JP2014024533A - Airbag device and woven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airbag device which can easily reduce friction between an expansion body of an airbag and other objects.SOLUTION: An airbag device comprises: an airbag; a module cover which covers the airbag; a woven fabric 10 for preventing contact between hinge parts of the module cover and an expansion body of the airbag by its flap parts 11, 12; and a retainer which holds the woven fabric 10. The woven fabric 10 has a seam 13 which tears apart when the airbag expands and flap parts 11, 12 which are formed by the tearing of the seam 13. The seam 13 has main slits 14b that are adjacently arranged and sub-slits 14a, 14c for breaking weaving threads running in gaps 15 between the main slits 14b.

Description

  The present invention relates to an airbag device and a woven fabric that reduce friction between an inflatable body of an airbag and another object.

  For example, Patent Document 1 is known as a prior art document relating to a cover body of an airbag apparatus including a panel that is broken by a pressure when the airbag is inflated.

JP 2006-96267 A

  However, in the prior art, since the inflated airbag and other objects such as the hinge portion of the panel are in direct contact, it is difficult to reduce friction between the inflated body of the airbag and the other objects. An object of the present invention is to provide an airbag device and a woven fabric that can easily reduce friction between an inflatable body of an airbag and other objects.

In order to achieve the above object, the present invention provides:
An airbag,
A woven fabric that has a seam that is torn by inflation of the airbag, and a flap portion that is formed by tearing the seam, and that reduces friction between the airbag inflating body and other objects by the flap portion;
A holding part for holding the woven fabric,
The said seam provides the airbag apparatus which has an adjacent main slit and a sub slit which divides | segments the woven yarn which passes between the said main slits.

In order to achieve the above object, the present invention provides:
A woven fabric having a seam and a flap portion formed by tearing the seam, and reducing friction between an airbag inflatable body and another object by the flap portion,
The seam provides a woven fabric having adjacent main slits and sub-slits for dividing a woven yarn passing between the main slits.

  According to the present invention, it is possible to easily reduce friction between the inflatable body of the airbag and other objects.

It is a schematic sectional drawing of an example of an airbag apparatus. It is a schematic external view of an example of an airbag module. It is a top view of an example of a joint. It is an example of the expansion | swelling process of an airbag. It is a schematic external view of an example of an airbag module. It is a schematic external view of an example of an airbag module. It is a top view of an example of a joint. It is a top view of an example of a joint.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view schematically showing a configuration of an airbag apparatus 100 according to an embodiment of the present invention. The airbag device 100 is provided, for example, on the vehicle body side of the instrument panel 1 disposed on the front surface of the passenger seat of the vehicle. The airbag device 100 includes a module cover 20 and an airbag module 110. The module cover 20 is a cover panel that covers the airbag 8 that is folded and stored. The airbag module 110 includes the airbag 8, the woven fabric 10, the retainer 3, and the inflator 2.

  The airbag 8 is a cloth formed in a bag shape so as to be inflated and deployed toward an occupant sitting in the passenger seat with the module cover 20 opened. The woven fabric 10 has a seam 13 that is torn when the airbag 8 is inflated, and flap portions 11 and 12 that are formed by the seam 13 being torn. The woven fabric 10 is a shielding fabric for preventing the one hinge portion 53a of the module cover 20 and the inflatable body of the airbag 8 from directly contacting each other by blocking the flap portion 11. The woven fabric 10 may be a shielding fabric for preventing the other hinge portion 53b of the module cover 20 and the inflatable body of the airbag 8 from directly contacting each other by blocking the flap portion 12. The retainer 3 is a holding unit that holds the woven fabric 10. The inflator 2 is a gas generator that inflates the airbag 8.

  Therefore, according to the airbag device 100, the airbag module 110, and the woven fabric 10 having such a configuration, the flap portions 11 and 12 are sandwiched between the hinge portions 53a and 53b and the airbag 8 during the inflation process of the airbag 8. Rotate as shown. For this reason, it can block | close that the hinge parts 53a and 53b and the airbag 8 contact directly. As a result, friction between the hinge portions 53a and 53b and the inflatable body of the airbag 8 can be easily reduced.

  Next, the structure of the airbag apparatus 100 is demonstrated in detail.

  Similar to the instrument panel 1, the module cover 20 is a vehicle compartment panel that forms the front surface of the passenger seat that is a part of the inner wall that forms the vehicle compartment space. The instrument panel 1 is provided with an opening 1a formed in such a size that the bulged airbag 8 can pass through. The opening 1a is formed in a rectangular shape, for example. The module cover 20 is attached to the instrument panel 1 with a plurality of fixing members 4a so as to close the opening 1a. Although a clip is mentioned as a specific example of the fixing member 4a, the fixing member 4a may be a member other than the clip. The module cover 20 may be a separate member from the instrument panel 1, but may be a member integrally formed with the instrument panel 1.

