JP6034762B2 - Method for manufacturing curtain airbag device - Google Patents

Description

The present invention relates to a method for manufacturing a curtain airbag device attached to a roof side rail of a vehicle.

  As an airbag device for a vehicle, in order to prevent an occupant's head from crashing into a side window or the like in the event of an accident from the side, an airbag is deployed from the roof side rail of the vehicle in a curtain shape. Are known. Such an airbag device is also referred to as a curtain airbag device.

  In the curtain airbag device, the airbag is attached along the roof side rail in a state of being folded into an elongated shape. Further, a protective cover for protecting the airbag from above is disposed between the airbag and the roof side rail. The protective cover is for preventing the airbag from being damaged by hitting the roof side rail or the like.

  In general, a curtain airbag device before being attached to a vehicle has an airbag folded in a slender shape and a protective cover. For example, a curtain airbag device is delivered to a vehicle manufacturer in a state where an airbag and a protective cover are integrated. In the vehicle manufacturer, the airbag and the protective cover are not separated from each other but are attached to the vehicle at the same time while being integrated (see Patent Document 1 below).

  Various methods can be used as a method of integrating the airbag and the protective cover, in other words, as a method of fixing the folded airbag to the protective cover. Among them, the simplest and most commonly performed is by winding an adhesive tape. An adhesive tape is wound around the airbag and the protective cover at a plurality of locations along the longitudinal direction (so as to surround both), thereby fixing them together.

  In the curtain airbag device having such a configuration, a part of the surface of the airbag that is exposed to the outside is adhesively fixed with an adhesive tape. This not only prevents the airbag from being removed from the protective cover, but also prevents the airbag from rotating in the circumferential direction with respect to the protective cover. That is, the airbag is prevented from being twisted inside the protective cover.

  Further, even after the curtain airbag device is attached to the vehicle, the adhesive tape prevents part of the airbag from being separated from the protective cover. When the airbag is deployed, the adhesive tape is easily cleaved, so that the adhesive tape does not hinder the deployment of the airbag.

  By the way, the airbag of the curtain airbag device is required to maintain a high internal pressure for a while after deployment. For this reason, the coating (for example, silicon coating) for preventing the leakage of gas is applied to the airbag. Conventionally, such a coating has been generally applied to the inner surface side (the inner side of the bag) of the airbag.

JP 2011-46349 A

  In recent years, it has been proposed and put into practical use to form a bag-like airbag by spinning using OPW (One-Piece Waven). Such an airbag can be easily manufactured as compared with a case in which two base fabrics are sewn on the front and back. In addition, there are many advantages such as a high-quality air bag without seams, and its spread has already begun.

  Since the airbag formed by OPW is already in a bag shape when the spinning is completed, the inner surface side (the inner side of the bag) cannot be coated. For this reason, after spinning is completed, it is necessary to coat the outer surface side (outside of the bag). As a result, when the pressure-sensitive adhesive tape is wound and the airbag and the protective cover are integrated, the pressure-sensitive adhesive surface of the pressure-sensitive adhesive tape hits the coated surface of the airbag.

  However, a coated surface (for example, a surface covered with silicon) has very weak adhesion to an adhesive tape. For this reason, it is prevented that the airbag is detached from the protective cover by the adhesive tape, but the airbag is not prevented from rotating in the circumferential direction with respect to the protective cover. Therefore, in the curtain airbag device using the airbag formed by OPW, the airbag may be twisted inside the protective cover, and the curtain airbag device may be attached to the vehicle while being twisted. was there.

  The present invention has been made in view of such problems, and an object thereof is to provide a curtain airbag device that can prevent the airbag from rotating and twisting in the circumferential direction with respect to the protective cover. There is to do.

  In order to solve the above problems, a curtain airbag device according to the present invention is a curtain airbag device that is attached to a roof side rail of a vehicle, and includes an airbag folded in an elongated state, and the airbag. A protective cover disposed between the roof side rail and the airbag and a part along the longitudinal direction of the airbag so as to protect both the airbag and the protective cover from the outside. And an adhesive tape that is wound around and is adhered to these, and the airbag has a coating for preventing gas leakage on substantially the entire surface when deployed. And at least a portion of the surface of the airbag to which the adhesive tape adheres has a viscosity to the adhesive tape. For improving than sexual other portions, it is characterized in that the adhesive-improving treatment is applied.

