JP2019084837A - Curtain airbag device - Google Patents

Abstract

To provide a curtain airbag device which can reduce injury value to a crew member when the crew member comes into contact with a chamber at emergency.SOLUTION: The curtain airbag device 100 is a curtain airbag device which comprises a bag-like cushion 104 which expands and spreads along a side wall of a vehicle body within a cabin by utilizing gas. The cushion comprises inside the car base fabric 130 and outside the car base fabric 132, a sewing part 134 which sews inside the car base fabric and outside the car base fabric and partitions a first chamber 138 in which contact with the crew member is assumed at emergency and a coupling part 136 which couples inside the car base fabric to outside the car base fabric partially. The coupling part contains a desorption part 140 which is provided in the first chamber and reduces volume of the first chamber. The desorption part ruptures when inner pressure of the first chamber exceeds prescribed value at emergency and reduces the inner pressure by increasing the volume of the first chamber.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a curtain airbag apparatus provided with a cushion that inflates and deploys along the upper side of a vehicle cabin for the purpose of protecting an occupant at the time of a side collision or rollover (lateral rollover) of the vehicle.

  The curtain airbag device has a bag-like cushion that is inflated and deployed by gas in an emergency to receive and protect the occupant. The cushion needs to be deployed along the sides of the vehicle to cover all areas where the occupant's head and upper body may collide, even if the vehicle transitions from a side collision to a rollover. is there.

  The cushion is divided into a plurality of small rooms (chambers) serving as an expansion area by, for example, a sewn portion that sews an inboard base fabric and an outboard base fabric that form the surface of the cushion. In the cushion, the base cloths are adhered to each other with an adhesive in the sewn part in order to reinforce the sewn part that divides the chamber assumed to be in contact with the occupant in an emergency or to reduce the gas leak from the sewn part. Is adopted (for example, patent document 1).

  Patent Document 1 describes an airbag formed by superposing a pair of base fabrics into a bag shape. The air bag is integrally sewn (stitched) in a state where adhesive silicone is sandwiched between the overlapping portions. Since the air bag of Patent Document 1 has a structure in which gas leakage from the seam of the seamed portion is sealed by adhesive silicone, high pressure resistance is secured by stitching, and excellent airtightness can be obtained by adhesive silicone, There is.

JP, 2006-327521, A

  However, the air bag of patent document 1 only aims at reinforcement of a sewing part, and the improvement of airtightness using adhesive silicone. That is, in Patent Document 1, no countermeasure is taken regarding the possibility that the injury value of the occupant may become high if the internal pressure of the chamber assumed to be in contact with the occupant in an emergency becomes too high.

  An object of the present invention is to provide a curtain airbag device capable of reducing an injury value to the occupant when the occupant contacts the chamber in an emergency.

  In order to solve the above-mentioned subject, a typical composition of a curtain airbag device concerning the present invention is a curtain airbag device provided with a bag-like cushion inflate-deployed along a vehicle body side wall in a vehicle interior using gas. And the cushion comprises a vehicle-side base fabric and a vehicle-side base fabric, and a sewn portion which sews the vehicle-side base fabric and the vehicle-side base fabric and defines a first chamber where contact with the occupant is expected in an emergency. And a connecting part partially connecting the inboard base cloth and the outboard base cloth, the connecting part including a desorbing part provided in the first chamber to reduce the volume of the first chamber; The part is broken when the internal pressure of the first chamber exceeds a predetermined value in an emergency, and the internal pressure is decreased by increasing the volume of the first chamber.

  According to the above configuration, the desorption portion included in the coupling portion usually couples the inboard base fabric to the outboard base fabric so as to reduce the volume of the first chamber. On the other hand, in an emergency, when the internal pressure of the first chamber exceeds a predetermined value, the desorption unit releases (ruptures) the bond between the inboard base cloth and the outboard base cloth to increase the volume of the first chamber to Reduce Here, the predetermined value of the internal pressure of the first chamber is a pressure value in a state in which the first chamber is completely filled with gas in an emergency. Then, it is assumed that the internal pressure of the first chamber exceeds a predetermined value when an occupant contacts the first chamber in an emergency. In the above configuration, when the internal pressure of the first chamber exceeds a predetermined value, the internal pressure of the first chamber can be reduced by the breakage of the desorption part. That is, when the occupant comes in contact with the first chamber in an emergency, the internal pressure of the first chamber decreases, and the injury value to the occupant can be reduced.

