JP6433816B2 - Cover body of airbag device - Google Patents

Description

  The present invention relates to a cover body of an airbag device that covers a facing portion of a cover body facing a stored airbag with a plurality of skin bodies.

  2. Description of the Related Art Conventionally, for example, an airbag device is known that is disposed on a portion to be installed such as an instrument panel portion or a steering wheel of an automobile. The airbag device includes a box-shaped case body, and a folded airbag and an inflator for injecting a gas for inflating the airbag are housed inside the case body. The upper opening is covered with a cover body. In the cover body, a tear line such as a substantially H-shaped flat surface or a substantially C-shaped flat surface is formed in a lid portion that is a facing portion facing the airbag, and is surrounded by the tear line. The section is formed as a planned door portion. In the event of a car collision, etc., the airbag into which inflation gas is blown from the inflator pushes up the planned door portion covering the inflation side of the airbag, breaks the tear line by the inflation pressure, The door flap, that is, the door portion is configured to open.

  In such an airbag device, in recent years, a configuration in which the surface of the lid portion is covered with a skin body such as leather for the purpose of improving aesthetics is known. In the case of this configuration, one and other epidermis bodies that respectively cover one side and the other side across the tear line so that the tearing of the door part from the tear line is not hindered by the epidermis body, position of the edge facing the tear line And sew together to join. That is, these one and other epidermis bodies are arranged in a state where their boundary positions are along the tear line (see, for example, Patent Document 1).

JP 2009-248907 A (page 4-7, FIG. 1-7)

  In the case of the above-described configuration, when the cover body is attached to the installation portion, the end portion of the entrainment portion of each epidermis is sandwiched between the edge portion of the lid portion and the installation portion. When the part expands, the door part is pulled by each epidermis at the position of the sandwiched end part, and the push-up of each epidermis by the door part is restricted. Accordingly, in order to prevent each skin body from hindering smooth development of the door at the position of the sandwiched end portion, for example, a process such as applying a tear line to each skin body is required.

  The present invention has been made in view of such a point, and provides a cover body of an airbag device that can obtain desired deployment characteristics of an airbag without subjecting one and other skin bodies to separate processing. For the purpose.

  The cover body of the airbag device according to claim 1 is provided in an opposing portion that is fitted to the installation portion and covers the stored airbag, and is provided in the opposing portion, and defines the opposing portion, and the airbag is inflated. A tear line that is split at the time of deployment to form a plurality of doors, and a cutout is formed at the edge of the facing part that faces the installation part at a position on the extension of at least one end of the tear line. A cover body having a notch, one skin covering one side of the tear line of the facing portion of the cover body, and another skin covering the other side of the tear line of the facing portion of the cover body. The one and other epidermis bodies have one and other joint portions joined to each other at an edge facing the tear line, and at least one of these one and other joint portions is bent to the back side. Each end There are those housed folded back the cut portion.

  The cover body of the airbag device according to claim 2 is the cover body of the airbag device according to claim 1, wherein the tear line has a straight portion formed in a straight line, and the notch portion is a straight portion of the tear line. Are notched at the edge portions of the facing portion facing the portion to be installed at the positions of both end portions.

  According to the cover body of the airbag device according to claim 1, the notch portion is notched and formed at the edge facing the installation portion at a position on the extension of at least one end of the tear line of the facing portion. Fold at least one of the one and other joints located on the edge facing the tear line of one and other epidermis covering one side and the other side of the tear line of the facing part of the cover body to the back side, By folding the end portions into the cutout portions and storing them, it is possible to weaken the pinching between the facing portions of these end portions and the installed portion. Therefore, the door part that is deployed when the airbag is inflated is easily pulled out at the end of the one and other joints, and it is difficult to impede the deployment operation of the door part. The desired deployment characteristics of the airbag can be obtained without any problems.

  According to the cover body of the airbag device according to claim 2, in addition to the effect of the cover body of the airbag device according to claim 1, the notch portion is opposed to the installation portion at both end portions of the straight line portion of the tear line. By forming notches at the edges of the opposing portions, the both ends of one and other joints are respectively housed in these notches, thereby allowing the one and other joints to be opened by the door portion that is deployed when the airbag is inflated. Both end portions of the airbag are easily pulled out, and the deployment operation of the door portion is less likely to be hindered, and the desired deployment characteristics of the airbag can be more easily obtained without separately processing one and other skin bodies.

