JP6277077B2 - Curtain airbag device and method for folding curtain airbag - Google Patents

Description

  The present invention relates to a curtain airbag device including a curtain airbag that inflates and deploys along a side window portion of a vehicle at the time of a vehicle collision, and a method for folding the curtain airbag.

2. Description of the Related Art In recent years, a curtain airbag device has been mounted on a vehicle in order to protect an occupant's head in the event of a vehicle collision or rollover.
The curtain airbag of the curtain airbag device is folded into an elongated shape and stored along the roof side portion of the vehicle, and is inflated and deployed along the vertical wall portion of the vehicle by the gas supplied from the inflator.

  Japanese Patent Application Laid-Open No. 2011-111075 (Patent Document 1) discloses a main inflating portion, a sub inflating portion partitioned from the main inflating portion by a dividing line, and a communication portion that communicates between the main inflating portion and the sub inflating portion. The main inflatable portion is rapidly deployed by effectively using the inflating gas, and when the occupant comes into contact with the main inflating portion, the gas moves from the main inflating portion to the sub inflating portion via the communicating portion. The curtain airbag which can suppress the force added to a passenger | crew is disclosed.

  Briefly, the curtain airbag described in Patent Document 1 includes a gas guide portion that communicates with the gas introduction portion, a first main inflatable portion that communicates with the front side of the gas guide portion, and a rear of the gas guide portion. A second main expansion part communicating with the first side, a first sub-expansion part arranged on the front side of the first main expansion part, and a second sub-expansion arranged on the rear side of the first main expansion part And a third sub-expansion part arranged on the front side of the second main expansion part.

  In addition, the first main expansion portion and the first and second sub-expansion portions are partitioned by a dividing line, and the first and second sub-expansion portions are interposed via the first and second vent holes. It communicates with the first main expansion part. The second main inflating part and the third sub inflating part are partitioned by a dividing line, and the third sub inflating part communicates with the second main inflating part through the third vent hole.

  The curtain airbag of Patent Document 1 has a horizontal position spaced upward by a predetermined dimension from the lower edge of the airbag and a position along the upper side of the first vent hole and the second vent hole. It is sandwiched between a pair of rod-like members (jigs) called folding sabers, rotated in one direction, and wound around an air bag around the rod-like member to form a roll. It is folded. In this case, the airbag is folded in a state of being folded by a fold line formed along a portion pressed by the rod-shaped member.

  In such a curtain airbag of Patent Document 1, the gas generated by the inflator is introduced into the first and second main inflating parts via the gas introducing part and the gas guiding part at the time of a vehicle collision, and is inflated and deployed. Since the first and second vent holes are closed by the fold line until the airbag expands and reaches the fold line that has been held down by the rod-shaped member, the gas is effectively used. In addition, the first and second main expansion portions can be rapidly deployed.

  After that, when the airbag is inflated and deployed to the fold line, the airbag is quickly deployed so as to open at the fold line, and the first and second vent holes can be opened. Accordingly, when the occupant comes into contact with the first main inflating portion of the curtain airbag inflated and deployed in such a state, the gas moves to the first and second sub-inflating portions through the first and second vent holes. Therefore, it is possible to suppress the force received by the occupant from the curtain airbag.

JP 2011-111075 A

  The curtain airbag is inflated and deployed downward from the roof side portion by supplying the gas generated by the inflator as described above when the vehicle receives an impact due to a collision or the like. When the occupant comes into contact with the deployed curtain airbag, the occupant can be received and protected by the curtain airbag. Also, when receiving the occupant with the curtain airbag, for example, even if the side window portion of the vehicle is open at the time of a collision, the curtain airbag that has been inflated and deployed is prevented from jumping out of the side window portion of the vehicle. It is required to protect passengers stably with curtain airbags.

  Conventionally, in order to prevent a curtain airbag that is inflated and deployed from jumping out of the side window of the vehicle, the curtain air bag is connected to the pillar on the front side of the curtain airbag by a tether belt (strap) or the like. By regulating the behavior of the bag, and adjusting the shape and storage position of the curtain airbag, the shape and size of the side window, the position of the pillar, etc., the inflated and deployed curtain airbag is applied to the window frame. Means such as contact are taken.