  The detachable portion is located along the sewn portion on the first chamber side of the sewn portion, and the joint portion is further located on the opposite side of the detachable portion along the sewn portion and becomes an integrated strip with the detachable portion It is good to include the reinforcement part.

  Among the coupling portions, the desorption portion breaks when the internal pressure of the first chamber exceeds a predetermined value in an emergency, so the volume of the first chamber increases and the internal pressure of the first chamber can be decreased. The predetermined value of the internal pressure of the first chamber can be adjusted by changing the dimension of the width of the desorption part.

  On the other hand, the reinforcing part of the coupling part is located on the opposite side of the detachable part along the sewn part, that is, on the outside of the first chamber. For this reason, the reinforcing portion does not break because it does not directly receive the internal pressure of the first chamber in an emergency. Therefore, according to the above configuration, the side of the sewn part that divides the first chamber that does not face the first chamber can be reinforced by the reinforcing part, and the airtightness can be further improved.

  The above-mentioned desorption part may be provided in the shape of an island in the position estranged from the sewing part in the 1st chamber. In the above configuration, the desorption portion is provided in an island shape in the first chamber, whereby the volume of the first chamber can be reduced at normal times. When the internal pressure of the first chamber exceeds a predetermined value in an emergency, the island-like desorption part is broken, and the volume of the first chamber can be increased to lower the internal pressure. The predetermined value of the internal pressure of the first chamber can be adjusted by changing the number and size of the island-like desorption parts.

  In order to solve the above problems, another typical configuration of the curtain airbag device according to the present invention is a curtain airbag provided with a bag-like cushion that inflates and deploys along a vehicle body side wall inside a vehicle using gas. In the device, the cushion sews the inboard base fabric and the outboard base fabric, and the inboard base fabric and the outboard base fabric, and the first chamber and the second chamber in which contact with the occupant is assumed in an emergency And a sewn portion forming a gas introduction port for introducing a gas from the first chamber to the second chamber in an emergency and inflating and deploying the second chamber later than the first chamber, an in-vehicle base fabric and an out-vehicle substrate And a joint portion partially coupled to the cloth, the joint portion including a closing portion provided in the gas inlet and closing the gas inlet, wherein the closing portion has an internal pressure of the first chamber which is predetermined in an emergency If it exceeds the value, it breaks and gas And wherein reducing the inner pressure of the first chamber by opening the mouth.

  According to the above configuration, the closing portion included in the coupling portion normally closes the gas introduction port for introducing the gas from the first chamber to the second chamber. Therefore, in an emergency, gas is first introduced into the first chamber, and the internal pressure of the first chamber rises to a predetermined value. Next, when the occupant comes in contact with the first chamber in an emergency and the internal pressure exceeds a predetermined value, the closing portion is broken and the gas inlet is opened. As a result, the gas is introduced from the first chamber to the second chamber through the gas inlet, and the internal pressure of the first chamber decreases. Therefore, according to the above configuration, when an occupant comes in contact with the first chamber in an emergency, an injury value to the occupant can be reduced. Furthermore, since the second chamber can be expanded and deployed with a delay more reliably than the first chamber, it can function as a so-called delay chamber.

  The aforementioned bonding portion may be formed of a heat-welded cloth which is superposed between the inboard base cloth and the outboard base cloth and adhered to the inboard base cloth and the outboard base cloth by heating. In this way, it is possible to bond the in-vehicle base fabric and the in-vehicle base fabric only by applying heat to the heat-welding fabric in a state in which the heat-welding fabric is overlapped between the in-vehicle base fabric and the in-vehicle base fabric.

