JP5588980B2 - Curtain airbag - Google Patents

Description

  The present invention relates to a curtain airbag that inflates and deploys along a side surface in a vehicle compartment for the purpose of protecting an occupant during a vehicle side collision or rollover (rollover).

  A curtain airbag capable of protecting a passenger's head even when a vehicle shifts from a side collision to a rollover is mainly attached to a roof side rail or the like inside a roof trim above the door. Ordinary curtain airbags are attached in a small state by folding or the like so that they can be attached to a limited storage space.

  The curtain airbag needs to be deployed along the side of the vehicle so as to cover all areas where the passenger's head and upper body may collide. Normally, there are multiple pillars on the side of the vehicle that serve as pillars that support roof side rails, etc., and each pillar has a pillar trim (interior material) made up of cushioning material on the inside of the vehicle. Yes. A gap is formed between the pillar trim and the pillar. For this reason, when the curtain airbag attached to the roof side rail is inflated and deployed downward, the curtain airbag may be caught in the gap and the deployment may be delayed or hindered.

  For example, Patent Document 1 discloses an arrangement structure of a head protection airbag device. This arrangement structure includes airbag bag body deployment direction regulating means, which comprises a metal plate having a bent portion having a L-shaped cross section and a resin plate made of a soft resin having a U-shaped cross section. Become. According to this arrangement structure, the airbag body in the middle of deployment does not come into strong contact with the upper end of the B-pillar garnish (B-pillar trim) or enter between the body and the B-pillar garnish. It is said that the bag can be deployed more smoothly.

JP 2000-33845 A

  However, if it is set as the structure provided with another members, such as metal plates and resin plates, as described in Patent Document 1, the storage space for the curtain airbag, which is originally limited, is further limited. Further, the metal and resin plates increase the manufacturing cost and the weight.

  In view of such problems, the present invention provides a curtain airbag that can be easily inflated and quickly inflated and deployed without interfering with the pillar trim even if the pillar trim is present below the storage position. It is aimed.

  In order to solve the above-mentioned problems, a typical configuration of a curtain airbag according to the present invention is a curtain airbag stored above a side surface in a vehicle compartment, and is located above the curtain airbag and inflated. A main duct that circulates the gas for deployment to the expansion region, and a tab that is partially attached to the outer surface of the main duct in the region of the main duct, and that fixes the curtain airbag to the side wall above the side surface, The main duct is housed above the side surface with the upper edge of the main duct positioned below the position where at least a part of the tab is attached.

  According to the above configuration, the main duct receiving the gas supply earliest is expanded. During the expansion of the main duct, the tabs attached to the area of the main duct itself limit the movement to direct the upper edge vertically upward. The main duct whose movement is restricted expands in a posture extending inward of the vehicle having a horizontally long cross section. The curtain airbag is inflated and deployed along the side of the vehicle after being separated from the storage position toward the vehicle inner side by a main duct that is inflated at an early stage to a position where it does not interfere with the pillar trim. As described above, according to the present invention, it is possible to prevent the interference with the pillar trim located below the curtain airbag storage position with a simple configuration that is easy to store, and to provide a curtain airbag that can be quickly inflated and deployed. Is possible.

  The curtain airbag may be deployed from the storage position toward the direction of separating the side wall by inflating the main duct and pressing the side wall.

  According to the above configuration, the curtain airbag is inflated and deployed along the side surface of the vehicle after being deployed in the direction of separating the side wall from the storage position. Even if the pillar trim exists below the storage position, it can be prevented from interfering with the pillar trim, and can be expanded and deployed quickly.

  The distance from the position where at least a part of the tab in the main duct is attached to the position where the tab is fixed to the side wall may be shorter than the distance from the attachment position to the upper edge of the main duct.

  According to the above configuration, when the main duct is expanded, the movement of the main duct rotating to direct the upper edge portion in the vertical upward direction is further limited.

  At least a part of the tab may be attached to a joint portion on both sides of the base fabric constituting the curtain airbag. Since a small path is formed from the joint portion on both sides to the upper edge of the main duct, it is possible to expand more firmly than a large-diameter path even at the same gas pressure. Along with this, the pressing of the side wall is also improved, and it is possible to quickly extrude without interfering with the pillar trim.

