JP5361065B2 - Airbag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To flatly deploy a curtain airbag, and to ensure an impact-absorbing stroke. <P>SOLUTION: An airbag 1 is flatly deployed by restricting a thickness dimension by a connection part 40 obtained by sewing base clothes 31, 32 each other and directly connecting them. A tack part 42 is formed by folding one base cloth 32 on the connection part 40. In the tack part 42, upper and lower end parts are integrally sewn on an outer peripheral sewing part 34. At deployment of the airbag 1, the impact-absorbing stroke on a portion of the connection part 40 is ensured by an inflated tack part 42, and impact-absorbing characteristic on an entire protection area is enhanced. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an airbag that is deployed along, for example, a window portion on a side portion of a vehicle cabin.

  2. Description of the Related Art Conventionally, as an airbag apparatus having an airbag that inflates and deploys by introducing gas, a so-called curtain airbag apparatus that deploys an airbag along a side window of an automobile compartment to protect an occupant is known. It has been. And the airbag of this airbag apparatus is normally folded long and is accommodated along the roof side part of the upper part of the window part of a vehicle interior part. The airbag is supplied with gas from the inflator when the automobile receives a side impact such as a side collision, and is inflated and deployed flat along the side door window or B pillar. In addition, the head of the passenger is protected.

  Further, in order to deploy this airbag in a flat surface shape along the side of the passenger compartment, for example, the outer peripheral portion of two base fabrics is connected, and a deployment portion that expands when gas is introduced, is formed. The base fabrics are connected to each other at a predetermined position on the inner side of the expanded portion by a connecting portion by sewing or integral weaving, and the thickness dimension of the air layer at the time of expansion, that is, the shock absorbing stroke is defined (for example, see Patent Document 1). ).

  However, in this configuration, since there is no thickness dimension at the time of deployment at the position of the connecting portion, it is not easy to appropriately adjust the shock absorption characteristics at each position of the protection region of the airbag.

  In this respect, a base fabric having air permeability is placed between the base fabrics constituting the outer shell of the airbag, and the base fabric having air permeability is connected to one base fabric constituting the outer shell. There are known a configuration in which the tethers are connected, and a configuration in which tethers are provided to connect the base fabrics constituting the outer shell with a breathable base fabric (for example, see Patent Document 2).

  However, in this way, in the configuration in which the base fabric having air permeability is placed between the base fabrics constituting the outer shell, three base fabrics are stacked on almost the entire surface of the airbag, As the amount of use of the base fabric increases, it becomes difficult to fold it small. Moreover, in the structure which provides a tether inside an airbag, the manufacturing process by sewing becomes complicated and the manufacturing cost increases.

  In addition, two base fabrics having a size twice as large as that required for an airbag are overlapped to connect the outer peripheral portion, and a connecting portion is formed. Then, the connecting portion does not overlap each other in the vertical direction or A configuration that is folded at the center in the longitudinal direction is known (for example, see Patent Document 3).

  However, with this configuration, four base fabrics are overlaid on almost the entire surface of the airbag, and the amount of base fabric used increases and it becomes difficult to fold it small. Further, in order to ensure a smooth gas flow at the folded portion, the configuration becomes complicated and the manufacturing cost increases.

  In addition, by applying so-called one-piece weaving (jacquard weaving), a three-layer base fabric and a connecting portion connecting these base fabrics are integrally woven throughout the protection area of the airbag, and the inflated portion is arranged in a complementary manner. Is known (see, for example, Patent Document 4).

  However, this configuration requires a sophisticated and complicated apparatus and technology in manufacturing, and increases the manufacturing cost.

JP 2004-1712 A (Fig. 1-2) Japanese Patent Laying-Open No. 2004-210257 (FIG. 1-2) Japanese Patent Laying-Open No. 2005-271755 (FIG. 3-5) Japanese Patent Laying-Open No. 2004-268880 (FIG. 4)

  As described above, the conventional configuration for improving the impact absorption characteristics at the portion where the base fabrics are connected to each other has a problem that the manufacturing cost increases.

  This invention is made in view of such a point, and it aims at providing the airbag which can improve the shock absorption characteristic in the part which connected the base fabric parts easily.