  The module cover 20 may function as a support member that supports the airbag module 110 so as to cover it. For example, the module cover 20 is formed of a resin material such as a thermoplastic resin so as to have the outer panel 4 and the inner panel 5. It is preferable.

  The outer panel 4 is fixed to the instrument panel 1 with a fixing member 4a, for example. It is preferable that a plurality of cutout portions 4b are formed on the inner surface of the outer panel 4 on the airbag 8 side so that the outer panel 4 can be easily opened by the pressure of the airbag 8 being inflated. The outer panel 4 can be divided into a pair of fixed portions 4c and a pair of outer door portions 4d by the notch portions 4b. The three cutout portions 4b shown in the figure are formed by a series of linear grooves, for example.

  For example, the inner panel 5 is joined to the inner surface of the outer panel 4 on the airbag 8 side. Specific examples of the bonding method include vibration welding, but the bonding method may be a bonding method other than vibration welding. The inner panel 5 is fixed to, for example, a pair of support portions 51 fixed to the inner surface of the fixing portion 4c of the outer panel 4 on the airbag 8 side, and an inner surface of the outer door portion 4d of the outer panel 4 on the airbag 8 side. And a pair of inner door portions 52.

  The inner panel 5 has a pair of hinge portions 53a and 53b formed so as to connect the support portion 51 and the inner door portion 52 to each other. The hinge portions 53a and 53b are formed in a U shape that protrudes toward the airbag 8, for example, as shown in the figure. The inner panel 5 is preferably molded from a thermoplastic resin that is softer than the outer panel 4 so that the hinge portions 53a and 53b are easily deformed.

  The hinge parts 53a and 53b have a support part side connection part that connects the convex top part and the support part 51, and the low rigidity part 54 having lower rigidity than other parts of the hinge parts 53a and 53b is the support part. It may be formed at the side connection portion. Since the inner door portion 52 rotates with the hinge portions 53a and 53b as fulcrums, the hinge portions 53a and 53b and the inner door portion 52 can be easily rotated by forming the low rigidity portion 54 on the hinge portions 53a and 53b. Can be smooth. For example, the low-rigidity portion 54 may be softer than other portions of the hinge portions 53a and 53b, or may be thinned as illustrated. Moreover, hinge part 53a, 53b can be reduced in size by thickness reduction.

  Further, the inner panel 5 has a side wall 5 b that forms a space for accommodating the retainer 3. The side wall 5b is formed in a frame shape so as to protrude toward the airbag 8 with respect to the support portion 51, for example. A plurality of locking holes 5c are formed in the side wall 5b. The airbag module 110 is attached to the side wall 5b of the inner panel 5 by the plurality of hooks 3a provided on the outer surface 3b of the retainer 3 being hooked in the corresponding locking holes 5c.

  The airbag module 110 includes a retainer 3, an inflator 2, an airbag 8, a shape maintaining sheet 9, and a woven fabric 10.

  The retainer 3 has an accommodation space 3c surrounded by the outer side surface 3b. The housing space 3 c is a housing portion that houses the airbag 8 and the inflator 2. Since the retainer 3 has such a housing portion, the means for holding the woven fabric 10 and the means for housing the airbag 8 and the inflator 2 can be integrated with the retainer 3. Since the retainer 3 is fixed to the vehicle body frame 7 via the connecting member 6, the airbag module 110 can be firmly fixed to the vehicle body. The shape of the retainer 3 is not limited to the illustrated form.

  The inflator 2 generates gas for inflating and deploying the airbag 8 based on a control signal from a control circuit (not shown). The inflator 2 may be externally attached to the retainer 3 without being accommodated in the accommodation space 3 c of the retainer 3.

  The airbag 8 is accommodated in the retainer 3 in a state where the airbag 8 is folded inflatable by the gas supplied from the inflator 2. Since the folded form of the airbag 8 may be arbitrary, it is not particularly illustrated.

  The shape holding sheet 9 is a cloth material for holding the folded shape of the airbag 8 by wrapping the airbag 8 in a folded state. Thereby, the folding shape of the airbag 8 can be made difficult to collapse in the retainer 3. The shape maintaining sheet 9 has a seam 9 a that is torn by the inflation pressure of the airbag 8 inflated by the gas supplied from the inflator 2. When the shape maintaining sheet 9 is torn at the position of the joint 9a, the airbag 8 jumps out of the shape maintaining sheet 9 while inflating, and presses the woven fabric 10 from the inside.

