JP5131982B2 - Air bag and air bag device - Google Patents

Description

  The present invention relates to, for example, an airbag and an airbag device that are deployed along a window on a side portion of an automobile.

  2. Description of the Related Art Conventionally, an airbag apparatus having an airbag that inflates and deploys by introducing gas is known as a so-called curtain airbag apparatus that deploys an airbag along a window of a door on the side of a vehicle compartment. Yes. The airbag of such an airbag apparatus, that is, a curtain airbag is normally folded in an elongated shape and arranged along the upper edge of the window. When an impact such as a side collision or rollover (rollover) is received, gas is supplied from the inflator, and the curtain airbag deploys downward from the upper side along the side window, etc., restraining the occupant And protect.

  In such a curtain airbag, a sub chamber is provided further forward of the main inflating portion of the front protection area for protecting the front seat occupant, and the main inflating portion and the sub chamber are connected via a vent hole provided in the lower portion. A communication configuration is known (for example, see Patent Document 1). In this configuration, when the gas supplied from the inflator is supplied to the main inflating portion, the curtain airbag is deployed at a predetermined position in a predetermined shape, and the occupant's head that moves sideways, etc. Restrain and protect. And when a passenger | crew head contacts a main expansion part, the gas of a main expansion part moves to a subchamber via a vent hole, and can suppress the force added to a passenger | crew. Further, since the gas in the main inflating portion is not exhausted to the outside of the curtain airbag but is retained in the sub chamber in the curtain airbag, the internal pressure can be maintained for a relatively long time to protect the occupant.

  However, in the configuration of this Patent Document 1, the partition line that divides the main expansion portion and the sub chamber is provided in a straight line perpendicular to the vertical direction, so to speak, the sub chamber along the front end portion of the main expansion portion. Are provided parallel to the vertical direction. Therefore, when the occupant comes into contact with the curtain airbag, it is necessary to provide a member that prevents shaking so that the curtain airbag does not swing in the vehicle width direction so as to bend along the lane marking. There is a problem that it is not easy to reduce.

  Further, in the curtain airbag, a configuration is known in which a sub-inflation portion is provided on the front side of the main inflation portion, and the main inflation portion and the sub-inflation portion are communicated with each other via a reduced diameter portion provided below (for example, (See Patent Document 2).

However, in the configuration of Patent Document 2, the partition line that divides the main inflatable portion and the sub-inflatable portion has an inclined linear shape, and ensures a region of the main inflatable portion that is in direct contact with the occupant and restrains it. For this purpose, it is necessary to increase the capacity of the main inflating portion, and the partition line that divides the main inflating portion and the sub inflating portion has an inclined linear shape, so to speak, along the front end portion of the main inflating portion. Since the inflating parts are provided in parallel, it is necessary to provide a member to prevent the curtain airbag from shaking in the vehicle width direction, and it is not easy to reduce the manufacturing cost. Yes.
Japanese Patent Laying-Open No. 2004-34766 (page 4, FIG. 7) JP 2007-161163 (page 4-5, FIG. 3)

  In the configuration in which the sub-inflation portion is provided in the airbag as in the conventional case, a configuration that can easily reduce the manufacturing cost while ensuring the necessary restraining performance is required.

  This invention is made | formed in view of such a point, and it aims at providing the airbag and airbag apparatus which can reduce a manufacturing cost easily while being provided with a subinflation part.

The airbag according to claim 1 is an airbag that is introduced into a plane along a predetermined plane when gas is introduced, and restrains and protects the object to be protected. a main expansion portion which to expand, this in the main expansion portion and the sub-expansion unit which gas is supplied, communicates the these main expanding portion and the sub-expansion unit to generate a predetermined flow resistance, wherein the secondary expansion A communication part that functions as an internal exhaust receiving part, a first dividing line part that divides the main expansion part and the sub expansion part and extends linearly upward from the communication part, and the first dividing line continuous to the upper end parts, and a division line having a second division line portion arranged to extend from on the first extension of the division line portion in the main expanding portion, the sub The expansion part communicates with a lower sub-expansion part along the first partition line part and an upper side of the lower sub-expansion part. Along the partition line of 2 in which and an upper sub-expansion unit.

