JP5577134B2 - Curtain airbag device - Google Patents

Description

  The present invention relates to a curtain airbag device including a curtain airbag that inflates and deploys along a side surface of a passenger compartment. In particular, the present invention relates to a configuration of a curtain airbag that inflates and deploys along a side surface of a passenger compartment.

  In recent years, many vehicles with curtain airbags that inflate and deploy along the side of the passenger compartment have been used for the purpose of protecting the heads of passengers in accidents such as side collisions and rollovers. Yes. When an accident such as a side collision or rollover is detected on the vehicle, or when such an accident is predicted, the inflation gas injected from the inflator of the curtain airbag device flows into the curtain airbag. Then, the curtain airbag is inflated and deployed.

  At this time, as the curtain airbag is inflated and deployed, the lower end of the roof side garnish (the door side of the roof side garnish) is pushed open upward in the vehicle interior, and the curtain airbag passes through the opened opening. Developed in a curtain shape downward. The occupant's head can be protected by the inflated and deployed curtain airbag.

  Generally, the curtain airbag device used to protect the occupant's head and the like has an appropriate internal pressure of the curtain airbag when the occupant's head is received by the curtain airbag, and Those that can be maintained for a certain period of time without exhausting the internal gas are said to exhibit more preferable protection performance against collision and rollover.

  As the curtain airbag device configured as described above, an airbag device (see, for example, Patent Document 1), an occupant protection device (see, for example, Patent Document 2), and the like have been proposed. The airbag device described in Patent Document 1 is proposed by the applicant of the present application. And here, it demonstrates as the prior art example 1 in this invention. In FIG. 7, the state which has arrange | positioned the airbag in the airbag apparatus of patent document 1 to the vehicle is shown.

  As shown in FIG. 7, the airbag 40 which is folded and stored in the roof side portion 50 of the vehicle is deployed along the window portion 48 and the center pillar 49 when inflated and deployed. The airbag 40 is provided with a pillar covering portion 41 that covers and expands the center pillar 49, and a lower inflating portion 42 is provided continuously below the pillar covering portion 41. A connecting line portion 43 that connects the pair of base fabric portions 46 is provided along the pillar covering portion 41. The connecting line portion 43 includes a straight portion 44 substantially along the center pillar 49 and a crossing portion 45 that smoothly curves from the lower end portion of the straight portion 44 and overlaps a part of the center pillar 49. .

  By configuring the curtain airbag device covering the window portion disposed on the side of the vehicle in this way, it is possible to suppress the feeling of bottoming at the pillar portion and to prevent the passenger from being released from the vehicle.

  An occupant protection device described in Patent Document 2 will be described as Conventional Example 2 in the present invention. In FIG. 8, the side view of the airbag in the passenger | crew protection device of patent document 2 is shown. As shown in FIG. 8, an occupant protection device is disposed along the upper edge of the window on the side of the vehicle body, and the airbag 60 is inflated and deployed so as to cover the inside of the vehicle compartment 76 of the window at the time of a vehicle collision.

  The airbag 60 includes first and second main inflatable portions 61 and 62 and first to fifth sub-inflatable portions 63 to 67, except for the seating position of the occupant 78 in the airbag 60. A first sub-deployment portion 68 and a second sub-deployment portion 69 that extend downward from the lower edge 77 of the window frame are formed at these locations.

  The first sub expansion part 68 is configured as a fourth sub expansion part 66 and is connected to the first main expansion part 61 via a communication hole 71 having a reduced diameter. The second sub-expansion part 69 is configured as a fifth sub-expansion part 67 and is connected to the second main expansion part 62 via a communication hole 72 having a reduced diameter. Further, a fourth fracture portion 74 is formed in the fourth sub-expansion portion 66, and a fifth fracture portion 75 is formed in the fifth sub-expansion portion 67.

  When the airbag 60 is inflated and deployed, the fourth sub-inflation portion 66 and the second sub-inflation portion 66 of the first sub-deployment portion 68 gradually gradually after the first main inflating portion 61 and the second main inflating portion 62 start inflating and deploying. The fifth sub-expansion part 67 and the like of the sub-deployment part 69 can be inflated.