1 shows a first embodiment of a cover body of an airbag device of the present invention, (a) is a cross-sectional view of a position corresponding to II in FIG. 5, (b) is a cross section of a position corresponding to II-II in (a). FIG. It is a perspective view which shows one and the other junction part vicinity of a cover body same as the above from the back side. It is a perspective view which shows the unfolded state of the door part of a cover body same as the above. It is a disassembled perspective view of a cover body same as the above. It is a perspective view which shows the installation state to the to-be-installed part of a cover body same as the above. It is sectional drawing which shows a part of airbag apparatus provided with the cover body same as the above. The 2nd Embodiment of the cover body of the airbag apparatus of this invention is shown, (a) is a perspective view of a cover body, (b) is a front view which shows the installation state to the to-be-installed part of a cover body. The 3rd Embodiment of the cover body of the airbag apparatus of this invention is shown, (a) is a perspective view of a cover body, (b) is a front view which shows the installation state to the to-be-installed part of a cover body. It is a cross-sectional view which shows a part of 4th Embodiment of the cover body of the airbag apparatus of this invention. It is a cross-sectional view which shows a part of 5th Embodiment of the cover body of the airbag apparatus of this invention. It is a cross-sectional view of a part of a cover body showing a sixth embodiment of a cover body of an airbag device of the present invention. It is a cross-sectional view of a part of a cover body showing a seventh embodiment of a cover body of an airbag device of the present invention.

  Hereinafter, a first embodiment of a cover body of an airbag device of the present invention will be described with reference to the drawings.

  In FIG. 6, reference numeral 10 denotes an airbag device. The airbag device 10 is an airbag for a passenger on a passenger seat provided in an opening portion 13 as an installation portion opened at an upper portion of an instrument panel portion 12 of an automobile, for example. The apparatus 10 is configured. The instrument panel portion 12 is provided in the front portion of the passenger compartment over substantially the entire length in the vehicle width direction, and a front window glass (not shown) is positioned above the instrument panel portion 12. An airbag device 10 is installed inside the instrument panel 12 so as to face the passenger in the passenger seat. The airbag device 10 includes a case body 15 that is a member to be attached and is also called a retainer, an inflator (not shown) disposed at a lower portion of the case body 15, and an airbag that is folded and stored at the upper portion of the case body 15. 17 and a cover body 18 that covers the airbag 17, that is, the case body opening 15 a at the top of the case body 15. Further, a hook 15 b having a substantially C-shaped cross section is attached to the outer surface of the upper portion of the case body 15 as a mounted portion that is locked to the cover body 18. As the inflator, various inflators such as a combustion type (pyro type), a stored type that compresses and stores gas, and a hybrid type that combines these are used. In the airbag device 10, the case body 15 is attached to the vehicle body side member via a bracket (not shown).

  When an automobile equipped with the airbag device 10 collides, the airbag 17 is inflated by the gas supplied from the inflator, the cover body 18 is broken by the inflation pressure, and the airbag 17 is inflated. The airbag 17 protrudes upward as a predetermined direction, and the airbag 17 is inflated and deployed forward of the occupant. Hereinafter, a predetermined direction on the bulging side of the airbag 17, that is, the occupant side, is defined as the upper side (the direction of arrow A shown in FIG. 6), the front side or the front side, and the opposite side of the bulging side is the lower side ( The direction of the arrow B shown in FIG. Further, the front-rear direction and the both-side direction in the state where the airbag device 10 is attached to the automobile will be described as the front-rear direction and the both-side direction. However, the attachment state of the airbag device 10 is not limited to this configuration. It can also be attached with the side facing upward or rearward on the rear side.

  The cover body 18 shown in FIGS. 1 to 6 is also called an air grid or a lid, and the cover body 21 and one and other skin bodies 22 and 23 attached to the cover body 21 are integrated. Thus, an interior member called a so-called seamless lid or seamless instrument panel, which is integrated with an instrument panel portion 12 that is an interior panel for an automobile, is formed.

  The cover body 21 is composed of a single member or a plurality of members made of synthetic resin, etc., and a facing portion 25 constituting a part of the instrument panel portion 12 and a case integrally provided with the facing portion 25 And an attachment piece portion 26 as an attachment portion to which the hook 15b of the body 15 is attached.

