JPWO2012008241A1 - Curtain airbag device for vehicle - Google Patents

Abstract

[PROBLEMS] It is possible to accurately secure occupant protection performance even when the occupant is in a non-regular position, and to appropriately incorporate an occupant protection function against a passenger's release from outside the vehicle and a side collision. Provided is a curtain airbag device for a vehicle that can satisfy all three occupant protection performances. An airbag body 2 includes main chambers 14 and 15 formed in an airbag space surrounded by an annular seam S. The main chamber is formed by an upper lateral guide seam portion 13a and a longitudinal guide seam portion 13b. Surrounded by a guide seam 13 formed in a letter shape and partitioned inside, a lateral gas duct 18 is formed above the upper lateral guide seam, and a longitudinal chamber 21 is formed between the longitudinal guide seams facing each other. Each main chamber is expanded and inflated downward and obliquely downward in the front and rear of the vehicle with a gas flow that flows from the horizontal gas duct and the vertical chamber and fills up. [Selection] Figure 1

Description

  The present invention is capable of accurately ensuring the occupant protection performance even when the occupant is in the non-regular position, and appropriately incorporating the occupant protection function against the occupant's release from the vehicle and the side collision, The present invention relates to a curtain air bag device for a vehicle that can satisfy all three occupant protection performances.

  Patent Document 1 is known as a curtain airbag device for a vehicle in which an airbag body is deployed and inflated downward along a side window from a roof. The “head protection airbag device” of Patent Document 1 has an object to provide a head protection airbag device capable of generating a high tension along the vehicle longitudinal direction on the lower edge side of the airbag when deployment and inflation are completed. When the inflation gas is flowed in and the airbag completes the deployment and inflation, a tension in the front-rear direction is generated in each of the inflating shielding portions by the inflating portions partitioned by the partitioning portions in each of the inflating shielding portions. The respective expansion shielding portions are connected to each other on the lower edge side of the airbag by an expansion communication portion at a position below the plate-like portion that does not allow the inflation gas to flow. The expansion communication portion is disposed in the front-rear direction along the lower edge of the airbag, and the expansion shield portions can be connected to each other without lowering the tension generated in the expansion shield portions. Overall, a high tension along the front-rear direction can be generated.

JP 2002-302005 A

  Patent Document 1 discloses that a high tension along the front-rear direction is generated on the entire lower edge of the airbag by an inflating communication portion that is a plate-like portion that does not allow the inflating gas to flow, so that an occupant particularly at the time of vehicle rollover It is designed to prevent the vehicle from being released.

  However, the overall performance of the airbag is not limited to the occupant protection performance by preventing the occupant from being released, but not only when the occupant is seated in a normal posture, but also when the occupant's head is close to the side window, It is necessary to secure occupant protection performance when the vehicle is in the out of position) and occupant protection performance against side collisions, and it is desired to devise a curtain airbag device for a vehicle that can satisfy all three protection performances. .

  The present invention was devised in view of the above-described conventional problems, and even when the occupant is in a non-regular position, the occupant protection performance can be ensured accurately, and the occupant's release prevention function and side surface It is an object of the present invention to provide a curtain airbag device for a vehicle that can appropriately incorporate an occupant protection function against a collision and can satisfy all three occupant protection performances.

  A curtain airbag device for a vehicle according to the present invention is a curtain airbag device for a vehicle having an airbag body that is deployed and inflated downward along a side window from a roof, and the airbag body uses an inflator gas. A gas introduction port to be introduced and a main chamber formed in an airbag space surrounded by the seam, wherein the main chamber is formed by connecting and bending at least the upper lateral guide seam portion and the vertical guide seam portion. Surrounded by a guide seam formed in the air bag space and partitioned inside, and above the upper lateral guide seam portion, the inflator gas flows along the vehicle longitudinal direction in communication with the gas introduction port. Lateral orientation that forms a gas flow that wraps around the vertical guide seam through the upper lateral guide seam A gas flow is formed on the side of the vertical guide seam portion, and communicates with the gas introduction port so that the inflator gas flows downward in the vehicle and flows under the upper horizontal guide seam portion through the vertical guide seam portion. A vertical gas duct is formed, and the main chamber is expanded and expanded obliquely downward in the longitudinal direction of the vehicle with a gas flow that flows into and fills the inside of the guide seam from both the horizontal gas duct and the vertical gas duct. To do.