  The woven fabric 10 is installed between the hinge portions 53a, 53b and the airbag 8 so as to cover the opening of the accommodation space 3c of the retainer 3 in order to protect the hinge portions 53a, 53b and the airbag 8 from friction. . The woven fabric 10 is held by being hooked on the hook 3 a of the retainer 3 so as to straddle the upper part of the airbag 8 wrapped with the shape maintaining sheet 9. The upper portion of the airbag 8 is a portion of the airbag 8 on the side in which the airbag 8 protrudes from the retainer 3 due to inflation, and does not necessarily coincide with the upper portion when the vehicle is mounted. The end 10c of the woven fabric 10 hooked by the hook 3a is sandwiched between the side wall 5b of the inner panel 5 and the outer surface 3b of the retainer 3.

  FIG. 2 is a schematic external view of an airbag module 110A that is an example of the airbag module 110 shown in FIG. 2A is a perspective view, FIG. 2B is a front view, FIG. 2C is a plan view, and FIG. 2D is a side view. The retainer 3 is schematically shown as a box-shaped rectangular parallelepiped that accommodates the folded body of the airbag 8.

  The shape-holding sheet 9 that wraps the folded body of the airbag 8 includes a seam 9a that is linearly formed along the width direction of the vehicle when the airbag device 100 (airbag module 110) is mounted on the vehicle. Have The shape maintaining sheet 9 is torn along the seam 9 a at the position of the seam 9 a due to the expansion of the airbag 8. For example, the joint 9a is formed by linearly forming one or more slits and one or more connecting portions.

  The woven fabric 10 is, for example, a single piece of cloth formed in a square shape. Further, the woven fabric 10 may be a single piece of fabric formed by joining a plurality of woven fabrics by sewing or the like. A plurality of attachment holes 16 formed in a size that allows the plurality of hooks 3 a of the retainer 3 to pass through are formed in rows at the end portions 10 c on both sides of the woven fabric 10. The plurality of hooks 3 a are provided in a row on the outer side surfaces 3 b of both sides of the retainer 3 facing each other. The plurality of hooks 3 a are hooked in the corresponding attachment holes 16, whereby the woven fabric 10 is held so as to cross over the airbag 8 wrapped around the shape holding sheet 9.

  On the woven fabric 10, a seam 13 that is torn due to the expansion of the airbag 8 is formed linearly along a direction that is the width direction of the vehicle when the airbag device 100 (airbag module 110) is mounted on the vehicle. ing. When the seam 13 is torn, the flap portion 12 is rotated around the one end 10c by being pushed by the airbag 8 inflated by breaking the shape retaining sheet 9 along the seam 9a at the position of the seam 9a. Move. At the same time, when the seam 13 is torn, the flap part 11 is pushed by the airbag 8 that is inflated by breaking the shape-retaining sheet 9 along the seam 9a at the position of the seam 9a. It rotates around the other end 10c. As is apparent from the drawing, the woven fabric 10 has flap portions 11 and 12 that are connected to each other at the seam 13 before the seam 13 is torn and are formed by the seam 13 being torn.

  The seam 13 is formed in an intermediate portion 10b between the top portion 10a of the woven fabric 10 and one end portion 10c. Thereby, the flap length from the other end 10c of the flap portion 11 to the joint 13 can be made longer than the flap length from the one end 10c of the flap 12 to the joint 13. Thereby, as shown in FIG. 1, for example, before the airbag 8 is inflated, even if the shortest distance from the woven fabric 10 to the hinge portion 53a is longer than the shortest distance from the woven fabric 10 to the hinge portion 53b. Further, it is possible to prevent the flap portion 11 rotated about the hook 3a of the retainer 3 from reaching the hinge portion 53a.

  As shown in FIG. 2, the joint 13 has a plurality of slits 14 and a gap 15 between adjacent slits 14 in a row. The slit 14 is a portion where the woven fabric 10 is cut out, and the gap 15 is a portion where the woven fabric 10 is not cut out. The woven fabric 10 is separated into the flap portion 11 and the flap portion 12 along the seam 13 at the position of the seam 13 by unraveling the woven yarn passing through the gap 15 by pressing when the airbag 8 is inflated. Each of the slits 14 includes a linear main slit 14b and sub-slits 14a and 14c connected to both ends of the main slit 14b. The main slits 14b are notches provided in a plurality on a straight line. The sub slit 14a is a notch communicating with one slit end of the main slit 14b, and the sub slit 14c is a notch communicating with the other slit end of the main slit 14b.