The airbag according to claim 1 is an airbag in which gas is introduced from a folded state and is inflated and deployed in a flat manner along a predetermined surface, and includes a first base fabric portion and the first base fabric portion. A second base fabric portion arranged in an overlapping manner, an outer peripheral connection portion that joins the first base fabric portion and the second base fabric portion, and defines an expansion portion into which gas is introduced inside; The thickness dimension of the air layer when the expansion portion is deployed by directly connecting the first base fabric portion and the second base fabric portion at the expansion portion defined by the outer peripheral connection portion. A connecting portion that regulates and a portion of the base fabric portion that is located in the inflating portion is folded outwardly of the inflating portion to cover the connecting portion that is located in the inflating portion and gas from the inflating portion. The tack part to be introduced and the base cloth part are connected to each other by a part of the tack part, and the shape of the tack part is It is intended to and a tack retaining portion for lifting.

  The airbag according to claim 2 is the airbag according to claim 1, wherein the connecting portion has a linear shape, and the tack portion has a first fold line that is close to the connecting portion and parallel to the connecting portion, and The base fabric portion is formed by folding back the second fold line parallel to the first fold line, and the tack holding portion is constituted by an outer peripheral connection portion.

  The airbag according to claim 3 is the airbag according to claim 1 or 2, wherein the tack portion is provided only on the base fabric portion located on the side of the object to be protected.

  According to a fourth aspect of the present invention, in the airbag according to the first or second aspect, the tack portion is provided only on the base fabric portion positioned on the protected object side.

  The airbag according to claim 5 is the airbag according to claim 1 or 2, wherein the tack portions are alternately provided on the first base fabric portion and the second base fabric portion.

According to the airbag of the first aspect, the airbag is inflated and deployed along the predetermined surface to protect the object to be protected. As for the expansion part into which gas is introduced inside, the thickness dimension as a whole is regulated by the connecting part, and a shape that develops flat is realized. When the inflating part is inflated, the tack part is inflated so as to cover the connecting part located in the inflating part defined by the outer peripheral connecting part, so that the shock absorbing characteristic at the connecting part can be improved. The tack part can be formed by folding the base cloth part outward of the inflating part and holding the shape by the tack holding part, and the structure is simple and the manufacturing cost can be reduced. The tack portion only needs to be formed in the vicinity of the connecting portion, and compared to a configuration in which the entire airbag is formed by stacking three or more base fabrics, the amount of base fabric used can be reduced, and the manufacturing cost can be reduced. It becomes easy to fold small. What is necessary is just to form a tack part in the shape which covers a connection part, and can suppress the increase in the usage-amount of gas, and can suppress the raise of the manufacturing cost of an airbag apparatus. Since the tack portion is formed on the outer side of the expansion portion, smooth and rapid deployment of the expansion portion can be easily realized without restricting the flow of gas inside the expansion portion. A connection part connects base fabric parts directly, can simplify a structure and can reduce manufacturing cost.

  According to the airbag of the second aspect, in addition to the effect of the first aspect, the tack portion includes a first fold line that is close to the parallel connecting portion and is parallel to the connecting portion, and the first fold. Since the base fabric part is folded back by a second fold line parallel to the line, and the tack holding part is constituted by the outer peripheral connecting part, the structure is simple and the manufacturing process can be simplified, and the manufacturing cost is reduced. it can.

  According to the airbag of the third aspect, in addition to the effect of the first or second aspect, since the tack part is provided only on the base cloth part located on the anti-protected object side, the tack part interferes with the protected object. Can be prevented. By providing the tack part only on one base cloth part, the manufacturing process can be simplified and the manufacturing cost can be reduced.

  According to the airbag of the fourth aspect, in addition to the effect of the first or second aspect, since the tack portion is provided only on the base cloth portion positioned on the protected object side, the tack portion is a member on the predetermined surface side. It is possible to prevent the air bag from interfering with the air bag and to easily and smoothly deploy the airbag. By positioning the tack portion on which the gas hardly flows into the inflatable portion on the protected object side, the reaction force of the airbag against the protected object can be easily adjusted to be small. By providing the tack part only on one base cloth part, the manufacturing process can be simplified and the manufacturing cost can be reduced.