  A curtain airbag device for a vehicle according to the present invention is a curtain airbag device for a vehicle including an airbag main body that is deployed and inflated downward along a side window from a roof, and the airbag main body includes an inflator. A gas introduction port for introducing gas and a pair of front and rear front main chambers and rear main chambers arranged in parallel in the vehicle front-rear direction in an airbag space surrounded by a seam, wherein the front main chamber includes at least an upper lateral guide A vertical guide seam portion is connected to the rear end of the seam portion, and is bent and surrounded by a front guide seam formed in the airbag space, and the rear main chamber includes at least an upper lateral guide seam. The airbag is connected to the longitudinal guide seam part at the front end of the part and folded. The upper side guide seam portion is surrounded by a rear guide seam formed in the interior, and communicated with the gas introduction port above the upper side guide seam portion so that inflator gas flows forward and rearward of the vehicle. A lateral gas duct is formed as a gas flow that circulates toward the vertical guide seam portion through the guide seam portion, and the vertical guide seam portions of the front guide seam and the rear guide seam are disposed to face each other. Between the seam portions, the inflator gas communicates with the gas introduction port, and the inflator gas flows downward to the vehicle and generates a gas flow that wraps around the upper horizontal guide seam portion via the vertical guide seam portion. A longitudinal chamber that expands and expands downward is formed, and the front main chamber and the above Each of the side main chambers is expanded and expanded toward the vehicle front obliquely downward and the vehicle rear obliquely downward with a gas flow that flows into and fills the inside of the front guide seam and the inside of the rear guide seam from both the lateral gas duct and the vertical chamber. It is characterized by that.

  Preferably, the longitudinal chamber is positioned at a B-pillar position of the vehicle, and is deployed and inflated so as to overlap along the B-pillar so as to draw the airbag body inwardly.

  The airbag main body is formed with a front chamber that is in communication with the front main chamber and into which inflator gas flows in, in front of the front main chamber. It is desirable to be positioned at the pillar position and to be deployed and inflated so as to overlap the A pillar.

  It is preferable that at least the front chamber is formed with an outer contour whose lower part reaches below the belt line so as to overlap with the belt line of the vehicle door when expanded.

  It is desirable that a strap for connecting the airbag main body and the A pillar is provided.

  A rear chamber is formed in the airbag main body at a rear side of the rear main chamber and communicated with the rear main chamber and into which inflator gas flows. The rear chamber is positioned at a C pillar position of the vehicle. It is preferable that the C pillar is expanded and inflated.

  In the guide seam forming the rear main chamber, an additional seam portion is preferably formed in parallel with the vertical guide seam portion from the upper lateral guide seam portion in order to partition the rear main chamber forward and backward.

  An additional chamber that is in communication with the rear chamber and into which inflator gas flows is formed in the airbag main body behind the rear chamber, and the additional chamber is deployed and inflated behind the C pillar. preferable.

  In the curtain airbag device for a vehicle according to the present invention, the occupant protection performance can be accurately ensured even when the occupant is in the non-regular position, and the occupant protection function against the occupant's outside release and the side collision Can be appropriately incorporated, and all three passenger protection performances can be satisfied.

1 is a front view showing a preferred embodiment of a curtain airbag device for a vehicle according to the present invention in a state where an airbag main body is deployed and inflated inside a vehicle. It is front sectional drawing of the airbag main body of the curtain airbag apparatus for vehicles shown in FIG. In FIG. 1, it is an AA arrow directional cross-sectional view. It is a principal part enlarged view which shows the modification of the curtain airbag apparatus for vehicles concerning this invention. It is a principal part enlarged view which shows the other modification of the curtain airbag apparatus for vehicles concerning this invention.

  Preferred embodiments of a curtain airbag device for a vehicle according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a front view showing a state in which an airbag body of a curtain airbag device for a vehicle according to the present embodiment is deployed and inflated inside the vehicle, and FIG. 2 is an airbag of the curtain airbag device for a vehicle shown in FIG. FIG. 3 is a front sectional view of the main body, and FIG. 3 is a sectional view taken along line AA in FIG.