  A curtain airbag device according to the present invention is a safety device attached to a roof side rail of a vehicle, and includes an airbag, a protective cover, and an adhesive tape. The air bag is deployed in a curtain shape from the roof side rail to protect the head of the occupant when an accident occurs from the side. In a normal state, the airbag is folded so as to be elongated, and is arranged so that its longitudinal direction follows the roof side rail. Moreover, the coating for preventing the leakage of gas is given to the substantially whole surface when the airbag is deployed.

  The protective cover protects the airbag. The protective cover is disposed between the roof side rail and the airbag. For this reason, when the airbag is deployed, the airbag is prevented from being damaged by hitting the roof side rail or the like.

  The adhesive tape is wound around a part of the airbag in the longitudinal direction so as to surround both the airbag and the protective cover from the outside. Of the adhesive tape, the surface facing the airbag and the protective cover is an adhesive surface. For this reason, the adhesive tape is in a state of being adhered to both the airbag and the protective cover.

  At least a part to which the adhesive tape adheres is applied to the surface of the airbag. An adhesive improvement process is a process for improving the to-be-adhered property with respect to an adhesive tape rather than another part. For this reason, for example, a silicon coat is applied to the surface, and the adhesiveness to the adhesive tape is reduced (it is difficult to adhere to the adhesive surface of the adhesive tape). It can be set in a state where it is relatively strongly adhered and fixed by the tape. As a result, it is suppressed that the airbag rotates in the circumferential direction with respect to the protective cover and becomes twisted.

  Moreover, in the curtain airbag device according to the present invention, the portion of the surface of the airbag to which the adhesive tape adheres includes a portion that is near the end of the protective cover along the longitudinal direction. Is also preferable.

  In this preferred embodiment, the location where the adhesive tape adheres on the surface of the airbag, that is, the location where the adhesive improvement treatment has been performed, includes a location that is near the end of the protective cover along the longitudinal direction. Yes. In other words, when the adhesive improvement process is performed at a plurality of locations of the airbag, the plurality of locations include at least a location near the end of the protective cover. Since the rotation (twist) of the airbag is suppressed by the adhesive tape in the portion near the end of the protective cover, the twist of the airbag is caused outside the protective cover (the portion where the protective cover is not disposed above). Can only occur. In other words, it is possible to suppress the twisting of the airbag in the portion that is covered with the protective cover and is difficult to visually recognize. For this reason, it is possible to further prevent the curtain airbag device from being attached to the vehicle while the airbag is twisted.

  In the curtain airbag device according to the present invention, the airbag is preferably formed of OPW (One Piece Waven).

  In this preferred embodiment, the airbag is formed of OPW. For this reason, an airbag can be manufactured more easily than the case where two base fabrics are sewn on the front and back. Moreover, it can be set as the high quality airbag without a seam.

  Moreover, in the curtain airbag device according to the present invention, the non-coated cloth piece is disposed in the tacky improvement process so as to cover a part of the surface of the coated airbag. A treatment is also preferred.

  In this preferable embodiment, the adhesion improving process is a process of arranging a piece of cloth not coated so as to cover a part of the surface of the coated airbag. The portion of the air bag surface that is touched by the adhesive tape is in a state of being covered with a piece of cloth (as an adhesion improving process). Moreover, the coating is not given to the surface which an adhesive tape contacts at least among the cloth pieces. For this reason, the piece of cloth covering the surface of the airbag is relatively strongly adhered and fixed by the adhesive tape. As a result, it is suppressed that the airbag rotates in the circumferential direction with respect to the protective cover and becomes twisted.

  Moreover, in the curtain airbag device according to the present invention, the cloth piece includes both a first surface facing the vehicle interior when deployed and a second surface facing the vehicle exterior when deployed. It is also preferable that the central portion is sewn in the vicinity of the upper end of the airbag so that the airbag is disposed over the airbag.

  The curtain-shaped airbag in the deployed state has a first surface facing the vehicle interior and a second surface facing the vehicle exterior. When such an airbag is folded in a roll shape, only one of the first surface and the second surface is exposed to the outside, and the other surface is not exposed to the outside. In other words, when the folded airbag and the protective cover are integrated, the adhesive tape hits only one of the first surface and the second surface. Therefore, it is conceivable that only one of the first surface and the second surface is covered with the cloth piece as the adhesive improvement treatment.

  Incidentally, the curtain airbag device is disposed on both the left and right sides of the vehicle. The pair of curtain airbag devices are symmetrical to each other. For this reason, the winding directions when the airbag is folded into a roll shape are different from each other.