  The design restrictions associated with the adjustment of the vehicle body shape and the positional relationship with the curtain airbag device are alleviated, and the increase in cost due to the regulation by the tether belt is suppressed, making it easier for passengers to There is a need for a curtain airbag device that can achieve protective performance.

  The present invention has been made in view of the above-described conventional problems, and is provided with a curtain air having a curtain airbag capable of increasing the degree of freedom of design on the side of the mounted vehicle body and restricting the deployment posture with a simpler structure. A bag device and a method for folding a curtain airbag are provided.

  In order to achieve the above object, a curtain airbag device according to the present invention is stored in a roof side portion of a vehicle in a folded state, and is inflated along a window portion of the vehicle by supplying inflation gas. A curtain airbag that deploys, and the curtain airbag extends downward from a lower end portion of the main inflation portion corresponding to the window portion at the time of inflation and deployment, and the vehicle interior below the window portion; The curtain airbag has a first inflated portion of the main inflating portion centered on a first fold located at a lower end portion of the main inflating portion. A fold part, a second fold part in which the first fold part is folded around a second fold parallel to the first fold in the first fold part, and the second fold part. And wrap around the outside of the second fold The main expanding portion above the first folding portion is characterized by comprising folded to form a roll wound in the roll.

In the curtain airbag device according to the present invention, the second fold is not less than ¼ and not more than ３ of the height of the first fold when the curtain airbag is deployed from the first fold. The position is preferred.
Moreover, the upper part of the said main expansion part is good to make it the bellows fold part which wraps the said roll body repeatedly over both sides from upper direction.

  The curtain airbag according to the present invention has a main inflating portion corresponding to a window portion of a vehicle at the time of inflating and deploying downward from a lower end portion of the main inflating portion, and a position corresponding to a vehicle interior below the window portion. A step of forming a first fold portion by folding the sub expansion portion around the main expansion portion around a first fold located at a lower end portion of the main expansion portion; Forming a second fold by folding the first fold around the second fold parallel to the first fold in the first fold; and centering on the second fold The main foldable portion above the first foldable portion is wrapped in a roll shape so as to wrap the outside of the second foldable portion, and is folded by a folding method.

  According to the curtain airbag device of the present invention, first, gas is introduced into the main inflating portion of the curtain airbag and the main inflating portion is inflated and deployed, whereby the roll body of the roll-folded main inflating portion is deployed downward. . When the first and second folds are unraveled, the main expansion portion pushes the sub-expansion portion into which the gas flows into the vehicle interior side, and the sub-expansion portion contacts the vehicle interior wall surface below the window portion. Supported.

  As a result, the curtain airbag can be kept in a predetermined state by regulating the deployment posture in the vehicle interior without requiring strict posture control by a tether belt or the like, so that the occupant can be restrained stably. In addition, the production cost of the curtain airbag device can be reduced.

It is the side view which looked at the curtain airbag which concerns on this invention from the vehicle outer side. (A) is a side view which shows the state by which the sub-inflation part in the curtain airbag was folded and the 1st folding part was formed, (b) is the cross section in the bb line shown to (a). FIG. (A) is a side view which shows the state by which the lower half part of the 1st folding part in the curtain airbag was folded and the 2nd folding part was formed, (b) was shown to (a) It is sectional drawing in the bb line. (A) is a side view which shows the state by which the main expansion part in the curtain airbag was rolled up from the lower end part of a 2nd folding part, and the roll body was formed, (b) is (a). It is sectional drawing in the bb line shown in FIG. (A) is a side view which shows the state in which the upper part of the roll body in the curtain airbag was folded and the 1st arm part extended to a vehicle outer side was formed, (b) is b shown to (a). It is sectional drawing in the -b line. (A) is a side view which shows the state in which the 2nd arm part extended in the vehicle interior side by folding the upper part of the 1st arm part in the curtain airbag was formed, (b) is (a). It is sectional drawing in the shown bb line. It is explanatory drawing which illustrates a mode that the curtain airbag is inflate-deployed typically in the cross section orthogonal to a vehicle length direction.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
In the following description, the vertical direction is the vehicle height direction, the upper direction is the direction on the roof (ceiling) side of the vehicle, and the lower direction is the direction on the ground side. The front-rear direction is the vehicle length direction of the vehicle, the front is the direction of the vehicle traveling side, and the rear is the direction of the vehicle reverse side. The left-right direction is the vehicle width direction of the vehicle, and refers to the left-right direction when the driver is seated in the driver's seat and looks forward. Further, the vehicle width direction may be expressed as the vehicle outer side or the vehicle interior side with respect to the curtain airbag.