  The heat-welded fabric described above may be formed of a ductile fabric material comprising a plurality of polymeric fibers, and at least a portion of the polymeric fibers may comprise polymeric resin fibers that fuse together. Thereby, as a material of a heat-welding cloth, the felt containing a polymer resin fiber is mentioned. Since the felt is physically bonded to the base fabric, the adhesive strength is weaker than that of a commonly used adhesive such as a silicone adhesive, that is, an adhesive chemically bonded to the base fabric. For this reason, when a felt is used as the heat-welded cloth, responsiveness to pressure change is good, and when the internal pressure of the first chamber exceeds a predetermined value, it can be broken rapidly.

  The heat-welded fabric described above may be bonded to either the inboard base fabric or the outboard base fabric in a broken state. As described above, if the heat-welded fabric is broken, it is possible to reinforce the vehicle-side fabric or the vehicle-side fabric if it is adhered to either the vehicle-side fabric or the vehicle-side fabric.

  The heat-welded fabric may be separated in a broken state into a first portion bonded to the inboard base fabric and a second portion bonded to the outboard base fabric. As described above, when the heat-welded cloth is broken, the inboard base cloth can be reinforced at the first part and the outboard base cloth can be reinforced at the second part if the first part and the second part are separated.

  According to the present invention, it is possible to provide a curtain airbag device capable of reducing an injury value to the occupant when the occupant contacts the chamber in an emergency.

It is the schematic which illustrates the curtain airbag apparatus in 1st Embodiment of this invention. It is a figure which illustrates the initial state of expansion deployment of the curtain airbag apparatus of FIG. It is a figure which illustrates a curtain airbag apparatus when the internal pressure of the 1st chamber in the cushion of FIG. 2 exceeds predetermined value. FIG. 5 illustrates the cross section of the cushion of FIGS. 2 and 3; It is a figure which illustrates the modification of the coupling | bond part of FIG.4 (b). It is the schematic which illustrates the curtain airbag apparatus in 2nd Embodiment of this invention. FIG. 7 is a view illustrating a cross section of the cushion of FIG. 6; It is the schematic which illustrates the curtain airbag apparatus in 3rd Embodiment of this invention. It is a figure which illustrates a curtain airbag apparatus when the internal pressure of the 1st chamber in the cushion of FIG. 8 exceeds predetermined value.

  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 and the like shown in the embodiments are merely examples for facilitating the understanding of the invention, and the invention is not limited except as otherwise described. In the present specification and drawings, elements having substantially the same functions and configurations are denoted by the same reference numerals to omit repeated description, and elements not directly related to the present invention are not illustrated. Do.

First Embodiment
FIG. 1 is a schematic view illustrating a curtain airbag device according to a first embodiment of the present invention. In the figure, the time of non-deployment (when stored) of the curtain airbag device is illustrated. Although the curtain airbag device illustrated in the drawings is for the right side of the vehicle, the curtain airbag device for the left side not shown also has the same symmetrical structure.

  The curtain airbag device 100 includes an inflator 102 which is a gas generator. In the curtain airbag device 100, the cushion 104 is inflated and deployed by the pressure of the gas supplied from the inflator 102 in an emergency such as a side collision, thereby restraining the occupant. The cushion 104 is formed in a bag shape, for example, by sewing a base fabric constituting the surface on the front and back or by using OPW (One-Piece Woven).

  Vehicle 106 is a two-row seat vehicle in which front seat 108 and rear seat 110 are arranged from the front of the vehicle. Side windows 112 and 114 are installed on the side of the vehicle 106 from the front of the vehicle. In the vehicle longitudinal direction of each side window 112, 114, a pillar (pillar) supporting a roof (ceiling) is provided. These pillars are called a front pillar 116, a center pillar 118, and a rear pillar 120 from the front of the vehicle 106.

  The vehicle 106 further includes a roof side rail 122 and a cover 124 that covers the roof side rail 122 from the inside of the vehicle. In the drawing, the cover 124 is indicated by a two-dot chain line. The roof side rail 122 is located on the upper side of the vehicle compartment of the vehicle 106 and forms a side wall of the vehicle 106.