  FIG. 3 is a schematic view showing a state in which the woven fabric 10 is torn to the middle of the seam 13. The woven fabric 10 is woven with, for example, a plain weave of warps 17 and wefts 18. Other weaving methods such as oblique weaving and satin weaving may be used. The sub slits 14a and 14c are cut in different oblique directions with respect to the longitudinal direction of the main slit 14b so as to divide the warp 17 and the weft 18 passing through the gap 15 between the adjacent main slits 14b. The sub slit 14a is linearly formed so as to extend to one side with respect to the main slit 14b, and the sub slit 14c is formed on the other side opposite to the sub slit 14a with respect to the main slit 14b. It is formed linearly so as to extend. Even if the slit 14 is provided in the woven fabric 10, the warp yarns 17 and the weft yarns 18 are intertwined at the gap 15, so that the flap portions 11 and 12 are connected to each other at the position of the gap 15 of the seam 13.

  When the airbag 8 begins to inflate in an initial state where the warp yarn 17 and the weft yarn 18 are intertwined at the break 15, the warp 17 is located at a portion of the break 15 on the side of the sub slit 14 a with respect to a virtual extension line passing through the adjacent main slit 14 b. By detaching from the weft 18, the gap 15 is cut. By cutting all the gaps 15 in this way, the woven fabric 10 is separated into the flap portion 11 and the flap portion 12 at the joint 13.

  Note that the break 15 may be cut off when the warp 17 is removed from the weft 18 at a portion of the break 15 on the side of the sub slit 14c with respect to a virtual extension line passing through the adjacent main slit 14b.

  As described above, the seam 13 includes the adjacent main slits 14b and the auxiliary slits 14a and 14c that divide the woven yarn passing through the gap 15 between the adjacent main slits 14b. Since the seam 13 has these slits, the seam 13 is smoothly torn so as not to affect the deployment performance of the airbag 8, and the hinges 53a and 53b and the inflatable body of the airbag 8 shown in FIG. The friction with the woven fabric 10 can be easily reduced.

  Further, since the seam 13 is more easily torn than in the prior art, it is possible to easily prevent the inflation of the airbag 8 from being excessively blocked by the woven fabric 10 and the internal pressure of the airbag 8 from rising too much. Moreover, since the flap parts 11 and 12 are mutually connected by the seam 13 which is easy to tear than before, the initial rotational speed of the flap parts 11 and 12 immediately after the seam 13 is torn can be raised smoothly.

  Moreover, in the case of illustration, the woven fabric 10 is hold | maintained on the upper side of the shape maintenance sheet | seat 9 so that the airbag 8 wrapped in the shape maintenance sheet | seat 9 may be straddled. Even in such a case, since the seam 13 is easily torn, the airbag 8 expanded by breaking the shape maintaining sheet 9 at the seam 9a is excessively blocked by the woven fabric 10, and the internal pressure of the airbag 8 is increased. It is possible to prevent too much. For example, it is more effective to form the seam 13 of the woven fabric 10 with a strength that is easier to tear than the seam 9a of the shape maintaining sheet 9.

  In order to compare the ease of tearing between the seam 13 and the seam 9a, for example, in a plan view of the woven fabric 10 and the shape-retaining sheet 9, the tensile force when pulled in a direction perpendicular to the direction parallel to the extending direction of the seam It is good to measure the strength.

  FIG. 4 is a view showing an example of the operation when the airbag 8 is inflated and deployed. 4A is the initial stage of airbag inflation, FIG. 4B is the outer panel dividing stage, FIG. 4C is the door rotation stage, and FIG. 4D is the door rotation end stage. In addition, illustration of the shape maintenance sheet | seat 9 is abbreviate | omitted in FIG.

  The airbag expansion initial stage shown in FIG. 4A is a stage in which the airbag 8 expands inside the side wall 5b of the inner panel 5 and presses the inner door portion 52. The airbag 8 is inflated in a direction protruding from the retainer 3, and the woven fabric 10 is separated into the flap portion 11 and the flap portion 12 at the seam 13. And the airbag 8 contacts and presses via the inner side door part 52 and the flap part 11. FIG.

  The outer panel dividing step shown in FIG. 4B is a step in which the airbag 8 presses the outer panel 4 to divide the outer panel 4 into the fixing portions 4c and 4c and the outer door portions 4d and 4d. The flap portion 11 rotated by the pressing of the airbag 8 is interposed between the hinge portion 53a and the airbag 8 so that the airbag 8 does not directly contact the hinge portion 53a. Can be easily protected from friction. Depending on the flap length of the flap part 12, the flap part 12 rotated by the pressing of the airbag 8 is interposed between the hinge part 53b and the airbag 8 so that the airbag 8 does not directly contact the hinge part 53b. The hinge portion 53b can be easily protected from friction with the airbag 8.