In this configuration, when gas is introduced into the airbag, the main inflating portion is deployed to face the object to be protected, thereby protecting the object to be protected. Since the main expansion part is partitioned by the sub-expansion part and the partition line, the gas is effectively used, and the main expansion part is rapidly deployed. When the object to be protected comes into contact with the main expansion part, the gas moves from the main expansion part to the sub-expansion part via the communication part that generates a predetermined ventilation resistance, and the force applied to the object to be protected is suppressed, and relatively The internal pressure is maintained for a long time, and the protected object is protected. Since the lane marking includes a first lane marking that extends linearly upward from the communication portion , it is easy to secure a region where the main expansion portion faces the object to be protected. Further, the lane marking is provided with a second lane marking portion that is continuous with the upper end portion of the first lane marking portion and that extends from the extension line of the first lane marking portion toward the main expansion portion. , sub expanded portion, because is partitioned into a first division line portion lower sub inflatable portion along the along the second partition line portion communicating with the upper side of the lower auxiliary inflatable portion upper secondary inflatable portion, partition lines Compared with a configuration in which the entire airbag is straight, the deployed airbag is restrained from swaying so as to bend at the part of the lane marking, and the deployed airbag is easily stabilized.

The airbag according to claim 2 is the airbag according to claim 1, wherein the airbag is deployed along a side portion of the passenger compartment as a predetermined surface, and the main inflating portion is a seated occupant as a protected object it is intended to expand opposite the lateral.

And in this structure, about the airbag developed along the side part of a compartment, the field where a main inflating part counters a crew member is secured easily, and a crew member is restrained and the power at the time of a crew member contacting an airbag is controlled. Is protected, and the behavior of the airbag swinging in the vehicle width direction is suppressed, so that the airbag is easily stabilized.

  According to a third aspect of the present invention, there is provided an airbag apparatus comprising the airbag according to the first or second aspect and an inflator for supplying gas to the airbag, wherein the predetermined surface is a surface along a side portion of the vehicle compartment. The airbag is folded and stored in a storage position along the upper edge of the predetermined surface, and gas is introduced to expand downward.

  In this configuration, the airbag is deployed along the side of the passenger compartment, and the region where the main inflating portion faces the occupant is easily secured, and the occupant is restrained from the force when the occupant contacts the airbag. Thus, an airbag device is provided in which the airbag is prevented from shaking and the airbag is easily stabilized.

According to the present invention, the main expansion part is partitioned by the sub-expansion part and the partition line, so that the gas is effectively used and the main expansion part can be rapidly deployed. When the object to be protected comes into contact with the main expansion part, the gas moves from the main expansion part to the sub-expansion part through the communication part that generates a predetermined airflow resistance, and the force applied to the object to be protected can be suppressed and relatively long. The object to be protected can be protected by maintaining the internal pressure over time. Since the lane marking includes the first lane marking that extends linearly upward from the communication portion, it is possible to easily secure a region where the main expansion portion faces the object to be protected. Further, the lane marking is provided with a second lane marking portion that is continuous with the upper end portion of the first lane marking portion and that extends from the extension line of the first lane marking portion toward the main expansion portion. , sub expanded portion, because is partitioned into a first division line portion lower sub inflatable portion along the along the second partition line portion communicating with the upper side of the lower auxiliary inflatable portion upper secondary inflatable portion, partition lines Compared with the configuration in which the entire airbag is straight, the behavior of the deployed airbag swinging so as to be bent at the parting line portion can be suppressed, and the deployed airbag can be easily stabilized.

  Hereinafter, an embodiment of an airbag and an airbag device of the present invention will be described with reference to the drawings.

  In FIG. 1 to FIG. 6, reference numeral 1 denotes an airbag, and an airbag device 2 including the airbag 1 is also called a curtain airbag device, and serves as a storage position of a compartment of a vehicle body 3 of an automobile that is a vehicle. It is arranged on the roof side part 5. The airbag 1 is also called a curtain airbag, a side-impact airbag, an inflatable curtain, or a head protection airbag. The airbag 1 is subjected to a side collision impact or rollover. For example, it is developed in a substantially planar shape on the side of the occupant as the object to be protected to protect the occupant.