  The cushion 104 is housed between the roof side rail 122 and the cover 124 in a state of being rolled (rolled) or folded over the entire vehicle longitudinal direction. The cushions 104 housed in these limited storage spaces are attached to the upper side of the vehicle interior by a plurality of tabs 126. Further, a strap 128 is attached to the cushion 104. The strap 128 is a string-like member, with its front end attached to the front pillar 116 and its rear end attached to the front end of the cushion 104.

  FIG. 2 is a view illustrating the initial state of the inflation and deployment of the curtain airbag device 100 of FIG. The cushion 104 includes an inboard base fabric 130 and an outboard base fabric 132 (see FIG. 4), a sewn portion 134, and a connecting portion 136 hatched in FIG. The inboard base cloth 130 and the outboard base cloth 132 are preferably a plastic cloth, for example, a cloth formed by interlacing warps and wefts of polyamide fibers. The fabric may also be coated with a thermoplastic material.

  In FIG. 2, a sewing portion 134 indicated by an alternate long and short dash line sews the inboard base cloth 130 and the outboard base cloth 132 to define the first chamber 138. The first chamber 138 is a portion where contact with the occupant is expected in an emergency.

  The connecting portion 136 is formed in a strip shape along the sewing portion 134 across the sewing portion 134 as illustrated, and partially connects the inboard base fabric 130 and the outboard base fabric 132. The bonding portion 136 is formed of, for example, a heat-welding cloth, is overlapped between the inboard base cloth 130 and the outboard base cloth 132, and is bonded to the inboard base cloth 130 and the outboard base cloth 132 by heating. Be done.

  Here, the material of the coupling portion 136 will be described. The bonding portion 136 is formed of a ductile cloth material including a plurality of polymer fibers, and at least a part of the polymer fibers are formed by fusing together, and the form of a non-woven material includes a plurality of polymer fibers as an example. Can be taken. As the non-woven fabric, a felt-like one (for example, polyester felt) can be used. Polyester felts are manufactured by the known needle process in which polyester fibers are entangled by needle processing and secured to one another. The polyester fibers are provided as polyethylene terephthalate (PET) and the felt material can be made of 100% PET.

  The fibers that make up the felt material intertwine with one another randomly or pseudo-randomly. Also, the felt can include fibers of two different configurations. All of the monocomponent fibers constituting the felt can be formed of a PET homopolymer, but can also be a bicomponent composite fiber having a core and a coating surrounding it. The core of the bicomponent composite fiber and the coating are configured to have different properties, in particular having different melting points, and the coating has a significantly lower melting point than the core (e.g. in the range of 120-150 <0> C). All bicomponent composite fibers can also be formed of PET, but the core can be molded of PET homopolymer and the coating can be formed of PET copolymer (coPET). Such a combination of PET and coPET makes it possible to ensure that the fibers are made entirely of PET, although the melting point of the coating is lower than that of the core.

  Since the core of the bicomponent composite fiber and the monocomponent fiber are both formed of PET homopolymer, they have the same melting point as each other, and the monocomponent fiber has a higher melting point than the coating of the bicomponent composite fiber Become. The bicomponent composite fibers are evenly distributed throughout the monocomponent fibers in the felt material. The bicomponent composite fibers can account for 30% to 60% of the total fibers of the felt material, with the remainder being all monocomponent fibers.

  Next, a method of forming the coupling portion 136 will be described. A felt material, which is a material of a heat-welded fabric, is stacked between the inboard base fabric 130 and the outboard base fabric 132 of the cushion 104 to form an intermediate package. The pressing apparatus (not shown) then applies heat to the intermediate package, for example, to a temperature above the melting point of the bicomponent composite fiber coating but below the core of the bicomponent composite fiber as well as the monocomponent fibers. To work. It is not essential to simultaneously apply heat and pressure to the package.

  The felt material compresses the fibers together when compressed, causing the felt material to thin (e.g., 0.55 mm) and in any event plastically deform. More specifically, heating to a temperature above the melting point of the bicomponent composite fiber coating causes the coating to dissolve. Thus, the coatings fuse together at all points in the binder where the fibers are distributed. Here, since the binder is heated at a temperature lower than the melting point of the core of the bicomponent composite fiber and the entire structure of the monocomponent fiber, the core and the monocomponent fiber remain solid and do not fuse with each other. Only the material fuses.