  The facing portion 25 is also called a lid portion, and covers the stored airbag 17, and is exposed to the outside from the opening 13 of the instrument panel portion 12, and is elongated in the vehicle width direction at the front portion of the vehicle compartment. Yes, the whole is formed in a substantially plate shape. In the present embodiment, the outer edge portion facing the inner edge portion 13a of the opening portion 13 of the facing portion 25 is a long side portion 28, 28 that is a pair of first side portions that are linear along the vehicle width direction, and A pair of short sides 29, 29, which are second sides that are straight along the front-rear direction and shorter than the long sides 28, 28, are provided, and the short sides 29, 29 have notches 30, Thirty notches are formed in each. Further, the opposing portion 25 is formed with a tear line 31 as a fragile portion on the back side, that is, the back side, substantially facing the case body opening 15a at the top of the case body 15, and the tear line 31 forms an outer edge. The portion where the section is divided is a pair of front and rear door planned portions 32 and 32, and the outside of the tear line 31, that is, the portion surrounding the door planned portions 32 and 32 is an outer portion 33 which is a non-deployment portion. ing.

  The long side portions 28 and 28 and the short side portions 29 and 29 are opposed to the inner edge portion 13a of the opening portion 13 at a distance substantially equal to the thicknesses of the one and other epidermis bodies 22 and 23, respectively.

  The notches 30 and 30 house the edges of one and other epidermis bodies 22 and 23, which will be described later, and are notched in the center of the short sides 29 and 29, and are formed in the inner edge 13a of the opening 13. Opposite positions. In the present embodiment, the cutout portions 30 and 30 are formed in a quadrangular shape (trapezoidal shape) that expands outward from the facing portion 25, in other words, toward the inner edge portion 13a of the opening portion 13. Has been. Further, the notches 30 and 30 are recessed inwardly with respect to the short side portions 29 and 29 which are the outer edge portions of the facing portion 25 by at least the thickness of one and other epidermis bodies 22 and 23.

  Further, the tear line 31 (FIG. 4) is a thin portion that can be called a tear, a tear groove, a planned fracture portion, a planned fracture groove, a planned door line portion or a fracture portion, and is weaker than the planned door portion 32 and the outer shell portion 33. It is a weak part that can be broken and easily deformed. The tear line 31 can have any shape as long as the airbag 17 can be deployed with desired deployment characteristics, but in the present embodiment, the substantially central portion of the facing portion 25 is elongated along the vehicle width direction. A straight portion 31a serving as a first tear portion extending linearly and end section line portions 31b and 31b serving as second tear portions extending linearly in the front-rear direction at both ends of the straight portion 31a are provided. It has a substantially H-shape. The tear line 31 is formed by the shape of the cavity of the mold at the time of injection molding, and is a groove having a triangular cross section that opens downward in an obtuse angle (FIG. 6). For example, the straight portion 31a has the smallest thickness dimension. It is a thin part. The notches 30, 30 are located on the extension of both ends of the straight portion 31a of the tear line 31. That is, the notches 30 and 30 are edge portions of the facing portion 25 facing the inner edge portion 13a of the opening portion 13 at positions on both ends of the straight portion 31a that are separated from both end portions of the straight portion 31a. The short sides 29 and 29 are cut out.

  Moreover, each door planned part 32 is a part which covers the expansion | swelling side of the airbag 17 folded and accommodated at normal time, and comprises the door parts 35 and 36 (FIG. 3) at the time of the expansion of the airbag 17. As shown in FIG. Each scheduled door portion 32 (door portions 35 and 36) can be formed in any shape as long as the airbag 17 can be deployed with desired deployment characteristics. In the present embodiment, each door scheduled portion 32 is partitioned by a tear line 31. It is formed in a square shape.

  The outer portion 33 is held by the instrument panel portion 12 without being deployed even when the airbag 17 is inflated, thereby concentrating stress on the tear line 31 and assisting the deployment of the door portions 35 and 36. In this form, a quadrangular frame surrounding each door planned portion 32 is formed. Further, although not shown in the drawing, the back surface side, which is the back surface side of the outer shell portion 33, is a locking projection for locking the cover body 18 to the instrument panel portion 12 via a clip or the like that is a locking member. A plurality of parts are provided. The clips arranged on these locking projections are supported on a support portion 13b (FIG. 1 (a)) extending from the inner edge portion 13a of the opening portion 13 of the instrument panel portion 12 to the inside of the opening portion 13. It is inserted into a locking hole (not shown) provided.