  As shown in FIG. 1, a curtain airbag device including a curtain airbag 10 according to the present embodiment is accommodated in a roof side portion 4 of an automobile that is a vehicle. In addition to the curtain airbag 10, the curtain airbag device includes an inflator (not shown) that generates inflation gas, a gas introduction pipe (not shown) that connects the inflator to the curtain airbag 10, and a curtain An attachment such as a bracket for attaching the airbag 10 to the roof side portion 4, a cover body that accommodates the folded airbag and holds the folded shape, and the like are provided.

  In the present invention, the installation position of the inflator and the gas introduction pipe with respect to the vehicle body 1 can be arbitrarily changed. For example, the inflator is installed inside the airbag main body 11 described later of the curtain airbag 10 without providing the gas introduction pipe. It is also possible to provide it.

  The vehicle body 1 includes seats such as a front row seat that can be seated by an occupant and a second row seat that is a rear seat, and can be opened to the left and right sides of these seats. First and second unillustrated first and second windows disposed below the first and second side window portions (first and second side windows) 2a and 2b and the first and second side window portions 2a and 2b, respectively. A door portion having a door trim is provided.

  In addition, on both sides of the passenger compartment, in order from the front side, an A pillar 3a (also referred to as a front pillar in the present embodiment) serving as a first window pillar, and a B pillar 3b serving as a second window pillar ( In this embodiment, it is also called a center pillar), and a C pillar 3c (also called a rear pillar in this embodiment) serving as a third window column is disposed.

  Further, the curtain airbag device is accommodated between the upper ends of these A pillars 3a to C pillars 3c and the upper ends of the first and second side windows 2a and 2b and the ceiling panel forming the ceiling. A roof side portion 4 is arranged.

  In the present invention, the form of the vehicle body, the number and shape of the side window portions arranged on the vehicle body, the shape and structure of the door portion, the number of pillars, etc. are not particularly limited and can be arbitrarily changed. For example, it is possible to provide four pillars of A pillar to D pillar on both sides of the passenger compartment. In that case, the C pillar as well as the B pillar is called the center pillar, and the D pillar located at the rearmost side is called the rear pillar.

  The curtain airbag 10 of the present embodiment is accommodated in the roof side part 4 in a folded state according to a predetermined procedure to be described later, and gas generated by an inflator at the time of automobile collision or rollover. Is supplied to the interior of the curtain airbag 10 through the gas introduction pipe, and then protrudes downward from the roof side portion 4 to the heads of the passengers seated in the first and second row seats. In order to protect it, it is arranged so that it can be deployed in a substantially planar manner to the side of the passenger.

  The curtain airbag 10 has a gas inlet formed at a central portion of an airbag main body 11 formed in a bag shape long in the front-rear direction and an upper edge that is one edge of the airbag main body 11. Part 12, a plurality of attachment pieces 13 formed on the upper edge of the airbag body 11, and a tether belt (tension strap) 14 attached to the front end of the airbag body 11 and connected to the A pillar 3 a. And have.

  Further, the gas introduction part 12 of the curtain airbag 10 is extended so as to protrude upward from the upper end part of the airbag body part 11, and a gas introduction pipe is inserted into the gas introduction part 12. Thereby, the gas generated in the inflator is introduced into the airbag main body 11 from the gas introduction part 12 through the gas introduction pipe. Note that the curtain airbag 10 of the present invention can also include components other than the components described above.