  In the following description, the front-rear direction, the vehicle width direction, the both-side direction, the up-down direction, and the like are based on the straight-advancing direction of the vehicle, and the front direction (arrow F direction shown in FIG. 1) and the upper direction (arrow U shown in FIG. 1). Direction), outward direction (arrow W direction shown in FIG. 3), and the like. In FIGS. 4 and 5, A is a head position (AM50) in a normal sitting position of an average American male adult imitating a relatively large occupant, and B is relatively small. This is the position of the head of a dummy (AF05) that leans on the relatively front side of a small American adult woman who imitates an occupant.

  The vehicle body 3 includes a front seat and a rear seat in which a passenger can sit in the vehicle interior, and forms a predetermined surface as an opening that can be opened at the top corresponding to the front seat and the rear seat. The door (not shown) provided with the window part (side window) 8 to perform is provided. Further, on both sides of the passenger compartment, a front pillar 11 called A pillar, a center pillar (not shown) called B pillar, and a rear pillar 13 called C pillar are provided in order from the front side (left side in FIG. 1). The window 8, the door, and the pillars 11 and 13 form a predetermined surface 14 on both sides of the passenger compartment. Further, a vehicle body panel constituting a member to be attached, which is also called a roof side rail, is provided on the upper side of the pillars 11 and 13, that is, the upper edge portion that is one edge portion of the window portion 8, and the ceiling is interposed through the vehicle body panel. The ceiling panel as a part is supported. A front glass (front windshield) is provided on the front side of the front pillars 11 on both sides, and a rear glass is provided on the rear side of the rear pillars 13 on both sides. And the roof side part 5 as a storage position is set from the edge part of the both sides of a ceiling panel to the part concerning the full length of the front pillar 11 and the rear pillar 13 extended in the direction which intersects with this edge part. A predetermined surface 14 on which the airbag 1 is deployed is set inside an arc virtually formed by the edge portion of the ceiling panel, the front pillar 11 and the rear pillar 13.

  Here, the center pillar 12 is not a pillar at the front and rear ends but a pillar covered by the deployed airbag 1. Depending on the type of vehicle, for example, four or more pillars may be provided on one side, but the third and subsequent pillars from the front will be described as the rear pillar 13.

  The airbag device 2 is a so-called front and rear seat airbag that can protect passengers in the front and rear seats, and is a roof side portion 5 surrounded by a vehicle body panel and a head lining, that is, a door opening portion of the vehicle body 3. The airbag 1 is stored in an elongated shape along the upper edge, and an inflator 25 that is stored behind or above the rear seat and supplies gas to the airbag 1. In addition, the airbag device 2 is attached along a mounting bracket formed by pressing a metal plate that attaches the airbag 1 to the vehicle body panel, or the folded airbag 1 as necessary. A protector made of resin for protecting the bag 1, a sleeve as a breakable cylindrical or string-shaped holding member for holding the shape of the folded airbag 1, a tether belt 29 connected to the front end of the airbag 1, etc. Is provided.

  The airbag 1 is a combination of a single base fabric or a plurality of base fabrics. For example, an airbag main body formed in a flat bag shape by folding back one base fabric or stacking and joining two base fabrics. 31 and an attachment piece portion 32 constituting an attachment portion extending from a plurality of locations of the airbag main body portion 31 and the like, and is folded into an elongated shape and stored in the roof side portion 5.

  The airbag main body 31 overlaps an inner base fabric portion 33 disposed on the vehicle interior side with an outer base fabric portion 34 disposed on the outer side which is the vehicle body side, and a predetermined sewing portion which is a joint portion. The bag-like inflatable portion 35 that inflates and expands when gas flows in, the gas introduction portion 36 that communicates with the inflatable portion 35 located outside the upper portion of the airbag main body 31 and the like, and gas flows in A non-expandable portion 37 that does not expand and expand is provided.