  At this time, the cutout portion 4b between the one outer door portion 4d and the other outer door portion 4d is more easily divided first than the cutout portion 4b between the fixed portion 4c and the outer door portion 4d. As described above, the depth of the notch 4b and the thickness of the outer panel 4 are preferably set as appropriate. Moreover, although the outer door part 4d of the outer panel 4 is cut | disconnected from the fixing | fixed part 4c, since the inner side door part 52 is connected inside the outer side door part 4d, the outer side door part 4d does not become discrete. In addition, since the fixing | fixed part 4c is being fixed to the instrument panel 1 by the fixing member 4a, the fixing | fixed part 4c does not remove | deviate by expansion | swelling of the airbag 8. FIG.

  The door rotation stage shown in FIG. 4C is a stage in which the outer door 4d rotates toward the fixing part 4c around the hinges 53a and 53b as the airbag 8 expands. The flap portion 11 rotates around the hook 3a as a fulcrum so as to be interposed between the hinge portion 53a and the inflatable body of the airbag 8. Similarly, the flap portion 12 may be rotated around the hook 3a as a fulcrum so as to be interposed between the hinge portion 53b and the inflatable body of the airbag 8.

  At this time, the hinge portions 53a and 53b are pushed up by the expansion of the airbag 8 and extend upward. However, since the low-rigidity portion 54 such as the thin-walled portion is formed, the low-rigidity portion 54 such as the thin-walled portion is formed. It is easy to rotate from the starting point.

  The door rotation end stage shown in FIG. 4D is a stage where the inner door 4d is bent toward the fixed part 4c. Depending on the shape of the airbag 8 and the situation in the vehicle, the state shown in FIG. 4D is not always obtained. Even in such a completely folded state, the hinge portions 53a and 53b are hinges. Function. Even at this stage, the flap portion 11 may have a flap length that is interposed between the hinge portion 53a and the inflatable body of the airbag 8. The same applies to the flap portion 12.

  Next, another embodiment different from the above-described embodiment will be described. A description of the same configuration as that of the above-described embodiment is omitted.

  FIG. 5 is a schematic external view of an airbag module 110 </ b> B that is an example of the airbag module 110. 5A is a perspective view, and FIG. 5B is a front view. The plan view and the side view are the same as those in FIG.

  The retainer 3 holds the woven fabric 10 in a state where it is folded once by one hook 3a. The retainer 3 holds one end portion 10c of the woven fabric 10 before being folded back with one hook 3a, and holds the folded end portion 10d where the woven fabric 10 is folded back with the other hook 3a. . The folded end portion 10d is hooked on the other hook 3a by collecting folded portions that are overlapped by the folding. By holding the woven fabric 10 at the folded portion of the folded end portion 10d, the holding portion (folded portion of the folded end portion 10d) can be firmly held by the pressing force of the airbag 8.

  Further, as shown in FIG. 5, the retainer 3 makes the other end portion 10e of the woven fabric 10 after the woven fabric 10 is folded back at the folded end portion 10d free without being held by one hook 3a. Also good. In the case of FIG. 5, the woven fabric 10 has a seam 13 at a portion between one end portion 10c and the folded end portion 10d before the woven fabric 10 is folded at the folded end portion 10d. There is no seam at the site between the other end 10e and the folded end 10d after 10 is folded at the folded end 10d. Thereby, the flap parts 11 and 19 of the woven fabric 10 can be smoothly rotated with the folded-back end part 10d as a fulcrum while overlapping each other due to the inflation of the airbag 8. The flap portion 19 is a portion of the woven fabric 10 from the folded end portion 10d to the end portion 10e.

  FIG. 6 is a schematic external view of an airbag module 110 </ b> C that is another example of the airbag module 110. 6A is a perspective view, and FIG. 6B is a cross-sectional view in which the retainer 3 is omitted. The airbag module 110 </ b> C in FIG. 6 includes a woven fabric 60 having a seam 13. The description of the same configuration as that of the above-described embodiment is omitted or simplified.

  6A, in order to make the seam 13 formed on the woven fabric 60 held between the shape maintaining sheet 9 and the folded body of the airbag 8 easy to see, The illustration of the shoulder is omitted. 6 illustrates a configuration without the hinge protecting woven fabric 10 illustrated in FIG. 2 and the like, the woven fabric 10 may be configured in the same manner as in FIG.

