JP6647066B2 - Wrapping material - Google Patents

Description

  The present invention relates to a wrapping member provided with a holding member for holding a folded state of an airbag.

  2. Description of the Related Art Conventionally, for example, an airbag device provided on a steering wheel, which is a steering wheel of an automobile, or an instrument panel unit has been known. This airbag device includes an inflator for supplying gas and a bag-shaped airbag folded into a predetermined shape. The airbag is stored in a case body while being held in a folded shape by a holding member formed of a base cloth or the like and held by a retainer to which the inflator is attached. In the event of an automobile collision or the like, gas is supplied from an inflator to inflate and deploy the airbag in front of the occupant, thereby reducing the impact applied to the occupant.

  The holding member that holds the folded shape of the airbag is formed, for example, in a cross shape having four arms by a single base cloth, and has a fixing portion that is fixed to a retainer at the tip of the arm, A configuration having a slit for deploying an airbag at the base end of the portion (see, for example, Patent Document 1), and a substantially square shape made of one base cloth, and each corner and each side A configuration is known in which a fixing portion for fixing to a retainer is protruded at a central portion and a slit for deploying an airbag is provided at the central portion (for example, see Patent Document 2).

JP 2013-244937 A (Page 5-6, FIG. 1-4) JP 2007-15542 A (page 4-7, FIG. 7)

  In the case of the configuration described in Patent Literature 1, since a load is applied only in the direction of the arm connecting each slit and each fixing portion, the folded airbag is held in a smaller shape, or a part is held. A separate configuration is required to control the deployment behavior of the airbag by protruding from between the arms.

  In this regard, in the configuration described in Patent Document 2, although the entire airbag can be wrapped, during folding work, the folded airbag is folded into a folded shape by a single cloth holding member. It is necessary to work carefully so as not to break down, so improving production efficiency is an issue.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wrapping member that can stably deploy an airbag while easily and reliably holding a folded airbag.

The wrapping member according to claim 1, which is a wrapping member that holds a folded state of the airbag that is inflated and deployed by the introduced gas, wherein the wrapping member is formed of a side surface portion and covers a side portion of the airbag. A joining portion that joins the ends of the side surface portion to form the side surface portion into a tubular shape, and is connected to all or a plurality of positions of an edge of the side surface portion on the inflation and deployment side of the airbag. Rise a cylindrical body portion and a top portion that covers at least a portion of the inflation and deployment side of the airbag is provided on at least the upper surface portion, said air bag being broken by the expansion pressure of the airbag And a break portion that forms an opening that protrudes.

Wrapping member according to claim 2, wherein, in the wrapping member according to claim 1, wherein the upper surface portion is one that is formed in a substantially circular shape.

According to a third aspect of the present invention, there is provided the wrapping member according to the first aspect, wherein the side surface includes a plurality of side surface components.

  The wrapping member according to claim 4 is the wrapping member according to claim 3, wherein the side surface portion includes a component main body, and an extending portion extending toward the upper surface at the positions of both ends of the component main body. The joining portion is formed in a state of being curved from both ends of the component main body to the extended portion at the position of the extended portion toward the center in both ends directions of the component main body. is there.

  A wrapping member according to a fifth aspect is the wrapping member according to any one of the first to fourth aspects, wherein the main body has a slit provided at an end opposite to the upper surface of the side surface. It is.

According to the wrapping member of the first aspect, the side surface portion that covers the side portion of the airbag is formed into a tubular shape by joining the end portions of the side surface portion with the joining portion, and the airbag of the side portion constituting portion is formed. against the edge or more locations inflated and deployed side, by forming in the tubular body portion connecting the upper surface portion which covers at least a portion of the inflation and deployment of the airbag, a breaking portion provided on the upper surface portion By simply inserting the folded airbag into the wrapping member, the airbag can be easily and reliably held in a state where the entire side of the airbag is covered by the cylindrical side surface, and the airbag is cylindrical when deployed. The peripheral portion is regulated by the side surface portion, so that it can be deployed stably.

According to the wrapping member according to claim 2, wherein, in addition to the effect of claim 1, wherein the wrapping member in a Turkey for forming the upper surface portion in a substantially circular shape, an air bag which is held in the upper surface portion in the folded state In addition, since the entire circumference is covered by the side portions and is regulated in a circular shape, it is possible to prevent the airbag from being caught at the time of assembly and to improve the uniformity of the shape after being folded.

According to the wrapping member according to claim 3, wherein, in addition to the effect of claim 1, wherein the wrapping member, the both end portions of the plurality of side portions constituting part of the side surface portion in Rukoto to adjust contact by joints, the air bag folded Since the entire side portion is covered by the side surface portion and the deployed side is pressed down by the upper surface portion, the airbag can be more reliably held with a simple configuration.