  The attachment piece 26 can be called a standing wall or a retainer attachment vertical wall, and is formed in, for example, a rectangular tube shape surrounding the tear line 31. Further, although not shown, a plurality of mounting holes, each of which is a mounting part and a rectangular square hole, are formed on the front and rear surfaces of the mounting piece 26, which are not shown in the figure. The provided hook 15b is locked, and the cover body 18 and the case body 15 are connected.

  The one and other skin bodies 22 and 23 cover the surface side of the facing portion 25 to improve the appearance and feel, and are formed into, for example, a rectangular sheet shape from natural leather, artificial leather, or soft resin. Has been. These one and other skin bodies 22 and 23 may be made of the same material or different materials. One epidermis 22 covers the entire front side, which is one side of the straight portion 31 a of the tear line 31, of the facing portion 25. Further, the other epidermis 23 covers the entire rear side that is the other side of the straight portion 31a of the tear line 31 in the facing portion 25. Further, the one and other epidermis bodies 22 and 23 have one and other joint portions 41 and 42 joined to each other at the positions of the edge portions facing each other along the position of the straight portion 31a of the tear line 31. . These one and other joint portions 41 and 42 are one and other entangled portions that are folded and overlapped on the surface of the facing portion 25 that is the back side of the one and other skin bodies 22 and 23, and the facing portion. With respect to the surface of 25, it protrudes from the other part of one and other epidermis bodies 22 and 23 (upward). Further, in the present embodiment, these one and other joint portions 41 and 42 are joined to each other via a sewing portion 44 straddling the straight portion 31a of the tear line 31. The sewing portion 44 is provided so that it can be broken by the inflation pressure of the airbag 17 that breaks the tear line 31.

  In addition, the first and other first covering portions 46 and 47 that cover the long side portions 28 and 28 of the facing portion 25 by covering the long side portions 28 and 28 of the facing portion 25 to the back surface side, and the short side of the facing portion 25 One second covering portion 48, 48 and the other second covering portion 49, 49 are provided to cover and cover the portions 29, 29 to the back side. Accordingly, the end portions 41a and 42a of the one and other joint portions 41 and 42 constitute one second covering portion 48 and another second covering portion 49, respectively. , 23 is a portion that is double-folded and wound (FIG. 2), is folded back and accommodated in the notch 30, and is one with respect to the short side 29 that is the outer edge of the facing portion 25. It does not protrude outward (inner edge portion 13a side of the opening 13) beyond the thickness of the other skin bodies 22, 23 (FIG. 1 (b)). Further, the one and other epidermis bodies 22 and 23 are separated from the one and other joint portions 41 and 42, respectively, along the one and other joint portions 41 and 42, respectively. One and other stitch portions 51 and 52, which are the decorative stitch portions, are provided. In addition, these one and other skin bodies 22 and 23 may be insert-molded integrally with the cover body 21, for example, or may be attached to the separately formed cover body 21 in a later step.

  Then, when the airbag device 10 is operated from the state shown in FIG. 6 and gas is injected from the inflator to the airbag 17 and the airbag 17 is expanded, that is, inflated and deployed, the airbag 17 is expanded in the case body 15. When the inflation pressure pushes up the planned door portions 32 and 32, the inflation pressure of the airbag 17 acts on the tear line 31, and the planned door portions 32 and 32 protrude so as to gradually bulge from both sides to the center portion. To go. According to this bulge, the one and other epidermis bodies 22 and 23 are pulled back and forth by the planned door portions 32 and 32, and the end portions of the one and other joint portions 41 and 42 housed in the cutout portions 30 and 30, respectively. 41a and 42a are pulled out from the notches 30 and 30, and at one and the other joints 41 and 42 located along the straight portion 31a of the tear line 31 and the other joint portions 41 and 42, the sewing portion Stress concentrates on 44 and the sewn portion 44 starts to break. Then, as the entire tear line 31 is broken, the sewing portion 44 is broken, and the one and other skin bodies 22, 23 are separated at positions other than the end portions 41a, 42a of the one and other joint portions 41, 42, and the door is scheduled. The parts 32, 32 are cut off at the positions of the tear line 31 (the straight line part 31a and the end parting line parts 31b, 31b) to form door parts 35, 36, and these door parts 35, 36 rotate, that is, expand ( 3), the airbag 17 is inflated.