  The airbag main body 11 is formed in a bag shape by joining a peripheral portion at a position excluding the gas introduction part 12 by sewing or the like on one or more base fabrics. The airbag body 11 includes a plurality of restricting portions 15 that control the flow of gas introduced into the airbag body 11 during inflation and deployment, and restrict the size of the airbag body 11 inflating in the vehicle width direction. Is provided.

  Each restricting portion 15 is formed by a stitched portion that stitches together a first base fabric that constitutes a surface of the airbag body 11 on the vehicle interior side and a second base fabric that constitutes a surface outside the vehicle. In addition, a circle portion 15 a in which the first and second base fabrics are sewn in a circular shape is formed at the end of the restricting portion 15. By providing such a circle portion 15a, it is possible to ensure the elongation of the base fabric during inflation and deployment and prevent wrinkles, and to concentrate stress on the end of the restriction portion 15 when the airbag body 11 is inflated and deployed. Sufficient strength can be obtained.

  In the present embodiment, the first and second base fabrics of the curtain airbag 10 are all joined by sewing. However, for example, welding and adhesion using an adhesive may be used. The joining method can be appropriately selected depending on the material of the curtain airbag 10.

  Furthermore, the curtain airbag 10 of this embodiment is formed using fiber yarns, such as a polyester fiber, a polyamide fiber, an aramid fiber, an aromatic polyester fiber, a vinylon fiber, an acrylic fiber, for example. Furthermore, carbon fiber, glass fiber, metal fiber, etc. can be mixed and reinforced.

  Further, the airbag main body 11 of the present embodiment has a hollow portion (air chamber) including a portion corresponding to the arrangement height region of the first and second side window portions 2a and 2b of the vehicle when the airbag body is inflated and deployed. The main inflating portion 11a provided and the first door trim that extends downward from the front end in the vehicle length direction at the lower end of the main inflating portion 11a and is arranged below the front first side window portion 2a. And a sub-inflatable portion 11b that can abut at the time of deployment.

  In this case, the inside (hollow part) of the main expansion part 11a and the inside (hollow part) of the sub expansion part 11b communicate with each other, and the gas introduced from the gas introduction part 12 is transferred from the main expansion part 11a to the sub expansion part. It is formed to smoothly circulate to 11b. Further, the sub inflating portion 11b is arranged in a range between the A pillar 3a and the B pillar 3b of the vehicle body 1 in the vehicle length direction in the development view of the curtain airbag 10, and the lower end of the main inflating portion 11a. It extends downward from the part with a size of 5 cm or more.

Next, a method for folding the airbag main body 11 in the curtain airbag 10 of the above-described embodiment will be described with reference to FIGS.
3 (b), 4 (b), 5 (b), and 6 (b), in order to make the cross-sectional shape of the curtain airbag 10 easy to understand, it is between the first and second base fabrics. The cross section and the folded state are schematically illustrated with a slight gap therebetween. However, such an interval does not exist when the actual curtain airbag 10 is folded, and the curtain airbag 10 is folded with no air gap between the first and second base fabrics. In addition, the first and second folding parts 21, 22 and the roll body 23, which will be described later, are actually formed more compactly.

  First, the air bag main body 11 of the curtain air bag 10 has a main inflating portion along the lower end portion of the main inflating portion 11a from the state in which the first and second base fabrics are flattened as shown in FIG. 11a and the sub-expansion part 11b as a first fold 20a, and the lower sub-expansion part 11b is located on the vehicle interior side so as to overlap the main expansion part 11a around the first fold 20a as shown in FIG. Wrap around. Thereby, the 1st folding part 21 with which a part by the side of the lower end part of the main expansion part 11a and the folded back sub expansion part 11b were piled up is formed.

  Subsequently, the lower half of the formed first fold portion 21 is centered on the second fold 20b as shown in FIG. 2 formed in parallel with the first fold 20a in the first fold portion 21. Then, it is folded back to the vehicle outer side so as to overlap the upper half of the first folding part 21. Thereby, as shown in FIG. 3, the 2nd folding part 22 with which the lower half part and upper half part of the 1st folding part 21 were piled up is formed.

