JP2015157531A - Curtain airbag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curtain air bag, in which gas inflow from a main inflation part to a sub inflation part is suppressed in an initial stage of expansion for rapidly inflating the main inflation part, and when inside of the main inflation part reaches to predetermined pressure, gas inflow to the sub inflation part is increased, and pressure in the main inflation part for protection of occupants can be maintained for relatively long time, and folding of the bag is easy.SOLUTION: The curtain airbag comprises: a main inflation part; and a sub inflation part communicating to the main inflation part via a communication part. The curtain airbag further comprises: a depth setting which directs from a vehicle lower side of the communication part on the sub inflation part side toward a vehicle upper side; and a joint part which is jointed in a state that a channel of the communication part is folded, by folding a communication part side part of the depth setting. When inner pressure reaches to predetermined pressure, joint of the joint part is released.

Description

  The present invention relates to a curtain airbag that is installed in a vehicle and that is deployed along a side of the vehicle to protect an occupant in the event of a vehicle collision, and more particularly to a curtain airbag that has excellent early deployment characteristics.

  2. Description of the Related Art In recent years, an airbag device has been widely used as a safety device for protecting an occupant from an impact when a vehicle collides. The airbag device instantly inflates into the space between the occupant and the interior structure at the time of collision, and has a function of absorbing the impact when the occupant directly collides with the instrument panel, side door, handle, etc. . Therefore, as an airbag device, a sensor that detects rapid deceleration when receiving an impact such as a vehicle collision, an inflator that generates a high-pressure gas for inflation by receiving a signal from the sensor, and an inflation from the inflator An air bag body that is inflated and deployed by the high-pressure gas for reducing the impact of the occupant and a diagnostic circuit that determines whether or not the air bag system is functioning normally are provided.

  In recent years, the use of side airbags and curtain airbags corresponding to side collisions has increased as the airbags, and curtain airbags corresponding to vehicle rollovers have attracted attention. The curtain airbag is normally folded and stored inside the roof side above the center pillar, and is deployed along the side of the window inside the vehicle.

  Such a curtain airbag is known to include a main inflating portion and a sub inflating portion communicating with the main inflating portion, and move the gas in the main inflating portion to the sub inflating portion when the internal pressure of the main inflating portion increases. ing. (For example, refer to Patent Documents 1 and 2) With these configurations, it is possible to avoid a rapid change in the internal pressure of the main inflating portion and to maintain a predetermined pressure for protecting the occupant of the main inflating portion for a relatively long time. Can protect passengers.

  Patent Document 1 describes a configuration in which a rupture portion that is ruptured by expansion and increases the volume of the sub-expansion portion is provided in the sub-expansion portion. However, in order to provide the breakage portion in the sub-expansion portion, it is necessary to sew the sub-expansion portion or use an adhesive inside the bag. When the sub-expansion portion is stitched, a needle hole is opened in the expansion portion, and it is not preferable because it is difficult to maintain the internal pressure. Furthermore, the internal pressure cannot be maintained for a long time when the vehicle rolls over. In addition, when an adhesive or the like is used inside the bag, the number of steps increases. Furthermore, in order to obtain the effect by the method of Patent Document 1, the fracture portion must be long to some extent. However, if the fracture distance is long, it becomes difficult to break at a desired time.

Moreover, in patent document 2, the communication part which connects a main expansion part and a sub expansion part, the folding part which folded up the base fabric of the position of a communication part, and the regulation means for maintaining this folding part shape are provided. Thus, an airbag configuration is described in which the communication portion is closed at the initial stage of deployment and opened at a predetermined time.
However, it is difficult to hold the state where the base fabric at the position of the communication portion is folded for a certain amount of time with the restriction means as described, and the bag is rolled after the communication portion is folded. When folded, wrinkles are generated between the overlapping part of the base fabric and the non-overlapping part, making it difficult to roll the bag. In addition, it is necessary to prepare a regulating member separately, which leads to an increase in material costs and man-hours, and in order to hold the folding of the base fabric, it is necessary to attach the regulating member to both sides of the bag, and further, the material cost and This leads to an increase in man-hours.