  Therefore, the winding direction when the airbag is folded differs depending on whether the airbag is arranged on the left or right side of the vehicle. For this reason, in the case where only one of the first surface and the second surface is covered with a cloth piece, the cloth covered piece is folded inside so that the cloth piece is exposed to the outside. It is also possible that the situation will not occur. Such an error may be caused by mistaken arrangement of the cloth pieces, or may be caused by mistaken winding directions when the airbag is folded into a roll shape. In such a case, since the adhesive tape does not hit the cloth piece, the airbag cannot be twisted.

  In this preferred embodiment, the cloth piece is arranged over both the first surface of the airbag that faces the vehicle inner side when deployed and the second surface that faces the vehicle outer side when deployed. The central portion is sewn near the upper end of the airbag. In a state before the airbag is folded (may be referred to as an unfolded state), the cloth piece is in a state in which a part near the upper end of the airbag is sandwiched from both the vehicle inner side and the vehicle outer side.

  With such a configuration, it is possible to cover the surface of the folded airbag that is exposed to the outside with a piece of cloth, regardless of which direction the winding direction of the airbag is folded into a roll. That is, it is possible to reliably prevent twisting of the airbag by performing the adhesion improving process at a correct position.

  In the curtain airbag device according to the present invention, it is also preferable that the length of the cloth piece along the circumferential direction of the folded airbag is equal to or greater than the circumference of the airbag.

  In this preferable aspect, the length of the cloth piece along the circumferential direction of the folded airbag is not less than the circumference of the airbag. In other words, the length of the portion extending along the first surface from the portion sewn to the upper end of the airbag, and the second surface from the portion sewn to the upper end of the airbag. The length of the extending portion is at least half the circumference of the folded airbag.

  For this reason, in the portion of the curtain airbag device where the adhesive tape is wound, a piece of cloth is interposed between the airbag and the protective cover, and the piece of cloth is also interposed between the airbag and the adhesive tape. Intervene. As a result, a large frictional force is applied to the airbag from the cloth piece, and the airbag can be further prevented from being twisted.

  Moreover, in the curtain airbag device according to the present invention, when the fabric piece forms the airbag by OPW (One Piece Woven), an additional bag portion is further provided above the upper end portion of the airbag. It is also preferable that the additional bag portion is formed and formed by cutting away the part of the additional bag portion.

  In this preferable aspect, when forming an airbag by OPW, the method of forming a cloth piece is devised. First, an additional bag portion is formed further above the upper end portion of the airbag. That is, the airbag and the additional bag portion are formed in a state where they are connected as a single textile made of OPW.

  Subsequently, a piece of cloth is formed by cutting off the additional bag portion while leaving a part thereof. The cloth piece (the remaining part of the additional bag part) is connected to the upper part of the airbag at its lower end. Since the cloth piece is connected to the airbag as a single textile body, the cloth piece is firmly connected as compared with the case where a separate cloth piece is sewn.

  Further, the piece of cloth formed as described above covers a part of the surface of the airbag. At this time, the surface of the fabric piece exposed to the outside (the surface not facing the surface of the airbag) is the portion that was on the inner surface side of the additional bag portion, and thus the surface is coated. Not. For this reason, the adhesiveness with respect to an adhesive tape improves rather than another part among airbags. As described above, according to this preferable aspect, it is possible to easily and firmly form the piece of cloth covering a part of the airbag as the adhesion improving process.

  ADVANTAGE OF THE INVENTION According to this invention, the curtain airbag apparatus which can prevent that an airbag rotates in the circumferential direction with respect to a protective cover and twists can be provided.

It is a figure which shows the state which attached the curtain airbag apparatus which concerns on one Embodiment of this invention to the vehicle. FIG. 2 is an exploded view for explaining the configuration of the curtain airbag device shown in FIG. 1. It is a figure which shows the structure of the curtain airbag apparatus shown in FIG. It is a figure which shows the airbag of the curtain airbag apparatus shown in FIG. It is a figure which shows the cover cloth attached to the upper end of the airbag shown in FIG. It is a figure which shows typically the state by which the cover cloth shown in FIG. 5 was attached to the upper end of the airbag shown in FIG. It is a figure which shows typically the cross section of the curtain airbag apparatus in the state shown in FIG. It is a figure for demonstrating the manufacturing method of the airbag used for the curtain airbag apparatus which concerns on other embodiment of this invention.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  A curtain airbag device according to an embodiment of the present invention will be described with reference to FIG. FIG. 1A is a view of the curtain airbag device AA attached to the right side in the traveling direction of the vehicle C as viewed from the vehicle interior side. FIG. 1B is a perspective view illustrating a state in which the airbag 10 is deployed by operating the curtain airbag device AA from the state of FIG. In FIG. 1, the x-axis is set with the direction from the front to the rear of the vehicle C as the x direction, the y-axis is set with the direction from the bottom to the top of the vehicle C as the y direction, and from the right side in the traveling direction of the vehicle C. The z axis is set with the direction toward the left in the traveling direction as the z direction. In the subsequent drawings, the x axis, the y axis, and the z axis are similarly set.