  With this configuration, when the occupant 78 comes into contact with the first main inflating portion 61 in a state where the air bag 60 is filled with fluid gas, the first, second, and fourth sub inflating portions 63 and 64 are arranged. , 66, the first, second, and fourth fracture portions 73, 79, 74 are gradually broken. As a result, the volumes of the first, second, and fourth sub-inflatable portions 63, 64, and 66 can be gradually increased, the internal pressure of the first main inflatable portion 61 is lowered, and the impact on the occupant 78 is reduced. It is configured to absorb smoothly.

  Similarly, when the occupant 78 comes into contact with the second main inflatable portion 62, the broken portions in the third and fifth sub-inflatable portions 65 and 67 are cut, and the third and fifth sub-inflatable portions 65 and 67 are cut. Gradually increase the volume of 67. Thus, the internal pressure of the second main inflating portion 62 is lowered, and the impact applied to the occupant 78 is smoothly absorbed.

JP 2008-7065 A JP 2007-161167 A

  The curtain airbag device is also required to have a function of protecting an occupant who has been in the vehicle from being thrown out of the vehicle window when an accident such as a side collision or rollover occurs on the vehicle. . Therefore, the curtain airbag is required to be stably deployed inside the window frame. In addition, when the curtain airbag is inflated and deployed, it is necessary that the position where the occupant's head is caught does not protrude beyond the window by a predetermined amount.

  When the head of the occupant comes into contact with the curtain airbag, if the curtain airbag itself that is inflated and deployed inside the window frame protrudes outside the window together, it catches the occupant's head. The position is a position that protrudes further than the predetermined amount with respect to the outside of the window.

  In the airbag device described in Patent Document 1, since the lower inflation portion 42 is arranged below the lower edge portion of the window frame when the airbag 40 is inflated and deployed, the curtain airbag that is inflated and deployed is used. It is possible to prevent itself from protruding outside the window. However, since the lower inflatable portion 42 formed on the lower side of the airbag 40 is inflated, the capacity of the airbag 40 is large.

  In order to inflate and deploy the large-capacity airbag 40, a large inflator is required, and an installation space for disposing the large inflator must be secured in a vehicle having a small installation space.

  In the occupant protection device described in Patent Document 2, the first sub-deployment portion 68 and the second sub-deployment portion 69 are formed by extending downward the lower end portion of the curtain airbag where there is no occupant. However, in order to reduce the internal pressure in the first main inflatable portion 61 and the second main inflatable portion 62 after the occupant's head abuts on the first main inflatable portion 61 and the second main inflatable portion 62, The volume of the fourth sub-expansion part 66 in the development part 68 and the fifth sub-expansion part 67 in the second sub-expansion part 69 is configured to gradually increase.

  Further, the first sub-expansion portion 63 is configured to gradually increase the volume of the first sub-expansion portion 63 in order to reduce the internal pressure in the first main expansion portion 61. For this reason, a first fracture portion 73 is formed in the first sub-expansion portion 63. Moreover, the communication hole 70 that connects the first main expansion portion 61 and the first sub expansion portion 63 is provided only on the lower end side of the first sub expansion portion 63, and is configured as a communication portion with a reduced diameter. ing.

  Further, a stitch that sews the base fabric of the airbag 60 is formed between the first sub-deployment portion 68 and the communication hole 70. The first sub-expansion part 68 is defined with respect to the first main expansion part 61 via the stitch part, and the first sub-expansion part 68 that is not sufficiently inflated is connected to the first main expansion part 61. On the other hand, it can be bent easily.

  Further, a stitch for sewing the base fabric of the airbag 60 is formed between the second sub-deployment portion 69 and the third sub-expansion portion 65. The second sub-expansion portion 69 is defined with respect to the third sub-expansion portion 65 through the stitch portion, and the second sub-expansion portion 69 that is not sufficiently expanded is connected to the third sub-expansion portion 65. On the other hand, it can be bent easily.

  Since it is configured in this manner, the first sub-deployment portion 68, the second sub-deployment portion 69, and the first sub-inflation portion 63 support the curtain airbag itself that protrudes outside the window. The strength of is weak. Thus, in the invention described in Patent Document 2, it is difficult to support the curtain airbag itself inside the window frame so that it does not protrude outside the window. In particular, the occupant protection device described in Patent Document 2 neither discloses nor suggests a configuration or problem for preventing the inflated and deployed curtain airbag itself from protruding outside the window.

  The invention of the present application can solve the problems in the above-described conventional example, and in particular, the invention described in Patent Document 1 is improved and the curtain airbag is inflated without using a large inflator. An object of the present invention is to provide a curtain airbag device that can be filled with gas at high speed and can prevent the inflated and deployed curtain airbag itself from protruding outside the window.