  The curtain airbag device 1 for a vehicle is mainly composed of an airbag body 2 that is deployed and inflated, and an inflator 3 that introduces an inflator gas G into the airbag body 2.

  The airbag main body 2 of the curtain airbag device 1 for a vehicle according to the present embodiment has a length dimension that covers from the position of the A pillar 4 to the rear side window 9 behind the C pillar 6 along the longitudinal direction of the vehicle. It is formed. In addition, the airbag main body 2 has a front side window 7 between the A pillar 4 and the B pillar 5 and a central side window 8 between the B pillar 5 and the C pillar 6 in the vertical height direction of the vehicle. , As well as the height dimension covering all of the rear side window 9.

  The airbag main body 2 is attached to the roof of the vehicle, specifically, the periphery of the roof side rail 10 and fixed to the periphery of the roof side rail 10 while being wound or folded. Stored and installed. The rear end portion of the airbag main body 2 is connected to the roof and its peripheral portion at the rear position of the rear side window 9. In the present embodiment, a strap 11 that connects the front edge of the airbag body 2 and the A pillar 4 is housed and provided inside the A pillar 4.

  The inflator 3 is in the form of a cylinder and is fixedly attached to the periphery of the roof side rail 10 behind the B pillar 5. In the vehicle curtain airbag device 1, the airbag body 2 is directed downward from the roof side rail 10 along the side windows 7 to 9 by introducing the inflator gas G from the inflator 3 to the stored airbag body 2. It is designed to expand and expand.

  As is well known, the airbag body 2 is formed by joining a single folded fabric material or two superimposed fabric materials with an annular seam S formed by stitching or joining. You may form by the bag weave in which an edge part forms a seam. In the airbag main body 2, an airbag space is formed inside the annular seam S. Even if the seam S is not ring-shaped, it is only necessary that the airbag space can be formed inside the seam S by connection with other seams.

  In the annular seam S, a gas introduction port 12 into which the inflator 3 is inserted and the inflator gas G is introduced is formed in a form in which this is partially cut away. In the illustrated example, the gas introduction port 12 is formed at the center of the upper end of the airbag body 2, and in the illustrated example, at the rear position of the B pillar 5. Inflator gas G is introduced from the gas introduction port 12 into the airbag space surrounded by the annular seam S.

  In the airbag space, a pair of front main chamber 14 and rear main chamber 15 are formed side by side in the vehicle longitudinal direction by a combination of the annular seam S and the guide seam 13.

  First, the front main chamber 14 will be described. A front guide seam 13 is formed in the airbag space. The front guide seam 13 may be formed by continuous bonding or intermittent bonding. The front guide seam 13 includes, in parallel with the upper edge Su of the annular seam S, an upper lateral guide seam portion 13a extending from the front of the B pillar 5 toward the A pillar 4 in the longitudinal direction of the vehicle, It is formed from a vertical guide seam portion 13b extending along the pillar 5 downward in the height direction of the vehicle.

  The front guide seam 13 is formed in a form that is bent by connecting the upper end of the vertical guide seam portion 13b to the rear end of the upper horizontal guide seam portion 13a. The front end of the upper lateral guide seam portion 13a is formed by bending downward. The lower end of the vertical guide seam portion 13b is formed to be bent forward. Accordingly, the front guide seam 13 is generally formed in an L-shape, J-shape, U-shape or C-shape in which the upper lateral guide seam portion 13a and the vertical guide seam portion 13b form two sides.

  The front guide seam 13 is configured such that the lower side of the upper horizontal guide seam portion 13a faces the lower edge S1 of the annular seam S, and the front side of the vertical guide seam portion 13b faces the front edge Sf of the annular seam S. A front main chamber 14 is formed on the inner side of the front guide seam 13 surrounded by the front guide chamber 14 so as to face the vehicle front obliquely downward.

  In the present embodiment, in order to form the front chamber 16 in front of the front main chamber 14, the annular seam S is continuously formed with a front seam 17 that forms a part of the annular seam S. The vertical guide seam 13 b faces the front seam 17. The front seam 17 is formed from the upper edge Su of the annular seam S downward in the vehicle height direction, and the lower end thereof is set to be positioned below the lower end of the vertical guide seam portion 13b.

