JP6239348B2 - Airbag device - Google Patents

Description

  The present invention relates to an airbag device.

  Patent Document 1 describes an airbag device that is attached to a steering wheel of a vehicle. The airbag device includes an airbag, a wrapping sheet that wraps the airbag, and a cover that stores the airbag wrapped in the wrapping sheet. The wrapping sheet is formed with a planned breaking line that is broken when the airbag is inflated and deployed, and the cover is formed with a tear line that is broken when the airbag is inflated and deployed. When the airbag is inflated, the planned break line and the tear line break. The wrapping cross is opened by the breakage of the planned break line, and a plurality of development portions are formed in the cover by the break of the tear line, and an opening portion is formed in the cover by opening the plurality of development portions. The airbag is inflated and deployed toward the driver through this opening.

  Moreover, in patent document 1, the emblem is attached to one of the expansion | deployment parts. The emblem here forms a design pattern, and is formed by a member different from the cover.

  In Patent Document 2, the emblem can be attached to a cover (one of the developing portions) as follows, for example. For example, the mounting portion protrudes from the back surface of the emblem and a through hole is provided in the cover. And an attachment part is penetrated to a through-hole, and an emblem is attached to a cover through this attachment part. The attachment portion is configured to attach the emblem to the cover by thermally deforming the tip.

JP 2009-56963 A JP 2001-162997 A

  However, when the attachment portion extends to the back surface of the cover, the wrapping sheet is interposed between the airbag and the cover, so that the wrapping sheet is attached to the attachment portion at the initial stage when the airbag is inflated and deployed. However, in Patent Document 1, the wrapping sheet has a shape in which the position where the emblem is attached is divided into four central directions. Further, since the mounting portion is short with respect to the deployed portion, as the airbag is inflated and deployed, the divided wrapping sheet cannot cover the mounting portion, and the airbag can directly contact the mounting portion. When the airbag and the attachment portion are in direct contact, friction due to the deployment of the airbag is generated between the airbag and the attachment portion, which may damage the attachment portion and remove the emblem from the cover.

  In view of this, the present invention directly interposes the airbag and the mounting portion by interposing a part of the wrapping sheet between the emblem mounting portion and the airbag from the initial stage of the airbag inflating and deploying until the airbag is completely inflated and deployed. It is an object of the present invention to provide an airbag device that can prevent the contact and prevent the attachment portion from being damaged.

1st aspect of the airbag apparatus concerning this invention is an airbag apparatus attached to a steering wheel, Comprising: The folded-up airbag, the inflator which inflate-deploys the said airbag, and the said folded-up whole airbag Wrapping material, a cover containing the airbag, the packaging material and the inflator, and a mounting portion penetrating the cover, and on the driver side surface of the cover via the mounting portion An emblem to be attached, and the cover is formed with a tear line and a cover unfolding portion that is partitioned by the tear line and opens when the airbag is inflated and deployed, and the emblem is formed by the cover unfolding portion. The package material is provided with a planned fracture line that breaks when the airbag is inflated and deployed. At least one open piece is formed by the planned break line, and the protective open piece that is one of the open pieces is seen from the back surface of the cover in a state where the airbag is not inflated and deployed, The cover is disposed so as to cover the attachment portion, and is completely covered and opened in a state of being overlapped with the cover expansion portion until the airbag has been inflated and deployed and has been inflated and deployed.

  A second aspect of the airbag device according to the present invention is the airbag device according to the first aspect, wherein both ends of the planned breaking line forming the protective opening piece are from hinge portions of the cover deployment portion. Is located on the opposite side of the mounting portion.

  A third aspect of the airbag apparatus according to the present invention is the airbag apparatus according to the first or second aspect, wherein a line connecting both ends of the planned breaking line forming the protective opening piece is the cover deployment. It is arrange | positioned in parallel with the hinge part of a part.

  A fourth aspect of the airbag apparatus according to the present invention is the airbag apparatus according to the second or third aspect, wherein the cover includes at least the hinge part side and both sides of the cover deployment part. A non-deployment portion adjacent to the cover deployment portion is formed, and a width of the cover deployment portion at the hinge portion is wider than a width of the protective opening piece corresponding to the hinge portion.