  A part of the tab may be attached to the outer surface of the main duct by joining to one side of the base fabric constituting the curtain airbag. Since the main duct can be expanded and deployed at its original size, the extrusion distance becomes long, and even a pillar trim having a wide gap can be quickly extruded without interference.

  The tab may be fixed to the side wall below the curtain airbag. Of the side wall, the area above the pillar has a limited space for fixing, but it is relatively easy to secure the space for fixing if it is an area below the stored curtain airbag Because there is.

  The tab is fixed to the side wall below the curtain airbag in the vicinity of the pillar in the vehicle interior, and the curtain airbag is partly attached to the non-inflatable region above the main duct except in the vicinity of the pillar. The tab of the other tab may be fixed to the side wall above the curtain airbag. This is because it is easy to secure a space for fixing other than the vicinity of the pillar even in the region above the curtain airbag stored. Moreover, since the load applied to the curtain airbag in the direction of gravity is supported outside the vicinity of the pillar, the curtain airbag can be prevented from sagging or swinging in the stored state.

  The tab may be fixed to the side wall above the curtain airbag. With this configuration, since the curtain airbag is suspended from above by the tab, the curtain airbag does not interfere with the upper tab when the tab is fixed to the side wall. Therefore, the curtain airbag can be easily attached.

  The tab is fixed to the side wall above the curtain airbag in the vicinity of the pillar in the vehicle compartment, and, except for the vicinity of the pillar, the curtain airbag is partially attached to the non-inflatable region above the main duct. A tab may be further provided, and the other tab may be fixed to a side wall below the curtain airbag.

  According to the above configuration, if the space for fixing is easily secured in the vicinity of the pillar, rather, in the upper region of the stored curtain airbag, the mounting operation is easy.

  The tab may be provided with a breaking portion that is broken by a pressure at which the main duct expands. This is because the tab needs to be held when the curtain airbag is deployed (when not deployed) and to be broken when the curtain airbag is deployed.

  The break portion may have one main slit line formed in the tab and a sub slit line formed around the main slit line. With this configuration, the breaking portion becomes weak against the load applied to the tab, and can be broken by suitably using the pressure caused by the expansion of the curtain airbag.

  ADVANTAGE OF THE INVENTION According to this invention, even if a pillar trim exists in the lower side of a storage position with the simple structure which is easy to store, it becomes possible to provide the curtain airbag which expands and deploys rapidly without interfering with the pillar trim.

It is a figure which illustrates the attachment position of the curtain airbag concerning 1st Embodiment of this invention. It is a figure which illustrates the deployment state of the curtain airbag of FIG. It is a figure explaining the tab of FIG. It is a figure explaining the tab of FIG. It is a figure explaining the initial operation | movement of the expansion | deployment of the curtain airbag of FIG. It is a figure explaining the curtain airbag concerning 2nd Embodiment of this invention. It is a figure which illustrates the attachment position of the curtain airbag concerning 3rd Embodiment of this invention. It is a figure explaining the tab of FIG. It is a figure explaining the initial operation | movement of the expansion | deployment deployment of the curtain airbag of FIG. It is a figure which illustrates the attachment position of the curtain airbag concerning 4th Embodiment of this invention. It is a one part enlarged view of FIG. FIG. 3 is an enlarged view of a part of FIG. 2. It is a figure which illustrates the modification of 1st Embodiment. It is a figure explaining the initial stage operation | movement of the expansion | deployment of the curtain airbag of a modification in the AA cross section of FIG.

A1, A2 ... fixing holes D1, D2, D3, D4 ... distance E1 ... openings S1, S2, S3, S4 ... sewing parts L1, L2 ... sewing line 100 ... vehicle 112 ... roof side rail 114 ... A pillar 116 ... B pillar 118 ... C pillar 120 ... pillar trim 130 ... roof trim 200, 300, 400 ... curtain airbag 204 ... inflator 210 ... inflating region 212 ... gas receiving hole 214 ... main duct 216 ... multiple chambers 220 ... non-inflating region 240, 240a, 240b, 240c ... tab 244a ... main slit line 244b ... sub slit line 246 ... fixing member 244, 248 ... fracture part 250 ... reinforcing patch

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.
[First embodiment]

(Curtain airbag installation position)
Drawing 1 is a figure which illustrates the attachment position of the curtain airbag concerning a 1st embodiment. FIG. 1A illustrates the curtain airbag when not deployed, and FIG. 1B illustrates the curtain airbag deployed.