  According to the airbag of the fifth aspect, in addition to the effect of the first or second aspect, since the tack portions are alternately provided on the first base fabric portion and the second base fabric portion, the first base fabric portion is provided. By approximating the shapes of the cloth part and the second base cloth part, the material collecting efficiency of the base cloth can be easily improved, and the manufacturing cost can be reduced. Since the tack portions are arranged on both sides of the airbag without being biased, it is possible to suppress the warp when the airbag is inflated and deployed, and to easily and stably deploy the airbag.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view schematically showing an embodiment of an airbag of the present invention, where (a) is a perspective view seen from one side, and (b) is a perspective view seen from the other side. It is II sectional drawing of Fig.1 (a) which shows an airbag same as the above. It is sectional drawing of the II equivalent position of Fig.1 (a) which shows the state at the time of expansion | deployment of an airbag same as the above. It is the one part perspective view which notched a part of the state at the time of the expansion | deployment which shows typically 2nd Embodiment of the airbag of this invention. It is explanatory drawing which shows typically 3rd Embodiment of the airbag of this invention, (a) is sectional drawing of the state before expansion | deployment, (b) is sectional drawing of the state at the time of expansion | deployment. It is explanatory drawing which shows typically 4th Embodiment of the airbag of this invention, (a) is sectional drawing of the state before expansion | deployment, (b) is sectional drawing of the state at the time of expansion | deployment. It is explanatory drawing which shows typically 5th Embodiment of the airbag of this invention, (a) is sectional drawing of the state before expansion | deployment, (b) is sectional drawing of the state at the time of expansion | deployment. It is explanatory drawing which shows typically 6th Embodiment of the airbag of this invention, (a) is sectional drawing of the state before expansion | deployment, (b) is sectional drawing of the state at the time of expansion | deployment. It is the one part perspective view which notched the part which shows typically 7th Embodiment of the airbag of this invention.

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

  1 to 3, reference numeral 1 denotes an airbag, and the airbag apparatus provided with the airbag 1 is also called a curtain airbag apparatus, a curtain type airbag module (CAB), or a head protection airbag apparatus. Thus, it is arranged on the roof side part which is the installation part of the compartment of the vehicle body constituting the automobile as the vehicle. 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 impact or rollover. In addition, it is deployed in a substantially planar manner on the side of the occupant seated in the seat as the object to be protected to protect the occupant.

  Hereinafter, the front-rear direction, the vehicle width direction, the both-side direction, the up-down direction, and the like are based on the straight direction of the vehicle body as a reference, the front side direction (arrow F direction shown in FIG. 1), and the downward direction as the predetermined direction (FIG. 1). The arrow (in the direction of arrow A shown in FIG. 1), the inner side as the protected object side (the direction of arrow B shown in FIG. 1), the outer side as the anti-protected object side (in the direction of arrow C shown in FIG. 1), etc. Further, D shown in FIG. 1 is a dummy head imitating an occupant as a protected object seated on the seat.

  Although the vehicle body of the automobile provided with this airbag device is not shown, it has a front seat and a rear seat in which a passenger can sit, and a window portion that can be opened corresponding to the front seat and the rear seat. A door with a (side window) is provided. Further, a front pillar called A pillar, a center pillar called B pillar, and a rear pillar called C pillar are provided in order from the front side on both sides of the passenger compartment. And the predetermined surface E is comprised by the side part of the both sides of a vehicle interior by these window parts, a door, and each pillar. Further, a roof side rail as a mounting member constituting the vehicle body panel is provided on the upper side of these pillars, that is, the upper edge which is one edge of the window, and the ceiling panel of the ceiling part is provided via the roof side rail. Is supported. A front glass (front windshield) is provided on the front side of the front pillars on both sides, and a rear glass is provided on the rear side of the rear pillars on both sides.

  The roof side portion is a side upper edge portion of the passenger compartment along the upper edge of the door opening of the vehicle body, and extends from the edge portions on both sides of the ceiling panel in a direction intersecting with the edge portion. The predetermined surface on which the airbag 1 is deployed inside an arc virtually formed by the edge portion of the ceiling panel and the front pillar and the rear pillar, which is set up to a portion covering almost the entire length of the extending front pillar and rear pillar. E is set. In addition, a roof trim, which is a soft panel called roof lining or head lining, is disposed on the lower surface of the ceiling panel, that is, on the passenger compartment side. The roof trim covers the passenger compartment side of the roof side portion. Yes.