  Thus, according to the present embodiment, the inner edge portion 13a of the opening portion 13 of the instrument panel portion 12 at a position on the extension of at least one end portion of the tear line 31 (straight portion 31a) of the facing portion 25. A cutout portion 30 is formed in the edge portion facing the cutout portion 30, and the tearline 31 of one and other epidermis bodies 22 and 23 covering one side and the other side of the tearline 31 (straight portion 31a) of the opposed portion 25 of the cover body 21 is formed. One and the other joints 41 and 42 located at the edge opposite to the (straight line portion 31a) are folded back to the back side, and the respective end portions 41a and 42a are folded back into the cutout portion 30 and stored. The gap between the facing portion 25 at the position of 41a, 42a and the inner edge portion 13a of the opening portion 13 is enlarged to release one and the other skin bodies 22, 23, and the facing portion 25 of these end portions 41a, 42a It is possible to weaken pinching with the inner edge portion 13a of the opening 13 and suppress crushing. Therefore, the end portions 41a and 42a of the one and other joint portions 41 and 42 are easily pulled out by the door portions 35 and 36 that are deployed when the airbag 17 is inflated, and the one and other skin bodies 22 and 23 are the door portion 35. , 36 are difficult to pull at the positions of the end portions 41a, 42a, and the deployment operation (opening) of the door portions 35, 36 is difficult to be obstructed. 17 desired development characteristics can be obtained.

  In particular, the notches 30 are notched at the edges of the facing portion 25 facing the opening 13 at the positions of both ends of the straight portion 31a of the tear line 31, so that both ends of the one and other joint portions 41 and 42 are formed. By storing the portions 41a and 42a in these cutout portions 30, the door portions 35 and 36 that are deployed when the airbag 17 is inflated can easily pull out both end portions 41a and 42a of one and the other joint portions 41 and 42. The deployment operation of the door portions 35 and 36 is less likely to be hindered, and the desired deployment characteristics of the airbag 17 can be more easily obtained without subjecting one and the other skin bodies 22 and 23 to separate processing.

  In addition, at least one of the one and other joint portions 41 and 42 is folded and wound on the back side of the one and other epidermis bodies 22 and 23 in the present embodiment, so that the aesthetic appearance is not impaired. .

  In addition, since it is not necessary to separately process one and the other skin bodies 22 and 23, the configuration can be realized without introducing new equipment, and the airbag 17 (door portions 35 and 36) can be deployed. Therefore, it is not necessary to carry out a tearing process for facilitating the breakage. Therefore, it is possible to apply even a synthetic leather whose maintenance of strength is not easy when such a tearing process is performed. , 23 materials can be selected widely.

  Next, a second embodiment will be described with reference to FIG. In addition, about the structure and effect | action similar to said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The second embodiment is a driver's seat (driver) airbag device in which the airbag device 10 is attached to a steering wheel 55 that is a handle.

  A steering wheel 55 shown in FIG. 7B includes a boss portion 57 connected to a steering shaft (not shown) that is a steering device, and an annular rim portion 58 as a gripping portion positioned around the boss portion 57. A spoke portion 59 that connects the boss portion 57 and the rim portion 58 is provided, and a position between the spoke portions 59 on the boss portion 57 is an installation portion 60 where the airbag device 10 is installed. In the present embodiment, three spoke portions 59 are set, for example, the upper left and right sides and the lower side of the central portion in the left-right direction.