  The inflating portion 35 is an air chamber that is a hollow portion, and includes a gas guiding portion 40, a first main inflating portion 41 as a main inflating portion, a second main inflating portion 42, and a first inflating portion as a sub inflating portion. A sub-expansion part 44, a second sub-expansion part 45, and a third sub-expansion part 46 are provided.

  The gas guide portion 40 communicates directly with the gas introduction portion 36, and is provided in a straight line along the upper edge portion of the airbag body portion 31 with the front-rear direction as the longitudinal direction. It develops into a substantially horizontal columnar shape as a certain axial direction. In the present embodiment, the gas guide portion 40 is not formed at the front end portion of the airbag main body portion 31, and the gas introduction portion 36 communicates with the rear end portion.

  The first main expansion part 41 is a front seat protection part that communicates with the front side, which is the downstream side of the gas guide part 40, and that develops facing the side of the front seat occupant during deployment. The second main expansion portion 42 is a rear seat protection portion that communicates with the rear side, which is the upstream side of the gas guide portion 40, and that develops facing the occupant side of the rear seat when deployed.

  Further, the first sub-inflating portion 44 communicates with the front side of the first main inflating portion 41 via the first vent hole 51 as a communicating portion, and further forwards from the side of the front seat occupant during deployment. It is located and can be deployed. The second sub-inflating portion 45 communicates with the rear side of the first main inflating portion 41 through the second vent hole 52 and is deployed rearward from the side of the front seat occupant during deployment. It is possible. Further, the third sub-inflatable portion 46 communicates with the front side of the second main inflatable portion 42 through the third vent hole 53, and can be deployed forward from the side of the rear seat occupant during deployment. It has become.

  Further, the sewing portion is configured to be substantially airtight or highly airtight by sewing, bonding, or a combination of sewing and sealing means, and an outer periphery sewing portion 55 that is an outer periphery connecting portion for sewing the outer periphery of the inflating portion 35. A regulating portion 56 that is located in a region surrounded by the outer circumferential sewing portion 55 and that defines the main inflating portions 41, 42 and the sub inflating portions 44, 45, 46, etc., and regulates the width of each portion when deployed; I have. The restricting portion 56 is formed integrally with or separately from the outer peripheral sewing portion 55, and is formed in an annular shape that protects the line portion 57 located at the end of the line portion 57 and the line portion 57. A protection part 58 is formed.

  In the present embodiment, the line portion 57 of the restricting portion 56 is located on the front side of the first main expansion portion 41 and divides the first main expansion portion 41 and the first sub expansion portion 44. A first partition line 61 as a partition line, and a second partition that is located on the rear side of the first main expansion portion 41 and partitions the first main expansion portion 41 and the second sub-expansion portion 45 The line 62 and the second main expansion portion 42 are located below the gas guide portion 40 from the front side of the second main expansion portion 42, and the second main expansion portion 42, the gas guide portion 40, and the third sub expansion portion 46 are partitioned. 3 lane markings 63. Further, as the line portion 57 of the restricting portion 56, a fourth partition line 64 that branches from the first partition line 61 and extends so as to bend inside the first main expansion portion 41, and a second partition line 62 are provided. And a fifth partition line 65 extending from the first main expansion portion 41 so as to bend inside.

  The first lane marking 61 includes a first lane marking 71 and a second lane marking 72 that is continuous with the first lane marking 71. The first partition line portion 71 is arranged in a vertical straight line along the up-down direction, and the first partitioning line portion 71 is configured to allow gas to flow between one end 71a as a lower end and the outer peripheral sewing portion 55 facing downward. It is a vent hole 51. That is, the first vent hole 51 is located at one end of the first lane marking 71 of the first lane marking 61 on the one end 71a side. Then, from the other end 71b which is the upper end portion of the first dividing line portion 71 extending upward from the first vent hole 51, the second dividing line portion 72 is an extension line of the first dividing line portion 71. It is inclined and extended upward and rearward so as to bend rearward from above 71c, that is, toward the first main expansion portion 41 side. That is, the second lane line portion 72 is disposed at a position different from the extension line 71c of the first lane line portion 71, and the extension line 71c of the first lane line portion 71 intersects with the outer peripheral sewing portion 55. The outer circumferential sewing portion 55 is continued at a position different from the position.