  Thus, the bonding portion 136 formed of the heat-welding cloth using the felt material is adhered (heat-sealed) to the inboard base cloth 130 and the outboard base cloth 132. Then, the sewn portion 134 is formed by sewing using a sewing machine in a bonded state. However, the present invention is not limited thereto. After forming the sewn portion 134 using a sewing machine in a state where the joint portion 136 is overlapped between the inboard base cloth 130 and the outboard base cloth 132, the joint portion 136 is heated by heating. It may be adhered to the inboard base cloth 130 and the outboard base cloth 132.

  Here, since the felt material is physically bonded between the inboard base fabric 130 and the outboard base fabric 132 as described above, it is chemically bonded between, for example, a commonly used silicone-based adhesive or base fabric. Adhesive strength is weaker than adhesive. Therefore, when the bonding portion 136 is formed of a heat-welding cloth using a felt material, the response to pressure change is good, and the details will be described later, but when the internal pressure of the first chamber 138 exceeds a predetermined value, the bonding portion 136 Can be quickly broken. If a silicone-based adhesive is used for the sewn portion 134, it will take about 24 hours to dry the silicone, and it will take time to produce the cushion 104. Furthermore, by performing sewing after drying of silicone, deterioration of the sewing needle proceeds due to the friction between the sewing needle and silicone.

  The coupling portion 136 includes a detachable portion 140 and a reinforcing portion 142 as shown in FIG. 2, which are integrally formed in a strip shape along the sewing portion 136. The detachable portion 140 is located on the first chamber 138 side of the sewing portion 136 and is provided in the first chamber 138. As shown in the drawing, the detachable portion 140 has a width of the dimension Wa, and reduces the dimension in the vertical direction of the first chamber 138 by the dimension 2 × Wa at the top and bottom to make the dimension La. It is reducing the volume. The reinforcing portion 142 is located on the opposite side of the detachable portion 140, ie, outside the first chamber 138 along the sewn portion 134, and is not provided in the first chamber 138.

  FIG. 3 is a diagram illustrating the curtain airbag device 100 when the internal pressure of the first chamber 138 in the cushion 104 of FIG. 2 exceeds a predetermined value. FIG. 4 is a diagram illustrating a cross section of the cushion 104 of FIGS. 2 and 3. FIG. 4A and FIG. 4B are views respectively showing an AA cross section of FIG. 2 and a BB cross section of FIG. 3.

  Since the desorption part 140 is provided in the first chamber 138, it breaks as shown in FIG. 3 when the internal pressure of the first chamber 138 exceeds a predetermined value in an emergency. In FIG. 3, in order to clearly show the fractured portion of the coupling portion 136, that is, the desorption portion 140, the desorption portion 140 is not hatched. On the other hand, since the reinforcing member 142 shown by hatching is not provided in the first chamber 138, it does not break because it does not directly receive the internal pressure of the first chamber 138 in an emergency.

  Here, the emergency is assumed to be a side collision, rollover, oblique collision, small overlap collision, and the like. Further, the predetermined value of the internal pressure of the first chamber 138 is a pressure value in a state where the first chamber 138 is completely filled with gas in an emergency. The internal pressure of the first chamber 138 may exceed a predetermined value when the occupant contacts the first chamber 138 in an emergency.

  In the cushion 104 shown in FIG. 4A, since the internal pressure of the first chamber 138 does not exceed the predetermined value, the detachable portion 140 is not broken. Therefore, in the first chamber 138, the dimension La in the vertical direction is maintained.

  However, when the occupant contacts the first chamber 138 in an emergency and the internal pressure exceeds a predetermined value, as shown in FIG. 4B, in the cushion 104, the detachable portion 140 is broken and the inboard base cloth 130 Bonding with the vehicle outside base fabric 132 is released. As a result, the dimension in the vertical direction of the first chamber 138 is increased by the dimension 2 × Wa of the width of the upper and lower detachable portions 140 with respect to the dimension La before the detachable portion 140 breaks, and becomes the dimension Lb. .