  According to the wrapping member according to the fourth aspect, in addition to the effect of the wrapping member according to the third aspect, the outer edge portion on the deployed side of the folded airbag is covered by the extended portion that has been folded down together with the joint portion. Can be held more reliably.

  According to the wrapping member according to the fifth aspect, in addition to the effect of the wrapping member according to any one of the first to fourth aspects, the slit is provided at an end opposite to the upper surface of the side surface to thereby provide the slit. The side part can be widely opened so that the folded airbag can be more easily inserted into the inside of the wrapping member.

FIG. 3 is a perspective view showing an operation of inserting the airbag into the wrapping member according to the first embodiment of the present invention. (A) is a perspective view showing an airbag wrapped by a wrapping member, and (b) is a side view of (a). It is a top view which shows the deployment state of a wrapping member same as the above. FIG. 2 is an exploded perspective view of the airbag device including the wrapping member and the airbag. It is a perspective view of an airbag apparatus same as the above. It is sectional drawing which shows an airbag apparatus same as the above. FIG. 2 is a front view schematically showing the deployed state of the airbag. It is a top view showing the deployment state of the wrapping member of a 2nd embodiment of the present invention. It is a perspective view showing an airbag wrapped with a wrapping member of a third embodiment of the present invention. It is a top view which shows the deployment state of a wrapping member same as the above. It is a perspective view showing an airbag wrapped with a wrapping member of a fourth embodiment of the present invention. FIG. 3 is a plan view showing a state before the wrapping member wraps the airbag.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  In FIG. 6, reference numeral 10 denotes an airbag. The airbag 10 constitutes an airbag device 11, and the airbag device 11 is mounted on a member to be mounted such as a steering wheel which is a steering wheel of an automobile as a vehicle. The occupant to be protected is protected from the impact of a collision. The steering wheel is usually attached to an inclined steering shaft and used in an inclined state.Hereinafter, the protected object side to which the airbag device 11 is attached is referred to as an occupant side, an upper side, or a front side. The side opposite to the occupant, ie, the side opposite to the occupant, will be described as the vehicle body side, the lower side, the bottom side, or the back side.

  The airbag device 11 is also called an airbag module, and includes a base plate (back plate) 21 constituting a support member, an airbag 10, an inflator 23, a retainer 24, and a cover body 25 attached to the base plate 21. The base plate 21 and the cover body 25 constitute a case body 26 that houses the airbag 10.

  The inflator 23 has a general shape and function of a substantially disk shape as a whole. As shown in FIG. 4, the inflator 23 includes a substantially columnar inflator body portion 23a and an outer peripheral portion of the inflator body portion 23a. A protruding plate-shaped mounting flange 23b is provided, and a plurality of gas injection ports 23c for injecting gas are radially formed on the inflator main body 23a toward the outer peripheral side, located above the mounting flange 23b. Are located in Also, bolt mounting holes 23d are formed in four places (only some are shown) in the mounting flange 23b. A connector at the tip of the harness is connected to the lower side of the inflator body 23a, and a control device (not shown) for controlling the operation of the inflator 23 is electrically connected through the harness.

  The base plate 21 is also called a back plate, a back holder, or the like. The base plate 21 is injection-molded integrally with, for example, a synthetic resin, and serves as a substantial bottom of the airbag device 11. The base plate 21 includes a board portion 27, which is a mounting surface portion as a case body, and a peripheral wall portion 28 raised to the front side over the entire peripheral portion on the front surface side of the board portion 27. .

  In the substrate portion 27, a circular hole-shaped inflator mounting hole 27a is opened at a substantially central portion, and four bolt mounting holes 27b (only some of which are shown) are respectively opened around the inflator mounting hole 27a. ing. These bolt mounting holes 27b communicate with bolt mounting holes 23d of the inflator 23. In addition, a locking portion 27c for locking the airbag device 11 (FIG. 6) to a member to be mounted is provided on the substrate portion 27 so as to project rearward.

  Outside the peripheral wall portion 28, a plurality of hook portions 28a and the like for engaging and holding the cover body 25 are provided.

  The airbag 10 shown in FIG. 1 includes one or more air chambers into which gas is introduced and inflates. In the present embodiment, the airbag body 30 has a circular shape and has one air chamber therein. It has. As shown in FIG. 6, the airbag body 30 is housed in the case body 26 in a state covered by a breakable wrapping member 31 as a shape holding member.

  The airbag body 30 is formed of one or more base fabrics (panels). The airbag body 30 has an inflator mounting hole (not shown) into which the inflator 23 is inserted, a mounting hole (not shown) located around the inflator mounting hole, and a vent hole (not shown).

  The retainer 24 is formed, for example, in a circular shape with metal or resin, and has a mounting bolt 24a inserted through a bolt mounting hole 27b (FIG. 4) of the base plate 21 and a bolt mounting hole 23d (FIG. 4) of the inflator 23. It is protruding.