  As shown in FIG. 1A, the curtain airbag 200 according to the present embodiment can be stored above the side surface in the vehicle compartment. The curtain airbag 200 is attached to the roof side rail 112 by a tab 240. Usually, a plurality of pillars exist on the side surface in the vehicle compartment. These pillars are called a front pillar (A pillar 114), a center pillar (B pillar 116), and a rear pillar (C pillar 118) from the front of the vehicle 100. The vehicle interior side of each pillar is covered with a pillar trim composed of a cushioning material or the like to improve the aesthetic appearance in the vehicle.

  As illustrated in FIG. 1B, when a side collision or rollover (rollover) or the like occurs in the vehicle 100, an ignition signal is first sent from a sensor (not shown) provided in the vehicle 100 to the inflator 204 (FIG. 2). Is sent. When the inflating and deploying gas is supplied from the inflator 204, the curtain airbag 200 is inflated and deployed along the side surface in the vehicle compartment by pushing the roof trim 130 (FIG. 5).

(Curtain airbag)
FIG. 2 is a diagram illustrating the deployed state of the curtain airbag 200 of FIG. FIG. 2 illustrates the curtain airbag 200 on the right side as viewed from the vehicle interior side in the traveling direction of the vehicle 100.

  The curtain airbag 200 is formed into a bag shape, for example, by sewing a base fabric constituting the surface of the curtain airbag 200 on the front and back sides or by using OPW (One-Piece Woven).

  The curtain airbag 200 includes an inflatable region 210 that inflates when the vehicle 100 collides or rolls over, a non-inflatable region 220 (indicated by hatching in the figure) that does not inflate and partitions the inflated region 210, and a tab 240. The The expansion region 210 further includes a gas receiving hole 212, a main duct 214, and a plurality of chambers 216.

  The gas receiving hole 21 2 is installed in the upper part of the curtain airbag 200 and receives supply of inflation and deployment gas from the inflator 204. The inflation and expansion gas received by the gas receiving hole 212 flows in the front-rear direction of the gas receiving hole 212, as exemplified by the arrows.

  The main duct 214 serves as a passage through which the inflation and deployment gas flows from the gas receiving hole 212 to the plurality of chambers 216. The main duct 214 is disposed substantially horizontally on the upper part of the curtain airbag 200, and distributes the inflating and deploying gas to the plurality of chambers 216 constituting the inflating region 210.

  The plurality of chambers 216 are expanded by the inflow of the gas for expansion and deployment, and protect the occupant's head from a collision with the side window or the like in an emergency situation such as a collision, or prevent the occupant from jumping out of the vehicle during a rollover. To prevent. In the present embodiment, the plurality of chambers 216 are largely arranged in two ranges corresponding to the seating position of the occupant, and mainly protect the front region that protects the driver's seat occupant and mainly the rear row seat occupant. A distinction can be made in the rear region.

  3 and 4 are diagrams illustrating the tab 240 of FIG. 3 and 4 illustrate the tab 240 in the deployed state of the curtain airbag 200. FIG. The tab 240 is a general term for different types of tabs 240a and 240b.

  The tab 240 is a belt-like member attached to the curtain airbag 200, and fixes the curtain airbag 200 to the roof side rail 112 above the side surface in the vehicle compartment. The tab 240 is fixed to the side wall above the curtain airbag 200. With this configuration, since the curtain airbag 200 is suspended from above by the tab 240, the curtain airbag 200 does not interfere with the upper tab 240 when the tab 240 is fixed to the side wall. Therefore, the curtain airbag 200 can be easily attached.

  As shown in FIG. 3, a part of the tab 240 is attached to the outer surface of the main duct 214 by sewing portions (S1, S2). Two fixing holes are disposed at the end of the tab 240 and can be fixed to the roof side rail 112 by the mounting member 246 (FIG. 5). The mounting member 246 may be a bolt or the like, and may further include an auxiliary member such as a bracket.

  When the curtain airbag 200 is stored, the tab 240 is wound around the curtain airbag 200 wound up and down as shown in FIG. 1A and both ends are fixed to the roof side rail 112. Thus, the curtain airbag 200 is held.