The object of the present invention can be achieved by the invention described in claim 1.
That is, the curtain airbag device of the present invention includes a curtain airbag that can be inflated and deployed along a window portion disposed on a side surface of the passenger compartment, and an inflator that supplies inflation gas to the curtain airbag. In the curtain airbag device that expands so that the inflated curtain airbag overlaps the vertical frame of the window portion,
The curtain airbag includes an upper side and a lower side, a first side connecting between one end of the upper side and the lower side, and a second side connecting between the other end of the upper side and the lower side. And the lower side portion has a protrusion expansion portion that extends downward beyond the waistline drawn by the lower end of the window portion ,
The protrusion inflating portion is configured as a lower end portion of a through columnar inflating portion continuous from a main inflating portion of the curtain airbag covering the window, and the inflating portion on the lower end side of the through columnar inflating portion A communication part for introducing gas is connected , and the communication part intersects with the through columnar expansion part and extends from the first side part to a center pillar or a rear peer to constitute a beam. It is said.

  In the present invention, a projection inflating portion is formed on the lower side portion of the curtain airbag, and the projection inflating portion serves as a lower end portion of a through columnar inflating portion continuous from the main inflating portion of the curtain airbag covering the window portion. It is configured. And the protrusion expansion | swelling part becomes a structure extended below beyond the waistline which the lower end of the window part covered with a curtain airbag draws. In addition, a communication portion for introducing an expansion gas is connected to the lower end portion side of the through-column-shaped expansion portion, and this communication portion is configured as a beam that intersects the through-column-shaped expansion portion.

  When the through-column-shaped inflating portion is inflated and deployed, the projecting inflating portion of the through-column-shaped inflating portion overlaps the trim portion of the door provided with the side window. In addition, the through-column-shaped inflatable portion can be configured as a column, and a beam that intersects the through-column-shaped inflatable portion configured as this column is connected to the through-column-shaped inflatable portion through the communicating portion. It can be configured using.

  Since it is configured in this way, the curtain airbag can be firmly held by the through-column-shaped inflating portion where the vertical frame of the window portion and the beam intersect, and the curtain airbag can be prevented from protruding outside the window. It can be surely prevented.

  In addition, since the communicating portion for introducing the expansion gas is connected to the lower end portion side of the through-column-shaped expansion portion, the expansion gas can be filled into the through-column-shaped expansion portion at a high speed. The columnar inflatable portion can be configured as a single columnar shape that can support the edge of the curtain airbag. And the beam which cross | intersects this through-column-shaped expansion part can be comprised using the communication part which introduce | transduces expansion gas.

  Furthermore, the through-column-shaped inflatable portion can be formed on the first side portion or the second side portion of the curtain airbag, or can be formed on a portion that does not overlap the vertical frame of the window portion. . When the through-column-shaped inflatable part is formed on the first side or second side of the curtain airbag, the through-column-shaped inflated part formed on the first side is arranged so as to overlap the front pillar. The through-column-shaped expansion portion formed on the second side portion can be disposed so as to overlap the rear pillar.

  In addition, when the through-column-shaped inflating part is formed in a portion that does not overlap with the vertical frame of the window part, it is inflated and deployed by the through-column-shaped inflating part and the vertical frame of the window part or the vehicle front pillar, center pillar, and rear pillar. The curtain airbag itself can be prevented from protruding outside the window. As described above, in the present invention, it is possible to improve the holding strength for preventing the inflated and deployed curtain airbag itself from protruding outside the window.

  Moreover, in this invention, like patent document 1, in order to support a curtain airbag, it is not necessary to comprise and inflate the lower expansion part 42 in the lower side of a curtain airbag, and the capacity | capacitance of an inflator is enlarged. There is no need. In addition, since the volume of the protrusion inflating portion can be configured as a smaller volume than the lower inflating portion 42 of Patent Document 1, the deployment speed and deployment distance of the curtain airbag are substantially the same as those of the conventional curtain airbag. As above, a curtain airbag device can be configured.