  The cover body 25 shown in FIG. 6 is integrally formed of, for example, a synthetic resin, constitutes a front side of a part of the steering wheel, and is a front plate portion which is an opposing portion as a cover body that covers the airbag 10, the inflator 23, and the like. 41, and a mounting plate portion 42, which is a side edge portion as a mounting wall portion protruding downward in a cylindrical shape from the back side of the front plate portion 41.

  On the back surface of the front plate portion 41, a tear line (not shown), which is a groove-shaped portion to be broken having a small thickness, is formed at a position surrounded by the mounting plate portion 42. The bag 43 is configured to be torn along the tear line by the deployment pressure of the bag 10 to deploy the door portion 43.

  The mounting plate portion 42 is located outside the peripheral wall portion 28 of the base plate 21, and is formed along the outer shape of the peripheral wall portion 28. 4 and 5, the mounting plate 42 has a plurality of insertion openings 42a into which the hooks 28a of the base plate 21 are inserted and engaged.

  The wrapping member 31 shown in FIG. 2 (a) and the like is combined, for example, by synthetic resin, paper, cloth, non-woven fabric, or a method of adding, impregnating, blending, or coating a resin after or during the production thereof. Or a resin sheet of polyester or the like. In the present embodiment, the wrapping member 31 is formed of one or a plurality of base cloths. The wrapping member 31 includes a main body 51 formed in a cylindrical shape, for example, a cylindrical shape, and a break portion 52 provided in the main body 51.

  The main body 51 includes an upper surface 55 which is a circular top plate, a cylindrical side surface 56, a tab 57 (FIG. 1) provided as a fixing portion provided on the side surface 56, and a side surface 56. And a slit 58 provided at the end. In the present embodiment, as shown in FIG. 3, the upper surface 55, the side surface 56, and the tab 57 are formed of different base cloths different from each other, and the upper surface 55 and the side surface 56 are sewn or the like. By being joined, the main body 51 has a closed cylindrical shape. That is, an airbag housing 59 (FIG. 6), which is a space surrounded by the upper surface 55 and the side surface 56, is defined inside the main body 51 (wrapping member 31).

  As shown in FIG. 6, the upper surface portion 55 is at least a part of a portion of the airbag 10 that faces the inflated and deployed side of the airbag 10 in a folded state, that is, a portion of the airbag 10 that faces the back side of the front plate portion 41 of the cover body 25. In the present embodiment, almost the entirety is covered. In other words, the upper surface portion 55 is a portion interposed between the airbag 10 and the front plate portion 41 of the cover body 25. As shown in FIG. 3, the upper surface 55 is formed in a circular shape or an elliptical shape by, for example, a single base cloth 61.

  The side surface portion 56 is also called a side panel or the like, and covers the side portion of the folded airbag 10 as shown in FIG. In other words, the side surface portion 56 is a portion interposed between the airbag 10 and the peripheral wall portion 28 of the base plate 21 and / or the mounting plate portion 42 of the cover body 25. The side surface portion 56 is formed in a cylindrical shape having a smaller diameter than the upper surface portion 55. In the present embodiment, as shown in FIG. 3, the side surface portion 56 is formed in a band shape by, for example, one base cloth 63, and both end portions 63a, 63a in the longitudinal direction of the base cloth 63 (both short sides). In a state in which the surplus pieces 64 located at the same position are overlapped with each other, these both ends 63a, 63a are joined (sewed) to each other by, for example, a sewing portion 65 (FIG. 2A) as a joining portion to form a cylindrical shape. Have been. As shown in FIG. 2B, the side surface portion 56 has an end portion in the short direction, that is, an upper end portion 56a (one long side portion of the base cloth 63) facing the back side of the upper surface portion 55. The upper surface 55 is joined to the upper surface 55 by sewing, for example, to form a circular boundary portion 66 shown in FIG. That is, in the present embodiment, the boundary 66 is formed by sewing thread. This boundary portion 66 is a portion that becomes a hinge portion when the wrapping door portion 71 (FIG. 6) described later is deployed. Further, the side surface portion 56 has a smaller diameter than the upper surface portion 55 and is coaxially connected to the upper surface portion 55. For this reason, the outer edge of the upper surface 55 is an extension 55a that extends outward beyond the side 56.