  As shown in FIG. 4, the tab 240 is provided with a breaking portion 244 that is broken by a pressure at which the main duct expands. This is because the tab 240 needs to be broken when the curtain airbag 200 is deployed while it is held when the curtain airbag 200 is stored (not deployed).

  The fracture portion 244 has one main slit line 244a formed in the tab 240 and a sub slit line 244b formed around the main slit line 244a. The main slit line 244 a and the sub slit line 244 b are arranged side by side so that the cuts are alternately positioned in the longitudinal direction of the tab 240. Therefore, the breaking portion 244 is particularly vulnerable to a load applied in the longitudinal direction of the tab 240, and can be broken by suitably using the pressure caused by the expansion of the curtain airbag 200.

  The tab 240 can be formed using a cloth similar to the base cloth constituting the curtain airbag 200. For example, an increase in manufacturing cost can be prevented by molding from an excess portion of the base fabric that is generated when the curtain airbag 200 is manufactured. In addition, in FIG. 2, although the four tabs 240 are illustrated, it is not restricted to this number, You may change suitably according to a vehicle model etc.

  The curtain airbag 200 according to this embodiment includes two types of tabs 240a and 240b. The tab 240a is a tab arranged other than the vicinity of the pillar P (FIG. 11), and is attached to the non-inflatable region 220 above the main duct 214 by the sewing portion S1. On the other hand, the tab 240b that characterizes the present embodiment is a tab disposed in the vicinity of the pillar P, and is disposed on a part of the outer surface of the main duct 214 by the sewing portion S2.

  FIG. 11 is an enlarged view of a part of FIG. As illustrated in FIG. 11, the pillar vicinity P indicates a range of about 50 mm before and after the pillar garnish of the B pillar 116. Accordingly, at least a part of the tab 240b “arranged in the vicinity of the pillar P” is in the range of the vicinity of the pillar P.

  However, the range of the vicinity of the pillar P is merely an example, and depending on the layout of the vehicle, a range of 100 mm or more before and after the pillar garnish may be included in the “near the pillar”.

  FIG. 12 is an enlarged view of a part of FIG. FIG. 12A is a front view, and FIG. 12B is a right side view of FIG. As illustrated in FIG. 12A, the sewing portion S2 of the tab 240b is located on the outer surface of the main duct 214 as described above. Two reinforcing patches 250 are applied to the inside of the base fabric on the front and back of the curtain airbag 200. As illustrated in FIG. 12A, a sewing line L <b> 1 for sewing the reinforcing patch 250 to the base fabric is provided inside the substantially elliptical reinforcing patch 250.

  There is a further elliptical sewing line L2 at the center of the reinforcing patch 250, which sews the base fabric on the front and back of the curtain airbag 200 together with the reinforcing patch. Therefore, the inside of the ellipse-shaped sewing line L2 is a non-inflatable region into which the inflating and expanding gas cannot enter, as illustrated in FIG. As illustrated in FIG. 12A, the sewn portion S <b> 2 of the tab 240 b is located inside this non-inflatable region, and thus the force due to the inflation of the airbag 200 is difficult to act. The structure is difficult to come off.

(Operation of curtain airbag)
FIG. 5 is a view for explaining the initial operation of the inflation and deployment of the curtain airbag 200 of FIG. FIG. 5 is a cross-sectional view of the curtain airbag 200 attached to the vehicle 100 at the position of the tab 240b.

  As shown in FIG. 5A, the curtain airbag 200 can be attached to the roof side rail 140 inside the roof trim 130 and above the side surface in the vehicle compartment. At this time, the curtain airbag 200 is attached with the upper edge portion 218 of the main duct 214 positioned below the sewing portion S2 that is the attachment position of the tab 240b.

  When inflated and deployed gas is supplied from the inflator 204 (FIG. 2) to the curtain airbag 200 in the housed state, first, as shown in FIG. 244 breaks. At this time, the expansion of the curtain airbag 200 occurs from the upper edge side of the main duct 214 that is directly connected to the gas receiving hole 212. Since a gap is formed between the pillar and the pillar trim 120 in the vicinity of the pillar P, when the curtain airbag 200 is inflated and deployed downward from the storage position, the curtain airbag 200 is caught in the gap and deployment is delayed, or May not be able to deploy.