  The upper lateral guide seam portion 13a of the front guide seam 13 is formed at a distance downward from the upper edge Su of the annular seam S, whereby the upper edge Su of the annular seam S is located above the upper lateral guide seam portion 13a. In between, a lateral gas duct 18 is formed from the B pillar 5 toward the front of the vehicle.

  The inlet side of the lateral gas duct 18 defined by the rear end of the upper lateral guide seam portion 13a located in front of the B pillar 5 is communicated with the gas introduction port 12 located at the rear. The outlet side of the sideways gas duct 18 faces the front seam 17 that is part of the annular seam S. Accordingly, the inflator gas G that flows into the sideways gas duct 18 and travels forward of the vehicle is guided by the front seam 17 and flows downward toward the vehicle.

  The rear main chamber 15 is formed in the same manner as the front main chamber 14, and is directed obliquely downward to the rear of the vehicle. A rear guide seam 13 is formed in the airbag space. The rear guide seam 13 may also be formed by continuous bonding or intermittent bonding. The rear guide seam 13 is parallel to the upper edge Su of the annular seam S, and has an upper lateral guide seam portion 13a extending from the rear of the B pillar 5 toward the C pillar 6 and rearward in the longitudinal direction of the vehicle. It is formed from a vertical guide seam portion 13b extending along the pillar 5 downward in the height direction of the vehicle.

  The rear guide seam 13 is formed in a form in which the upper end of the vertical guide seam portion 13b is connected to the front end of the upper horizontal guide seam portion 13a and bent. The rear end of the upper lateral guide seam portion 13a is formed by bending downward. The lower end of the vertical guide seam portion 13b is formed by bending backward. Therefore, the rear guide seam 13 as a whole is also formed in an L-shape, J-shape, U-shape, or C-shape in which the upper lateral guide seam portion 13a and the vertical guide seam portion 13b form two sides.

  The rear guide seam 13 is configured such that the lower side of the upper lateral guide seam portion 13a faces the lower edge S1 of the annular seam S, and the rear side of the vertical guide seam portion 13b faces the rear edge Sr of the annular seam S. A rear main chamber 15 is formed on the inner side of the rear guide seam 13 surrounded by the rearwardly facing rearwardly downwardly facing vehicle.

  In the present embodiment, in order to form the rear chamber 19 behind the rear main chamber 15, the annular seam S is continuously formed with a rear seam 20 that forms a part of the annular seam S. The vertical guide seam 13 b faces the rear seam 20. The rear seam 20 is formed from the upper edge Su of the annular seam S downward in the vehicle height direction, and the lower end thereof is set to be positioned below the lower end of the vertical guide seam portion 13b.

  The upper lateral guide seam portion 13a of the rear guide seam 13 is formed to be spaced downward from the upper edge Su of the annular seam S, whereby the upper edge Su of the annular seam S is located above the upper lateral guide seam portion 13a. In between, a lateral gas duct 18 from the B pillar 5 toward the rear of the vehicle is formed.

  The inlet side of the lateral gas duct 18 defined by the front end of the upper lateral guide seam portion 13a located behind the B pillar 5 is communicated with the gas introduction port 12 located almost immediately above. The outlet side of the sideways gas duct 18 faces the rear seam 20 that is part of the annular seam S. Therefore, the inflator gas G that flows into the sideways gas duct 18 and moves toward the rear of the vehicle is guided by the rear seam 20 and flows toward the lower side of the vehicle.

  The rear guide seam 13 forming the rear main chamber 15 and the front main chamber 14 and the vertical guide seam portion 13b of the front guide seam 13 are formed in parallel to face each other with the B pillar 5 interposed therebetween. Between the vertical guide seam portions 13b, a vertical chamber 21 is formed along the B pillar 5 so as to overlap the B pillar 5 from the vehicle inner side toward the lower side of the vehicle.

  The inlet side of the vertical chamber 21 defined by the upper end of the vertical guide seam portion 13b communicates with the gas introduction port 12 located almost directly above. The outlet side of the vertical chamber 21 defined by the lower end of the vertical guide seam portion 13b faces the lower edge S1 of the annular seam S. Therefore, the vertical chamber 21 is expanded and expanded toward the vehicle lower side by the inflator gas G flowing into the chamber 21.