  The tab 57 shown in FIG. 3 has an end on the side surface 56 opposite to the upper surface 55, that is, a lower end 56b shown in FIG. 2A (the other long side of the base cloth 63 shown in FIG. 3). When the airbag 10 (FIG. 1) is wrapped, it is bent inward from the base end toward the side surface 56 so as to face the lower portion of the airbag 10 (FIG. 1). Has become. The tabs 57 are provided in a plurality, for example, four corresponding to the number of the mounting bolts 24a (FIG. 6). Each tab 57 has a round hole-shaped bolt through which the mounting bolt 24a (FIG. 6) is inserted. The mounting hole 73 is opened. Further, in the present embodiment, as the tabs 57, one tab 57a and another tab 57b having different shapes are set. For example, one tab 57a is formed in a quadrangular shape, and the other tab 57b has a shape in which the tip is curved with respect to the one tab 57a. That is, the one tab 57a and the other tab 57b can be visually distinguished from each other. Therefore, when attaching the folded airbag 10 wrapped by the wrapping member 31 to the base plate 21 (the case body 26 (FIG. 6)) as shown in FIG. 4, the shape of the tab 57 shown in FIG. This allows the operator to recognize the correct mounting direction of the airbag 10 (FIG. 6). In the present embodiment, two tabs 57a and two tabs 57b are provided. However, the present invention is not limited to this as long as the mounting direction of the airbag 10 (FIG. 4) with respect to the base plate 21 (FIG. 4) can be identified. Instead, the shape can be set arbitrarily.

  As shown in FIG. 1, the slit 58 accommodates the folded airbag 10 in the airbag accommodation portion 59 in the wrapping member 31 such that the lower end portion 56b of the side surface portion 56 can be greatly widened at the position of the tab 57. 2 (a), a straight line extends along the vertical direction from the lower end 56b of the side surface 56, that is, along the direction intersecting (substantially perpendicular to) the lower end 56b of the side surface 56. Notches are formed. In the present embodiment, the slit 58 is disposed at an intermediate position between the tabs 57, 57 as shown in FIG.

  On the other hand, the break 52 shown in FIG. 2A is located on the upper surface 55 of the main body 51 in the present embodiment. The break portion 52 includes, for example, a plurality of cut portions 52a that are openings, and scheduled break portions 52b that are non-open portions located between the cut portions 52a. The broken portion 52 forms an opening 74 (FIG. 6) in the upper surface portion 55 by breaking.

  In the present embodiment, for example, the notch 52a is formed radially (straightly) from the center of the upper surface 55 in the radial direction and arranged in a cross shape (X-shape). Therefore, the portion surrounded by the cut portions 52a, 52a circumferentially adjacent to the upper surface portion 55 and the boundary portion 66 forms the wrapping door portion 71 (FIG. 6) when the airbag 10 (FIG. 6) is inflated and deployed. For example, a fan-shaped wrapping door scheduled portion 75 is formed. The notch 52a may have one end, which is the outer end, continuous over the side surface 56, for example, beyond the boundary 66.

  In the present embodiment, the breakable portion 52b is located, for example, at the center of the upper surface 55 and between the other ends, which are the inner ends of the cuts 52a. The scheduled rupture portion 52b connects the scheduled lapping door portion 75, and is ruptured (split) by the deployment pressure of the airbag 10 (FIG. 6) to separate the respective scheduled lapping door portions 75 from each other. This is a fragile part that is a part 71 (FIG. 6).

  Then, when assembling the airbag device 11 shown in FIG. 6, as a general rule, first, a retainer 24 is installed in the airbag 10, and the airbag 10 is folded into a predetermined shape and wrapped by a wrapping member 31. The airbag device 11 is configured by combining the base plate 21 and the inflator 23.

  More specifically, the retainer 24 is inserted into the airbag 10 from the inflator mounting hole, and the mounting bolt 24a is inserted into the bolt mounting hole from above.

  Next, the airbag 10 is folded into a predetermined shape according to the deployment characteristics and the like.

  Further, as shown in FIG. 1, by storing the airbag 10 in the airbag storage portion 59 of the wrapping member 31, the folded shape is maintained, and the deployed side of the airbag 10 is opposed to the upper surface portion 55. At this time, the wrapping member 31 can be easily inserted into the airbag storage portion 59 by inserting the airbag 10 while widening the lower end portion 56b of the side surface portion 56 by the slit 58. At the time of this insertion, for example, the up and down of the airbag 10 in a state where the airbag device 11 is attached to the steering wheel is checked.

  Thereafter, each tab 57 is bent inward, and the mounting bolt 24a is inserted into the bolt mounting hole 73.

  The airbag 10 wrapped by the wrapping member 31 is attached to the base plate 21 as shown in FIG. At this time, the mounting bolt 24a is inserted into the bolt mounting hole 27b of the base plate 21. At the time of this attachment, the up and down of the airbag 10 with respect to the base plate 21 is confirmed by the shape of the tab 57 (FIG. 3).

  Further, the mounting flange portion 23b of the inflator 23 is arranged along the back side of the base plate 21, the mounting bolt 24a of the inflator 23 is inserted into the bolt mounting hole 23d of the mounting flange portion 23b, and a nut (not shown) is inserted from the tip of the mounting bolt 24a. Screw and tighten. In this state, the inflator body 23a of the inflator 23 is inserted inside from the inflator mounting hole of the airbag 10, that is, the gas injection port 23c is arranged in the airbag 10.