JP 2007-161163 A JP 2011-116155 A

  The present invention solves the above-described problem. Even if no regulating member is provided, the main inflating portion is rapidly inflated by suppressing the inflow of gas from the main inflating portion to the sub inflating portion at the initial stage of deployment. When the inside of the inflating part reaches a predetermined pressure, the inflow of gas to the sub-inflating part is increased, and the pressure for protecting the occupant of the main inflating part can be maintained for a relatively long time. An object is to provide a curtain airbag that is easy.

  That is, the present invention provides a curtain airbag having a main inflating portion and a sub inflating portion communicating with the main inflating portion via a communicating portion, from the vehicle lower side on the sub inflating portion side of the communicating portion to the vehicle upper side. A notch that has a notch, and a joining portion that joins in a state in which the flow path of the communicating portion is folded by folding the communicating portion side portion of the notch, and the internal pressure of the main expansion portion has reached a predetermined pressure The present invention relates to a curtain airbag characterized in that the joint of the joint is sometimes released.

  Moreover, it is preferable that the said notch is L-shaped.

  Moreover, it is preferable that the main expansion portion side of the communication portion also has a cut from the vehicle lower side to the vehicle upper side.

  According to the present invention, even without a regulating member, in the initial stage of deployment, the main inflating part is rapidly inflated by suppressing the inflow of gas from the main inflating part to the sub-inflating part, and the inside of the main inflating part is maintained at a predetermined pressure. A curtain airbag that increases the inflow of gas to the auxiliary inflatable part when it reaches, maintains the pressure for occupant protection of the main inflatable part for a relatively long time, and is easy to fold the bag. Can be provided.

It is the schematic plan view which showed an example of the curtain airbag of this invention. It is a schematic sectional drawing of the junction part periphery AA of the curtain airbag of this invention. It is a schematic plan view before bending and joining the communicating part of the curtain airbag of the present invention. It is the schematic plan view which showed another example of the curtain airbag of this invention. It is a schematic sectional drawing of the junction part periphery AA of the curtain airbag of FIG. FIG. 5 is a schematic plan view of the curtain airbag of FIG. 4 before bending and joining. It is a schematic plan view which shows an example of the bending and joining of this invention. FIG. 8 is a schematic plan view of the curtain airbag of FIG. 7 before bending and joining. It is a schematic sectional drawing of the junction part periphery AA of the curtain airbag of FIG.

  The present invention relates to a curtain airbag having a main inflating portion (hereinafter also referred to as a main chamber) and a sub inflating portion (hereinafter also referred to as a sub chamber) communicating with the main inflating portion via the communicating portion. A main inflating portion having a notch that extends from the vehicle lower side to the vehicle upper side on the inflating portion side and that joins in a state in which the flow path of the communicating portion is folded by folding the communicating portion side portion of the notch The curtain airbag is characterized in that the joining of the joining portion is released when the internal pressure of the battery reaches a predetermined pressure.

A curtain airbag according to a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic plan view of the curtain airbag according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA in the vicinity of the joint 8 in FIG. FIG. 3 is a schematic plan view of the curtain airbag of FIG. 1 before folding and joining. 1 and 3 are views of the curtain airbag as viewed from the occupant side.
As shown in FIG. 1, the airbag body 1 constituting the curtain airbag is joined by overlapping two substantially rectangular cut cloths and stitching the inside of the outer periphery with a suture. ing. A gas inlet 6 that is not joined is provided at a part of the outer peripheral edge, and the airbag main body 1 is attached to an inflator (not shown) at the gas inlet 6. In addition, joining for forming the outer peripheral edge and each chamber is not limited to stitching, and joining by a sealing agent or jointing by a combination of stitching and a sealing agent can be used.

  Further, when it is required to maintain the deployed internal pressure for a long time such as several seconds while the vehicle rolls over, it is preferable to seal the stitched portion with a sealant by joint use of stitching and the sealant.