  Further, in the cover body 18 of the airbag device 10 shown in FIG. 7A, the facing portion 25 is formed substantially along the shape of the boss portion 57, for example, and covers a part of the boss portion 57 and the spoke portion 59. An emblem 62 as a decorative member is attached to the facing portion 25. The emblem 62 is not an essential configuration. Further, the tear line 31 is formed in the facing portion 25 along the left-right direction (9 o'clock to 3 o'clock direction) that is the vehicle width direction while avoiding the emblem 62. That is, the tear line 31 is formed, for example, by connecting the straight portions 31c, 31c extending linearly along the vehicle width direction, for example, to form an arcuate detour portion 31d that bypasses the emblem 62, and the straight portions 31c, 31c End partition line portions 31e and 31e extending along the outer edge portion of the facing portion 25 are formed at the end opposite to the bypass portion 31d and intersecting the straight portions 31c and 31c. Then, notches 30 and 30 are formed by being separated from the ends of the straight portions 31c and 31c at positions on the extension of the ends of the straight portions 31c and 31c opposite to the bypass portions 31d and 31d. . That is, the notches 30 and 30 are located on the left and right side portions of the facing portion 25. In the present embodiment, the notched portions 30 and 30 face the positions of the spoke portions 59 and 59 on the left and right sides above the steering wheel 55 in the installation portion 60. (FIG. 7B).

  Further, the one and other epidermis bodies 22 and 23 are arranged so as to cover the upper and lower sides of the tear line 31 of the facing portion 25, and the left and right end portions 41a and 42a of the one and other joint portions 41 and 42 are cut out. The parts 30 and 30 are folded and stored.

  Even in this configuration, the end portions 41a and 42a of one and the other joint portions 41 and 42 sandwiched between the facing portion 25 and the installation portion 60 (upper spoke portions 59 and 59) are notched portions 30. , 30 and retracted to increase the clearance between the opposed portion 25 and the installed portion 60 (upper spoke portions 59, 59) at the positions of these end portions 41a, 42a, and to end these end portions. One and other joints by door portions 35 and 36 which are developed when the airbag 17 is inflated, weakening the pinching between the facing portion 25 of 41a and 42a and the installed portion 60 (upper spoke portions 59 and 59) The end portions 41a and 42a of the 41 and 42 can be easily pulled out, and the same effects as those in the first embodiment can be obtained.

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

  In the third embodiment, the tear line 31 of the cover body 18 of the airbag device 10 attached to the steering wheel 55 of the second embodiment is formed along, for example, the vertical direction (12: 00-6 o'clock direction). It is what has been.

  That is, in the present embodiment, as shown in FIG. 8A, the tear line 31 connects, for example, the straight portions 31c and 31c extending linearly along the vertical direction, and bypasses the emblem 62, for example, a circle. An arc-shaped detour portion 31d is formed, and an end section line portion that extends along the outer edge portion of the facing portion 25 intersects with the straight portion 31c at the end opposite to the detour portion 31d of the lower straight portion 31c. 31e is formed. A cutout portion 30 is cut out at a position on the extension of the lower end portion on the side opposite to the bypass portion 31d of the lower straight portion 31c so as to be separated from the end portion of the straight portion 31c. That is, the notch 30 is located below the central portion in the left-right direction of the facing portion 25. In the present embodiment, the notched portion 30 faces the position of the spoke portion 59 below the steering wheel 55 in the installed portion 60. (FIG. 8B).

  Further, the one and other epidermis bodies 22 and 23 are disposed so as to cover the left side and the right side of the tear line 31 of the facing portion 25, and the lower end portions 41a and 42a of the one and other joint portions 41 and 42 are notched portions. It is folded back to 30 and stored. Note that it is not necessary to provide the notch portion 30 in the facing portion 25 particularly for the upper end portions 41a and 42a of the one and other joint portions 41 and 42 that are not sandwiched between the installed portion 60 and the other portion 41 and 42.

  Even in this configuration, the end portions 41a and 42a of one and the other joint portions 41 and 42 sandwiched between the facing portion 25 and the installation portion 60 (lower spoke portion 59) are formed in the cutout portion 30. By folding back and storing, the gap between the facing portion 25 and the portion to be installed 60 (the lower spoke portion 59) at the positions of the end portions 41a and 42a is increased, and the end portions 41a and 42a The end of one and the other joints 41 and 42 is weakened by the doors 35 and 36 that are expanded when the airbag 17 is inflated, and the sandwiching between the facing part 25 and the installed part 60 (lower spoke part 59) is weakened. The portions 41a and 42a can be easily pulled out, and the same effects as those of the above-described embodiments can be achieved.

  And as shown in said 2nd and 3rd embodiment, the tear line 31 does not need to be linear shape, The curve part may be included in part, and the whole is curved shape. Also good.