  Then, the airbag device 11 (FIG. 5) is assembled by fitting the cover body 25 over the base plate 21 from above. In this state, as shown in FIG. 6, the wrapping member 31 that houses the airbag 10 is, together with the airbag 10, a step between the distal end portion of the peripheral wall portion 28 of the base plate 21 and the mounting plate portion 42 of the cover body 25. It is arranged so that a part may fit in space S of shape.

  The assembled airbag device 11 is mounted on a steering wheel by a locking portion 27c (FIG. 4) provided on the base plate 21.

  When a collision impact is applied to the automobile equipped with the airbag device 11, the inflator 23 is activated by a control device (not shown), and gas is rapidly injected from the gas injection port 23c of the inflator 23 into the airbag body 30 of the airbag 10. Is injected. Then, the deployment pressure of the airbag 10 acts on the upper surface portion 55 of the wrapping member 31 and the front plate portion 41 of the cover body 25, respectively, and the rupture scheduled portion 52b of the upper surface portion 55, and the tear line of the front plate portion 41 are broken. The opening 74 and the projecting opening 77 are formed by expanding the lapping door 71 and the door 43. At this time, since the airbag 10 is partially fitted into the space S, the deployment pressure of the airbag 10 effectively acts on the entire surface of the front plate portion 41 of the cover body 25, and the tear line is reliably broken. The airbag 10 is expanded and expanded so as to expand from a circular state by being regulated by the side surface portion 56 of the wrapping member 31 through the projecting opening 77 (solid line in FIG. 7), The airbag 10 (the airbag body 30) that has been inflated and deployed in front of the occupant and received and restrains the occupant thrown forward and reduces the impact applied to the occupant.

  As described above, according to the present embodiment, the wrapping member 31 has the side surface portion 56 that covers the side portion of the airbag 10, and at least a part of the side surface portion 56 is connected to the inflating and deploying side of the airbag 10. With the main body 51 formed into a cylindrical shape having an upper surface portion 55 covering a part thereof, and the break portion 52 provided on the upper surface portion 55, the folded airbag 10 is simply inserted into the wrapping member 31. And can be easily and reliably held.

  Further, by providing a slit 58 at the end opposite to the upper surface 55 of the side surface 56, the side surface 56 is greatly opened from the slit 58, and the folded airbag 10 is inserted into the wrapping member 31. Can be inserted more easily.

  Further, the upper surface portion 55 of the wrapping member 31 is formed in a substantially circular shape, and a part of the side surface portion 56 is joined to the upper surface portion 55 to form the side surface portion 56 in a substantially cylindrical shape, thereby holding the wrapping member 31. The folded airbag 10 is entirely covered with the upper surface 55 and the side surface 56 in the folded state and is regulated in a circular shape, so that the airbag 10 at the time of assembly can be prevented from being caught and, for example, The corners of the folded airbag 10 like a conventional wrapping member assembled in a shape do not protrude from the gap of the wrapping member to form an irregular corner, and the uniformity of the shape after being folded can be improved. .

  Further, since the side surface portion 56 is connected to the upper surface portion 55 by the boundary portion 66 formed by sewing, the position near the boundary portion 66 that becomes a hinge when the wrapping door portion 71 is deployed can be firmly configured.

  Moreover, since the wrapping member 31 has a band-shaped side portion 56, a force is applied substantially evenly to the internal airbag 10 in the circumferential direction, the wrapping member 31 can hold the fold in a circular shape, and can be held in the minimum shape. , And can cope with the circular base plate 21.

  Further, since the airbag 10 is only inserted inside the wrapping member 31, a load is applied to the break portion 52 when the airbag 10 is wrapped, as in the conventional structure in which the wrapping member is pulled to tighten the airbag. In addition, since the load on the rupture portion 52 can be eliminated, the strength of the rupture portion 52 (scheduled rupture portion 52b) can be further reduced (it can be set to be more easily ruptured). As a result, the deployment of the airbag 10 is less likely to be hindered by the wrapping member 31.

  When the airbag 10 is deployed, its periphery is regulated by the side surface portion 56, so that the airbag 10 is compared with a conventional example (an imaginary line in FIG. 7) in which the airbag 10 is fastened and held by a wrapping member. Since the developing behavior of 10 expands from a circular state (solid line in FIG. 7), it can be developed stably.

  Further, when the airbag 10 is deployed, the side surface portion 56 serves as a reinforcing member in the circumferential direction, so that the load on the mounting plate portion 42 of the cover body 25 due to the inflation pressure of the airbag 10 can be reduced. Can be reduced in thickness. As a result, the size and weight of the airbag device 11 can be reduced.