  At this time, in the second fold 20b, in the state of the curtain airbag 10 shown in FIG. 3, the height dimension (dimension in the vertical direction) H2 between the first fold 20a and the second fold 20b is as shown in FIG. It is set to a position that is not less than 1/4 and not more than 1/3 of the entire height dimension H1 of the illustrated first folding part 21.

  By setting the position of the second fold 20b in this way, the curtain airbag 10 can be folded in a compact manner, and when the curtain airbag 10 is inflated and deployed, the sub-inflation part 11b will be described later. The curtain airbag is made to stably deploy so as to jump out to the vehicle interior side, and the inflated sub-inflatable portion 11b is securely brought into contact with the inner wall surface of the first door trim below the first side window portion 2a of the vehicle. 10 can be supported and its deployed posture can be regulated.

  Next, as shown in FIG. 4, from the lower end part of the formed second folding part 22, the second folding part 22 is wrapped inside so that the main expansion part 11a is centered on the second folding part 22. Is rolled up to form a roll body 23 (sometimes referred to as a roll fold or a stack) in which the second fold 22 is wrapped in a substantially central portion in a sectional view.

  The roll body 23 is formed by, for example, sandwiching the second folding part 22 along the vehicle length direction with a pair of rod-like members (not shown), and further sandwiching the pair of rod-like members with the second folding part 22. This is performed by rotating the upper body 11 integrally with the main body 11 and winding the main inflatable portion 11a of the airbag body 11 around the rod-shaped member. At this time, it is preferable that the main inflating part 11a of the airbag main body 11 is wound up to a position of 50% or more and 80% or less from the lower end of the main inflating part 11a with respect to the height dimension of the main inflating part 11a.

  In particular, in this embodiment, the roll body 23 folded into an outer roll shape is formed by winding the main inflating portion 11a of the airbag main body 11 to the vehicle outer surface side of the main inflating portion 11a. By forming such a roll body 23, when the gas is introduced into the main inflatable portion 11 a of the airbag main body 11 and the main inflatable portion 11 a is inflated and deployed, the roll body 23 is moved to the first and The second side window portions 2a and 2b and the A pillars 3a to C pillars 3c are inflated and deployed downward, and further, the airbag main body portion 11 is provided with the first and second side window portions 2a and 2b. In addition, it is possible to inflate and deploy so as to be directed (pressed) toward the A pillar 3a to the C pillar 3c. In addition, this invention is not limited to this, The main body part 11a of the airbag main-body part 11 is rolled up to the vehicle inner surface side of the main body part 11a, and a roll body may be folded and formed in the shape of an inner roll. Is possible.

  After the roll body 23 is formed as described above, the upper portion of the airbag body 11 above the roll body 23 is repeated over the roll body 23 from the upper side to both the vehicle outer side and the vehicle inner side parasol. The bellows fold part 24 is formed by folding so that it may be wrapped in.

  For example, in the present embodiment, first, as shown in FIG. 5, after the lower half of the upper portion of the airbag main body 11 is placed on the outer side of the roll body 23, By folding back at the crease portion (third crease portion), the first arm portion 24 a that is the vehicle exterior side of the bellows fold portion 24 is formed.

  Then, as shown in FIG. 6, after covering the upper half part of the said upper part on the vehicle interior side of the roll body 23, it is one fold part (4th crease | fold part) distribute | arranged to the vehicle interior side. By folding back, the second arm portion 24b which is the vehicle interior side of the bellows fold portion 24 is formed. By using such a folding method (so-called rollover folding), the bellows fold portion 24 that wraps the roll body 23 from above with the first and second arm portions 24a and 24b is formed.

  In the present invention, the structure of the bellows fold portion is not limited to this. For example, the first arm portion that is folded first is formed on the vehicle exterior side of the parasol portion, and the second arm portion that is folded later is located on the vehicle interior side of the parasol portion. It is also possible to form. For example, as shown in FIG. 5 of Patent Document 1 described above, a ventilation position communicating with the front and rear of the airbag main body is set in the upper portion above the roll body of the airbag main body, The first arm portion on the vehicle outer side and the vehicle on the vehicle outer side are separately flattened and extended into an arm shape so as to communicate with the ventilation position from the inside. A bellows fold portion including the second arm portion on the indoor side can also be formed. Furthermore, it is also possible to fold the airbag body by adding another folding method to the above folding method.