1 is a side view of a curtain airbag device inflated and deployed in a vehicle interior. (Example) It is a side view when a curtain airbag is developed. (Example) It is a side view which shows the modification of the curtain airbag apparatus expanded and deployed in the vehicle interior. (Example) It is a side view which shows the other modification of the curtain airbag apparatus expanded and deployed in the vehicle interior. (Example) It is a side view which shows another modification of the curtain airbag apparatus expanded and deployed in the vehicle interior. (Example) It is a graph which shows an experimental result when an impact load is applied to the curtain airbag which is inflated and deployed. (Examples and Comparative Examples) It is a side view of the curtain airbag inflated and deployed in the vehicle interior. (Conventional example 1) It is a side view when an airbag is developed. (Conventional example 2)

  Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The curtain airbag device according to the present invention will be described below with reference to FIGS. 1 to 6. However, the curtain airbag device according to the present invention has the configuration shown in FIGS. The present invention is not limited to the above, and various modifications can be made as long as the effects of the present invention can be obtained.

  As shown in FIG. 1, a curtain airbag device 1 includes a cover member (not shown) that houses a curtain airbag 2 (see FIG. 2), an inflator 25 that generates inflation gas, and the inflator 25 as a curtain airbag. 2 and a gas introduction part 12 connected to 2. The curtain airbag 2 can be attached to the roof side portion 4 via the attachment portion 11.

  When the occurrence of an accident such as a side collision or rollover with respect to the vehicle is detected, or the occurrence of such an accident is predicted, the inflation gas injected from the inflator 25 of the curtain airbag device 1 is used as the curtain airbag 2. The curtain airbag 2 is inflated and deployed.

  As the curtain airbag 2 is inflated and deployed, the lower end side of a cover member (not shown) is pushed upward on the vehicle interior side, and the curtain airbag 2 passes downward through the opened opening to form a curtain shape. Expand to. The inflated and deployed curtain airbag 2 can cover the side window 5 on the front seat side and the side window 6 on the rear seat side to protect the occupant's head. The side window 5 on the front seat side has side edge portions 5a and 5b in the longitudinal direction of the vehicle, and has an upper edge portion on the upper side and a lower edge portion 5c on the lower side. Similarly, the side window 6 on the rear seat side has side edge portions 6a and 6b in the longitudinal direction of the vehicle, has an upper edge portion on the upper side, and a lower edge portion 6c on the lower side. Yes.

  As a side view of the curtain airbag 2 in a state in which the curtain airbag 2 is inflated and deployed, FIG. 1 shows an inflated and deployed state in the passenger compartment, and FIG. 2 shows a side view showing the curtain airbag 2 itself taken out. ing.

  If necessary, the curtain airbag device 1 can be mounted along the mounting bracket formed by pressing a metal plate that attaches the curtain airbag 2 to the vehicle body panel or the folded curtain airbag 2, and deployed. Sometimes connected to the front end of the curtain airbag 2, a protector made of resin that protects the curtain airbag 2, a sleeve that can hold the shape of the folded curtain airbag 2, and a tubular or string-like shape-retaining member The dither belt 26 is provided.

The curtain airbag 2 is formed by superposing two base fabric panels 10 each having a basis weight of 200 g / m ² using, for example, 315 denier nylon 66 yarn, and joining the outer periphery of the overlapped base fabric panels 10 by an outer peripheral sewing portion 18. Can be formed into a bag shape. That is, the curtain airbag 2 has a bag-like shape including an upper side portion 31, a lower side portion 32, a first side portion 33 disposed on the front side of the vehicle, and a second side portion 34 disposed on the rear side of the vehicle. It has become.

As shown in FIG. 1 and FIG. 2, by directly stitching the opposing base fabric panels 10 with the second stitch 19 and the first stitch 21 inside the curtain airbag 2 surrounded by the outer periphery sewing portion 18, Each expansion part is formed. As each inflating part, the first side part inflating part as a continuous through-column-like inflating part formed along the first side part 33 is connected to the communicating path 22 and the communicating path 22 as a passage for the expanding gas. 13. Front seat inflatable portion 14 for protecting the front seat occupant, pillar covering portion 15 for preventing the occupant from coming into contact with the center pillar 8, and protecting the rear seat occupant along the second side portion 34. A second side expansion part 17 as a continuous through-column-shaped expansion part formed as a result, a secondary side expansion part 16 formed between the second side expansion part 17 and the pillar covering part 15, and a second side part expansion. In this configuration, an expansion portion 17 a formed between the portion 17 and the sub expansion portion 16 is provided.
The first side inflating portion 13, the front seat inflating portion 14, the pillar covering portion 15, the inflating portion 17a, and the second side inflating portion 17 are each configured as one of the main inflating portions in the curtain airbag 2. Yes.