  Furthermore, since the side surface portion 56 has strength in the circumferential direction with respect to the deployment of the airbag 10, the airbag 10 is deployed toward the front plate portion 41 of the cover body 25 when the airbag 10 is deployed. It will be easier. Therefore, the timing for tearing the door portion 43 of the cover body 25 from the tear line without being hindered by the wrapping member 31 can be advanced.

  After the wrapping door 71 is torn, the wrapping member 31 is crushed by the load applied in the direction of buckling due to the deployment pressure of the airbag 10, so that the deployment of the airbag 10 is hardly hindered.

  In the above-described first embodiment, the slit 58 is not an essential component, and the tabs 57 may all have the same shape as in the second embodiment shown in FIG.

  Next, a third embodiment will be described with reference to FIGS. In addition, about the structure and effect | action similar to each said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the third embodiment, the wrapping member 31 is constituted by, for example, one base cloth 81. That is, the base fabric 81 is configured such that the upper surface portion 55 and the side surface portion 56 are integrally formed.

  Here, as shown in FIG. 10, the base fabric 81 is provided with an upper surface portion constituting portion 83 constituting the upper surface portion 55 and a side portion constituting portion 84 constituting the side surface portion 56. The base fabric 81 has a substantially line-symmetric shape in the vertical and horizontal directions.

  The upper surface portion 83 is formed, for example, in the left-right direction, that is, in a substantially elliptical shape that is horizontally long. A break portion 52 is provided at the center of the upper surface portion 83.

  The side surface component 84 is formed, for example, in a rectangular shape longer in the left-right direction than the upper surface component 83, and is integrally connected to the upper and lower surfaces of the upper surface component 83 via continuous portions 85, respectively. The upper and lower side surface components 84 are separated from each other with the upper surface component 83 interposed therebetween. Further, each of the side surface portion forming portions 84 is provided with a plurality of tabs 57 and a plurality of slits 58 at an end opposite to the upper surface portion forming portion 83. Further, both end portions in the longitudinal direction of each side surface component 84 extend laterally from the upper surface component 83. The edge portions of the side surface component portions 84 extending from the upper surface component portion 83 are overlapped with each other by, for example, a sewn portion 87 (FIG. 9) as a joining portion in a state where they are overlapped with each other. It is 88.

  Further, both ends of the continuous portion 85 are slit-shaped cut portions 85a formed by cutting.

  When the wrapping member 31 is formed, each side portion constituting portion 84 is bent and pulled from each continuous portion 85 of the base cloth 81, and the excess pieces 88 of each side portion constituting portion 84 are overlapped with each other and sewn. Thus, the side surface portion 84 constitutes a tubular (substantially cylindrical) side portion 56 and the upper surface portion 83 constitutes the upper surface portion 55. At this time, the left and right side portions of the upper surface portion 83 (the upper surface portion 55) become the extending portions 55a projecting left and right with respect to the side surface portion 56 by the cut portions 85a, 85a at both ends of the continuous portion 85.

  When storing the folded airbag 10 in the completed wrapping member 31, the vertical direction can be determined using the position of the continuous portion 85 as a vertical mark.

  As described above, the wrapping member 31 has the same configuration as that of each of the above-described embodiments, so that the same operation and effect as those of the above-described embodiments can be achieved.

  In addition, by forming the cylindrical side portion 56 by three-dimensionally sewing the side portion forming portion 84, a force is applied substantially evenly in the circumferential direction to the internal airbag 10, and the folding is maintained in a circular shape. It can be held in the minimum shape.

  Further, by forming the wrapping member 31 with one base cloth 81, the side part constituting part 84 can be pulled more strongly from the position of the continuous part 85, and the vertical direction of the folded airbag 10 can be reliably suppressed. Thus, the airbag 10 can be held in a smaller shape.

  In the third embodiment, the upper surface portion 55 has a shape that does not hinder the operation from the wrapping of the folded airbag 10 to the assembly of the airbag device 11 as long as the deployment performance of the airbag 10 is not impaired. Can be selected. For example, the upper surface portion 83, which is the upper surface 55 in the drawing of FIG. 10, may be reduced from the left and right sides toward the center to form a band that is bridged at a substantially central position between the side surface portions 84. it can. In this case, the break portion 52 may be formed not only in a slit shape but also in a notch portion formed by cutting out an appropriate portion of the band-shaped upper surface portion 83 toward the center in the width direction, for example. Also, a plurality of band-shaped upper surface component portions 83 (upper surface portions 55) can be set by adjusting the width. Alternatively, the width of the upper and lower continuous portions 85 of the upper surface portion forming portion 83 and the side surface portion forming portion 84 is kept in FIG. 10, and the upper surface portion forming portion 83 has a triangular shape such that the area gradually decreases toward the center side. Vertices may be connected to each other. In this case, the connection portion at the center portion becomes the break portion 52.

  Further, the side surface component portion 84 is configured to be continuous with the upper and lower positions of the upper surface portion component 83. However, for example, depending on the application of the airbag 10 (airbag device 11), the side surface portion The configuration unit 84 may be configured to be continuous.