  In the second and third embodiments described above, the rim portion 58 of the steering wheel 55 does not have to be annular, and has various shapes such as a shape formed along a part of the arc. be able to.

  Further, the number of spoke portions 59 is not limited to three, and may be four or two. Even in this case, the same effect can be obtained by setting the tear line 31 and the cutout portion 30 so as to be located at the position facing the spoke portion 59 in the installed portion 60 at the edge of the facing portion 25 of the cover body 18. Can play.

  Further, in each of the above-described embodiments, one and the other joint portions 41 and 42 of the one and other epidermis bodies 22 and 23 are not only folded back so as to be wound around the back side, but at least one of them is a back surface. As long as it is bent to the side and joined to each other on the back side of one and the other skin bodies 22 and 23, any form can be adopted, such as overlapping the other on one back side. For example, as in the fourth embodiment shown in FIG. 9, another joint 42 is wound around the back side of the other skin body 23, and one joint 41 is overlapped with the back side of the other joint 42. Alternatively, the sewing portion 44 may be joined in the thickness direction. In this case, the notch 30 can be asymmetric.

  Furthermore, for example, when one and the other joints 41 and 42 are bent at a substantially right angle toward the back side and adjacent to each other and joined together by the sewing part 44, the shape of the notch 30 is shown in FIG. As in the fifth embodiment shown, it may be a simple rectangular shape (square shape) that does not expand outward of the facing portion 25. In this case, it is only necessary to form the cutout portion 30 only for the thickness of one and other epidermis bodies 22 and 23, and the cutout portion 30 can be further downsized. By continuously forming the groove portion along the tear line 31, the one and other joint portions 41 and 42 are made to follow the surface of the facing portion 25 in the same manner as the other portions of the one and other skin bodies 22 and 23. Can do.

  Further, the shape of the notch 30 may be a triangular shape expanding toward the outside of the facing portion 25, for example, as in the sixth embodiment shown in FIG. In this case, the cutout portion 30 may have a substantially symmetrical shape (isosceles triangle shape) according to the shape of the end portions 41a and 42a of the one and other joint portions 41 and 42 accommodated in the cutout portion 30. Alternatively, the shape may be asymmetrical with different side slopes.

  Furthermore, the shape of the notch 30 may be, for example, an arc shape (semi-arc shape) as in the seventh embodiment shown in FIG. In this case, depending on the shape of the end portions 41a and 42a of the one and other joint portions 41 and 42 housed in the cutout portion 30, a symmetrical shape may be used, or an asymmetric shape such as a partial curvature being different. It is good. In addition, the cutout portion 30 may have an elliptical shape or the like, or may have a shape having a linear portion or the like in part.

  That is, as the shape of the cutout portion 30, various forms are possible as long as the end portions 41a and 42a of the one and other joint portions 41 and 42 can be accommodated without difficulty.

  In each of the above embodiments, the number of epidermis bodies is not limited to two, and three or more epidermis bodies can be used. Also in this case, the same effect can be obtained by storing the end portion of the joint portion between the epidermis by the notch.

  The present invention can be suitably used as an airbag device for a passenger seat or a driver seat, for example.

10 Airbag device
13 Opening as installed part
17 airbag
18 Cover body
21 Cover body
22 One epidermis
23 Other epidermis
25 Opposite part
30 Notch
31 Tearline
31a Straight section
35, 36 Door
41 One joint
42 Other joints
60 Installation area

Claims (2)

A facing portion that is fitted to the installation portion and covers the stored airbag, and is provided at the facing portion. The tear line is defined by the facing portion and is split when the airbag is inflated and deployed to form a plurality of door portions. And a cover main body provided with a notch formed by cutting out at an edge of the facing portion facing the installation portion at a position on an extension of at least one end of the tear line,
One epidermis covering one side of the tear line of the facing portion of the cover body;
With other epidermis covering the other side of the tear line of the facing portion of the cover body,
The one and other epidermis bodies have one and other joints joined to each other at an edge facing the tear line;
A cover body for an airbag device, wherein at least one of the one and other joints is bent to the back side and each end is folded back and stored in the notch. The tear line has a straight portion formed in a straight line,
The cover body of an airbag device according to claim 1, wherein the cutout portions are formed in the edge portions of the facing portions facing the installation portion at positions of both end portions of the straight portion of the tear line. .

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