  A fifth aspect of the airbag apparatus according to the present invention is the airbag apparatus according to any one of the first to fourth aspects, wherein the planned breaking line forming the protective opening piece is the attachment portion. Is located outside the tear line forming the cover unfolding portion.

  A sixth aspect of the airbag device according to the present invention is the airbag device according to any one of the first to fifth aspects, wherein the cover has a non-deployment portion adjacent to the cover deployment portion. In the packaging material, a peripheral edge cover piece is formed by the planned break line adjacent to the open piece, and the peripheral edge cover piece is viewed from the back surface of the cover, Cover at least a part of the peripheral edge of the non-deployed portion.

  According to the first aspect of the airbag device according to the present invention, since the protective opening piece can cover the mounting portion from the initial stage of inflation of the airbag to the complete inflating and deploying, the direct connection between the mounting portion and the airbag is possible. Contact can be prevented.

  According to the second aspect of the airbag apparatus according to the present invention, the protective opening piece can also come into contact with the hinge-side portion of the cover deployment portion, so that the force from the airbag is also applied to this portion appropriately. Can be made. Therefore, the protective opening piece can be easily opened appropriately.

  According to the third aspect of the airbag apparatus according to the present invention, since both ends of the planned break line are arranged at equal intervals from the hinge portion, the protective opening piece is stably deployed in the same direction as the deployment portion. be able to. Therefore, the open piece can stably cover the mounting portion until the airbag is fully inflated and deployed.

  According to the 4th aspect of the airbag apparatus concerning this invention, since the said part of a protection open piece does not contact a non-deployment part, the force from an airbag can be made to act on a cover deployment part efficiently. .

  According to the 5th aspect of the airbag apparatus concerning this invention, a protection open piece can cover an attachment part more reliably, and a direct contact with an attachment part and an airbag can be prevented.

  According to the sixth aspect of the airbag apparatus according to the present invention, the peripheral edge cover piece covers the peripheral edge of the non-deployment part, and therefore the peripheral part of the non-deployment part can be prevented from contacting the airbag. .

It is a disassembled perspective view which shows a conceptual example of the steering wheel and airbag apparatus which concern on embodiment. It is a disassembled perspective view which shows a conceptual example of a steering wheel and an airbag apparatus same as the above. It is a top view which shows an example of the conceptual structure of the cover seen from the driver side. It is a top view which shows an example of a notional structure of the cover seen from the steering wheel side. It is sectional drawing which shows an example of a conceptual structure of a cover. It is sectional drawing which shows an example of a conceptual structure of a cover. It is a top view which shows typically a mode that the expansion | deployment part of the cover opened. It is sectional drawing which shows a conceptual example of an airbag apparatus. It is a perspective view which shows an example of a notional structure of a cover and a wrapping cloth. It is a top view which shows an example of a notional structure of a wrapping cloth. It is a top view which shows an example of a notional structure of a wrapping cloth. It is a top view which shows an example of a notional structure of a cover and a wrapping cloth. It is sectional drawing which shows an example of a notional structure of an airbag apparatus when an airbag expand | swells and expands. It is a top view which shows typically a mode that the expansion | deployment part of the cover opened. It is a top view which shows typically a mode that the expansion | deployment part of the cover opened. It is sectional drawing which shows typically a mode that the airbag was inflate-deployed. It is a top view which shows an example of a notional structure of a cover and a wrapping cloth.

  Hereinafter, the airbag apparatus according to the embodiment will be described. 1 and 2 are exploded perspective views showing the steering wheel 10 and the airbag device 30. FIG.

<1. Overall Configuration of Steering Wheel 10 and Airbag Device 30>
The airbag device 30 is configured to be attachable to a steering wheel 10 in a vehicle. Below, the whole structure of the steering wheel 10 and the airbag apparatus 30 is demonstrated roughly.