  Further, in this way, the first sub-inflatable portion 44 is defined by being partitioned by the first partition line 61, the outer periphery sewing portion 55, and the first vent hole 51. In the present embodiment, the outer peripheral sewing portion 55 is formed so that the lower portion is a straight line that is substantially parallel to the first partition line 61 and the upper portion is inclined toward the upper rear. The first sub-expansion portion 44 includes a lower sub-expansion portion 44a along the first partition line portion 71 and an upper portion along the second partition line portion 72 in communication with the upper side of the lower sub-expansion portion 44a. And a sub-expansion part 44b. Therefore, the lower sub-expansion portion 44a is disposed along the front side portion of the first main expansion portion 41, and the upper sub-expansion portion 44b is disposed along the upper portion of the front side portion of the first main expansion portion 41. ing.

  The second partition line 62 is formed so as to extend downward from the distal end side of the gas guide portion 40, that is, the distal end side of the third partition line 63, and the lower end portion that is the distal end portion of the second partition line 62. A second vent hole 52 is formed between the outer peripheral sewing portion 55 and the outer peripheral sewing portion 55. The fifth partition line 65 is formed so as to extend from the lower end portion, which is the tip portion of the second partition line 62, to the front side and to be curved further upward.

  Further, the third dividing line 63 has a lower end that is a lower end of a portion extending in the front-rear direction along the lower side of the gas guide portion 40 and extending downward. A third vent hole 53 is formed between the portion and the outer peripheral sewing portion 55.

  Although each vent hole 51, 52, 53 is always open, it has a small opening area and opens in a slit shape to generate a predetermined ventilation resistance, and communicates with each vent hole 51, 52, 53. The sub-expanding portions 44, 45, and 46 function as internal exhaust receiving portions (internal vents). Further, the positions of the vent holes 51, 52, 53 are formed at the lower end portions that are the downstream end portions of the main expansion portions 41, 42. Therefore, at the initial stage of deployment when the gas is introduced from the gas introduction part 36 to the main expansion parts 41 and 42 via the gas guide part 40 and the main expansion parts 41 and 42 are deployed, the sub-expansion parts 44, 45 and 46. No gas is introduced at all or almost.

  In addition, between the inner base fabric portion and the outer base fabric portion, the base fabric is formed in a cylindrical shape as a means for guiding gas or regulating the width of the expansion portion when deployed, as necessary. The inner pipe 77 and the partition body, which is a base fabric that connects the inner base fabric portion 33 and the outer base fabric portion 34, are attached by sewing or the like. Further, in this embodiment, a slight non-inflatable portion 37 is formed at each of the front end portion of the upper end portion and the lower end portion of the rear end portion of the airbag body portion 31, and the front non-inflatable portion 37 is attached to the vehicle body. A fixed point 79 is formed.

  The mounting piece 32 of the airbag 1 is a mounting piece for mounting the vehicle body, and a plurality of mounting pieces 32 are formed at predetermined positions on the upper edge of the airbag body 31. Each attachment piece 32 is formed integrally with the base fabric portion constituting the airbag main body 31, and is formed, for example, by overlapping and sewing the inner base fabric portion 33 and the outer base fabric portion 34. ing. Each attachment piece 32 protrudes from the airbag body 31 in a tongue-like shape, and an attachment hole 32a having a circular hole shape is formed.

  Next, the assembly process of this airbag apparatus 2 and the attachment process to the vehicle body 3 are demonstrated.