  The curtain airbag device AA is a device that deploys the airbag 10 in the vicinity of the side window of the vehicle C. Although all the embodiments will be described as a curtain airbag device for the right side in the traveling direction of the vehicle C, the curtain airbag device for the left side in the traveling direction of the vehicle C has a similar and symmetric structure.

  As shown to FIG. 1 (A), curtain airbag apparatus AA is accommodated in the vehicle compartment side surface upper direction. The curtain airbag device AA is attached to the roof side rail SL of the vehicle C. A plurality of pillars are provided in the vehicle C, and are provided in order from the front as an A pillar AP, a B pillar BP, a C pillar CP, and a D pillar DP. The inner sides of the A pillar AP, B pillar BP, C pillar CP, and D pillar DP are covered with a pillar trim formed of resin or the like. In the case of this embodiment, the curtain airbag device AA is provided from the A pillar AP to the D pillar DP.

  The curtain airbag device AA includes an airbag 10, a protective cover 20, and an inflator 30. The airbag 10 is formed into a bag shape by spinning using an OPW (One-Piece Waven). That is, it is not formed into a bag shape by sewing two base fabrics on the front and back, but the airbag 10 which is a bag-like fabric from the beginning is directly formed by spinning.

  The entire surface of the airbag 10 (the entire surface exposed to the outside in the deployed state) is provided with a silicon coating for preventing gas leakage immediately after deployment. For this reason, the internal pressure of the airbag 10 is kept high for a while after deployment.

  In FIG. 1 (A), the airbag 10 is folded (rolled) into a roll and is in an elongated state, and is attached so that its longitudinal direction is along the longitudinal direction (x direction) of the vehicle C. Yes.

  The protective cover 20 is a plate-like cover formed by resin injection molding, and is disposed between the airbag 10 and the roof side rail SL. The protective cover 20 protects the airbag 10 from above and from the side in order to prevent the airbag 10 from being damaged by hitting the roof side rail SL or the like. The protective cover 20 plays a role of regulating the deployment direction of the airbag 10 in addition to the role of protecting the airbag 10 from above.

  The protective cover 20 is divided into a plurality along the longitudinal direction of the vehicle C. In the present embodiment, the two protective covers 21 and 22 attached so as to be aligned along the front-rear direction of the vehicle C protect the airbag 10 from above.

  The inflator 30 is a cylinder-type inflator and supplies inflation gas to the airbag 10 from a suitably determined position at the upper end of the airbag 10. When a side collision or rollover (rollover) occurs in the vehicle C, the inflator 30 is configured to operate. Specifically, when a side collision or rollover occurs, a sensor (not shown) provided in the vehicle C senses an impact and transmits an ignition signal to the inflator 30. Then, the explosive in the inflator 30 burns, and the generated inflation gas is supplied to the airbag 10.

  The configuration of the curtain airbag device AA will be further described with reference to FIG. FIG. 2 is an exploded view for explaining the configuration of the curtain airbag device AA. 2, the curtain airbag device AA in the state shown in FIG. 1A, that is, in a state where the airbag 10 is folded long and narrow (a state where the airbag 10 is not deployed) is shown in an exploded manner.

  In the airbag 10, five fixing tabs 110 (111 to 115) are provided at the upper position in the folded state (in the present embodiment, equal to the upper position in the deployed state). It is formed so as to be aligned along the front-rear direction of C. Each fixing tab 110 is a substantially rectangular cloth piece made of the same material as the airbag 10 and is formed integrally with the airbag 10 during OPW spinning. The fixing tab 110 protrudes upward from the upper surface of the airbag 10. Each fixing tab 110 is arranged so as to be substantially parallel to the front-rear direction (x direction) of the vehicle C. In other words, all the fixing tabs 110 are arranged such that the normal direction thereof is along the z direction.

  Each fixing tab 110 is formed with a through hole HL1 so as to penetrate the substantially center thereof. In the roof side rail SL to which the curtain airbag device AA is attached, insertion holes are formed at positions corresponding to the respective through holes HL1. When the curtain airbag device AA is attached, the resin clips CL are inserted into the through holes HL1 and the insertion holes from the vehicle inner side (in the −z direction) in a state where the through holes HL1 and the insertion holes are overlapped. As a result, each fixing tab 110 is fixed to the roof side rail SL.