  However, in the curtain airbag 200 according to the present embodiment, when the main duct 214 is inflated, the main duct 214 attempts to direct the upper edge portion 218 vertically upward during the inflation by the tab 240b attached to its own region. Movement is limited. Therefore, the main duct 214 is not vertically elongated in cross section, but expands in a posture that extends inward of the vehicle having a horizontally long cross section.

  Since the sewn portion S2 is attached to the outer surface of the main duct 214 by stitching (joining) both surfaces of the base fabric constituting the curtain airbag 200, the upper edge of the main duct 214 is sewn from the sewn portion S2. A small path 230 is formed over the portion 218. When the small path 230 is inflated and deployed, a portion below the vehicle is pressed from the small path 230. The curtain airbag 200 is inflated and deployed along the side surface of the vehicle after being separated from the storage position by a predetermined distance in the direction of detaching the roof side rail 112 by the main duct 214 thus inflated. At this time, the roof trim 130 existing in the direction of separation from the roof side rail 140 is pressed by the curtain airbag 200.

  As described above, the compression of the roof trim 130 by the curtain airbag 200 causes the opening E <b> 1 between the roof trim 130 and the pillar trim 120. As shown in FIG. 5C, the curtain airbag 200 can be inflated and deployed downward from the opening E1.

  According to the above configuration, the curtain airbag 200 according to the present embodiment is originally inflated and deployed right below the storage position, but the sewn portion S2 of the tab 240b exists in the region 214 of the main duct. Thus, after separating from the storage position toward the inside of the vehicle to a position where it does not interfere with the pillar trim 120, the vehicle is inflated and deployed along the vehicle side surface. As described above, according to the present embodiment, it is possible to prevent the interference with the pillar trim 120 located below the storage position of the curtain airbag 200 with a simple configuration that is easy to store, and to rapidly inflate and deploy.

  As illustrated in FIG. 3, the tab 240b has two fixing holes. Among them, the distance D2 from the fixing hole A1 that does not have the breaking portion 244 between the sewing portion S2 and the sewing portion S2 is from the sewing portion S2 to the upper edge portion 218 of the main duct 214. It is shorter than the distance D1. Therefore, the distance between the sewing portion S2 and the attachment member 246 in FIG. 5 (corresponding to the short distance D2 in FIG. 3) is the distance between the sewing portion S2 and the upper edge portion 218 (corresponding to the long distance D1 in FIG. 3). Shorter. At the time of inflating and expanding, the main duct 214 rotates clockwise so as to direct the upper edge portion 218 in the vertical upward direction. That is, in the almond-shaped path 230, a mechanical action is generated to rotate the upper edge 218 in the vertical upward direction.

  However, when such rotation occurs, a tension is generated in the portion between the sewn portion S2 and the mounting member 246 (corresponding to the short distance D2 in FIG. 3) of the tab 240b due to the above-described distance difference. While the tension is maintained between the sewn portion S2 and the mounting member 246 of the tab 240b, further rotation of the main duct 214 sewn to the tab 240b at the sewn portion S2 is restricted. Therefore, the main duct 214 expands in a posture extending inward of the vehicle having a horizontally long cross section.

  FIG. 13 is a diagram illustrating a modification of the first embodiment. In the first embodiment, one tab is arranged in the vicinity of the pillar P as illustrated in FIG. 11, but in the modified example, the same type of tab 240b is provided before and after the pillar garnish as shown in FIG. .

  FIG. 14 is a diagram for explaining an initial operation of inflating and deploying a curtain airbag 200 according to a modification, taken along the line AA in FIG. Note that the tab 240b and the attachment member 246 that are displaced in the front-rear direction are visible as entities in FIG. 14, but are not in the pillar position, and are therefore indicated by broken lines for convenience of illustration.

  As illustrated in FIG. 14, small paths 230 indicated by two-dot chain lines are formed at the positions of the two tabs 240 b before and after the pillar garnish. A similar shaped chamber 231 is formed between the two tabs 240b by being influenced by the shape of the small-diameter path 230. Since the chamber 231 extends the main duct 214 toward the vehicle inner side at the pillar position, the main duct 214 extends toward the vehicle inner side even if the two tabs 240b are not disposed near the pillar P as shown in FIG. There is an effect. In addition, since the number of installation places of the same type of tab 240b increases, the development is performed with more stable behavior.