  As described above, in the cushion 104, when the internal pressure of the first chamber 138 exceeds a predetermined value, the detachable portion 140 is broken, and the dimension in the vertical direction of the first chamber 138 is increased, so the volume of the first chamber 138 is increased. , The internal pressure of the first chamber 138 can be reduced.

  Therefore, in the curtain airbag device 100, when the occupant contacts the first chamber 138 in an emergency and the internal pressure exceeds a predetermined value, the internal pressure of the first chamber 138 can be reduced to reduce the injury value to the occupant. Further, the predetermined value of the internal pressure of the first chamber 138 can be adjusted by changing the dimension Wa of the width of the detachable portion 140.

  Furthermore, in the curtain airbag device 100, since the reinforcing portion 142 is not broken, the side of the sewing portion 134 not facing the first chamber 134 can be reinforced by the reinforcing portion 142, and the airtightness can be further improved. Further, as shown in FIG. 4B, since the detachable portion 140 is adhered to the in-vehicle base fabric 130 in a broken state, the in-vehicle base fabric 130 can be reinforced. Although not shown, the detachable portion 140 may be adhered to the vehicle-side base fabric 132 in a broken state, and in this case, the vehicle-side base fabric 132 can be reinforced.

  FIG. 5 is a view illustrating a modified example of the coupling portion 136 of FIG. 4 (b). The joint portion 136A shown in FIG. 5A is not adhered to any of the inboard base cloth 130 and the outboard base cloth 132 in a state where the detachable part 144 is broken. Therefore, in the joint portion 136A, the desorption portion 144 reliably releases the joint between the inboard base cloth 130 and the outboard base cloth 132, so that the volume of the first chamber 138 is reliably increased in an emergency, and the internal pressure is reliably Can be reduced to

  The joint portion 136B shown in FIG. 5 (b) includes a first portion 148a bonded to the inboard base cloth 130 and a second portion 148b bonded to the outboard base cloth 132 in a state where the detachable portion 146 is broken. It is separated. As described above, the vehicle-side base fabric 130 can be reinforced with the first portion 148 a to separate the first portion 148 a and the second portion 148 b in the state where the detachable portion 146 is broken at the joint portion 136 B. Can be reinforced at the second portion 148b.

Second Embodiment
FIG. 6 is a schematic view illustrating a curtain airbag device 100A according to a second embodiment of the present invention. FIGS. 6A and 6B respectively show the case where the internal pressure of the first chamber 138A of the cushion 104A does not exceed the predetermined value and the case where the internal pressure exceeds the predetermined value. FIG. 7 is a view illustrating a cross section of the cushion 104A of FIG. 7 (a) and 7 (b) show a cross section taken along the line C-C in FIG. 6 (a) and a cross section taken along the line D-D in FIG. 6 (b).

  The curtain airbag device 100A differs from the curtain airbag device 100 in that it has an island-shaped detachable portion 150 at a position away from the sewing portion 134 in the first chamber 138A. The detachable portion 150 is formed of a heat-welded cloth using the same material as the above-described detachable portions 140, 144, and 146.

  In the cushion 104A shown in FIG. 6A, since the internal pressure of the first chamber 138A does not exceed the predetermined value, the detachable portion 150 is not broken. The non-ruptured desorption portion 150 forms a non-inflatable region in the first chamber 138A. Therefore, as shown in FIG. 7A, the first chamber 138A is divided into the upper chamber 152a and the lower chamber 152b with the desorbing portion 150 as a boundary, and the desorbing portion 150 further forms a non-inflatable region. Can be reduced. As shown in the drawing, the dimension in the vertical direction of the first chamber 138A is the dimension Lb, and the dimension in the vertical direction of the detachable portion 150 is the dimension Wb.