  A fixing plate 201 protruding upward is formed at a position corresponding to the fixing tab 112 in the protective cover 21. The fixing plate 201 is a substantially rectangular plate that is slightly larger than the fixing tab 112, and a through hole HL2 is formed so as to penetrate the substantially center thereof. When fixing the fixing tab 112 to the roof side rail SL, the fixing plate 201 is overlapped on the outside (−z direction side) of the fixing tab 112, and the through hole HL1 of the fixing tab 112 and the through hole of the fixing plate 201 are set. The clip CL is inserted from the vehicle inner side (toward the −z direction) so as to penetrate the insertion holes of the HL2 and the roof side rail SL.

  Further, a fixing plate 202 protruding upward is formed at a position corresponding to the fixing tab 113 in the protective cover 21. The fixing plate 202 is a substantially rectangular plate that is slightly larger than the fixing tab 113, and a through hole HL2 is formed so as to penetrate the substantially center thereof. When fixing the fixing tab 113 to the roof side rail SL, the fixing plate 202 is overlapped on the outside (−z direction side) of the fixing tab 113, and the through hole HL 1 of the fixing tab 113 and the through hole of the fixing plate 202 are set. The clip CL is inserted from the vehicle inner side (toward the −z direction) so as to penetrate the insertion holes of the HL2 and the roof side rail SL.

  Thus, the protective cover 21 is fixed to the roof side rail SL by the clip CL.

  The fixing of the protective cover 22 has the same configuration. A fixing plate 221 that protrudes upward is formed at a position corresponding to the fixing tab 114 in the protective cover 22. The fixing plate 221 is a substantially rectangular plate that is slightly larger than the fixing tab 114, and a through hole HL2 is formed through the fixing plate 221. When the fixing tab 114 is fixed to the roof side rail SL, the fixing plate 221 is overlapped on the outside (−z direction side) of the fixing tab 114, and the through hole HL1 of the fixing tab 114 and the through hole of the fixing plate 221 are set. The clip CL is inserted from the vehicle inner side (toward the −z direction) so as to penetrate the insertion holes of the HL2 and the roof side rail SL.

  Thus, the protective cover 22 is also fixed to the roof side rail SL by the clip CL.

  In the upper part of the airbag 10, the inflator 30 is inserted into the rear side of the fixing tab 113 arranged at a substantially central position in the front-rear direction, and the gas from the inflator 30 is supplied to the airbag 10. An introduction part 120 which is a part for leading to the inside is formed. The introduction part 120 is a cylindrical cloth piece made of the same material as the airbag 10 and is formed integrally with the airbag 10 during OPW spinning. As a result, it protrudes upward from the upper surface of the airbag 10. The cylindrical introduction portion 120 communicates with the interior of the airbag 10. An opening 121 is formed at the upper end of the introduction part 120.

  The tip of the inflator 30, that is, the portion on the injection port 31 side of the inflation gas is inserted from the opening 121 toward the inside of the introduction portion 120. The space between the outer peripheral surface of the inflator 30 and the inner surface of the introduction portion 120 is hermetically sealed. For this reason, when the inflation gas is injected from the inflator 30, almost all of the inflation gas is supplied to the inside of the airbag 10 without flowing out to the outside.

  The protective cover 21 and the protective cover 22 are separated from each other. The introduction part 120 and the inflator 30 are disposed between the protective cover 21 and the protective cover 22.

  FIG. 3 is a diagram showing the configuration (after assembly) of the curtain airbag device AA as described above. As shown in FIG. 3, adhesive tape TP (TP1 to TP6) is wound around the curtain airbag device AA at six locations aligned along the longitudinal direction. Each adhesive tape TP is wound so as to surround both the airbag 10 and the protective cover 20 from the outside. The adhesive tape TP is wound with its adhesive surface facing inward. For this reason, the airbag 10 and the protective cover 20 are both adhesively fixed by the adhesive tape TP.

  With such an adhesive tape TP, before the curtain airbag device AA is attached to the vehicle C, for example, even when it is delivered from the airbag manufacturer to the vehicle manufacturer, the airbag 10 and the protective cover 20 are separated, It is possible to prevent the two positions from being displaced relative to each other.

  In particular, a part of the airbag 10 rotates along the circumferential direction, and the airbag 10 is prevented from being twisted inside the protective cover 20. As a result, the curtain airbag device AA is attached to the vehicle C while the airbag 10 is twisted, and the airbag 10 is prevented from being appropriately deployed when an accident occurs.