  Further, the position of the tab 57 can be arbitrarily changed.

  Further, in each of the above embodiments, the break portion 52 may include, for example, a plurality of hole-shaped openings instead of the slit-shaped cut portion 52a. At this time, the shape of these openings is such that the non-opening (fragile portion), which is a cross-shaped (X-shaped) portion excluding these openings, is surely broken by the deployment pressure of the airbag 10, for example, a fan shape And so on.

  Next, a fourth embodiment will be described with reference to FIGS. In addition, about the structure and effect | action similar to each said Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the fourth embodiment, as shown in FIG. 11, a plurality of side portions 56 surrounding the periphery of an airbag housing portion 59, for example, both ends of base cloths 91, 91 as a pair of base materials are joined. In addition to being formed in a cylindrical shape, the upper surface portion 55 is provided in a belt shape integrally with one base cloth 91, and is joined to the other base material 91.

  Each base cloth 91 is provided with a band-shaped side part constituting part 93. Further, a central extension portion 94 which is an upper surface portion constituting the upper surface portion 55 is provided integrally with one base cloth 91, and the central extension portion 94 is joined to the other base cloth 91. The joint receiving portion 95 is provided integrally. The base cloths 91 and 91 are joined by a sewing portion 96 as a joining portion, and the distal end portion of the central extension portion 94 is joined to a joining receiving portion 95 by a central sewing portion 97 as a central joining portion. ing.

  The side surface portion 93 integrally includes a component main body 98, which may also be referred to as a general portion, and extended portions 99, 99 provided at both ends of the component main body 98. Further, both end portions of the side surface portion forming portion 93 are formed to be curved in an arc shape protruding outward.

  The component body 98 is elongated in the circumferential direction of the body 51. Further, tabs 57 (one tab 57a and another tab 57b) are respectively protruded from the lower part of the component main body 98 serving as the lower end 56b of the main body 51, and an intermediate portion between these tabs 57, 57 is provided. A slit 58 is provided at the position.

  The extending portions 99 project upward from upper portions of both end portions of the component main body 98 (portions serving as upper end portions 56a of the side surface portions 56). The amount of extension of the extending portion 99 with respect to the component main body 98 is set according to the size and shape of the airbag 10. In addition, these extending portions 99 are inclined so that the amount of upward projection gradually increases as the distance from the center of the component main body 98 increases.

  The central extending portion 94 is provided so as to protrude upward from an upper portion (a portion serving as the upper end portion 56a of the side surface portion 56) of the component main body 98 (side surface portion 93). The central extending portion 94 is formed in a belt shape having a longitudinal direction in a direction intersecting (perpendicular to) the component main body 98 (the side surface component 93). Therefore, the upper surface portion 55 is provided across the upper end portion 56a, which is the edge of the side surface portion 56 on the inflation and deployment side of the airbag 10, along the diametrical direction. In other words, the upper surface portion 55 is located at a plurality of positions of an upper end portion 56a, which is an edge of the side surface portion 56 on the side of the inflation and deployment of the airbag 10, and in the present embodiment, with respect to the central axis of the cylindrical side surface portion 56. Are provided so as to connect two locations facing each other. In the vicinity of the central portion in the longitudinal direction of the central extension portion 94, a central portion in the longitudinal direction which is the central portion (near the central axis) of the wrapping member 31 in a state in which the folded airbag 10 is wrapped. Notches 101, 101 are formed so as to gradually become narrower from both sides in the width direction. The center extending portion 94 (upper surface portion 55) has the upper surface portion 55 (central extending portion 94) at the center in the longitudinal direction, that is, at the position where the width is narrowest due to the notches 101, 101. A slit that becomes the breaking portion 52 is formed across the direction.

  The joint receiving portion 95 is provided in a rectangular shape so as to protrude upward from an upper portion (a portion to be the upper end portion 56a of the side surface portion 56) of the component main body 98 (side surface portion 93).

  The sewn portion 96 joins the side surface portion forming portions 93 by sewing. The sewn portion 96 is formed from both end portions of the component main body 98 to the extended portions 99, 99. The sewn portion 96 is continuous from the lower end of the component main body 98 to the upper ends of the extending portions 99 and 99. That is, the sewn portion 96 is continuous from the lower end portion 56b of the side surface portion 56 to the upper end portion 56a. The sewn portion 96 is curved along both end portions of the side portion constituting portion 93. That is, the sewn portion 96 is curved in an arc shape protruding outward. In other words, the sewn portion 96 is curved such that the upper and lower central portions 96c project outward (toward the airbag 10) with respect to the upper end portion 96a and the lower end portion 96b. Further, the upper end portion 96a of the sewn portion 96 protrudes above the upper portion of the component main body 98, and has a so-called inverse shape that is curved so as to be folded toward the center in both end directions of the side portion component 93. Has become.