  However, when the occupant contacts the first chamber 138A in an emergency and the internal pressure exceeds the predetermined value, as shown in FIGS. 6 (b) and 7 (b), in the cushion 104A, the detachable portion 150 is broken. The bond between the inboard base fabric 130 and the outboard base fabric 132 is released. As a result, in the first chamber 138A, the non-inflated region formed by the desorption unit 150 disappears, and the upper chamber 152a and the lower chamber 152b are continuous. For this reason, the volume of the first chamber 138A shown in FIG. 7 (b) increases compared to that before breakage of the detachable portion 150 shown in FIG. 7 (a) even when the dimension in the vertical direction does not change. Because of this, the internal pressure drops.

  Therefore, in the curtain airbag device 100A, when the occupant contacts the first chamber 138A in an emergency and the internal pressure exceeds a predetermined value, the internal pressure of the first chamber 138A can be reduced to reduce the injury value to the occupant. Further, the predetermined value of the internal pressure of the first chamber 138A can be adjusted by changing the number and size of the island-like desorption portions 150. Further, since the detachable portion 150 is adhered to the inboard base cloth 130 in a broken state as shown in FIG. 7B, the inboard base cloth 130 can be reinforced.

  The island-like detachable portion 150 may be provided in the first chamber 138 of the cushion 104 of the curtain airbag device 100. In this way, the predetermined value of the internal pressure can be adjusted more finely, for example, by further reducing the volume of the first chamber 138.

Third Embodiment
FIG. 8 is a schematic view illustrating a curtain airbag device 100B according to a third embodiment of the present invention.

  The cushion 104B of the curtain airbag device 100B includes a sewing unit 154 and a coupling unit 156. The sewing unit 154 sews the inboard base fabric 130 and the outboard base fabric 132 to form a first chamber 158 and a second chamber 160 in which contact with the occupant is assumed in an emergency, and further, the gas inlet port 162 is Form. The gas inlet 162 is a passage for introducing a gas from the first chamber 158 to the second chamber 160 in an emergency, and expanding and deploying the second chamber 160 later than the first chamber 158.

  The joint portion 156 is formed of a heat-welded cloth using the same material as the joint portions 136, 136A, 136B described above, and partially joins the inboard base cloth 130 and the outboard base cloth 132. The connecting portion 156 also includes a closing portion 164 and reinforcing portions 166a and 166b.

  The closing portion 164 is provided in the gas inlet port 162 and blocks the gas inlet port 162. However, the closing part 164 is broken when the internal pressure of the first chamber 158 exceeds a predetermined value in an emergency, and the gas inlet 162 is opened (see FIG. 9). Note that FIG. 8 shows the case where the internal pressure of the first chamber 158 does not exceed the predetermined value, and the closing portion 164 is not broken.

  The reinforcing portions 166 a and 166 b are located on the opposite side of the gas inlet port 162 along the sewing portion 154, that is, on the side not facing the gas inlet port 162. And the reinforcement parts 166a and 166b reinforce the side which does not face the gas inlet port 162, and are further improving airtightness.

  FIG. 9 is a diagram illustrating the curtain airbag device 100B when the internal pressure of the first chamber 158 in the cushion 104B of FIG. 8 exceeds a predetermined value.

  In the cushion 104B, since the gas introduction port 162 is closed by the closing portion 164, the gas is first introduced into the first chamber 158, and the internal pressure of the first chamber 158 becomes a predetermined value. Next, in the cushion 104B, when the occupant comes in contact with the first chamber 158 in an emergency and the internal pressure exceeds a predetermined value, the closing portion 164 breaks and opens the gas inlet port 162. As a result, in the cushion 104B, a gas is introduced from the first chamber 158 to the second chamber 160 via the gas inlet 162 (see arrow E), and the internal pressure of the first chamber 158 decreases.

  Therefore, according to the curtain airbag device 100B, when the occupant contacts the first chamber 158 in an emergency and the internal pressure exceeds a predetermined value, the internal pressure of the first chamber 158 can be reduced to reduce the injury value to the occupant. Furthermore, since the second chamber 160 can expand and deploy with a delay more reliably than the first chamber 158, it can function as a so-called delay chamber.

  Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the appended claims, and of course these also fall within the technical scope of the present invention. It is understood.