  The upper end portion side and the lower end portion side of the first side portion inflating portion 13 are connected to the front seat inflating portion 14 via communication portions 23a and 23b. The thicknesses of the first side inflating portion 13, the front seat inflating portion 14, the pillar covering portion 15, and the second side inflating portion 17 when inflated are regulated by the substantially straight first stitches 21, respectively. Further, a second stitch 19 having an inverted U shape defines the communication path 22 and the pillar covering portion 15 and the second side inflating portion 17.

  Terminal protection circles 20 that are circular stitches are provided at both ends of the first stitch 21 and at the end of the second stitch 19. By providing the terminal protection circle 20, it is possible to obtain sufficient strength against securing of elongation in the base fabric panel 10 during expansion, prevention of wrinkles, and stress concentration.

  If necessary, the surface of the pair of base fabric panels 10 may be provided with a rubber coating, a silicone resin coating, or the like to reduce air permeability or to be in an air-impermeable state. it can. Further, as a constituent material of the base fabric panel 10, a woven fabric of nylon 6 yarn or polyester yarn can be used instead of nylon 66 yarn.

  Thus, the curtain airbag 2 can be configured as a bag body whose interior is partitioned by stitching the base fabric panel. In addition, a sealing agent is used as a sealing process for preventing gas leakage from the sewing thread holes by combining the first stitch 21 and the second stitch 19 inside the outer peripheral sewing portion 18 and the curtain airbag 2. You can also.

  Furthermore, the curtain airbag 2 can be configured as a bag body whose interior is partitioned by a bag weave such as a dobby weave or a jacquard weave, in addition to the base fabric panel 10 being sewn. A part of the air bag thus woven into a bag can be sewn and configured.

  A part of the inflation gas from the inflator 25 introduced from the gas introduction part 12 is introduced into the first side expansion part 13 from the communication part 23a through the communication path 22, and is in a state along the line I in the first state. The side inflating part 13 can be inflated and expanded. When the communication part 23b is opened while the first side expansion part 13 and the front seat expansion part 14 are inflated and expanded, the inflation gas can be introduced into the first side expansion part 13 also from the communication part 23b. .

  Thereby, the 1st side part expansion | swelling part 13 is vertically long and can be expand | deployed by one column shape. And the 1st side part expansion | swelling part 13 can be distribute | arranged to the state which overlapped with the trim part of the door provided with the roof side part 4, the front pillar 7, and the side window 5 at the front seat side. Moreover, the communication portion 23b can be configured as a beam that intersects the first side inflatable portion 13 that is vertically long and inflated and deployed in a single column shape. That is, the lower end side of the first side inflatable portion 13 can be configured in a lateral T-shape by the communication portion 23b, and the lower end side of the first side inflatable portion 13 is refracted by the trim portion of the door. Can be prevented.

  Further, a part of the expanded gas introduced from the gas introduction part 12 is introduced into the second side part expansion part 17, and the second side part expansion part 17 is formed in a vertically long single column shape along the line II. Can be inflated and deployed. And it can arrange | position to the state which overlapped with the trim part of the door provided with the roof side part 4, the rear pillar 9, and the side window 6 on the rear seat side. In addition, the communication portion 23c can be configured as a beam that intersects the second side inflatable portion 17 that is vertically long and inflated and deployed in a single columnar shape. That is, the lower end portion side of the second side inflatable portion 17 can be configured in a lateral T shape by the communication portion 23c, and the lower end portion side of the second side inflatable portion 17 is refracted by the door trim portion. Can be prevented.

  In this way, when the first side inflating portion 13 and the second side inflating portion 17 are each inflated and expanded in a single columnar shape, the projection inflating portion A which is the lower end portion of the first side inflating portion 13. As shown in FIG. 1, the protrusion inflating portion B which is the lower end portion of the second side inflating portion 17 includes the lower side portion 32 of the curtain airbag 2 and the lower edge portion 5c of the side window 5 on the front seat side and the rear side. The seat side side window 6 can be reliably extended downward from the lower edge portion 6c. That is, on the lower side of the waist line 30 drawn by the lower ends of the side window 5 and the side window 6 shown in FIG. The protrusion expanding portion B can be extended.