  The central sewing portion 97 is formed in a straight line so as to cross the central extension portion 94 and the joint receiving portion 95 in the width direction.

  Then, by storing the airbag 10 folded in accordance with the deployment characteristics and the like in the airbag storage portion 59 of the wrapping member 31, the folded shape is maintained, and the deployment side of the airbag 10 is opposed to the upper surface portion 55. At this time, the upper end portion 96a of the sewing portion 96 is curved toward the airbag 10 at the position of the extending portion 99, 99 located at the upper end portion 56a, so that the extending portion 99, 99 The airbag 10 falls down so as to cover the outer edge on the deployed side (FIG. 11).

  In this manner, the wrapping member 31 has a cylindrical shape by joining the side portions 56 at both ends of the plurality of side portion forming portions 93 with the sewing portions 96, and the upper surface portion 55 of the side portion 56 on the side of the inflation and deployment of the airbag 10. By connecting a plurality of positions of the upper end portion 56a, which is the edge of the airbag 10, the folded airbag 10 is entirely covered with the side surface portion 56 in a circular shape, and the deployed side is pressed down by the upper surface portion 55. Therefore, the same operational effects as those of the above-described embodiments can be achieved, such as the airbag 10 can be more securely held with a simple configuration.

  Moreover, extending portions 99, 99 extending toward the upper surface portion 55 are formed at the positions of both ends of the component main body 98, and the sewn portion 96 is extended from both ends of the component main body 98. Over the entire length of the airbag 10 at the position of the extending portions 99, 99, by bending toward the center in the direction of both ends of the component body 98, and by the extending portions 99, 99 that have fallen down together with the sewing portion 96, the deployment side of the folded airbag 10. , The airbag 10 can be held more reliably.

  In the above-described fourth embodiment, the side surface portion 56 is formed by the pair of base fabrics 91, 91. It may be formed in a shape.

  Similarly, the side surface component 93 is set on each of the base fabrics 91. However, for example, by forming the pair of side surface component 93 and 93 so as to be connected to each other at the upper surface 55, the side surface 56 is formed as one. It is also possible to configure with a single base cloth.

  Further, the upper surface portion 55 is formed in a straight line along the diameter direction of the cylindrical side surface portion 56, but may be formed in a radial shape, for example, or may be formed in a circular shape.

  Further, the break portion 52 can be formed by sewing, for example, other than the slit.

  Further, the extending portions 99, 99 are not an essential component, and the upper edge of the side portion constituting portion 93, which is the upper end portion 56a of the side portion 56, may be formed in a substantially linear shape. With this configuration, the yield at the time of cutting the side surface component 93 (the side surface 56) from the base cloth is improved. Further, at this time, the central extension portion 94 and the joint receiving portion 95, that is, the upper surface portion 55 are not formed, for example, with the side surface portion forming portion 93 (the side surface portion 56) but by a separate base cloth. Thus, the yield at the time of cutting the upper surface portion 55 and the side surface portion 56 can be further improved.

  In each of the above embodiments, the airbag device 11 provided in the steering wheel has been described, but the airbag device provided in the instrument panel portion of the passenger seat or the rear seat provided in the rear seat is provided. The present invention is also applicable to other airbag devices in which the airbag 10 is deployed in front of the occupant, such as an airbag device.

  INDUSTRIAL APPLICATION This invention can be used suitably as a wrapping member which hold | maintains the airbag used for a steering wheel in the folded state, for example.

10 Airbag
31 Wrapping material
51 Main unit
52 Break
55 Top
56 Side
58 slit
74 opening
93 Side component
96 Sewing part as joint
98 Component body
99 Extension

Claims (5)

A wrapping member that holds a folded state of the airbag that is inflated and deployed by the introduced gas,
A side surface portion formed from a side surface portion and covering a side portion of the airbag; a joining portion for joining an end portion of the side surface portion to form the side surface portion into a tubular shape; and the side surface portion and said airbag inflation and deployment side edges of all or a plurality of locations and coupled inflated and deployed side of the cylindrical body portion and a top portion that covers at least a portion of said air bag,
A rupture member provided at least on the upper surface portion, the rupture portion being formed by an inflation pressure of the airbag to form an opening for inflating the airbag. Top portion, the wrapping member according to claim 1, characterized in that it is formed in a substantially circular shape. The wrapping member according to claim 1, wherein the side surface portion includes a plurality of side surface component portions . The side component is
The component body,
An extended portion extending toward the upper surface at the positions of both ends of the component body,
The joining portion is formed so as to be curved from both ends of the component main body to the extended portion at a position of the extended portion toward a center in both ends directions of the component main body. The wrapping member according to claim 3. The wrapping member according to any one of claims 1 to 4, wherein the main body has a slit provided at an end opposite to the upper surface of the side surface.

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