  The airbag device is a so-called front-rear seat airbag that can protect front and rear passengers, and in addition to the airbag 1 that is folded and stored along the roof side portion, the rear portion of the rear seat An inflator 20 that is located on the upper side and supplies gas for inflation to the airbag 1, a metal bracket that attaches the airbag 1 to the roof side rail, and a folded airbag 1. A resin protector that protects the airbag 1 during deployment, a hanging strap connected to the front end of the airbag 1, a shape holding member that holds the shape of the folded airbag 1, and the like are provided. Has been.

  The airbag 1 is a combination of one or a plurality of base fabrics, and in the present embodiment, a pair of two base fabrics are overlapped and joined to form an airbag main body 30 formed into a flat bag shape. The vehicle body 30 includes an attachment piece for attaching the vehicle body extending from a plurality of locations on the upper edge of the airbag main body 30, and is folded into an elongated shape and stored in the roof side.

  That is, the airbag main body 30 includes a first base cloth 31 as a first base cloth part disposed on the vehicle interior side (inward B) and a second base cloth disposed on the vehicle body side (outward C). A second base fabric 32 as a base fabric portion, and the base fabrics 31 and 32 are overlapped and sewn together at the outer peripheral connecting portion 34, and a bag-like inflatable portion 36 that inflates and expands when gas flows in, An inflator connecting portion 37 that is a gas port communicating with the inflating portion 36, a non-inflating portion 38 in which gas does not flow in and inflated and deployed, and the like are provided. Further, a plurality of connecting portions 40 for connecting the first base fabric 31 and the second base fabric 32 are formed in the inflating portion 36, and a second base is provided corresponding to each connecting portion 40. The cloth 32 forms a plurality of tack portions 42 each having a bag shape communicating with the inflating portion 36.

  The inflating part 36 is an air chamber that is a hollow part, and the first air chamber 44 that is a front seat protection part that is deployed to face the front seat occupant, and the rear part that is deployed to face the rear seat occupant. A second air chamber 45 serving as a seat protection portion and a communication passage 46 provided along the upper edge portion of the airbag main body 30 with the front-rear direction as a longitudinal direction and communicating between the upper portions of the air chambers 44, 45 are provided. I have. Further, the inflator connecting portion 37 is formed by branching upward from the communication passage 46 in the central portion in the front-rear direction of the inflating portion 36.

  Each base fabric 31, 32 is a flat woven fabric also called a base fabric panel, and is coated as necessary. Further, the outer peripheral connecting portion 34 and the connecting portion 40 for connecting, that is, connecting the base fabrics 31 and 32 are basically in a state in which the base fabrics 31 and 32 are directly in close contact with each other by a thread using a sewing machine. It is sewn and is configured to be substantially airtight or highly airtight using a sealant or the like as required. The outer periphery connecting portion 34 sews the outer periphery of the inflating portion 36 except for the front end portion of the inflator connecting portion 37 communicating with the inflator 20, thereby defining the inflating portion 36 which is a passenger protection area. Further, the non-inflatable portion 38 is provided, for example, at the lower side of the communication passage 46, that is, at a position where the normal occupant between the first air chamber 44 and the second air chamber 45 does not face, for example, the outer first It is composed of a single base fabric consisting of only the base fabric 31.

  And the connection part 40 connects the base fabrics 31 and 32, prescribes | regulates the thickness dimension of the air layer at the time of expansion | deployment of the airbag 1, ie, an impact absorption stroke, and guides the gas flow of the expansion part 36 Thus, the first air chamber 44 and the second air chamber 45 of the inflating part 36 are positioned in, for example, four locations of the first air chamber 44 and two locations of the second air chamber 45. The direction is a longitudinal direction, which is linear or linear, and is formed so that the upper and lower end portions are separated from the outer peripheral coupling portion 34. And the part between each connection part 40 is a cell which comprises each air chamber 44,45.