  Although the curtain airbag according to the present invention is applied to a car in the above embodiment, the present invention can also be applied to an aircraft or a ship other than a car, and the same effects can be obtained. it can.

  INDUSTRIAL APPLICABILITY The present invention can be used for a curtain airbag device provided with a cushion that inflates and deploys along the upper side of a vehicle interior for the purpose of protecting an occupant at the time of a side collision or rollover (lateral rollover) of the vehicle.

100, 100A, 100B: curtain airbag device, 102: inflator, 104, 104A, 104B: cushion, 106: vehicle, 108: front seat, 110: rear seat, 112, 114: side window, 116: front pillar , 118: center pillar, 120: rear pillar, 122: roof side rail, 124: cover, 126: tab, 128: strap, 130: inner base cloth, 132: outer base cloth, 134: sewing part, 136, 136A , 136B, 156 ... coupling portion, 138, 138A, 158 ... first chamber, 140, 144, 146, 150 ... desorption portion, 142, 166a, 166b ... reinforcement portion 148a ... first portion of desorption portion, 148b ... desorption Second part of the unit, 152a ... upper chamber, 152b ... lower chamber, 1 0 ... second chamber, 162 ... gas inlet, 164 ... closure

Claims (8)

It is a curtain airbag apparatus provided with the bag-like cushion which inflate-deploys along a vehicle body side wall in a vehicle interior using gas, Comprising: The said cushion is
Inner side cloth and outer side cloth,
A sewing unit that sews the inboard base fabric and the outboard base fabric and defines a first chamber in which contact with an occupant is expected in an emergency;
And a bonding portion for partially bonding the inboard base fabric and the outboard base fabric,
The coupling portion includes a desorption portion provided in the first chamber to reduce the volume of the first chamber,
The curtain airbag apparatus according to claim 1, wherein the detachable portion breaks when the internal pressure of the first chamber exceeds a predetermined value in an emergency, and decreases the internal pressure by increasing the volume of the first chamber. The detachable portion is located on the first chamber side of the sewn portion along the sewn portion,
The curtain airbag according to claim 1, wherein the connecting portion further includes a reinforcing portion positioned on the opposite side of the detachable portion along the sewn portion and integrated in a band shape with the detachable portion. apparatus.   The curtain airbag device according to claim 1, wherein the detachable portion is provided in an island shape at a position separated from the sewing portion in the first chamber. It is a curtain airbag apparatus provided with the bag-like cushion which inflate-deploys along a vehicle body side wall in a vehicle interior using gas, Comprising: The said cushion is
Inner side cloth and outer side cloth,
Sewing the inboard base fabric and the outboard base fabric, and introducing a first chamber and a second chamber in which contact with an occupant is assumed in an emergency, and introducing a gas from the first chamber to the second chamber in an emergency A sewing portion forming a gas inlet for expanding and developing the second chamber later than the first chamber;
And a bonding portion for partially bonding the inboard base fabric and the outboard base fabric,
The connecting portion includes a closing portion provided in the gas inlet and closing the gas inlet,
The curtain airbag apparatus according to claim 1, wherein the closing portion is broken when the internal pressure of the first chamber exceeds a predetermined value in an emergency, and the internal pressure of the first chamber is decreased by opening the gas inlet.   The joint portion is formed of a heat-welding cloth which is overlapped between the in-vehicle base fabric and the in-vehicle outer base fabric and bonded to the in-vehicle base fabric and the outer-vehicle base fabric by heating. The curtain airbag apparatus of any one of Claim 1 to 4 characterized by the above-mentioned. The heat-welding cloth is formed of a ductile cloth material containing a plurality of polymer fibers,
The curtain airbag device according to claim 5, wherein at least a part of the polymer fiber comprises a polymer resin fiber which is fused to each other.   7. The curtain airbag device according to claim 5, wherein the heat-welded fabric is bonded to either the in-vehicle base fabric or the out-vehicle base fabric in a broken state.   The thermal bonding cloth is separated in a broken state into a first portion bonded to the vehicle-side base fabric and a second portion bonded to the vehicle-side base fabric. Curtain airbag device according to claim 1.

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