  In the airbag main body 1, a sub chamber 3 is formed on the front side of the main body 2 for the front seat, and the main chamber 2 and the sub chamber 3 are connected via a communication portion 4 (see FIG. 3). It has the notch 9 which goes to the vehicle upper side from the vehicle lower side by the side of the subchamber 3 of the communication part 4, and joins in the state which bent the flow path of the communication part 4 by folding the part of the communication part 4 side of the notch 9 It has a joint 8. The main chamber 2 and the sub chamber 3 are separated and formed by joining the boundaries with stitches or the like, and communicate with each other through the communication portion 4. The joining portion 8 is provided at the base fabric end portion by the notch 9 and joined in a circular sewing portion 7 provided at the end portion of the stitching portion forming the main chamber 2 and the sub chamber 3.

  During deployment, gas from an inflator (not shown) flows through the rear seat expansion portion and the conduit portion 5 into the front seat main chamber 2 and expands. When the main chamber 2 expands and gas begins to flow into the folded communication portion 4 and the inside of the main chamber 2 reaches a predetermined pressure, the cloth around the joint portion 8 is pulled so that the communication portion 4 expands. Thus, the joining of the joining portion 8 is released, the folding of the communication portion 4 is eliminated, and the sub chamber 3 expands. The joint portion 8 is joined with a weaker force than that of the outer peripheral portion, and the joint portion 8 is designed to be eliminated when a predetermined pressure is reached. In addition, by designing the position where the joint portion 8 is joined in the circular sewing portion 7, it is possible to avoid affecting the joining of the joint portion 8 at the initial stage of expansion and deployment before reaching a predetermined pressure.

  In addition, although the sub chamber 3 is arrange | positioned in the vehicle body front side with respect to the main chamber 2 in said embodiment, you may arrange | position in the vehicle body rear side. In the above embodiment, an example in which a communication section and a sub chamber are provided in the front seat main room has been described. However, the communication section and the sub chamber may be installed in the rear seat main room.

  As shown in FIG. 3, the inside of the portion where the notch 9 is formed is stitched, and the communication portion 4 is formed. The shape of the notch 9 is not particularly limited as long as it does not hinder the object of the present invention, and may be a shape that is simply cut from the lower end portion of the base fabric to the upper side, but the communication portion without cutting the lower end portion of the base fabric. An L shape as shown in FIG. If it is this shape, since the lower end part of the airbag base fabric is aligned and the starting point which folds when fixing an airbag to a vehicle body is a straight line, it is easy to fold.

  FIG. 4 is a schematic plan view of a curtain airbag according to the second embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line AA around the joint 8 in FIG. FIG. 6 is a schematic plan view of the curtain airbag shown in FIG. 4 before folding and joining. 4 and 6 are views of the curtain airbag as seen from the occupant side. Since the configuration of the curtain airbag according to the second embodiment is basically the same as that according to the first embodiment described above, differences will be mainly described.

As shown in these drawings, in the curtain airbag according to the second embodiment, the communication part 4 is U-shaped, and not only on the side of the sub-chamber but also on the main room side of the communication part 4 below the vehicle. It differs from that according to the first embodiment in that it has a notch 9 directed from the side toward the vehicle upper side, and the notch 9 is U-shaped. If the main chamber side of the communication part 4 has a notch 9 from the vehicle lower side to the vehicle upper side so that the flow path of the communication part 4 is bent, the flow path of the communication part 4 can be easily bent. It is preferable that gas inflow into the chamber 3 is easily suppressed. Further, the cut 9 may be simply cut upward from the lower end of the base fabric, but the U-shape that is continuous with the lower cut of the communication portion 4 without cutting the lower end of the base fabric. preferable. When the airbag base fabric is U-shaped, the lower end portions of the airbag base fabric are aligned, and the folding start point when the airbag is fixed to the vehicle body is straight, so that it is easy to fold.
Although the shape of the communication part 4 is not specifically limited, L shape like FIG. 3 and U shape like FIG. 6 are preferable. Note that the L-shaped and U-shaped corner portions do not have to be strictly right angles, and include shapes that are slightly angled.