  Further, the tack portion 42 corresponds to each connecting portion 40 and is formed so as to cover each connecting portion 40. In this configuration, each tack portion 42 is formed integrally with the second base cloth 32 located on the vehicle body side. That is, in the second base fabric 32, a first fold line 51 that is a valley fold is formed adjacent to each connecting portion 40, and is further spaced from the first fold line 51 by a predetermined dimension. Parallel to the first fold line 51, a second fold line 52, which is a so-called mountain fold, is formed, and each tack portion 42 is folded back in a waveform so as to cover each connecting portion 40. Each tack portion 42 is stitched together by a tack holding portion 54 that is located at the upper and lower end portions and is constituted by the outer peripheral connection portion 34. The folded portions, that is, the respective tack portions 42 themselves are connected by the tack holding portion 54, and the respective tack portions 42 are connected to the outer shell of the expansion portion 36 of the second base fabric 32. The inside of each tack part 42 communicates with the inflating part 36, and gas is supplied through the inflating part 36.

  Although not shown, the base fabrics 31 and 32 are overlapped with a base fabric for improving strength and heat resistance or guiding gas as needed.

  On the other hand, the inflator 20 includes a cylindrical inflator main body, and in this inflator main body, a combustion type for burning chemicals (pyro technique type), a storage type for storing gas at high pressure (storage type), or these combustion types A gas generating means such as a hybrid type combining a storage type and a storage type is incorporated. And the gas supply part which injects gas is provided in the front-end part which is the one end part of the longitudinal direction of this inflator main-body part, and the connector part to which the electric wire called a harness is connected to the rear-end part of an inflator main-body part Is provided.

  Further, the airbag device includes a control device (not shown) provided with a sensor or the like on the vehicle body side, and this control device is electrically connected to the inflator 20 via a harness.

  Next, the manufacturing process of this airbag 1, the assembly process of an airbag apparatus, and the attachment process to a vehicle body are demonstrated.

  First, the airbag 1 cuts out each base fabric 31 and 32 from a raw fabric. In a state in which each base cloth 31 and 32 is cut out from the original fabric and spread in a planar shape, the second base cloth 32 is formed to have a larger length in the front-rear direction than the first base cloth 31. Then, the second base cloth 32 is overlapped with the first base cloth 31, and the base cloths 31, 32 are sewn to form a connecting portion 40 at one place, and the second base cloth 32 is formed in the vicinity of the connecting portion 40. The cloth 32 is folded upward to form the tack portion 42. Then, in the state where all of the connecting portions 40 and the tack portions 42 are formed, the planar shapes of the base fabrics 31 and 32 are substantially the same except for the portion of the non-inflatable portion 38.

  Next, the tuck portions 42 are brought down on the connecting portions 40 and are sewed along the outer peripheral portions of the respective base fabrics 31 and 32 in a state where the tuck portions 42 are overlapped so as to cover the connecting portions 40. At the same time as forming the connecting portion 34, the end portion of each tack portion 42 is fixed by the outer peripheral connecting portion 34, that is, by forming the tack holding portion 54 that holds the end portion of each tack portion 42, the airbag 1 is formed. Composed.

  Then, the airbag main body 30 of the airbag 1 is folded into a predetermined elongated shape, and the folded shape is held using the shape holding member. Various methods can be used for folding the airbag main body 30. For example, the airbag main body 30 is expanded in a flat shape, and the lower side when deployed is spiral, that is, rolled. The upper part at the time of unfolding is formed into a corrugated shape, that is, a bellows-like guide part, and the guide part is folded so as to wrap from the upper part of the stack part to both side parts. For example, the stacking unit winds the airbag body 30 so as to wind up from the lower end to the outside, that is, the predetermined surface E side. Further, the guide portion is a portion including the communication path 46, and is configured by folding the upper side portion so that the fold line faces the vehicle compartment side and folding the lower side portion so that the fold line faces the vehicle outer side.

  Then, a bracket and a protector are attached to the folded airbag 1, and the inflator 20 is connected to the inflator connecting portion 37 to constitute a module that is an assembled state of the airbag device.