[Second Embodiment]
FIG. 6 is a view for explaining a curtain airbag 300 according to the second embodiment of the present invention. 6 illustrates a cross section at the position of the tab 240b of the curtain airbag 300 attached to the vehicle 100, as in FIG. In the first embodiment, the tabs 240 b are attached to the outer surface of the main duct 214 by stitching both sides of the base fabric constituting the curtain airbag 200. On the other hand, in the second embodiment, the tab 240b is attached to the outer surface of the main duct 214 by joining (sewing) to one side of the base fabric constituting the curtain airbag 300.

  As illustrated in FIG. 6A, when the inflating and deploying gas is supplied from the inflator 204 (FIG. 2) to the curtain airbag 300 in the housed state, first, the tab 240 b is expanded as the curtain airbag 200 is inflated. The fracture | rupture part 244 fractures | ruptures (FIG.6 (b)).

  Also in the curtain airbag 300 according to the present embodiment, as illustrated in FIG. 6B, when the main duct 214 is inflated, the main duct 214 is inflated by the tab 240b attached to its own region during the inflation. The movement to direct the part 218 in the vertically upward direction is restricted. Therefore, the main duct 214 is not vertically long in cross section but is expanded in a posture extending inwardly in the cross section of the vehicle, and has the same effect as that of the first embodiment as illustrated in FIG. 6C.

  At this time, since the sewing portion S3 is present on one side, the main duct 214 can be inflated and deployed at its original size. As a result, the curtain airbag 300 can have a longer extrusion distance, and even a pillar trim with a wide gap can be prevented from interfering and rapidly inflated and deployed downward from the opening E1.

[Third embodiment]
A third embodiment of the curtain airbag according to the present invention will be described. In addition, about the part which overlaps with the said 1st Embodiment or 2nd Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the first embodiment, the tab 240 is fixed to the roof side rail 112 above the curtain airbag 200 (FIG. 1A). However, since the inside of the roof trim 130 is generally a very limited space, it may be difficult to secure the mounting position on the roof side rail 112. However, the curtain airbag according to the present embodiment can fix the tab 240b not only on the upper side of the curtain airbag but also on the lower side.

  FIG. 7 is a diagram illustrating the attachment position of the curtain airbag according to the third embodiment of the present invention. FIG. 7 illustrates the curtain airbag 400 when it is not deployed. As illustrated in FIG. 7, the curtain airbag 400 according to the present embodiment has a roof side rail 112 on the lower side of the curtain airbag 400 in the vicinity P of each pillar (for example, in the vicinity of the B pillar 116 and the C pillar 118). It has a tab 240c fixed to.

  As illustrated in FIG. 7, the curtain airbag 400 has tabs 240 a other than the vicinity of the pillars P fixed to the side wall above the curtain airbag 400. This is because, except for the vicinity of the pillar P, it is easy to secure a fixing space even in the region above the curtain airbag 400 stored therein. Moreover, since the load applied to the curtain airbag 400 in the gravitational direction is supported except in the vicinity of the pillar P, the curtain airbag 400 sags in the stored state even if the tab 240c is fixed to the lower side. And swinging can be prevented.

  Moreover, the curtain airbag 400 may fix all the tabs to its lower roof side rail like the tab 240c. Of the roof side rail 112, the space above the pillar is limited in the space for fixing. If the space is lower than the curtain airbag 400 stored therein, the space for fixing is relatively small. It is because it is easy to secure.

  FIG. 8 is a diagram illustrating the tab 240c of FIG. The curtain airbag 400 according to this embodiment includes two types of tabs 240a and 240c. The tab 240c is a tab 240 arranged in the vicinity of the pillar P (for example, in the vicinity of the B pillar 116 and the C pillar 118). The tab 240c is disposed on a part of the outer surface of the main duct 214 by the sewing portion S4.

  The tab 240c has two fixing holes. Among them, the distance D4 from the fixing hole A2 that does not have the breaking portion 248 between the sewing portion S4 and the sewing portion S4 is from the sewing portion S4 to the upper edge portion 218 of the main duct 214. It is shorter than the distance D3. The fracture portion 248 has the same configuration as that of the fracture portion 244, and has the same effect as the fracture portion 244.