  The configuration and shape of the joint 8 are not particularly limited as long as the idea of the present invention is not hindered, but it is preferable in terms of strength to sew with a sewing thread of 600 dtex or less. Moreover, you may use the joining form demonstrated below as another example.

  FIG. 7 is a schematic plan view showing an example of bending and joining according to the present invention. FIG. 8 is a schematic plan view of the curtain airbag shown in FIG. 7 before bending and joining. FIG. 9 is a schematic cross-sectional view of the vicinity AA of the joint portion of the curtain airbag of FIG. As shown in FIG. 8, the shape of the joint portion 8 has a hooked shape such as an arrow shape, and is inserted into a slit 10 formed in the center of the circular sewing portion 7 as shown in FIGS. 7 and 9. May be. Such a configuration is preferable because joining is easy and it does not take time and effort for suturing.

  The curtain airbag having the above-described configuration suppresses the inflow of gas from the main chamber to the sub chamber at the initial stage of deployment without providing a regulating member, and rapidly expands the main chamber so that the main chamber has a predetermined interior. When the pressure is reached, the inflow of gas into the sub chamber is increased, the pressure for protecting the passenger in the main chamber can be maintained for a relatively long time, and the bag can be easily folded.

  A fiber fabric is used as the base fabric used in the airbag of the present invention. Here, the fiber fabric means a woven fabric woven using fiber yarns, a knitted fabric and a non-woven fabric knitted using fiber yarns.

  The fibers constituting the fiber fabric are not particularly limited, such as natural fibers, chemical fibers, and inorganic fibers. For example, Nylon 6, Nylon 66, Nylon 46, Nylon 610, Nylon 612 and the like, or aliphatic polyamide fibers obtained by copolymerization and mixing thereof, Nylon 6T, Nylon 6I, Nylon 9T and aliphatic amines represented by Copolymerized polyamide fiber of aromatic carboxylic acid, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate alone or a copolymer thereof, polyester fiber obtained by mixing, ultrahigh molecular weight polyolefin fiber, vinylidene, Chlorine-containing fibers such as polyvinyl chloride, fluorine-containing fibers containing polytetrafluoroethylene, polyacetal fibers, polysulfone fibers, polyphenylene sulfide fibers (PPS), polyethers -Terketone fiber (PEEK), wholly aromatic polyamide fiber, wholly aromatic polyester fiber, polyimide fiber, polyetherimide fiber, polyparaphenylene benzbisoxazole fiber (PBO), vinylon fiber, acrylic fiber One type or two or more types may be appropriately selected from cellulose fibers, silicon carbide fibers, alumina fibers, glass fibers, carbon fibers, steel fibers, and the like. Of these, synthetic fiber filaments are preferred from the viewpoints of versatility and the production process of the base fabric and physical properties of the base fabric. In particular, nylon 66 fiber is preferable from the viewpoints of physical properties, durability, heat resistance, and the like. From the viewpoint of recycling, polyester fibers and nylon 6 fibers are also preferable.

  These fibers include various additives that are usually used to improve spinnability, processability, durability, etc., such as heat stabilizers, antioxidants, light stabilizers, anti-aging agents, and lubricants. One or more of a smoothing agent, a pigment, a water repellent, an oil repellent, a concealing agent such as titanium oxide, a gloss imparting agent, a flame retardant, and a plasticizer may be used. In addition, when it is desirable to weave the calami weave, processing such as twisting, bulking, crimping, winding, or gluing may be performed. Further, as the form of the yarn, in addition to the long fiber filament, a spun yarn of short fibers, a composite yarn of these, or the like may be used.

  For example, when the fiber fabric is a woven fabric, it may be a plain weave, an oblique weave (basket weave), a lattice weave (ripstop weave), a twill weave, a knot weave, an entangled weave, an imitation weave, or a composite structure thereof. If necessary, in addition to the two axes of warp and weft, a multi-axis design including 60 degrees obliquely may be used, and the arrangement of the threads in this case may be the same as that of the warp or weft. Of these, plain weaving is preferable in that the denseness of the structure, the uniformity of physical properties and performance can be ensured.