  Then, the module of the airbag device is brought into the passenger compartment, the airbag 1 is disposed along the roof side portion, and the bracket is fixed to a predetermined position of the roof side rail. In addition, the attachment fitting at the tip of the hanging strap at the front end of the airbag 1 is attached to the front pillar. Further, the inflator 20 is attached to the vehicle body using a retainer, and the harness derived from the inflator 20 is connected to a control device provided in the vehicle body. Then, the pillar garnish is attached to each pillar, the roof trim is attached to the ceiling panel of the vehicle body, and the airbag device is covered with the roof trim, thereby completing the operation of attaching the airbag device to the roof side portion of the vehicle body.

  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 20 is actuated by the control device, and the gas injected from the inflator 20 is introduced into the inflating portion 36 of the airbag main body 30. This gas is smoothly and rapidly supplied to the front and rear end portions through the communication path 46 located in the guide portion. In this state, the wavy guide portion having a small ventilation resistance and a shape that rapidly expands expands, and pushes down the accumulation portion positioned below. That is, the shape retaining member is cleaved, and further, the roof trim is pushed downward, so that the airbag main body 30 of the airbag 1 rapidly protrudes downward from the roof side portion.

  Next, the gas is guided to the connecting portion 40 and supplied downward to each cell of the inflating portion 36, and the connecting portion 40, that is, the cell is positioned and folded into a roll shape having a slightly large ventilation resistance. The accumulating portion develops substantially downward in a predetermined direction along the predetermined surface E so as to be rewound while rubbing the predetermined surface E which is the side inner surface of the vehicle interior, so to speak, a curtain shape along the side of the vehicle interior It expands and expands to cover the front and rear windows and each pillar.

  Simultaneously with the expansion of the expansion portion 36, gas is supplied from the expansion portion 36 to the inside of each tack portion 42, and each tack portion 42 expands and develops toward the predetermined surface E side. Here, the positions of the tack portions 42 are held by the tack holding portions 54 adjacent to the portions covering the connecting portions 40, and therefore, the tack portions 42 are deployed in a state of covering the connecting portions 40 as shown in FIG. Therefore, even at the position of each connecting portion 40, an air layer having a constant thickness is secured, so-called zero stroke zone is eliminated, and the connecting portion 40 in the airbag 1 in which the base fabrics 31, 32 are connected by the connecting portion 40. The shock absorbing stroke at the position is easily secured.

  Thus, according to the present embodiment, the first air chamber 44 is used for the airbag 1 of the so-called curtain airbag device that is attached to the roof side portion of the vehicle body and inflated and deployed along the predetermined surface E. Deploys quickly while ensuring the necessary thickness across the entire protection area facing the side of the front seat occupant's seating position, and the second air chamber 45 is located on the side of the rear seat occupant's seating position. Rapidly deploying while securing the necessary thickness dimensions in the entire protection area facing the passenger, and deploying to protect the head and chest of each front and rear seat occupant. Can be protected.

  That is, according to the airbag 1 of the present embodiment, the inflatable portion 36 into which the gas is introduced inside can be realized in a flattened shape, with the overall thickness dimension being restricted by the connecting portion 40, When the inflating part 36 is inflated, the tack holding part 54 holds the connecting part 40 so that the tacking part 42 is inclined, and the inflated tack part 42 expands the shock absorbing stroke at the part of the connecting part 40. It is possible to secure and improve the shock absorption characteristics in the entire protection area.

  In addition, the tack portion 42 can be formed by folding the base fabric, here the second base fabric 32, on the outer side of the inflatable portion 36 and holding the shape by the tack holding portion 42, thus simplifying the configuration and reducing manufacturing costs. it can. Further, the tack portion 42 includes a first fold line 51 that is close to the connecting portion 40 that is linear or linear, and is parallel to the connecting portion 40, and a second fold line that is parallel to the first fold line 51. Since the second base fabric 32 is folded back by 52 and the tack holding portion 54 is formed integrally with the outer peripheral connecting portion 34, the configuration is simple, the manufacturing process can be simplified, and the manufacturing cost can be reduced. .

  Moreover, the tack part 42 should just be formed only in the vicinity of the connection part 40, and since it is based on two panels which added the increment for the length of the tack part 42, the usage-amount of the base fabrics 31 and 32 is reduced. Compared to a configuration in which the entire airbag 1 is formed by stacking three or more base fabrics, the usage amount of the base fabrics 31 and 32 can be reduced, the manufacturing cost can be reduced, and the airbag 1 can be folded in a small size. It becomes easy.