<1-1. Steering wheel>
The steering wheel 10 is for steering the vehicle, and includes a wheel body 12, spokes 14, and a central member 16. The wheel main body 12 is formed in a ring shape and is a portion that receives a steering force by a person. The central member 16 is configured to be connectable to a distal end portion of a steering shaft that extends in a direction away from the driver. The spoke 14 extends from the inner peripheral portion of the wheel body 12 toward the center thereof, and is connected to the central member 16 at the center. Here, three spokes 14 are provided, but two or the like may be provided. When the steering wheel 10 is rotated, the rotational motion is transmitted to the steering shaft via the spoke 14 and the central member 16.

  The central member 16 is provided with an attachment structure for fixing the airbag device 30 and the steering wheel 10. For example, the central member 16 is provided with an attachment protrusion 162 and an attachment recess 164. The mounting protrusion 162 protrudes toward the driver. Further, the attachment protrusion 162 has a claw portion at the tip end side, and is engaged with an engagement body 60 (see FIG. 2) provided in the airbag device 30. Referring to FIG. 1 again, the mounting recess 164 is recessed in the central member 16 and opens to the driver side. An attachment insertion member 25 fixed to the airbag device 30 is inserted into the attachment recess 164, and the attachment recess 164 and the attachment insertion member 25 are fixed to each other. The locking body 60 and the attachment insertion member 25 will be described later.

  The central member 16 is provided with a horn contact 166. The horn contact 166 is for sounding a so-called horn. The airbag device 30 is fixed to the steering wheel 10 so as to be pushable from the driver side. When the driver pushes the airbag device 30, the horn contact 166 becomes a horn contact 72 provided in the airbag device 30. The horn sounds by this contact.

<1-2. Airbag device>
The airbag device 30 includes an airbag 32, an inflator 34, a cover 36, a mounting plate 40, a locking body 60, and a horn conductor 70.

  The airbag 32 is formed in a bag shape with cloth or the like, and is folded so as to be accommodated in the cover 36.

  The inflator 34 is a device that inflates and deploys the airbag 32. Here, the inflator 34 has a short cylindrical inflator body 34a and a mounting flange 34b formed on the outer periphery of the inflator body 34a. The inflator body 34a incorporates an ignition device, a gas generating agent, and the like. And when the detection signal etc. from an impact detection part etc. are received at the time of a vehicle collision, the said ignition device will ignite a gas generating agent. As a result, the gas generating agent burns, and the gas generated by this combustion is supplied into the airbag 32. As a result, the airbag 32 is inflated and deployed toward the driver. The attachment flange 34b is formed in a plate shape extending so that the outer peripheral edge forms a square shape, and fixing holes 34c are formed at four corner portions thereof.

  The cover 36 is a member formed of resin or the like, and includes a cover main body portion 37 and a standing wall 38. The cover main body portion 37 is a portion that forms the front surface of the steering device (the steering wheel with an airbag) in a state where the airbag device 30 is attached and fixed to the steering wheel 10. The cover main body 37 covers the folded airbag 32 from one side (the side opposite to the steering wheel 10). The standing wall 38 protrudes from the cover main body 37 so as to surround the airbag 32 folded on the inner surface side of the cover main body 37. Here, the standing wall 38 is formed in a rectangular tube shape, but may be formed in a cylindrical shape or a shape that partially surrounds the airbag 32. The folded airbag 32 is accommodated in a space surrounded by the cover main body 37 and the standing wall 38. The cover main body portion 37 is formed with a tear line that is broken by receiving the inflating and deploying force of the airbag 32.

  The attachment plate 40 is attached to the airbag 32 so as to close the opening of the standing wall 38 in a state where the inflator 34 is attached.

  The mounting plate 40 is formed as a plate-like member having a shape along the outer periphery of the standing wall 38, for example. Here, the mounting plate 40 has a plate portion 42 having a peripheral edge having the same shape as the opening of the standing wall 38, and a peripheral wall 48 formed on the outer periphery of the plate portion 42. The peripheral wall 48 is fitted on the standing wall 38.

  An opening 42h is formed at the center of the plate portion 42, and the inflator 34 is disposed in the opening 42h.

