbag cushion, Equipped with, The deployment assist fabric is held in a state wrapped around the airbag cushion in its stored form by hooking the opening of the mini-trumpet onto the tab. The aforementioned deployment support cloth is A first region formed in the area where the mini-trumpet is provided, In the longitudinal direction of the airbag cushion in the aforementioned storage configuration, a second region is provided adjacent to the first region, and the dimension from the connecting portion to the other side is larger than that of the first region. It has, The curtain airbag device is characterized in that the deployment assist fabric is arranged such that the second region overlaps at least the end of the cover member.

2. The curtain airbag device according to claim 1, characterized in that the mini-trumpet is strip-shaped and attached to the deployment assist fabric such that its opening protrudes from the other side of the deployment assist fabric.

3. The aforementioned connection part connects the mini-trumpet to the airbag cushion together with one side of the deployment assist fabric. The curtain airbag device according to claim 2, characterized in that the dimensions of the first region from the connection portion to the other side are such that they fall within the range from the connection portion to the opening of the mini-trumpet.

4. The mini-trumpet has a weak portion provided in the area between the connecting portion and the opening, which allows the mini-trumpet to break when the airbag cushion inflates and deploys. The curtain airbag device according to claim 3, characterized in that the other side of the first region is located between the vulnerable portion of the mini-trumpet and the opening in the circumferential direction of the airbag cushion in the storage configuration.

5. The curtain airbag device according to claim 1, characterized in that the mini-trumpet is formed integrally with the deployment assist fabric.

6. The curtain airbag device according to claim 4, characterized in that the mini-trumpet has a fragile portion provided at a predetermined location that breaks when the airbag cushion inflates and deploys, separating the area including the opening from the deployment assist fabric.

7. A curtain airbag system comprising an airbag cushion that is rolled up or folded to form a long storage configuration in the front-rear direction of the vehicle and is attached to the upper part of the side wall of the passenger compartment, and an inflator that supplies gas to the airbag cushion, The curtain airbag system further, The inflator insertion section into which the inflator is inserted, A deployment assist cloth that is in the form of a fabric, with one side connected to the airbag cushion in the storage configuration at a predetermined connection point and the other side being free, Equipped with, The aforementioned deployment support cloth is A first region formed on the inflator insertion side in the longitudinal direction of the airbag cushion in the aforementioned storage configuration, In the longitudinal direction, a second region is provided on the side opposite to the inflator insertion portion when viewed from the first region, and the dimension from the connection portion to the other side is larger than that of the first region. A curtain airbag device characterized by having the following features.

8. The curtain airbag device according to any one of claims 1 to 7, characterized in that the other side of the second region protrudes in a stepped manner from the other side of the first region.

9. The curtain airbag device according to any one of claims 1 to 7, characterized in that the other side of the second region is inclined such that the dimensions of the second region gradually widen from the first region.

10. The curtain airbag device according to any one of claims 1 to 7, characterized in that the other side of the first region is inclined such that the dimensions of the first region gradually widen toward the second region.

11. The curtain airbag device according to any one of claims 1 to 7, characterized in that the other side of the deployment support fabric is inclined such that the dimensions of the deployment support fabric gradually widen from the end on the first region side to the end on the second region side.

12. The curtain airbag device according to any one of claims 1 to 4, characterized in that the mini-trumpet is formed of a nonwoven fabric.

13. The curtain airbag device according to claim 4 or 6, characterized in that the vulnerable portion is formed by a slit.

14. The curtain airbag device according to claim 3, characterized in that the connecting portion integrally connects the mini-trumpet, one side of the deployment assist cloth, one end of the tab, and the non-inflated portion of the airbag cushion.

15. The curtain airbag device further includes tapes provided on both sides of the mini-trumpet for wrapping the deployment assist fabric around the airbag cushion in its stored state, The curtain airbag device according to any one of claims 1 to 6, characterized in that the tape is rupturable by the inflation pressure of the airbag cushion.

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