  First, in the airbag 1, the airbag main body 31 is folded into a predetermined elongated shape from a state where the inner base fabric portion 33 and the outer base fabric portion 34 are overlapped and spread in a planar shape, and a sleeve or the like is used. While maintaining the folded shape, the protector and the mounting bracket are attached, and the connecting pipe extending from the cylindrical main body portion of the inflator 25 is connected to the gas introducing portion 36 at the rear end. The airbag body 31 can be folded in various ways. For example, as shown in FIG. 4, the lower portion is folded into a roll shape to form the stacking portion 81, and the upper portion The part can be folded as a parasol-shaped guide part 82 that wraps the stacking part 81 from the upper part to both side parts. In this embodiment, the stacking unit 81 is wound so as to wind up the airbag main body 31 from the lower end to the outside, that is, to the predetermined surface 14 side. Further, the guide part 82 is a part including the gas guide part 40, and is configured by folding the upper side part so that the fold line faces the vehicle compartment side and folding the lower side part so that the fold line faces the vehicle outer side. Yes.

  Then, the airbag device (curtain airbag module) 2 is brought into the vehicle interior, and the attachment work to the vehicle body 3 is performed before the interior members such as the head lining and the pillar garnish are attached. This mounting operation is performed by fixing the plurality of mounting pieces 32, the fixing points 79, the tether belt 29, the mounting portions provided on the inflator 25, and the mounting bracket of the airbag 1 to the vehicle body with fixing devices such as bolts. Is called. Further, the harness led out from the inflator 25 is connected to a control device provided in the vehicle body 3. Next, the head lining is attached to the ceiling panel of the vehicle body 3, the pillar garnish is attached to each pillar 11, 13 to cover the airbag device 2, thereby completing the operation of attaching the airbag device 2 to the vehicle body 3.

  Next, the deployment operation of the airbag 1 will be described.

  In the event of a side collision or rollover of the vehicle, the inflator 25 is actuated by the control device, and the gas injected from the inflator 25 passes from the gas introduction part 36 to the inflating part 35 in the airbag main body part 31 via the connecting pipe. be introduced. Then, in the inflating portion 35 of the airbag main body 31, first, the guide portion 82 is inflated and deployed to push the head lining and the front and rear pillar garnishes, and then the accumulation portion 81 is a predetermined surface 14 which is the inner surface of the side portion of the vehicle compartment. The window 8 and the center pillar are covered by rapidly expanding and deploying in a curtain shape substantially downward in a predetermined direction along the predetermined surface 14 so as to be rewound while being rubbed.

  At this time, in the expansion portion 35, the gas guide portion 40 rapidly expands from the rear end portion to the front end portion, and gas is supplied from the gas guide portion 40 to the first main expansion portion 41 and the second main expansion portion 42. The main inflating portions 41 and 42 are quickly deployed in the region facing the side of the seating position of the front and rear seat occupants to protect the occupants. In particular, the first dividing line portion 71 located below the first dividing line 61 is a vertical straight line, and the second dividing line portion 72 is inclined upward and rearward from the upper end of the first dividing line portion 71. As shown in FIG. 5, for the large passenger (A) located on the rear side with the seat positioned relatively rearward, a wide protection area is secured in the vertical direction, as shown in FIG. For small occupants (B) located on the front side, such as by placing a seat on or leaning forward, secure a protective area on the lower side, and make effective use of gas while ensuring the necessary protective area ing.

  Then, in a state where the deployment of the main inflating portions 41 and 42 is completed and before the occupant comes into contact with the airbag 1, the pressure of the gas supplied from the inflator 25 and the vent holes 51, 52 and 53 Due to the relationship between the position and the ventilation resistance, gas does not flow into each of the sub-expansion parts 44, 45, 46, and the flat state remains flat.

  When an occupant thrown out to the side comes into contact with the airbag 1 and the internal pressure of one or both of the main inflating portions 41 and 42 increases, the gas is passed through the vent holes 51, 52, and 53. The force that is applied to the occupant from the airbag 1 is reduced by flowing into the sub-inflatable portions 44, 45, and 46 and expanding to the maximum volume. Each of the sub-inflating portions 44, 45, 46 is deployed at a position deviating from the normal seating position of the occupant.