  In addition, a screw insertion hole 42c is formed around the opening 42h in the plate portion 42, and the inflator 34 and the airbag 32 are attached as follows using the screw insertion hole 42c. First, the sandwiching bracket 50 is attached to the airbag 32. Although FIGS. 1 and 2 show the airbag 32 and the sandwiching bracket 50 separately, the opening edge of the airbag 32 actually covers the periphery of the sandwiching bracket 50 from the steering wheel 10 side. ing. That is, the sandwiching bracket 50 is disposed inside the airbag 32.

  The sandwiching bracket 50 is a member formed of a metal plate or the like, and is formed in a plate shape here. An opening 50 h in which the inflator 34 can be disposed is formed at the center of the sandwiching bracket 50. Moreover, the thread part 51 is protrudingly provided in each corner | angular part of the clamping bracket 50 (refer FIG. 2). Each screw portion 51 protrudes out of the airbag 32 through a hole 32 c formed in the opening edge of the airbag 32. The airbag 32 is fixed to the sandwiching bracket 50 by the screw portion 51 passing through the opening edge.

  Further, a claw portion 381 is formed on the standing wall 38 of the cover 36, and the claw portion 381 and the periphery of the sandwiching bracket 50 covered with the airbag 32 are locked from the outside of the airbag 32. . Thereby, the cover 36 is fixed to the sandwiching bracket 50.

  A screw insertion hole 42 c is formed in the mounting plate 40 at a position corresponding to the screw portion 51. The attachment plate 40 can be attached to the sandwiching bracket 50 by screwing and fastening a nut 52 (see FIG. 1) to the screw portion 51 in a state where the screw portion 51 passes through the screw insertion hole 42c.

  However, here, the inflator 34 and the horn conductor 70 are also attached using the screw portion 51 and the nut 52.

  The horn conductor 70 is, for example, a plate-shaped metal member. A horn contact 72 is formed in the horn conductor 70 at a position corresponding to the horn contact 166 of the steering wheel 10, and a fixing hole 70c is formed at a position corresponding to the screw insertion hole 42c.

  The horn conductor 70 is disposed so as to overlap the mounting plate 40 with the fixing hole 70c disposed at the same position as the screw insertion hole 42c.

  In addition, the inflator main body 34a is disposed in the opening 42h of the mounting plate 40, and the mounting flange 34b has the fixing hole 34c disposed at the same position as the screw insertion hole 42c. The horn conductor 70) is disposed so as to overlap the steering wheel 10 side.

  In this state, the sandwiching bracket 50 is superimposed on the mounting plate 40 so that each screw portion 51 protrudes from the mounting plate 40 through the screw insertion hole 42c and the fixing holes 34c and 70c. Then, a nut 52 is screwed and fastened to each screw portion 51 protruding from the mounting plate 40. Thereby, the inflator 34 and the horn conductor 70 are attached and fixed to the attachment plate 40, and the cover 36 and the airbag 32 are attached and fixed to the attachment plate 40. In this state, at least a part of the inflator 34 is disposed in the airbag 32.

  The mounting plate 40 is provided with a mounting structure for mounting and fixing the airbag device 30 to the steering wheel 10. Here, the airbag device 30 is attached to the steering wheel 10 using the attachment insertion member 25 and the locking body 60.

  The attachment insertion member 25 is fixed to the attachment plate 40 (more specifically, the plate portion 42) via the coil spring 251. The coil spring 251 is fitted on the cylindrical portion of the attachment insertion member 25 and abuts on a flange portion formed on the cylindrical portion. On the other hand, a pair of column portions 422 are projected from the plate portion 42, and claw portions are provided at the tips of the pair of column portions 422. This column part 422 passes between the cylindrical part of the attachment insertion member 25 and the coil spring, for example, and is hooked on the edge part of the latching | locking part provided in the attachment insertion member 25. FIG. As a result, the attachment insertion member 25 is attached to the attachment plate 40. The coil spring 251 is also in contact with the plate portion 24 and biases the attachment insertion member 25 and the plate portion 42 in a direction away from each other.

  The attachment insertion member 25 can approach the plate portion 42 by receiving an external force. At this time, the coil spring 251 is contracted by an external force. When the external force disappears, the attachment insertion member 25 returns to the original position by the urging force of the coil spring 251.