  By performing the folding process as described above in order, the airbag main body 11 is obtained by being folded into an elongated and substantially cylindrical shape with the front-rear direction as the longitudinal direction with the plurality of attachment pieces 13 protruding outward. It is done.

  Thereafter, the folded airbag body is held by covering the folded airbag body 10 of the curtain airbag 10 with a cylindrical cover body or winding a tape. Furthermore, the curtain airbag device of the present embodiment is manufactured by attaching a mounting bracket to the mounting piece portion 13 of the curtain airbag 10 or connecting a gas introduction pipe or inflator to the gas introduction portion 12 of the curtain airbag 10. Is done.

  The manufactured curtain airbag device of the present embodiment is attached to the roof side portion 4 from the vehicle interior side of the vehicle body 1. Note that the operation of attaching the curtain airbag device to the vehicle body 1 can be performed by a method similar to the conventional method.

  Next, the behavior (operation) of the airbag main body 11 when the curtain airbag 10 of the curtain airbag device attached to the vehicle body 1 is inflated and deployed will be described with reference to FIG.

  First, when a collision or rollover of the vehicle occurs and the control device detects an impact, the control device activates an inflator to generate gas, and the generated gas passes through the gas introduction pipe to the curtain airbag 10. The gas is introduced from the gas introduction part 12 into the airbag main body part 11.

  When gas is introduced into the gas introduction part 12 of the curtain airbag 10, the airbag main body part 11 starts to inflate and deploy, and for example, the head lining or pillar garnish of the vehicle is deformed so as to be pushed out from the inside. 11 forms the opening which can protrude. The airbag main body 11 is inflated and deployed so as to jump out of the formed opening into the vehicle interior.

  In the inflation and deployment behavior of the airbag body 11 in the curtain airbag 10, first, gas flows through the bellows fold 24 of the airbag body 11, and the bellows fold 24 is inflated and deployed. At this time, the first and second arm portions 24a and 24b of the bellows fold portion 24 expand on the vehicle outer side and the vehicle interior side, respectively, with the roll body 23 as a reference in the vehicle width direction. And the second arm portions 24a and 24b are deployed so that the roll body 23 is directed downward, particularly along the first and second side window portions 2a and 2b of the vehicle body 1 and the A pillars 3a to C pillars 3c. And extrude.

Subsequently, when the gas flows to the roll body 23 of the airbag main body 11, the roll body 23 expands and expands downward while rolling so as to unwind.
In this case, the roll body 23 of the present embodiment is formed as the roll body 23 wound up in an outer roll shape on the vehicle outer surface side of the main expansion portion 11a as described above. Therefore, as shown in FIG. 7A, when the roll body 23 is deployed, the roll body 23 is moved to the first and second side window portions 2a, 2b of the vehicle body 1 and the A pillars 3a to C pillars. The airbag main body 11 can be smoothly inflated and deployed downward by causing the A pillar 3a to the C pillar 3c to slidably contact with each other while being directed (pressed) to 3c.

  Next, when the roll body 23 is unfolded and the second folding part 22 of the airbag body 11 appears from the roll body 23, gas flows into the sub-inflation part 11 b of the airbag body 11, The inflating part 11b is inflated and deployed.

  At this time, as shown in FIG. 7 (b), the second fold 20b and the first fold 20a of the airbag main body 11 are instantaneously opened, and the second fold 22 is folded to the outside of the vehicle. The state is canceled, and the folded state of the first folding unit 21 is canceled. As a result, a force that pushes the inflating sub-inflatable portion 11b to the vehicle interior side along with the inflating pressure is given by the cancellation of the folding, and the inflating and deploying direction on the lower end side of the airbag main body portion 11 is set to the lower side. , Can be directed (changed) slightly toward the vehicle interior side.

  Accordingly, as shown in FIG. 7 (c), the main inflating portion 11a and the sub inflating portion 11b of the airbag body 11 are appropriately inflated, and the inflated sub inflating portion 11b is used as the first in the vehicle. And even if the 2nd side window parts 2a and 2b are open, it can be made to contact | abut reliably to the inner wall face of the 1st door trim below the 1st side window part 2a of a vehicle.