  Further, when the first sub-expansion portion 44 is inflated and deployed, the first sub-expansion portion 44 is inflated and deployed in a column shape bent at the intermediate portion along the first partition line 61, and the first main inflatable portion 41 is expanded. In this manner, the deployment shape of the airbag main body 31 of the airbag 1 is firmly held, and the shaking of the airbag 1 in contact with the occupant is suppressed.

  Further, even if the gas moves from the main inflatable portions 41 and 42 to the sub inflatable portions 44, 45, and 46 through the vent holes 51, 52, and 53, the gas is outside the inflatable portion 35 of the airbag 1. Since it is not released, the airbag 1 maintains the deployed shape for a relatively long time.

  As described above, according to the curtain airbag device of the present embodiment, by introducing gas into the airbag 1, the main inflating portions 41 and 42 are arranged along the predetermined surface 14 on the side of the passenger compartment. It can be deployed in the required area facing the side to protect the head of the passenger.

  The inflatable portion 35 of the airbag 1 is provided with first to third sub-inflatable portions 44, 45, 46 in addition to the first and second main inflatable portions 41, 42. Since the inflating portions 41 and 42 and the first to third auxiliary inflating portions 44, 45 and 46 are partitioned by the first to third partition lines 61, 62 and 63, an occupant is placed in the airbag 1. At the initial stage of deployment before contact, gas does not flow into each of the sub-expansion parts 44, 45, 46, and the gas supplied from the inflator 25 is effectively used to quickly move the main expansion parts 41, 42 to predetermined positions. Can be deployed. In addition, since the gas supplied from the inflator 25 can be used effectively, the inflator 25 can be downsized.

  When the occupant comes into contact with the main inflating portions 41 and 42 of the inflating portion 35 of the deployed airbag 1, the gas moves to the sub inflating portions 44, 45 and 46 through the vent holes 51, 52 and 53. The force applied to the occupant from the airbag 1 can be suppressed and the occupant can be protected.

  Further, even if the gas moves from the main inflatable portions 41 and 42 to the sub inflatable portions 44, 45 and 46 through the vent holes 51, 52 and 53, the gas is outside the inflatable portion 35 of the airbag 1. Since the airbag 1 is not released, the airbag 1 maintains the internal pressure, that is, the deployed shape for a relatively long time, and can effectively protect the occupant even during rollover (during rollover).

  Further, when the first sub-expansion portion 44 is inflated and deployed, the first sub-expansion portion 44 is inflated and deployed in a column shape bent at the intermediate portion along the first partition line 61, and the first main inflatable portion 41 is expanded. Thus, the position and the deployed shape of the airbag main body 31 of the airbag 1 can be firmly held. Therefore, the behavior of the airbag 1 swinging in the vehicle width direction when the head of the occupant comes into contact with the first main inflating portion 41 at the time of a side collision of the vehicle is suppressed, and the airbag 1 is easily stabilized. Can be protected. For this reason, it is not necessary to use a separate member for stabilizing the airbag 1, and the manufacturing cost of the airbag device 2 can be reduced.

  Further, with respect to the first division line 61 that divides the first main expansion portion 41 and the first sub-expansion portion 44, the first division line portion 71 located below the first division line 61 is vertical. Since the second lane line portion 72 extending from the upper end of the first lane line portion 71 is inclined and extends rearward, the large occupant positioned relatively on the rear side and the The volume of the first main expansion portion 41 that expands in the initial stage of deployment can be suppressed and gas can be used effectively while easily securing a necessary protection area that can sufficiently protect a small passenger located on the front side.

  In addition, the shock absorption characteristic that suppresses the force applied to the occupant from the airbag 1 by the movement of the gas through the vent holes 51, 52, and 53 to the sub-inflatable portions 44, 45, and 46 is that each vent hole. By adjusting the dimensions of 51, 52 and 53, it can be easily changed greatly.

  In the above-described embodiment, with respect to the first partition line 61, the first partition line portion 71 located below is a straight straight line, and extends from the upper end of the first partition line portion 71. The partition line portion 72 has a shape that inclines toward the rear, but is not limited to this shape. For example, as shown in FIG. 6, the first lane line portion 71 located at the lower part is formed in a vertical straight line, and the second lane line portion 72 extending from the upper end of the first lane line portion 71 is Alternatively, the first stepped portion 72a extending horizontally to the side and the second stepped portion 72b extending vertically upward from the rear end portion of the first stepped portion 72a may be combined to form a stepped shape. Further, the second partition line portion 72 may be curved.