  Further, the inflator gas G flowing downward in the vehicle in the vertical chamber 21 is guided by the lower edge S1 of the annular seam S and distributed to the front main chamber 14 side in front of the vehicle and the rear main chamber 15 side in the rear of the vehicle. Flowed. The vertically extending chamber 21 that expands and inflates contacts the B pillar 5 from the inside of the vehicle and pushes the entire airbag body 2 inward of the vehicle by the contact reaction force.

  Although the vertical chamber 21 itself is deployed and inflated, it also has a function of circulating the inflator gas G to other parts of the airbag body 2, so that it is called a vertical gas duct formed on the side of the vertical guide seam portion 13 b. You can also.

  The inflator gas G introduced from the gas introduction port 12 is guided to the front seam 17 from the lateral gas duct 18 in the front of the vehicle, and flows toward the vertical guide seam portion 13b via the upper lateral guide seam portion 13a. At the same time, the gas flow is guided from the vertical chamber 21 to the lower edge S1 of the annular seam S and flows under the upper horizontal guide seam portion 13a via the vertical guide seam portion 13b. 21 flows into the front guide seam 13 from both sides and fills up, whereby the front main chamber 14 is expanded and inflated downward and obliquely downward in front of the vehicle at a position facing the front side window 7 (indicated by an arrow X in the figure). Show).

  Also in the rear of the vehicle, the inflator gas G introduced from the gas introduction port 12 is guided to the rear seam 20 from the lateral gas duct 18 and becomes a gas flow that goes around the vertical guide seam portion 13b via the upper lateral guide seam portion 13a. At the same time, the gas flow is guided from the vertical chamber 21 to the lower edge S1 of the annular seam S, and circulates below the upper horizontal guide seam portion 13a via the vertical guide seam portion 13b. From both sides, the air flows into the rear guide seam 13 and fills up. As a result, the rear main chamber 15 is expanded and inflated downward and rearward in the vehicle rearward direction at a position facing the central side window 8 (indicated by an arrow Y in the figure). ).

  The front chamber 16 is formed between the front main chamber 14 and the A pillar 4 inside the annular seam S. The front chamber 16 communicates with the front main chamber 14 via a front port 22 formed between the lower end of the front seam 17 and the lower edge Sl of the annular seam S.

  The front port 22 is formed at an obliquely lower front position of the vehicle where the front main chamber 14 expands and expands, and the gas G accompanying the expansion and expansion flows into the front port 22. Accordingly, the front port 22 is formed in the lower part of the front chamber 16. The front chamber 16 is expanded and expanded upward in the vehicle height direction on the front side of the front side window 7 by the inflator gas G flowing from the front main chamber 14 via the front port 22.

  The front chamber 16 is formed so as to be at least partially overlapped with the A pillar 4 from the inside of the vehicle by being inflated and deployed. The front chamber 16 that expands and inflates contacts the A pillar 4 from the inside of the vehicle and pushes the entire airbag body 2 inward of the vehicle by the contact reaction force.

  When the front chamber 16 and the front main chamber 14 and the vicinity of the front chamber 16 are inflated by the lower edge Sl of the annular seam S being curved downward in a convex shape, the belt line 23 of the vehicle door In order to overlap, the lower part is formed with an outline that reaches below the belt line 23.

  The rear chamber 19 is configured in substantially the same manner as the front chamber 16. The rear chamber 19 is formed inside the annular seam S so as to overlap the C pillar 6 from the vehicle inner side at the position of the C pillar 6. The rear chamber 19 communicates with the rear main chamber 15 via a rear port 24 formed between the lower end of the rear seam 20 and the lower edge Sl of the annular seam S.

  The rear port 24 is formed at a position obliquely below the vehicle where the rear main chamber 15 expands and expands, and a gas G accompanying the expansion and expansion flows into the rear port 24. Accordingly, the rear port 24 is formed in a lower portion of the rear chamber 19. The rear chamber 19 is expanded and expanded upward in the vehicle height direction along the C pillar 6 by the inflator gas G flowing from the rear main chamber 15 through the rear port 24.

  The rear chamber 19 that expands and inflates contacts the C pillar 6 from the inside of the vehicle and pushes the entire airbag body 2 into the vehicle by the contact reaction force.