  Then, the front seat inflating portion 14 of the curtain airbag 2 that has been inflated and deployed can be held between the first side inflating portion 13 and the center pillar 8 that have been inflated into a single columnar shape. Thereby, even if the head of the passenger in the front seat comes into contact with the front seat inflating portion 14, it is possible to prevent the front seat inflating portion 14 from protruding outside the window.

  Further, the second side inflating portion 17 of the curtain airbag 2 that has been inflated and deployed can also be configured in a vertically long through-column shape, so that the head of the passenger in the rear seat abuts on the second side inflating portion 17. However, it is possible to prevent the second side inflating portion 17 from protruding outside the window. Even if the head of an occupant in the rear seat comes into contact with the sub-inflating portion 16, the sub-inflating portion 16 is located between the second side inflating portion 17 and the center pillar 8 inflated into a single column. It can be held securely.

Thereby, even if the head of the passenger in the rear seat comes into contact with the sub-expansion portion 16, it is possible to prevent the sub-expansion portion 16 from protruding outside the window.
In a vehicle without the center pillar 8, the side edge 5b of the front seat side window 5 and the side edge 6a of the rear seat side window 6 should be used instead of the center pillar. Can do.

  In this way, the first side inflating portion 13 and the second side inflating portion 17 can be inflated and deployed in a single log shape, and the projection inflating portion A of the first side inflating portion 13 inflated and deployed. And the protrusion expansion part B of the 2nd side part expansion part 17 can be made to contact | abut to a window frame below the waist line 30, respectively. As a result, the inflated and deployed curtain airbag 2 can be reliably prevented from protruding outside the window.

  1 and 2 show a configuration example in which a through-column-shaped inflatable portion is formed along the first side portion 33 and the second side-side portion 34, but the through-column-shaped inflatable portion is shown in FIG. As described above, it may be formed between the center pillar 8 and the first side portion 33 and between the center pillar 8 and the second side portion 34. In this case, the through-column-shaped expansion portion formed on the first side portion 33 side can be configured as a single column by extending the front seat expansion portion 14 downward. And the protrusion expansion | swelling part A 'formed in the lower end part of this through-column-like expansion | swelling part can be distribute | arranged to the state which overlapped with the trim part of the door provided with the side window 5 by the side of the front seat.

  Moreover, a pair of communicating portions 23b and 23d communicating with the lower end side of the front seat inflating portion 14 is used as a beam that intersects the front seat inflating portion 14 that is vertically long and inflated and deployed in a single column shape. Can do. That is, the lower end portion side of the front seat inflating portion 14 can be configured in a cross shape by the pair of communication portions 23b and 23d, and the lower end portion of the front seat inflating portion 14 is refracted by the trim portion of the door. Can be prevented.

  In addition, the through-column-shaped inflating portion formed on the second side portion 34 side extends the inflating portion 17a formed between the second side inflating portion 17 and the sub-inflating portion 16 downward, thereby It can be set as the structure made into the column shape. The protrusion inflating portion B 'formed at the lower end of the through-column-like inflating portion can be arranged in a state where it overlaps with the trim portion of the door provided with the side window 6 on the rear seat side.

In addition, the communication portion 23c can be configured as a beam that intersects the inflating portion 17a that is vertically long and inflated and expanded into a single columnar shape. That is, the lower end side of the inflating portion 17a can be configured in a lateral T shape by the communication portion 23c, and the lower end side of the inflating portion 17a is prevented from being refracted by the trim portion of the door. I can leave.
In the present invention, each through-column-shaped inflating portion shown in FIG. 3 and the first side inflating portion 13 and the second side inflating portion 17 shown in FIG.

  Also, as shown in FIGS. 4 and 5, the present invention can be suitably applied even when the curtain airbag 2 is provided in a single cabin only on the driver's seat side such as a pickup truck. The single cabin has a configuration in which a front window side window 5 provided on a door is disposed between a front window 35 and a rear window 36. Then, as shown in FIG. 4, the protrusion inflating portion C formed on the lower end portion of the through-column-like inflating portion 27 is arranged so as to overlap the trim portion of the door provided with the side window 5 on the front seat side. I can leave.

  Moreover, the communication portion 23e can be configured as a beam that intersects with the inflatable portion 27 that is vertically long and inflated and deployed in a single columnar shape. That is, the lower end portion side of the inflatable portion 27 can be configured in a lateral T shape by the communication portion 23e, and the lower end portion side of the inflatable portion 27 is prevented from being refracted by the door trim portion. I can leave.