  As shown in FIG. 3, the positions where the adhesive tape TP is wound along the longitudinal direction of the airbag 10 (six locations) include positions near the ends of the protective covers 21 and 22. Yes. That is, the adhesive tape TP1 is wound around the position that becomes the front end portion of the protective cover 21, and the adhesive tape TP3 is wrapped around the position that becomes the rear end portion of the protective cover 21. In addition, an adhesive tape TP4 is wound around a position that becomes the front end portion of the protective cover 22, and an adhesive tape TP6 is wrapped around a position that becomes the rear end portion of the protective cover 22. The adhesive tape TP is wound around six places including such a position, and the twist of the airbag 10 at each position is suppressed.

  As a result, the airbag 10 can be twisted only on the outer sides of the protective covers 21 and 22 (portions of the airbag 10 where the protective covers 21 and 22 are not disposed above). In other words, it is possible to prevent the airbag 10 from being twisted in a portion that is covered with the protective covers 21 and 22 and is difficult to visually recognize. Therefore, the curtain airbag device AA is prevented from being attached to the vehicle C while the airbag 10 is twisted.

  On the other hand, the portion of the airbag 10 that is exposed between the protective cover 21 and the protective cover 22 (the portion between the adhesive tape TP3 and the adhesive tape TP4) may be twisted during transportation or work. There is sex. However, since the portion is relatively narrow, it is unlikely that the curtain airbag device AA is attached to the vehicle C without the operator noticing the twist of the airbag 10 generated in the portion.

  Further, when the airbag 10 is twisted at a portion between the protective cover 21 and the protective cover 22, the positions of the fixing tab 113 and the fixing plate 202 are moved to the rear side and formed on the roof side rail SL. It will shift from the position of the insertion hole. For this reason, it becomes difficult to insert the clip CL so as to penetrate the through hole HL1 of the fixing tab 113 or the like. Thereby, the operator can recognize that the airbag 10 is twisted.

  By the way, the surface of the airbag 10 is coated with silicon, and the adherence to the adhesive tape TP is reduced (it is difficult to adhere to the adhesive surface of the adhesive tape TP). For this reason, the above effect of preventing the twist of the airbag 10 by the adhesive tape TP seems to be small.

  However, in this embodiment, the adhesive improvement process is performed with respect to the part which the adhesive tape contacts among the surfaces of the airbag 10, and, thereby, the adhesiveness to the adhesive tape TP is improved. Specifically, a portion of the surface of the airbag 10 to which the silicone coating is applied is covered with a cover cloth 300 that is highly adhesive to the adhesive tape TP.

  The configuration and arrangement of the cover cloth 300 will be described. FIG. 4 shows the airbag 10 in a deployed state. As shown in FIG. 4, each cover cloth 300 is disposed so as to cover the vicinity of the position to be the upper end of the airbag 10 from above. The position where the cover cloth 300 is arranged in the longitudinal direction of the airbag 10 (the x direction in FIG. 4) corresponds to the position where the adhesive tape TP is wound.

  FIG. 5 is a diagram illustrating the shape of the cover cloth 300. As shown in FIG. 5, the cover cloth 300 is a substantially rectangular piece of cloth, and is formed of the same material as the cloth forming the airbag 10. However, the cover cloth 300 is not subjected to silicon coating. The six cover cloths 300 (301 to 306) all have the same material and the same shape.

  The cover cloth 300 has a slit S formed at the center thereof. In other words, the cover cloth 300 includes two cloth pieces (first cloth piece 310 and second cloth piece 320) connected with the slit S interposed therebetween. The cover cloth 300 can be bent along the slit S so that the first cloth piece 310 and the second cloth piece 320 face each other.

  FIG. 6 is a diagram schematically illustrating a state in which the cover cloth 300 is attached to the upper end of the airbag 10. FIG. 6 can be said to be a diagram schematically depicting the airbag 10 in the state shown in FIG. 4 while looking along the x direction.

  As shown in FIG. 6, the cover cloth 300 is arranged so as to cover the airbag 10 from above in a state of being folded along the slit S. The first cloth piece 310 of the cover cloth 300 is arranged along the first surface Sa <b> 1 that is the vehicle inner side (z direction side) of the airbag 10 when deployed. Further, the second cloth piece 320 of the cover cloth 300 is disposed along the second surface Sa <b> 2 that is the vehicle outer side (−z direction side) of the airbag 10 during deployment.