  Next, the operation of the vehicle curtain airbag device 1 according to the present embodiment will be described. In the airbag main body 2, the front and rear main chambers 14 and 15 are first deployed and inflated, and then the front and rear chambers 16 and 19 are deployed and inflated to complete the entire deployment and inflation action. More specifically, the inflator gas G of the inflator 3 introduced from the gas introduction port 12 first flows into the vertical chamber 21 and is distributed and flows into the lateral gas ducts 18 at the front and rear in the longitudinal direction of the vehicle. .

  The vertical chamber 21 instantly expands downward in the vehicle height direction and expands to form a firm vertical frame at the central position of the airbag body 2. Further, the vertical chamber 21 draws the entire airbag main body 2 inward of the vehicle by the contact reaction force against the B pillar 5, and advances the deployment and inflation action inward of the vehicle.

  The side-facing gas ducts 18 are also instantly inflated forward and rearward in the longitudinal direction of the vehicle, forming a firm lateral frame at the upper position of the airbag body 2.

  The inflator gas G blown out from the lateral gas duct 18 is guided by the front seam 17 and the rear seam 20 and flows downward in the height direction of the vehicle, and the upper lateral guide is arranged by the arrangement of the lower edge Sl of the annular seam S and the guide seam 13. The gas flows into the main chambers 14 and 15 surrounded by the guide seam 13 by going around the vertical guide seam 13b through the seam 13a. Similarly, the inflator gas G blown out from the vertical chamber 21 is guided by the lower edge S1 of the annular seam S and distributed in the front-rear direction of the vehicle, while the front seam 17, the rear seam 20, and the guide seam 13 arrange the vertical guide. The gas flows into the main chambers 14 and 15 through the seam portion 13b and below the upper lateral guide seam portion 13a.

  The front and rear main chambers 14 and 15 filled with the inflator gas G by these gas flows expand and expand toward the vehicle front diagonally downward and the vehicle rear diagonally downward, respectively.

  In the expansion and expansion process of the main chambers 14 and 15, the inflator gas G further flows toward the front port 22 and the rear port 24 that are located facing the direction in which the main chambers 14 and 15 expand. The inflator gas G flowing into the front port 22 and the rear port 24 expands and expands the front chamber 16 and the rear chamber 19 at a timing later than the completion of expansion and expansion of the main chambers 14 and 15. The front chamber 16 and the rear chamber 19 reliably hold the entire airbag body 2 that has completed the inflating and expanding action inside the vehicle by the contact reaction force on the upper part of the A pillar 4 and the C pillar 6.

  The vehicular curtain airbag device 1 according to the present embodiment described above can control the deploying and inflating direction of the main chambers 14 and 15 obliquely downward in the front of the vehicle and the rear of the vehicle. Even when the main chambers 14 and 15 are located, the main chambers 14 and 15 are expanded obliquely, and at this time, the expansion timing of the main chambers 14 and 15 near the passenger's head is delayed, 15 can be inserted between the occupant's head and the side windows 7 and 8 in a state where the thickness is thin, and the situation where the deployment and inflation force of the airbag body 2 acts on the head from above is prevented. And the occupant injury value can be reduced.

  Since the contact reaction force by the vertical chamber 21 that expands and expands along the B pillar 5 and the front chamber 16 that expands and expands at a timing later than the front main chamber 14 to shield the front side window 7 are provided. It is possible to appropriately prevent the passenger from being released from the vehicle when a rollover occurs.

  Since the abutting reaction force due to the longitudinal chamber 21 that expands and expands along the B pillar 5 and the rear chamber 19 that overlaps and expands along the C pillar 6 at a later timing than the rear main chamber 15 are provided. The rear side main chamber 15 located between the chambers 21 and 19 can shield the central side window 8 to prevent the passenger from being released from the vehicle.

  Since at least the front chamber 16 is formed with an outer contour that lowers below the belt line 23 so that the front chamber 16 overlaps with the belt line 23 of the vehicle door when expanded, the front chamber 16 contacts the belt line 23 from the belt line 23. The contact force can be obtained, and the front side window 7 can be almost completely shielded, so that the effect of preventing release from the vehicle can be further improved. In particular, when the front chamber 16 is arranged close to the outside of the vehicle, it is possible to ensure the action of preventing the vehicle outside discharge by the front chamber 16 by this overlap.