  Further, with respect to the first dividing line 61, the lower end portion, that is, the tip end portion is formed to a position intersecting with the outer peripheral sewing portion 55, and the outer peripheral sewing portion 55, that is, a position slightly separated from the lower end portion of the first main expansion portion 41. In addition, the first vent hole 51 as a communication portion can be provided to be opened.

  In the above embodiment, each vent hole 51, 52, 53 as the communication portion is not configured to completely shut off the gas flow, but is configured to communicate so as to be always openable, but is not limited thereto. Further, it can be closed by a breakable member that can be broken by the pressure of gas at the time of contact of the occupant.

  Further, the inflating portion 35, the gas introducing portion 36, the non-inflating portion 37, the front end portion of the outer peripheral sewing portion 55, and the like of the airbag 1 can be appropriately arranged. For example, the gas introducing portion 36 includes an air The bag main body 31 may be positioned at the center upper portion in the front-rear direction. Moreover, the gas guide part 40 can also be formed along the substantially full length of the upper edge part of the airbag main-body part 31, for example.

  Further, the airbag 1 is not limited to a configuration in which the airbag 1 is deployed from the upper side to the lower side and covers the window 8 on the side of the automobile, and an appropriate airbag that needs to be inflated and deployed in a planar shape along a predetermined surface. Applicable to equipment.

  The present invention can be applied to, for example, an airbag and an airbag device called a curtain airbag that are deployed along a side window of an automobile.

It is explanatory drawing of the state which has arrange | positioned the airbag apparatus which shows one Embodiment of the airbag and airbag apparatus of this invention in a vehicle. It is explanatory drawing of the state which unfolded the airbag of the airbag apparatus same as the above in planar shape. It is sectional drawing of the II equivalent position of FIG. 1 of an airbag apparatus same as the above. It is explanatory drawing of the folding shape of an airbag same as the above. It is explanatory drawing which shows operation | movement of an airbag apparatus same as the above. It is explanatory drawing which shows operation | movement of other embodiment of the airbag apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air bag 2 Air bag apparatus 5 Roof side part as storage position
14 Predetermined surface
25 inflator
41 1st main expansion part as main expansion part
44 1st subexpansion part as a subexpansion part which functions as an internal exhaust receiving part
44a Lower secondary expansion part
44b Upper secondary expansion part
51 1st vent hole as communication part
61 First lane marking as lane marking
71 first division line portion
71c extension line
72 Second lane marking

Claims (3)

An air bag that is introduced into a gas along a predetermined surface and is constrained to protect an object to be protected,
A main inflating part that is introduced into the gas and expands against the object to be protected;
A sub-expansion part to which gas is supplied from the main expansion part;
Communicating with the main expansion part and the sub-expansion part so as to generate a predetermined ventilation resistance, and a communication part for causing the sub-expansion part to function as an internal exhaust receiving part ;
The main expansion part and the sub-expansion part are partitioned, the first partition line part extending linearly upward from the communication part, and the upper end part of the first partition line part, and the first partition line part. and a second division line portion from the extension line of a lane mark of being arranged extending in the main expanding portion and the partition lines provided with,
The secondary expansion part is
A lower sub-expansion portion along the first partition line portion;
An airbag comprising: an upper sub-inflation portion that communicates with an upper side of the lower sub-inflation portion and extends along the second partition line portion . Airbag expands along the side of the passenger compartment as a predetermined plane, the main expansion portion, claim 1, wherein the deploying opposite to the side of the seated occupant of the article to be protected Air bag. An airbag according to claim 1 or 2, and
An inflator for supplying gas to the airbag,
The predetermined surface is a surface along the side of the passenger compartment,
The airbag device is folded and stored in a storage position along an upper edge portion of the predetermined surface, and introduced with gas, and is deployed downward.

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