  The cover cloth 300 has a central portion (near the slit S) sewn to the vicinity of the upper end of the airbag 10. In other words, the first cloth piece 310 and the second cloth piece 320 are sewn to the airbag 10 in the vicinity of their upper ends. On the other hand, a portion other than the upper end of the first cloth piece 310 and a portion other than the upper end of the second cloth piece 320 are not sewn to the airbag 10 and are only hanging from above. It has become. Both the length of the first cloth piece 310 that hangs downward (the length along the y direction) and the length of the second cloth piece 320 are the circumference of the cross section of the airbag 10 in the folded state. Is approximately equal to half of Therefore, the entire length of the cover cloth 300 along the vertical direction in FIG. 5 is substantially equal to the circumference.

  The position where the cover cloth 300 is sewn to the airbag 10 is only near the upper end of the airbag 10 as described above. Specifically, the non-inflatable portion of the airbag 10, that is, a portion that is not a portion where two cloth bodies overlap so as to form a bag, but a portion that is a single cloth body at the upper end The cloth 300 is sewn. For this reason, the two cloth bodies are sewn together with the cover cloth 300, so that the deployment of the airbag 10 is not hindered.

  The airbag 10 shown in FIGS. 4 and 6 is folded together with the cover cloth 300 in a roll shape, and then fixed to the protective cover 20 with an adhesive tape TP as shown in FIG. FIG. 7 is a cross-sectional view of the curtain airbag device AA shown in FIG. 3, schematically showing a cross section perpendicular to the longitudinal direction (x direction) of the airbag 10. FIG. 7 shows a cross section in the vicinity of the cover cloth 301 in the curtain airbag device AA, but the same applies to the cross sections in the vicinity of the other cover cloths (302 to 306).

  As shown in FIG. 7, the airbag 10 folded in a roll shape is in a state in which substantially the entire outer periphery (the entire circumferential direction) is covered with the first cloth piece 310 of the cover cloth 301. . On the other hand, the second cloth piece 320 of the cover cloth 301 is wound inside the airbag 10 and is not exposed to the outside.

  As already described, the adhesive tape TP1 is wound so as to surround both the airbag 10 and the protective cover 21 from the outside. The adhesive surface of the adhesive tape TP1 is adhered to the entire outer surface of the protective cover 21 (the surface opposite to the surface facing the airbag 10). Further, the first cloth piece 310 covering the airbag 10 is also adhered. Since the first cloth piece 310 is not coated with silicon, the first cloth piece 310 is adhesively fixed with a relatively strong force. As a result, the movement of the first cloth piece 310 along the circumferential direction of the airbag 10 is suppressed. In addition, a strong frictional force is applied between the first cloth piece 310 and the surface of the airbag 10, and the twisting of the airbag 10 is suppressed by the frictional force.

  Further, as shown in FIG. 7, the first cloth piece 310 is also interposed between the protective cover 21 and the airbag 10. As a result, a large frictional force is also applied to the portion of the airbag 10 and the twist of the airbag 10 is further suppressed.

  In the curtain airbag device for the left side in the traveling direction of the vehicle C, the winding direction of the airbag 10 is opposite to that shown in FIG. As a result, the outer periphery of the airbag 10 is covered with the second cloth piece 320, and the first cloth piece 310 is wound inside the airbag 10 and is not exposed to the outside. As described above, in this embodiment, the outer peripheral surface of the folded airbag 10 can be covered with the cover cloth 300 even when the airbag 10 is wound in any direction. As a result, the cover cloth 301 can be reliably disposed at the portion where the adhesive surface of the adhesive tape TP1 hits.

  In addition, as an adhesive improvement process performed with respect to the part which the adhesive tape TP hits on the surface of the airbag 10, the process of various aspects other than the above is considered. For example, the adhesiveness to the adhesive tape TP in the part may be increased by applying another coating to the outer peripheral surface of the airbag 10 to which the silicon coating is applied.

  Next, a curtain airbag device AAa according to another embodiment of the present invention will be described with reference to FIG. The curtain airbag device AAa differs from the curtain airbag device AA only in the manufacturing method of the airbag 10a. Therefore, only the manufacturing method of the airbag 10a will be described below, and other detailed description will be omitted.

  First, the textile body 180a is formed by spinning using OPW. As shown in FIG. 8A, the textile body 180a has a bag-like additional bag portion 190a formed on the upper side of the portion that will later become the airbag 10a. The shape of the airbag 10a is equal to the shape of the airbag 10 excluding the cover cloth 300.