  Since the strap 11 for connecting the airbag main body 2 and the A pillar 4 is provided, it is possible to prevent the gap between the airbag main body 4 and the A pillar 4 from expanding, and to further enhance the effect of preventing release from the vehicle. It is.

  By the front chamber 16 and the rear chamber 19 in which the expansion / expansion completion time is delayed with respect to the main chambers 14 and 15, the expansion / expansion completion time of the main chambers 14 and 15 can be substantially shortened. It is possible to improve the protection performance. Further, the inflator gas G flows from the main chambers 14 and 15 into the front chamber 16 and the rear chamber 19, whereby the hardness of the main chambers 14 and 15 can be controlled. The control of the hardness and the timing at which the expansion and expansion of the front chamber 16 and the rear chamber 19 are completed can be adjusted by setting the sizes of the front port 22 and the rear port 24.

  Therefore, according to the curtain airbag device 1 for a vehicle according to the present embodiment, the occupant protection performance can be ensured accurately even when the occupant is in the non-regular position, and the occupant can prevent the vehicle from being released outside the vehicle or against a side collision. An occupant protection function can be appropriately incorporated, and all these three occupant protection performances can be satisfied.

  FIG. 4 shows a modification of the above embodiment. In this modified example, an additional seam portion 25 is formed in the guide seam 13 forming the rear main chamber 15 in parallel with the vertical guide seam portion 13b from the upper lateral guide seam portion 13a in order to partition the rear main chamber 15 forward and backward. Is done. The lower ends of the vertical guide seam portion 13b and the additional seam portion 25 are both close to the lower edge Sl of the annular seam S. When the central side window 8 is large, the capacity of the rear main chamber 15 increases, and it may be difficult to immediately expand and inflate. In such a case, the rear main chamber 15 is divided forward and backward by the additional seam portion 25, so that the rear portion is a preceding deployment chamber portion 15a that is developed obliquely downward in the rear of the vehicle, and the front portion is effective for side collision countermeasures. It can be a delay chamber portion 15b.

  FIG. 5 shows another modification. In this modified example, an additional chamber 26 is provided in the annular seam S of the airbag main body 2 so as to be located behind the rear chamber 19 at the C pillar 6 position and communicated with the rear chamber 19 and into which the inflator gas G flows. The additional chamber 26 is expanded and expanded behind the C pillar 6. The additional chamber 26 is formed by appropriately partitioning with an additional seam 27 connected to the annular seam S. If comprised in this way, the delay chamber (additional chamber 26) effective in a side collision countermeasure can be provided with respect to the large sized van etc. which a seat is provided facing the rear side window 9.

  In the said embodiment and modification, although the gas fill port 12 with which the airbag main body 2 is equipped was demonstrated exemplifying the center fill type which forms in the vehicle front-back direction center part, even if it is a rear fill type or a front fill type Of course it is good.

  The vehicle curtain airbag device described above is a preferred example of the present invention, and other embodiments can be implemented or performed by various methods. In particular, the present invention is not limited to the detailed shape, size, configuration, and the like of the components shown in the accompanying drawings unless otherwise stated 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.

DESCRIPTION OF SYMBOLS 1 Vehicle curtain airbag apparatus 2 Airbag main body 4 A pillar 5 B pillar 6 C pillar 7-9 Side window 10 Roof side rail 11 Strap 12 Gas introduction port 13 Front and back guide seam 13a Upper side guide seam part 13b Vertical guide Seam portion 14 Front main chamber 15 Rear main chamber 16 Front chamber 18 Horizontal gas duct 19 Rear chamber 21 Vertical chamber 23 Vehicle door belt line 25 Additional seam portion 26 Additional chamber G Inflator gas S Annular seam

Claims (9)