  In addition, the tack part 42 only needs to be formed in a shape that covers only the connecting part 40, and the capacity of the additional inflator 20 is suppressed by minimizing the capacity of the part that is additionally inflated, thereby greatly increasing the capacity of the inflator 20. There is no need to increase it, and an increase in the manufacturing cost of the airbag device can be suppressed.

  Further, the tack portion 42 is formed to protrude outward from the inflating portion 36, and since the inside of the inflating portion 36 is not partitioned more than necessary, the flow of gas inside the inflating portion 36 is not restricted. It is easy to fill the entire area of the expansion part 36, can supply gas quickly to the end of the expansion part 36, and does not hinder the expansion characteristics directed by the folded shape, and can smoothly expand the expansion part 36 It can be easily realized.

  The connecting portion 36 may be configured to directly connect the base fabrics 31 and 32, and can be manufactured by a sewing operation from the outside of the airbag 1 of a normal sewing machine, and is integrated with the outer shell by so-called jacquard weaving. Compared to the configuration of forming the tether and the tether that connects the base fabrics at a predetermined interval inside the inflated portion, it does not require expensive equipment such as large-scale or complicated, and simplifies the manufacturing process by configuration and sewing. Manufacturing costs can be reduced.

  Furthermore, since the tack portion 42 is provided only on the second base cloth 32 positioned on the side opposite to the occupant, that is, on the predetermined surface E side which is the vehicle body side, the first base cloth 31 on the occupant side is developed with a flat tendency. The tuck portion 42 can be prevented from interfering with the occupant.

  Furthermore, by providing the tack part 42 only on one of the base fabrics 31 and 32, the sewing of the tack part 42 can be performed from one side of the airbag 1, and the manufacturing process is simplified and the manufacturing cost is reduced. In addition to being able to reduce, the airbag 1 is warped and deformed when the airbag 1 is deployed. For example, the airbag 1 can be deployed with desired characteristics.

  In the above-described embodiment, the tack portion 42 is provided only on the second base fabric 32 on the side opposite to the occupant, but is not limited to this configuration.

  That is, by providing the tack portion 42 only on the first base cloth 31 located on the occupant side, that is, on the side opposite to the predetermined surface E that is the passenger compartment side, the second base cloth 32 on the vehicle body side is deployed with a flat tendency. Thus, the tack portion 42 can be prevented from interfering with the vehicle body member on the predetermined surface E side, and the airbag 1 can be easily and quickly deployed. Compared with the inflatable portion 36, the reaction force of the airbag 1 against the occupant can be easily adjusted to be small by positioning the tack portion 42 that hardly inflows of gas and is gently inflated on the occupant.

  Further, the tack portion 42 can be provided on both surfaces of the airbag 1, that is, both surfaces of the first base fabric 31 and the second base fabric 32. For example, as in the second embodiment shown in FIG. 4, the tack portions 42 are alternately provided on the first base fabric 31 and the second base fabric 32, so that the tack portions 42 of the airbag 1 are provided. It is also possible to arrange them on both sides, that is, the first base fabric 31 and the second base fabric 32 in a complementary manner.

  In the configuration shown in FIG. 4, the shape of the first base fabric 31 and the second base fabric 32 is approximated to a base fabric of a normal size, and the efficiency of material removal from the base fabric is improved. It can be improved easily and the manufacturing cost can be reduced. That is, when the tack portion 42 is set only on one of the base fabrics 31 and 32, a base fabric having a normal size and a base fabric having a large longitudinal dimension are cut out from the original fabric. Thus, depending on the size of the original fabric, it becomes difficult to efficiently cut out the base fabrics 31 and 32 from the original fabric, but the shape of the first base fabric 31 and the second base fabric 32 is set to a normal size. By approximating the shape of the base fabric, the base fabric can be easily and efficiently removed from the conventional raw fabric.

  Further, since the tack portion 42 is complementarily arranged on both surfaces of the airbag 1, that is, the first base fabric 31 and the second base fabric 32, the tack portion 42 is disposed on both surfaces of the airbag 1 without being biased. The warp deformation at the time of inflation and deployment of the airbag 1 can be suppressed, and the airbag 1 can be easily and stably deployed.