  Further, the attachment insertion member 25 is fixed to the attachment recess 164 of the steering wheel 10. For example, the attachment insertion member 25 has a flange portion provided at the tip of the cylindrical portion (the end portion on the steering wheel 10 side with respect to the flange portion). On the other hand, a groove is formed at the bottom periphery of the mounting recess 164. Then, in a state where the attachment insertion member 25 is inserted into the attachment recess 164, the flange portion is fitted and locked in the groove portion. Thereby, the attachment insertion member 25 is fixed to the attachment recess 164.

  With this structure, the airbag device 30 can move toward the steering wheel 10 by receiving an external force from the driver. When the horn contact 72 of the airbag device 30 contacts the horn contact 166 of the steering wheel 10, the horn sounds. If the external force disappears, the airbag device 30 returns to the original position by the biasing force of the coil spring 251.

  Further, a structure (locking body 60) different from the above mounting structure is provided on the mounting plate 40. This is to prepare for the following situation, for example. That is, when the airbag 32 is inflated and deployed, a large collision force or an inflated and deployed force of the airbag is generated. As a result, a situation may occur in which the attachment insertion member 25 and the attachment recess 164 are fixed, or the attachment insertion member 25 and the plate portion 24 are fixed. Therefore, even if such a situation occurs, the airbag device 30 and the steering wheel 10 are kept fixed by another structure.

  The locking body 60 is an elastically deformable linear body, for example, a metal wire. The locking body 60 is supported by the mounting plate 40 and is locked with the mounting protrusion 162. Note that the locking body 60 need not always be in contact with the mounting protrusion 162 and locked. The locking body 60 may be in contact with the mounting protrusion 162 when the fixing portion by the mounting insertion member 25 is damaged, and the fixing of the airbag device 30 and the steering wheel 10 may be maintained.

  In the present embodiment, the cover 36 and a packaging material (described later) that covers the folded airbag 32 will be described in more detail.

<2-1. Structure of cover 36>
<2-1-1. Emblem>
3 is a plan view showing an example of a conceptual configuration of the cover 36 when viewed from the driver side, and FIG. 4 is an example of a conceptual configuration of the cover 36 when viewed from the steering wheel 10 side. FIG. FIG. 5 shows a cross-sectional view of a part of the cover 36.

  In the following, for the sake of convenience of explanation, a front-rear direction (front and rear), a vertical direction (upper and lower), and a left and right direction (right and left) are set. Here, the front-rear direction is a direction along the normal of the main surface of the mounting plate 40 (the normal of the plate portion 42), and the vertical direction and the horizontal direction are the vertical direction when the driver looks at the airbag device 30 and Left and right direction.

  As shown in FIG. 3, an emblem 80 is attached to the surface of the cover main body 37 on the driver side. The emblem 80 is made of resin, for example, and forms a predetermined design as viewed from the driver side. However, in FIG. 3, in order to make the drawing easy to see, this design is omitted, and the emblem 80 is schematically shown as a circle. In FIG. 3, the emblem 80 is provided at substantially the center of the cover main body 37, but the position and size thereof can be changed as appropriate.

  As shown in FIGS. 4 and 5, a mounting portion 82 projects from the back surface of the emblem 80. Although the number and arrangement positions of the mounting portions 82 can be set as appropriate, in the illustration of FIG. 4, seven mounting portions 82 are provided, which are virtual regular hexagonal apexes and their regular hexagonal shapes. It is provided in the central part. The attachment portion 82 penetrates through a through hole formed in the cover main body portion 37 and protrudes to the back surface side (the steering wheel 10 side) of the cover main body portion 37. The emblem 80 is fixed to the cover main body portion 37 through the attachment portion 82. For example, as shown in FIG. 5, the attachment portion 82 has a rivet shape whose tip is wide and can be locked to the back surface of the cover main body portion 37.