  Subsequently, the additional bag portion 190a is cut out from the textile body 180a while leaving the portion indicated by the dotted line AR1 in FIG. As a result, as shown in FIG. 8B, two cloth pieces (a first cloth piece 310a and a second cloth piece 320a) are arranged on the upper end portion of the airbag 10a so that their lower sides coincide with each other. It will be in the state connected by. The first cloth piece 310a has substantially the same shape as the first cloth piece 310 in the airbag 10, and is formed at substantially the same position. Similarly, the second cloth piece 320a has substantially the same shape as the second cloth piece 320 in the airbag 10, and is formed at substantially the same position.

  In addition, although illustration is abbreviate | omitted in FIG. 8, the cloth piece similar to the 1st cloth piece 310a and the 2nd cloth piece 320a is formed in the other part among the upper ends of the airbag 10a. The shape and position of these cloth pieces are the same as those of the plurality of cover cloths 300 in the airbag 10.

  As shown in FIG. 8C, the upper end portion of the airbag 10a is covered with the first cloth piece 310a and the second cloth piece 320a. At this time, the surface exposed to the outside (the surface not facing the surface of the airbag 10a) of these pieces of cloth is the portion that was the inner surface side of the additional bag portion 190a. No coating is applied. For this reason, the adherence to the adhesive tape TP is improved as compared with other portions of the airbag 10a.

  As described above, in the airbag 10a formed by the method as described above, a piece of cloth covering a part of the airbag 10a is easily and firmly formed as the adhesion improvement process.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention. For example, the length of the first cloth piece 310 and the length of the second cloth piece 320 along the circumferential direction of the folded airbag 10 are both the circumference of the folded airbag 10 in this embodiment. About half. However, it may of course be longer. For example, each may be substantially equal to the circumference of the folded airbag 10. In this case, the entire length of the first cloth piece 310 and the second cloth piece 320 is about twice the circumference.

AA, AAa: curtain airbag device CL: clip 10, 10a: airbag 180a: textile 190a: additional bag part Sa1: first surface Sa2: second surface HL1: through hole 110 (111, 112, 113, 114, 115): Fixing tab 120: Introduction part 121: Opening 300 (301, 302, 303, 304, 305, 306): Cover cloth 310, 310a: First cloth piece 320, 320a: Second cloth piece S: Slit TP ( TP1, TP2, TP3, TP4, TP5, TP6): Adhesive tape 20 (21, 22): Protective cover 201, 202, 221: Fixing plate HL2: Through hole 30: Inflator 31: Injection port C: Vehicle AP, BP, CP, DP: Pillar SL: Roof side rail

Claims (7)

And an air bag which is folded so as to be fine-long state,
A protective cover disposed between the roof side rail of the vehicle and the airbag so as to protect the airbag;
A part of the airbag along the longitudinal direction thereof, the adhesive tape being wound around the airbag and the protective cover so as to surround both from the outside and being in a state of being adhered thereto A curtain airbag device manufacturing method comprising:
Wherein the air bag, and facilities the coating to prevent leakage of gas to substantially the entire surface at the time of the deployment,
At least in part of the adhesive tape to stick out of the surface of the airbag, curtain, characterized in that to facilities of the adherend-improving treatment to improve than other portions of the adhesion to the adhesive tape Manufacturing method of airbag apparatus. The location where the said adhesive tape adheres among the surfaces of the said airbag contains the location used as the edge part vicinity of the said protective cover along the said longitudinal direction. Manufacturing method of curtain airbag device. The method for manufacturing a curtain airbag device according to claim 1, wherein the airbag is formed by OPW (One Piece Waven). The adhesiveness improving process is a process of arranging a piece of cloth not coated with the coating so as to cover a part of the surface of the airbag coated with the coating. The manufacturing method of the curtain airbag apparatus as described in any one of 1-3. The cloth piece is
Near the upper end of the airbag so as to be disposed over both the first surface facing the vehicle interior when deployed and the second surface facing the vehicle exterior when deployed. The method for manufacturing a curtain airbag device according to claim 4, wherein the central portion is sewn. 6. The method of manufacturing a curtain airbag device according to claim 5, wherein a length of the cloth piece along a circumferential direction of the folded airbag is equal to or greater than a circumference of the airbag. The cloth piece is
When forming the airbag by OPW (One Piece Woven), an additional bag portion is formed further above the upper end portion of the airbag,
The method for manufacturing a curtain airbag device according to any one of claims 4 to 6, wherein the additional bag portion is formed by cutting out a part of the additional bag portion.

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