  In the configuration shown in FIG. 4, the inflator connecting portion 37 is connected to the rear end upper portion of the inflating portion 36.

  In addition, how the tack portion 42 is arranged on both surfaces of the airbag 1, or in which direction the airbag 1 is folded and held with respect to the longitudinal direction of the airbag 1 or the direction in which the gas flows is determined by the airbag 1. It can be set according to the overall shape and the like.

  For example, as in the third embodiment shown in FIG. 5, with respect to one tack portion 42, the other tack portion 42 is folded back on the opposite side with respect to the longitudinal direction of the airbag 1, It can be held by the tack holder 54.

  In addition, tack portions 42, 42 that form a pair on both surfaces of the airbag 1, that is, the first base fabric 31 and the second base fabric 32, can be provided for one connecting portion 40. The paired tack portions 42, 42 may be folded back in the same direction as in the fourth embodiment shown in FIG. 6, and are different from each other as in the fifth embodiment shown in FIG. That is, it may be folded back to the opposite side. Further, as in the sixth embodiment shown in FIG. 8, the pairs of tack portions 42, 42 can have different shapes, that is, capacities.

  Further, the tack retaining portion 54 may take another configuration in addition to the configuration formed integrally with the outer peripheral connection portion 34 or together with the configuration formed integrally with the outer peripheral connection portion 34. For example, as in the seventh embodiment shown in FIG. 9, in addition to the tack holding portion 54 formed integrally with the outer peripheral coupling portion 34, the tip end portion of the tack portion 42, that is, the second folding line 52 is sewn. In addition, a tack holding portion 56 that connects the second base fabrics 32 may be provided, and the developed shape of the tack portion 42 may be adjusted to be flat at the central portion in the vertical direction.

  In the configuration shown in FIG. 9, the connecting portion 40 has one end portion 40a spaced from the outer peripheral connecting portion 34 to form a gas flow path, and the other end portion 40b reaches the outer peripheral connecting portion 34, so that the gas flows. The end of the cell is closed so that it does not flow.

  In the above embodiment, the airbag 1 is formed using two independent base fabrics 31 and 32. For example, a single base fabric connected at the front end of the airbag main body 30 is used. In addition, the front end portion can be folded back.

  The present invention can be applied to, for example, an airbag device that deploys an airbag along a window on a side portion of an automobile and protects the head of an occupant.

1 Airbag
31 First base fabric as the first base fabric
32 Second base fabric as second base fabric
34 Outer connection
36 Expansion part
40 connection
42 Tack part
51 First fold line
52 Second fold line
54, 56 Tack holder E Specified surface

Claims (5)

An airbag in which gas is introduced from a folded state and inflated and deployed flat along a predetermined surface,
A first base fabric part;
A second base fabric portion arranged to overlap the first base fabric portion;
An outer peripheral connecting portion that joins the first base fabric portion and the second base fabric portion, and defines an inflating portion into which gas is introduced inside, and
The thickness dimension of the air layer when the expansion portion is deployed by directly connecting the first base fabric portion and the second base fabric portion at the expansion portion defined by the outer peripheral connection portion. A connecting part that regulates ,
A tack portion into which gas is introduced from the inflating portion while folding a portion located in the inflating portion of at least one of the base cloth portions outwardly of the inflating portion to cover the connecting portion located in the inflating portion;
An airbag comprising: a tack retaining portion that connects base fabric portions with a part of the tack portion and retains the shape of the tack portion. The connecting part is linear,
The tack portion is formed by folding back the base fabric portion by a first fold line that is close to the connecting portion and parallel to the connecting portion and a second fold line that is parallel to the first fold line,
The airbag according to claim 1, wherein the tack holding portion is configured by an outer peripheral connection portion. The airbag according to claim 1 or 2, wherein the tack portion is provided only on the base fabric portion located on the side of the object to be protected. The airbag according to claim 1 or 2, wherein the tack portion is provided only on the base fabric portion located on the protected object side. The airbag according to claim 1 or 2, wherein the tack portions are alternately provided on the first base fabric portion and the second base fabric portion.

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