  Thus, in the curtain airbag 10 according to the present embodiment, the curtain airbag 10 is provided with the sub-inflation portion 11b and folded as described above, so that the airbag main body portion 11 is located below the window portion. The curtain airbag 10 can be supported in contact with the wall surface. Therefore, the deployment posture of the airbag main body 11 is stably regulated on the vehicle interior side and kept in a predetermined state, and the occupant can be stably protected by the curtain airbag 10.

  In the above-described embodiment, the auxiliary inflating portion 11b of the airbag main body 11 is a front end in the vehicle length direction at the lower end of the main inflating portion 11a of the airbag main body 11 in the development view of the airbag main body 11. It extends downward only from the part. However, the form of the curtain airbag of the present invention is not limited to this.

  For example, the sub-inflation part of the airbag body part is the rear end part in the vehicle length direction (the B-pillar of the vehicle body in the vehicle length direction) at the lower end part of the main inflation part of the airbag body part. It may be extended downward only from the range between the C pillar, or may be extended downward from both the front end portion and the rear end portion in the vehicle length direction. Furthermore, the sub-expansion part may be extended downward from a plurality of portions at the lower end part of the main expansion part.

  Furthermore, the sub-inflation part of the airbag main body part may extend downward from the entire lower end part (entire range) of the main inflation part in the development view of the curtain airbag. In this case, the position of the first fold parallel to the vehicle length direction formed when the airbag main body is folded is the boundary between the main inflating portion and the sub inflating portion.

1 Car body 2a First side window (first side window)
2b Second side window (first side window)
3a A pillar 3b B pillar 3c C pillar 4 Roof side part 10 Curtain airbag 11 Airbag body part 11a Main inflating part 11b Secondary inflating part 12 Gas introducing part 13 Mounting piece part 14 Tether belt (tension strap)
DESCRIPTION OF SYMBOLS 15 Restriction part 15a Circle part 20a 1st fold 20b 2nd fold 21 1st fold part 22 2nd fold part 23 Roll body 24 Bellows fold part 24a 1st arm part 24b 2nd arm part H1 Whole 1st fold part Height dimension H2 Height dimension between the first and second folds

Claims (4)

A curtain airbag that is stored in the roof side portion of the vehicle in a folded state and is inflated and deployed along the window portion of the vehicle by being supplied with inflation gas,
The curtain airbag has a main inflating portion corresponding to the window portion and a sub-inflation that extends downward from the lower end portion of the main inflating portion and inflates to a position corresponding to the vehicle interior below the window portion when inflated and deployed. And
The curtain airbag includes a first fold portion in which the sub-inflation portion is folded over the main inflation portion around a first fold located at a lower end portion of the main inflation portion, and the first fold portion in the first fold portion. A second fold portion in which the first fold portion is folded around a second fold parallel to the first fold, and the second fold portion so as to wrap the outside of the second fold portion around the second fold portion. The main inflatable part above the one fold part is folded to form a roll body wound in a roll shape,
A curtain airbag device characterized by that.   2. The curtain according to claim 1, wherein the second fold is a position not less than ¼ and not more than １ ／ of a height dimension of the first fold portion when the curtain airbag is deployed from the first fold. Airbag device.   3. The curtain airbag device according to claim 1, wherein an upper portion of the main inflating portion is a bellows fold portion that repeatedly wraps the roll body from above to both side portions. A curtain having a main inflating portion corresponding to a window portion of a vehicle at the time of inflating and expanding, and a sub-inflating portion extending downward from a lower end portion of the main inflating portion and inflating to a position corresponding to a vehicle interior below the window portion. A method of folding an airbag,
A step of folding the sub-expansion part on the main expansion part around the first fold located at the lower end of the main expansion part to form a first folding part;
Folding the first fold part around a second fold parallel to the first fold in the first fold part to form a second fold part;
Winding the main inflatable part above the first foldable part in a roll shape so as to wrap the outside of the second foldable part around the second foldable part, and forming a roll body;
A method for folding a curtain airbag, comprising:

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