  Fabric production may be selected as appropriate from various looms used for weaving ordinary industrial fabrics, for example, shuttle looms, water jet looms, air jet looms, rapier looms, and projectile looms. Good.

  When the fiber fabric is a knitted fabric, a single knitting structure such as a single knitting such as a single tricot knitting, a single cord knitting, a single atlas knitting, a weft knitting such as a flat knitting, a rubber knitting or a pearl knitting, or a combination thereof And those composed of double tissues. Moreover, when the said fiber fabric is a nonwoven fabric, what is manufactured by a chemical bond, a thermal bond, a needle punch, a spunlace, a stitch bond, a spun bond, a melt blow, wet, etc. is mention | raise | lifted.

  The single yarn thickness of the yarn constituting the base fabric may be the same or different, and is preferably in the range of 0.5 to 8 dtex, for example. Further, the strength of the single yarn is also preferably 5.4 cN / dtex or more, and more preferably 8 cN / dtex or more. Further, the cross-sectional shape of the single yarn of these fibers may be appropriately selected within a range that does not hinder the production of the fabric and the physical properties of the obtained fabric, such as a circle, an ellipse, a flat, a polygon, a hollow, and other irregular shapes. Moreover, you may use what integrated several thread | yarns from which thickness, cross-sectional shape, etc. differ by a combined yarn, twisting.

  The total fineness of the fibers is preferably 150 to 1000 dtex, and more preferably 235 to 700 dtex. If it is less than 150 dtex, the strength required for the airbag tends to be difficult to obtain. If it exceeds 1000 dtex, the weight becomes too large, and the thickness of the base fabric may increase, resulting in poor bag storage.

The base fabric preferably has a basis weight of 190 g / m ² or less and a tensile strength of 600 N / cm or more. If the basis weight and tensile strength are within this range, it can be said that it is light and excellent in physical properties. Here, the basis weight refers to the weight of the base fabric in an unprocessed state before application of an air permeability treatment agent to be described later.

The cover factor when the base fabric is a woven fabric is preferably 1500 to 2500. If the cover factor is smaller than 1500, it becomes difficult to obtain the airtightness of the bag because the opening of the fabric becomes larger. If the cover factor is larger than 2500, the thickness of the fabric increases and the bag storage property becomes worse. There is a fear. Here, the cover factor means that the warp yarn total fineness is D ₁ (dtex), the warp yarn density is N ₁ (lines / 2.54 cm), the weft total fineness is D ₂ (dtex), and the weft yarn density Is N ₂ (lines / 2.54 cm), (D ₁ × 0.9) ^1/2 × N ₁ + (D ₂ × 0.9) ^1/2 × N ₂ .

  The base fabric may be subjected to scouring and heat treatment.

  Further, as the base fabric, a fabric that has been subjected to an air-impermeable process by laminating and applying rubber, resin, or the like depending on the performance of the inflator, the bag capacity, the use site, or the like may be used. For that purpose, the resin adheres to at least the entire surface of one side of the base fabric, but is not present on the surface of the base fabric, the gap of the yarn bundle constituting the base fabric, or the gap of the single fiber yarn. Also good. It is preferable to fabricate the airbag so that the coated surfaces are inside by joining the surfaces having the resin layer, because of the heat resistance and that the damage to the coating can be suppressed even when an external force is applied to the base fabric. .

  Examples of the resin include halogen-containing rubbers such as chloroprene rubber, high baron rubber, and fluorine rubber, silicone rubber, ethylene propylene rubber, ethylene propylene terpolymer rubber, nitrile butadiene rubber, styrene butadiene rubber, isobutylene isoprene rubber, urethane rubber, and the like. Rubbers such as acrylic rubber, and halogen-containing resins such as vinyl chloride resin, vinylidene chloride resin, chlorinated polyolefin resin and fluorine resin, resins such as urethane resin, acrylic resin, ester resin, amide resin, olefin resin and silicone resin These are used alone or in combination. Of these, silicone rubber and silicone resin are preferable in terms of excellent flexibility, heat resistance, and weather resistance.