  The woven fabric 60 is a belt-like member having a seam 13 that is torn by expansion of the airbag 8 and flap portions 61 and 62 that are formed by the seam 13 being torn. The woven fabric 60 is a deployment regulation sheet for regulating the deployment shape of the airbag 8. For example, the woven fabric 60 is disposed between the module cover 20 (see FIG. 1) on the upper side of the airbag 8 folded in the retainer 3, and when the airbag 8 is inflated, the vehicle body of the airbag 8 being inflated. It is an expansion | deployment control sheet | seat extended along a back side. The left side of FIG. 6B corresponds to the vehicle body rear side (occupant side), and the right side of FIG. 6B corresponds to the vehicle body front side (wind shield side). The seam 13 is provided in the intermediate portion 60b on the front side of the vehicle body with respect to the central portion in the longitudinal direction of the woven fabric 60. For example, the seam 13 is located closer to one end 60 c that is the end of the woven fabric 60 on the front side of the vehicle body than the position where the woven fabric 60 is folded above the upper portion 8 a of the airbag 8.

  Thus, when the airbag 8 is inflated, friction is generated between the rear side of the airbag 8 in the middle of inflation and the woven fabric 60 extending along the rear side of the airbag 8 in the middle of inflation. Due to the friction, the protruding speed of the airbag 8 toward the rear of the vehicle body decreases. As a result, it is possible to easily reduce friction between the inflatable body of the airbag 8 and other objects (for example, an occupant or a child seat) close to the instrument panel 1.

  The woven cloth 60 is, for example, a single cloth formed in a square shape. Further, the woven fabric 60 may be a single piece of fabric configured by joining a plurality of woven fabrics by sewing or the like. An end portion 60c on the vehicle body rear side of the woven fabric 60 is joined to an end portion 9c on the vehicle body rear side of the shape maintaining sheet 9 by stitching or the like at a joint portion 78, and an end portion 60c on the vehicle body front side of the woven fabric 60 is shaped. The holding sheet 9 is joined to the end 9c on the front side of the vehicle body by stitching or the like at a joining portion 78. This joining method is an example of the joining method of the woven fabric 60, and the joining method of the woven fabric 60 is not limited to this.

  The woven fabric 60 has a bellows portion 63 that is folded at the top portion 60a in the longitudinal direction. The bellows part 63 is formed so as to be positioned between the upper part 8 a of the folded body of the airbag 8 and the top part 9 e of the shape maintaining sheet 9. The folding shape of the bellows part 63 is not limited to the illustrated form, and may be an arbitrary form.

  A presser plate 66 is installed inside the airbag 8. The presser plate 66 is a plate-like member disposed inside the airbag 8 so as to be positioned around the mounting opening of the inflator 2 of the airbag 8, and has a stud bolt 66 a penetrating the lower portion 8 d of the airbag 8. Have.

  The end 60c on the vehicle body rear side of the woven fabric 60 and the end portion 9c on the vehicle body rear side of the shape retaining sheet 9 are fixed by stud bolts 66a on the vehicle body rear side of the presser plate 66. Ends 60c and 9c on the rear side of the vehicle body go around from the rear side of the folded body of the airbag 8 to the lower part 8d of the folded body and are locked to stud bolts 66a on the rear side of the vehicle body.

  The woven fabric 60 is routed from the vehicle body rear side of the folded body of the airbag 8 to the vehicle body front side through the upper side. The front end 60c of the woven fabric 60 and the end 9c of the shape retaining sheet 9 on the front side of the vehicle body are fixed by stud bolts 66b on the front side of the press plate 66 on the front side of the vehicle body. The end portions 60c and 9c on the front side of the vehicle body go around from the front side of the folded body of the airbag 8 to the lower portion 8d of the folded body and are locked to stud bolts 66a on the front side of the vehicle body.

  The retainer plate 66 is fastened with a predetermined nut in a state where the stud bolt 66a is inserted into a through hole formed on the bottom surface of the retainer 3, so that the retainer plate 66, together with the airbag 8, the woven fabric 60, and the shape maintaining sheet 9, are retained. 3 is fixed. That is, the lower portion 8 d of the airbag 8, the distal end of the end portion 60 c of the woven fabric 60, and the distal end of the end portion 9 c of the shape maintaining sheet 9 are sandwiched and held between the presser plate 66 and the bottom surface of the retainer 3.

  In the woven fabric 60, a seam 13 that is torn by the expansion of the airbag 8 is linearly formed along a direction that is the width direction of the vehicle when the airbag device 100 (airbag module 110) is mounted on the vehicle. ing. When the seam 13 is torn, the flap portion 62 is rotated about the one end portion 60c by being pushed by the inflated airbag 8. At the same time, when the seam 13 is torn, the flap portion 61 is pushed by the inflated airbag 8 and thereby rotates around the other end portion 60c opposite to the flap portion 62. As described above, the woven fabric 60 includes the flap portions 61 and 62 that are connected to each other adjacent to each other at the seam 13 before the seam 13 is torn, and are formed by the seam 13 being torn.