  FIG. 9 is a view for explaining an initial operation of inflation and deployment of the curtain airbag 400 of FIG. FIG. 9 is a cross-sectional view of the curtain airbag 400 attached to the vehicle 100 at the position of the tab 240c.

  As illustrated in FIG. 9A, the curtain airbag 400 includes a tab 240c fixed to the roof side rail 112 on the lower side thereof. At this time, the curtain airbag 400 is attached with the upper edge portion 218 of the main duct 214 positioned below the sewing portion S4 that is the attachment position of the tab 240c.

  When the inflating and deploying gas is supplied from the inflator 204 (FIG. 2) to the curtain airbag 400 in the housed state, the tab 240c is first broken as the curtain airbag 400 is inflated, as illustrated in FIG. 9B. Part 248 breaks. Further, the clockwise rotation of the main duct 214 is caused by the generation of tension in the portion of the tab 240c between the sewing portion S4 and the attachment member 246 (corresponding to the short distance D4), thereby further rotating operation. Limited.

  Also in the curtain airbag 400 according to the present embodiment, the main duct 214 is restricted from moving toward the upper edge portion 218 in the vertical upward direction during expansion by the tab 240c attached to its own region. . The main duct 214 is not vertically long in cross section but is expanded in a posture extending inwardly in the cross section of the vehicle, and has the same effect as that of the first embodiment as illustrated in FIG. 9C.

  Then, the curtain airbag 400 is separated from the storage position by a predetermined distance toward the inside of the vehicle by a small path 230 configured from the sewing portion S4 to the upper edge portion 218, and presses the roof trim 130. As a result, an opening E1 is generated, and the curtain airbag 400 can be inflated and deployed downward from the opening E1, as illustrated in FIG. 9C.

  According to the above configuration, also in the curtain airbag 400 according to the present embodiment, the pillar trim 120 is provided from the storage position toward the vehicle inner side because the sewing portion S4 of the tab 240c exists in the region of the main duct 214. And then expand and deploy along the side of the vehicle. As described above, the curtain airbag 400 according to this embodiment can be quickly inflated and deployed without interfering with the pillar trim 120 located below the storage position of the curtain airbag 400 with a simple configuration that is easy to store.

  In the above description, both sides of the base fabric constituting the curtain airbag 400 are stitched and the tab 240c is attached to the outer surface of the main duct 214. However, the present invention is not limited to this. As in the first embodiment, the tab 240c Alternatively, the curtain airbag 400 may be attached to the outer surface of the main duct 214 by sewing to one side of the base fabric constituting the curtain airbag 400.

[Fourth embodiment]
A fourth embodiment of the curtain airbag according to the present invention will be described. In addition, about the part which overlaps with said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 10 is a diagram illustrating the attachment position of the curtain airbag according to the fourth embodiment of the present invention. As illustrated in FIG. 10, the curtain airbag 500 has a tab 240 a fixed to the upper side of the curtain airbag 500 in each pillar vicinity P, and the side wall below the curtain airbag 500 except for the pillar vicinity P. It has a tab 240c fixed to. According to this configuration, if the space for fixing is easily secured in the upper region of the curtain airbag 500 accommodated in the vicinity of the pillar P, the mounting operation is easy. Also in this embodiment, the same effects as in the above embodiment can be obtained.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the embodiments described above are preferred examples of the present invention, and other embodiments can be implemented or performed in various ways. Can be carried out. The invention is not limited to the detailed shape, size, configuration, and the like of the components shown in the accompanying drawings unless otherwise specified in the present specification. In addition, expressions and terms used in the present specification are for the purpose of explanation, and are not limited thereto unless otherwise specified.

  Therefore, it is obvious for those skilled in the art that various changes and modifications can be conceived within the scope of the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  For example, the curtain airbag according to the present invention is, in other words, a curtain airbag that is housed above the side surface in the vehicle compartment, and is located above the curtain airbag and distributes the inflation and deployment gas to the inflation region. A main duct that is attached to a position a predetermined distance inward from the upper edge of the main duct, and has a break portion that is broken by the pressure at which the main duct is inflated. A strip-shaped tab fixed to the side wall above the side surface in the vehicle compartment, and the upper edge of the main duct is below the position where the tab is fixed to the side wall when the main duct expands. This may be a feature.