  This mounting structure can be realized, for example, as follows. For example, after the columnar mounting portion 82 is passed through the through hole of the cover main body portion 37, the tip of the mounting portion 82 is deformed to form a rivet shape. Or the through-hole formed in the cover main-body part 37 before an assembly is larger than the cross section of the front-end | tip of the attaching part 82 which has a rivet shape, and the attaching part 82 can be loosely inserted. The cover main body portion 37 is provided with a resin protrusion protruding toward the steering wheel along the periphery of the through hole. The attachment portion 82 is disposed on the inner peripheral side of the cylindrical resin protrusion. In this state, at least a part of the resin protrusion is melted, and the gap formed between the attachment portion 82 and the cover main body portion 37 is filled with the resin. Thereby, the attachment structure in which the attachment part 82 is latched by the cover main-body part 37 is realizable.

  In addition, the attachment portion 82 is not limited to the shape of FIG. In such a structure, when the airbag 32 is inflated and deployed, the airbag 32 comes into contact with the attachment portion 82 and friction is generated between the airbag 32 and the attachment portion 82, thereby damaging the attachment portion 82. As a result, the emblem 80 may be detached from the cover 36. Therefore, in the present embodiment, direct contact between the airbag 32 and the attachment portion 82 is prevented at least from the initial stage of the inflation and deployment of the airbag 32 to the complete inflation and deployment of the airbag 32. It is intended to prevent the attachment portion 82 from being damaged due to friction generated between the attachment portion 82 and the airbag 32 due to the deployment. The complete inflating and deploying here means a state in which the inflating and deploying of the airbag 32 is completed and the performance of the airbag can be sufficiently exhibited.

<2-1-2. Tier Line>
As shown in FIGS. 3 and 4, a tear line group 84 is formed in the cover main body portion 37. The cover main body portion 37 has a structure that is easier to break than other portions in the tear line group 84. For example, the tear line group 84 is a portion of the cover main body portion 37 that is thinner than the thickness of the other portion (that is, Groove).

  In the example of FIGS. 3 and 4, a tier line 842 is formed as the tier line group 84. The tier line 842 has both ends 842a and 842b (see FIG. 3), and extends from the both ends 842a and 842b so as to surround the emblem 80. In other words, the emblem 80 is provided in the developing portion 862 defined by the tear line 842 in the cover main body portion 37. As will be described in detail later, the deploying portion 862 opens a portion between the both ends 842a and 842b as hinge portions when the airbag 32 is inflated and deployed (see also FIG. 6).

  In the illustration of FIG. 3, both ends 842 a and 842 b are separated in the left-right direction on the upper side of the cover main body portion 37. The tier line 842 includes, for example, three tier lines 8422, 8424, and 8426. The tear line 8422 extends downward from the end 842a, and the tear line 8426 extends downward from the end 842b. These tier lines 8422 and 8426 are located on opposite sides of the emblem 80. The tear line 8424 connects the tear lines 8422 and 8426 on the lower side of the emblem 80, and is formed in, for example, an arc shape so as to bulge downward.

  3 and 4, tear lines 843 to 848 are also formed in the cover body 37 as the tear line group 84. The tier line 843 extends from a part of the tier line 8422 on the end 842a side to the outer peripheral side (left side in the example of FIG. 3), and the tier line 844 extends from a part of the tier line 8426 on the end 842b side. It extends to the outer peripheral side (right side in the illustration of FIG. 3). The tier line 845 extends from the intersection of the tier lines 8422 and 8424 to the outer peripheral side (lower left side in the illustration of FIG. 3), and the tier line 846 extends from the intersection of the tier lines 8426 and 8424 (see FIG. 3). In the illustration, it extends to the lower right side). The tier line 847 extends from the middle point of the tier line 8424 to the outer peripheral side (the lower side in the example of FIG. 3), and the tier line 848 has one end of the tier line 847 (what is the tier line 8424) at its midpoint. Intersects one end of the opposite side) and extends in the left-right direction.

  The tear line 8424 located closer to the center of the cover main body 37 than the tear lines 845 to 848 is provided with a structure that is difficult to break than the tear lines 845 to 848. As such a hard-to-break structure, for example, a rib structure is adopted. 3 and 4, rib portions 88 are formed at a plurality of locations of the tear line 8424. FIG. 6 shows the cover main body 37 in a cross section along the tear line 8424. As shown in FIG. 6, the thickness of the tear line 8424 (thick portion) in the rib portion 88 is thicker than the thickness of the tear line 8424 in other positions. The rib portion 88 is thicker than the tear line 848. The thickness of the tear line 8424 (thin portion) at other positions is, for example, approximately the same as the thickness of the tear line 848. Accordingly, the cover main body portion 37 is not easily broken at the tear line 8424.