  The seam 13 includes adjacent main slits 14b and auxiliary slits 14a and 14c that divide the woven yarn passing through the gap 15 between the adjacent main slits 14b. Since the seam 13 has these slits, the seam 13 can be torn smoothly so as not to affect the deployment performance of the airbag 8. The woven fabric 60 may reduce friction between the hinge portions 53a and 53b shown in FIG.

  Further, since the seam 13 is more easily torn than in the past, it is possible to easily prevent the inflation of the airbag 8 from being excessively blocked by the woven fabric 60 and the internal pressure of the airbag 8 from being excessively increased. Moreover, since the flap parts 61 and 62 are mutually connected by the seam 13 which is easy to tear than before, the initial rotational speed of the flap parts 61 and 62 immediately after the seam 13 is torn can be raised smoothly.

  In the illustrated case, the woven fabric 60 is sandwiched and held between the shape maintaining sheet 9 and the folded body of the airbag 8. Even in such a case, since the seam 13 is easily torn, the airbag 8 is woven before the shape maintaining sheet 9 is broken at the seam 9a by the inflating body of the airbag 8 and separated into the remaining pieces 91 and 92. It is possible to prevent the internal pressure of the airbag 8 from being excessively blocked by the cloth 60. For example, it is more effective to form the seam 13 of the woven fabric 60 with a strength that is easier to tear than the seam 9a of the shape maintaining sheet 9.

  FIG. 7 is a view showing a seam 23, which is another example of a seam that is torn by inflation of the airbag 8. The joint 23 is a modification of the joint 13 shown in FIG.

  As shown in FIG. 7, the joint 23 has a plurality of slits 24 and gaps 25 between adjacent slits 24 in a row. The woven fabric 10 is separated into the flap portion 11 and the flap portion 12 at the seam 23 by unraveling the woven yarn passing through the gap 25 by pressing when the airbag 8 is inflated. Each of the slits 24 has a linear main slit 24b and sub-slits 24a and 24c connected to both ends of the main slit 24b. The main slits 24b are notches provided in a plurality of rows alternately on two parallel straight lines. The sub slit 24a is a notch communicating with one slit end of the main slit 24b, and the sub slit 24c is a notch communicating with the other slit end of the main slit 24b.

  The sub slits 24a and 24c are cut in different oblique directions with respect to the longitudinal direction of the main slit 24b so as to divide the warp 17 and the weft 18 passing through the gap 25 between the adjacent main slits 24b. In each slit 24, the sub slits 24a and 24c are linearly formed so as to extend laterally on the same side with respect to the main slit 24b. Further, in two adjacent slits 24, the sub slit 24a of one slit 24 and the sub slit 24c of the other slit 24 are formed in parallel.

  FIG. 8 is a view showing a seam 33 that is another example of a seam that is torn by inflation of the airbag 8. The joint 33 is a modification of the joint 13 shown in FIG.

  As shown in FIG. 8, the joint 33 has a plurality of slits 34 and gaps 35 between adjacent slits 34 in a row. The woven fabric 10 is separated into the flap portion 11 and the flap portion 12 at the seam 33 by unraveling the woven yarn passing through the gap 35 by pressing when the airbag 8 is inflated. Each of the slits 34 has a linear main slit 34b and sub-slits 34a and 34c connected to both ends of the main slit 34b. The main slits 34b are notches provided in a plurality on a straight line. The sub slit 34a is a notch communicating with one slit end of the main slit 34b, and the sub slit 34c is a notch communicating with the other slit end of the main slit 34b.

  The sub slits 34a and 34c are cut in different oblique directions with respect to the longitudinal direction of the main slit 34b so as to divide the warp 17 and the weft 18 passing through the gap 35 between the adjacent main slits 34b. In each slit 34, the sub slits 24a and 24c are linearly formed so as to extend laterally on both sides with respect to the main slit 24b. Further, in two adjacent slits 34, the sub slit 34a of one slit 34 and the sub slit 34c of the other slit 34 are formed in parallel.

  As mentioned above, although the airbag apparatus, the airbag module, and the woven fabric were demonstrated by the Example, this invention is not limited to the said Example. Various modifications and improvements, such as combinations and substitutions with some or all of the other embodiments, are possible within the scope of the present invention.