A curtain airbag device for a vehicle having an airbag main body that is deployed and inflated downward along a side window from a roof,
The airbag body includes a gas introduction port for introducing inflator gas, and a main chamber formed in an airbag space surrounded by the seam,
The main chamber is surrounded by a guide seam formed in the airbag space in a form in which at least an upper lateral guide seam portion and a vertical guide seam portion are connected and bent, and is partitioned inside thereof.
Above the upper lateral guide seam portion, a gas flow communicating with the gas introduction port and flowing in the inflator gas along the longitudinal direction of the vehicle toward the longitudinal guide seam portion through the upper lateral guide seam portion, A sideways gas duct is formed,
On the side of the vertical guide seam portion, there is a vertical gas duct that communicates with the gas introduction port, and inflator gas flows downward in the vehicle and forms a gas flow that flows around the upper horizontal guide seam portion through the vertical guide seam portion. Formed,
The curtain air bag device for a vehicle according to claim 1, wherein the main chamber is expanded and inflated obliquely downward in the vehicle front-rear direction by a gas flow that flows into and fills the inside of the guide seam from both the lateral gas duct and the vertical gas duct. A curtain airbag device for a vehicle having an airbag main body that is deployed and inflated downward along a side window from a roof,
The airbag main body includes a gas introduction port for introducing an inflator gas, and a pair of front and rear main chambers and a rear main chamber arranged in parallel in the vehicle front-rear direction in an airbag space surrounded by a seam,
The front main chamber is surrounded by a front guide seam formed in the airbag space in a form in which a vertical guide seam portion is connected and bent at the rear end of at least the upper lateral guide seam portion, and is partitioned on the inside thereof.
The rear main chamber is surrounded by a rear guide seam formed in the airbag space in a form in which a vertical guide seam portion is connected to the front end of at least the upper horizontal guide seam portion and bent, and is partitioned on the inside.
Above the upper lateral guide seam portion, a gas flow communicated with the gas introduction port so that the inflator gas flows forward and rearward of the vehicle and flows around the vertical guide seam portion via the upper lateral guide seam portion. A sideways gas duct is formed,
The longitudinal guide seam portions of the front guide seam and the rear guide seam are arranged to face each other,
Between the vertical guide seam portions, the inflator communicates with the gas introduction port, and the inflator gas flows downward to the vehicle and generates a gas flow that flows around the upper horizontal guide seam portion through the vertical guide seam portion. A vertical chamber is formed that expands and expands toward the bottom of the vehicle with gas,
The front main chamber and the rear main chamber are respectively directed obliquely downward in the front of the vehicle and obliquely downward in the rear of the vehicle with a gas flow that flows into and fills the inside of the front guide seam and the inside of the rear guide seam from both the lateral gas duct and the vertical chamber. A curtain airbag device for a vehicle, which is deployed and inflated toward the vehicle.   The vertical chamber is positioned at a B-pillar position of the vehicle, and is deployed and inflated so as to overlap along the B-pillar so as to draw the airbag body inwardly of the vehicle. Curtain air bag device for vehicles.   The airbag main body is formed with a front chamber that is in communication with the front main chamber and into which inflator gas flows in, in front of the front main chamber. 4. The curtain airbag device for a vehicle according to claim 2, wherein the curtain airbag device is positioned at a pillar position and is deployed and inflated so as to overlap the A pillar.   5. The front chamber according to claim 4, wherein at least the front chamber is formed with an outer contour whose lower part extends below the belt line so as to overlap with a belt line of a vehicle door when expanded. Curtain airbag device for vehicles.   The curtain airbag device for a vehicle according to any one of claims 1 to 5, wherein a strap that connects the airbag main body and the A pillar is provided.   A rear chamber is formed in the airbag main body at a rear side of the rear main chamber and communicated with the rear main chamber and into which inflator gas flows. The rear chamber is positioned at a C pillar position of the vehicle. The curtain airbag device for a vehicle according to any one of claims 2 to 6, wherein the curtain airbag device is deployed and inflated so as to overlap the C pillar.   The guide seam forming the rear main chamber has an additional seam portion formed in parallel with the vertical guide seam portion from the upper lateral guide seam portion to partition the rear main chamber forward and backward. The curtain airbag device for a vehicle according to any one of claims 2 to 7.   In the airbag body, an additional chamber is formed on the rear side of the rear chamber so as to communicate with the rear chamber and into which inflator gas flows. The additional chamber is deployed and inflated behind the C pillar. The curtain air bag device for vehicles according to claim 7 or 8 characterized by things.

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