  Further, as shown in FIG. 5, the projection inflating portion D formed at the lower end of the through-column-like inflating portion 28 is arranged so as to overlap the trim portion of the door provided with the side window 5 on the front seat side. be able to. The through-column-shaped inflatable portion 28 is formed between the inflatable portion 27 and the inflatable portion 29 which are the main inflatable portions of the curtain airbag 2.

  In addition, the pair of communication portions 23e and 23f can be used as a beam that intersects the through-column-shaped inflating portion 28 that is vertically long and inflated and deployed in a single column shape. That is, the lower end side of the through-column-shaped inflatable portion 28 can be configured in a cross shape by a pair of communication portions 23e and 23f, and the lower end side of the through-column-shaped inflatable portion 28 is refracted by the door trim portion. Can be prevented.

  In FIG. 6, the result of having performed the test about the case where the curtain airbag 2 of this invention is used and the case where the curtain airbag 60 as described in patent document 2 is used as a comparative example is shown. . In the test, each curtain airbag was inflated and deployed with the side window of the vehicle opened, and a test hard ball was collided with each curtain airbag inflated and deployed from the vehicle interior.

In this test, the horizontal axis shows the amount of hard ball falling when the hard ball collides with each curtain airbag as the stroke amount. The applied load is shown on the vertical axis. That is, a large value on the horizontal axis indicates that a large amount of the test hard ball comes out of the vehicle.
In FIG. 6, the result of the curtain airbag 2 according to the present invention is shown by a thick solid line, and the result of the curtain airbag used in the comparative example is shown by a thin solid line.

  As shown in FIG. 6, when the curtain airbag 2 according to the present invention is used, the curtain airbag 2 itself can be prevented from protruding outside the window. When is added, the hard ball falls to the position of S1, but the amount of fall of the hard ball does not increase as in the curtain airbag of the comparative example.

On the other hand, when the load F is applied to the curtain airbag of the comparative example, the hard ball falls to the position of S2, which is a stroke position larger than the position of S1. This is because the curtain airbag itself in the comparative example protrudes to the outside of the window, so that the amount of falling hard balls becomes a large value.
Thus, in the curtain airbag device 1 according to the present invention, even if an accident such as a side collision or a rollover occurs with respect to the vehicle, it is possible to avoid a situation in which an occupant is discharged outside the vehicle.

  The technical idea of the present invention can also be applied to other airbag configurations.

1 ... curtain airbag device,
2 ... curtain airbag,
8 ... Center pillar,
13 ... 1st side part expansion part,
14 ... front seat expansion part,
15 ... Pillar covering part,
17 ... 2nd side expansion part,
17a ... inflatable part,
23a to 23f ... communication part,
27-29 ... through-column-shaped inflatable part
30 ... Waistline,
41 ... pillar covering part,
42 ... lower inflatable part,
43 ... connecting line part,
49 ... Center pillar,
61 ... 1st main expansion part,
62 ... the second main expansion part,
63-67 ... 1st-5th sub expansion part,
68... First sub-deployment part,
69 ... the second sub-deployment part,
74 ... the fourth fracture portion,
75 ... the fifth fracture portion,
77 ... the lower edge of the window frame,
A, A ′, B, B ′, C, D...

Claims (1)

A curtain airbag that can be inflated and deployed along a window portion disposed on a side surface of the passenger compartment; and an inflator that supplies an inflation gas to the curtain airbag, wherein the inflated curtain airbag is provided in the window portion. In the curtain airbag device deployed so as to overlap the vertical frame,
The curtain airbag includes an upper side and a lower side, a first side connecting between one end of the upper side and the lower side, and a second side connecting between the other end of the upper side and the lower side. And a side,
The lower side portion has a protrusion inflating portion that extends downward beyond the waist line drawn by the lower end of the window portion ,
The protrusion inflating portion is configured as a lower end portion of a through columnar inflating portion continuous from the main inflating portion of the curtain airbag covering the window,
A communication portion for introducing the expansion gas is connected to a lower end portion side of the through-column-shaped expansion portion, and the communication portion intersects the through-column-shaped expansion portion and extends from the first side edge portion to the center pillar. Or the curtain airbag apparatus characterized by extending to a rear pier and comprising a beam .

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