  For example, the panel covering the airbag is not limited to the double opening as in the above-described embodiment, but may be a single opening. Moreover, although the example which combined the some panel of the inner panel and the outer panel was shown as a panel which covers an airbag, it was comprised by one member. Further, the shape of the hinge portion is not limited to the above-mentioned U shape, and the shape of the hinge is not limited to the above shape as long as it has a hinge function.

  2, 5, and 6, an example in which the seam 13 is formed in the intermediate portions 10 b and 60 b of the woven fabrics 10 and 60 is shown, but the seam 13 is formed in the top portions 10 a and 60 a of the woven fabrics 10 and 60. It may be formed. Further, in FIG. 5, an example in which there is no seam in the portion between the folded end portion 10d and the end portion 10e is shown, but a seam similar to the seam 13 may be formed in the portion. When a seam is formed at the part, the end 10 e may be held by the hook 3 a of the retainer 3. Further, the positional relationship between the flap portions 11 and 12 and the flap portion 19 may be upside down with respect to FIG. In addition, the woven fabrics 10 and 60 are not limited to a single turn, and may be folded multiple times.

DESCRIPTION OF SYMBOLS 1 Instrument panel 1a Opening part 2 Inflator 3 Retainer 3a Hook 3b Outer side surface 3c Housing space 4 Outer panel 4a Fixing member 4b Notch part 4c Fixing part 4d Outer door part 5 Inner panel 5b Side wall 5c Locking hole 6 Connecting member 7 Car body Frame 8 Airbag 9 Shape retention sheet 9a Seam 10 Woven cloth 10a Top 10b Intermediate part 10c, 10e End part 10d Folding end parts 11, 19 Flap part (an example of the other flap part)
12 flaps (an example of one flap)
13, 23, 33 Seams 14, 24, 34 Slits 14a, 14c, 24a, 24c, 34a, 34c, Main slits 14b, 24b, 34b Sub slits 15, 25, 35 Cut 16 Attachment hole 17 Warp 18 Weft 20 Module cover 51 Support part 52 Inner door parts 53a, 53b Hinge part 54 Low rigidity part 60 Woven cloth 61 Flap part (an example of the other flap part)
62 Flap part (an example of one flap part)
78 Junction 91, 92 Remaining piece 100 Airbag device 110, 110A, 110B, 110C Airbag module

Claims (15)

An airbag,
A woven fabric that has a seam that is torn by inflation of the airbag, and a flap portion that is formed by tearing the seam, and that reduces friction between the airbag inflating body and other objects by the flap portion;
A holding part for holding the woven fabric,
The said seam is an airbag apparatus which has the adjacent main slit and the sub slit which divides | segments the woven yarn which passes between the said main slits.   The airbag device according to claim 1, wherein the woven fabric is connected to each other at the joint, and has one flap portion and the other flap portion formed by tearing the joint. The holding portion holds one end of the woven fabric before being folded and the folded end of the woven fabric so that the woven fabric straddles the airbag.
3. The airbag device according to claim 2, wherein the one flap portion rotates around the one end portion, and the other flap portion rotates around the folded end portion.   The holding unit holds the one end and the folded end without holding the other end of the woven fabric after the woven fabric is folded at the folded end. 3. The airbag device according to 3.   The woven fabric does not have the seam between the other end and the folded end, and has the seam between the one end and the folded end. The airbag apparatus as described. The holding portion holds one end of the woven fabric and the other end of the woven fabric so that the woven fabric straddles the airbag.
3. The airbag device according to claim 2, wherein the one flap portion rotates around the one end portion, and the other flap portion rotates around the other end portion.   The airbag device according to claim 6, wherein the seam is located closer to the one end portion than a position where the woven fabric is folded on the upper side of the airbag.   The airbag device according to any one of claims 1 to 7, further comprising a seam that has a seam that is torn when the airbag is inflated and wraps the airbag in a folded state.   The airbag device according to claim 8, wherein a seam of the woven fabric is easier to tear than a seam of the sheet.   The airbag device according to claim 8 or 9, wherein the woven fabric is held so as to straddle the airbag wrapped in the sheet.   The airbag device according to claim 8 or 9, wherein the woven fabric is sandwiched and held between the seat and a folded body of the airbag.   2. The airbag device according to claim 1, wherein the woven fabric blocks contact between an inflatable body of the airbag and a hinge portion of a panel that covers the airbag by the flap portion.   The airbag device according to claim 1, wherein the woven fabric regulates a deployed shape of the airbag.   The airbag apparatus of Claim 1 provided with the gas generator which inflates the said airbag. A woven fabric having a seam and a flap portion formed by tearing the seam, and reducing friction between an airbag inflatable body and another object by the flap portion,
The seam is a woven fabric having adjacent main slits and sub-slits for dividing a woven yarn passing between the main slits.

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