  Moreover, in the said embodiment, although the example which applied the curtain airbag concerning this invention to the motor vehicle was demonstrated, it is also possible to apply to an aircraft, a ship, etc. besides a motor vehicle, and can obtain the same effect. it can.

  INDUSTRIAL APPLICABILITY The present invention can be used for a curtain airbag that inflates and deploys along a side surface in a vehicle compartment for the purpose of protecting an occupant during a vehicle side collision or rollover (rollover).

Claims (11)

A curtain airbag stored above a side surface in a vehicle compartment,
The curtain airbag
An expansion region that expands when a vehicle collides or rolls over;
A non-inflatable region defining the inflatable region;
A tab for fixing the curtain airbag to the side wall above the side surface,
With
The expansion region is
Multiple chambers protecting the occupant;
A main duct located at the top of the curtain airbag for circulating the inflation and deployment gas to the plurality of chambers;
Have
The tab is part of the outer surface of the main duct is mounted in the region of the main duct a band, holding the curtain airbag wrapped around the curtain airbag wound, said tab The both ends in the longitudinal direction are fixed to the side wall above the side surface part, and the wound curtain airbag is suspended from the side wall,
The curtain duct is characterized in that the main duct is housed above the side surface with the upper edge of the main duct positioned below a position where at least a part of the tab is attached.   The curtain air bag according to claim 1, wherein the tab is fixed to the side wall above the curtain airbag. A curtain airbag stored above a side surface in a vehicle compartment,
A main duct that is located above the curtain airbag and circulates the gas for inflation and deployment to the inflation region;
A tab that is partly attached to the outer surface of the main duct in the area of the main duct, and that fixes the curtain airbag to the side wall above the side surface;
With
The main duct is stored above the side surface with the upper edge of the main duct positioned below a position where at least a part of the tab is attached. The tab is located on the lower side of the curtain airbag. A curtain airbag fixed to a side wall. A curtain airbag stored above a side surface in a vehicle compartment,
A main duct that is located above the curtain airbag and circulates the gas for inflation and deployment to the inflation region;
A tab that is partly attached to the outer surface of the main duct in the area of the main duct, and that fixes the curtain airbag to the side wall above the side surface;
With
The main duct is stored above the side surface with the upper edge of the main duct positioned below a position where at least a part of the tab is attached. The tab is located near the pillar in the vehicle compartment. Fixed to the side wall below the airbag,
Outside the vicinity of the pillar, the curtain airbag further includes another tab partly attached to a non-inflatable region above the main duct, and the other tab is the side wall above the curtain airbag. Curtain airbag characterized by being fixed to A curtain airbag stored above a side surface in a vehicle compartment,
A main duct that is located above the curtain airbag and circulates the gas for inflation and deployment to the inflation region;
A tab that is partly attached to the outer surface of the main duct in the area of the main duct, and that fixes the curtain airbag to the side wall above the side surface;
With
The main duct is stored above the side surface with the upper edge of the main duct positioned below a position where at least a part of the tab is attached. The tab is located near the pillar in the vehicle compartment. Fixed to the side wall above the airbag,
Outside the vicinity of the pillar, the curtain airbag further includes another tab partly attached to a non-inflatable region above the main duct, and the other tab is located on the lower side of the curtain airbag. A curtain airbag fixed to a side wall.   6. The curtain airbag according to claim 1, wherein the curtain airbag is deployed from a storage position in a direction of detaching the side wall by inflating the main duct and pressing the side wall. The curtain airbag described in 1.   The distance from the position where at least a part of the tab in the main duct is attached to the position where the tab is fixed to the side wall is shorter than the distance from the attachment position to the upper edge of the main duct. The curtain airbag according to any one of claims 1 to 6.   The curtain airbag according to any one of claims 1 to 7, wherein at least a part of the tab is attached to a joint portion on both surfaces of a base fabric constituting the curtain airbag.   The part of the tab is attached to the outer surface of the main duct by being joined to one side of a base fabric constituting the curtain airbag. Curtain airbag.   The curtain airbag according to any one of claims 1 to 9, wherein the tab is provided with a breaking portion that is broken by a pressure at which the main duct is expanded.   11. The curtain airbag according to claim 10, wherein the break portion includes one main slit line formed in the tab and a sub slit line formed around the main slit line.

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