  As coating methods, 1) coating method (knife, kiss, reverse, comma, slot die, lip, etc.), 2) dipping method, 3) printing method (screen, roll, rotary, gravure, etc.), 4) transfer method, etc. (Transfer), 5) Laminating method, and 6) Spraying method. Among these, the coating method is preferable because the range of the application amount that can be set is large.

Moreover, as an application quantity, 5-60 g / m < ² > is preferable. If the coating amount is less than 5 g / m ² , the air permeability of the base fabric is increased, which may cause a problem in the airtightness of the bag. If the coating amount is more than 60 g / m ² , the thickness of the base fabric is increased. This may increase the thickness of the bag and cause problems with the bag storage.

  The occupant side cloth and the inflator side cloth may be joined by any method such as sewing, adhesion, welding, weaving, knitting, or a combination thereof, and robustness as an airbag. As long as it satisfies the impact resistance at the time of deployment and the impact resistance performance of the occupant.

  The sewing may be performed by seams applied to ordinary airbags such as main stitching, double chain stitching, one-sided stitching, overcasting stitching, safety stitching, staggered stitching, and flat stitching. Further, the thickness of the sewing thread may be 235 dtex (corresponding to 50th hand) to 2800 dtex (corresponding to 0 hand), and the number of stitches may be 2 to 10 stitches / cm. When multiple rows of stitch lines are required, the distance between the stitch lines should be about 2.2 mm to 8 mm, and a multi-needle type sewing machine should be used. If the sewing part distance is not long, a single needle sewing machine should be used. Multiple stitches may be sutured.

Furthermore, if necessary, a sealant or the like is applied, spread or laminated on the upper and / or lower portions of the seam, between the seams, the seam allowances, etc. in order to prevent gas from leaking from the seams such as the outer periphery seam. You may stop it.
Since the present invention is a modification of the non-inflatable portion outside the conduit portion, the influence on the production of the airbag main body is small, and the joining using the sealing agent can be performed without any problem.

  What is necessary is just to select suitably the sewing thread | yarn used for a sewing from what is generally called as a synthetic fiber sewing thread | yarn, and what is used as an industrial sewing thread | yarn. For example, nylon 6, nylon 66, nylon 46, polyester, polymer polyolefin, fluorine-containing, vinylon, aramid, carbon, glass, steel and the like may be used, and any of spun yarn, filament twisted yarn or filament resin processed yarn may be used.

  In addition, as described above, a heat-resistant protective cloth or a mechanical reinforcing cloth for protecting from the hot gas may be provided around the inflator attachment port according to the characteristics of the inflator to be used. These protective cloths and reinforcing cloths are made of heat-resistant materials such as heat-resistant fiber materials such as wholly aromatic polyamide fibers, wholly aromatic polyester fibers, PBO fibers, polyimide fibers, and fluorine-containing fibers. Alternatively, it is also possible to use a woven fabric that is separately prepared using a thread that is the same as the airbag body or thicker than the base fabric. Moreover, you may use what gave the heat resistant coating | covering material to the textile fabric.

1 Curtain airbag
2 Main expansion part (main room)
3 Sub-expansion part (sub-chamber)
4 communication part
5 Conduit section
6 Gas inlet
7 Circle sewing part
8 joints
9 notches
10 slits

Claims (3)

In a curtain airbag having a main inflating part and a sub-inflating part communicating with the main inflating part via the communicating part,
Having a notch from the vehicle lower side of the communication part to the vehicle upper side on the sub-expansion part side,
A joint portion that is joined in a state in which the flow path of the communication portion is folded by folding the communication portion side portion of the cut, and when the internal pressure of the main expansion portion reaches a predetermined pressure, A curtain airbag, wherein the bonding is released. The curtain airbag according to claim 1, wherein the cut is L-shaped. The curtain airbag according to claim 1 or 2, further comprising a cut from the vehicle lower side toward the vehicle upper side on the main inflating portion side of the communication portion.

Images