  The cover main body 37 is broken (cleaved) in the tear line group 84 by the inflation and deployment of the airbag 32. As a result, the development part surrounded by each of the tear line groups 84 opens as shown in FIG. For example, the development part 862 defined by the tear line 842 opens upward.

  3 and 7, the development part 863 defined by the tear lines 843, 845, and 8422 has a hinge part at a part connecting the end 843 a of the tear line 843 and the end 845 a of the tear line 845. Open to. The development portion 864 defined by the tear lines 845, 8424, 847, and 848 opens to the lower left side using a portion connecting the end 845a of the tear line 845 and the end 848a of the tear line 848 as a hinge portion. Since the development part 865 defined by the tear lines 8424, 846, 847, and 848 and the development part 866 defined by the tear lines 846, 8426, and 844 are also opened in the same manner, repeated description is avoided here.

  3 and 4, since the tear line group 84 is formed to be bilaterally symmetric, the development portions 862 to 866 are also opened bilaterally symmetric (FIG. 7). Then, the opening 376 for inflating and deploying the airbag 32 to the driver side is formed in the cover main body portion 37 by opening the respective deployment portions 862 to 866 (FIG. 7).

  The opening method of the expansion | deployment part 862,864,865 at this time is explained in full detail. In the present embodiment, as described above, the tear line 8424 located closer to the center than the tear lines 845 to 848 is provided with the rib portion 88 that is a structure that is difficult to break. Therefore, the cover main body portion 37 can be broken at the tear lines 845 to 848 with a force smaller than the force for breaking the cover main body portion 37 at the tear line 8424. Therefore, as shown in FIGS. 3 and 4, when the airbag 32 is inflated and deployed, the tear lines 845 to 848 of the cover body 37 are more likely to break than the tear line 8424. In particular, the tear line 845 to 848 breaks from the tear line 847 located on the center side.

  When the cover main body portion 37 is broken from the tear line 847, the developing portions 864 and 865 start to open, whereby the tear lines 8424 and 848 are broken, and then the tear lines 845 and 846 are broken, so that the developing portions 864 and 865 are completely Open to. At the same time as the tear lines 845 and 846 are broken, the tear lines 8422 and 8426 are also broken, thereby opening the development portion 862.

  Moreover, in the illustration of FIG. 8, the airbag 32 has the lower half folded in a roll shape. Therefore, the inflating and deploying force of the airbag 32 is easily applied to the lower side of the cover main body portion 37, and the cover main body portion 37 is more easily broken from the tear line 847.

  Note that the tear line is not necessarily formed in the manner shown in FIGS. 3 and 4, and the position, size, shape, and opening direction of each development portion can be changed as appropriate. In addition, the deployment portions 843 to 846 are not essential requirements for realizing the present embodiment, and may not be provided. As shown in FIGS. 3 and 4, if a plurality of development parts are formed, the length of the hinge part of each development part can be reduced, so that the force required to open each development part can be reduced.

  Further, in FIG. 3, both ends 842 a and 842 b are provided in a portion of the cover main body 37 that faces the driver in order to facilitate the illustration. However, as shown in FIG. 9, the cover main body portion 37 has an extending portion 378 extending from the upper peripheral edge so as to face the side portion of the wrapping cloth 35, and both ends 842 a and 842 b ( That is, a hinge portion) may be provided in the extending portion 378. Thereby, the expansion | deployment part 862 can be opened more largely and by extension, the opening part 376 can be made wider. This is preferable from the viewpoint of inflating and deploying the airbag 32 more widely. Below, the case where both ends 842a and 842b are provided in the extension part 378 first is described.

<2-2. Structure of Airbag 32>
The airbag 32 is stored in the cover 36 in a folded state. In order to maintain this folded state, the airbag 32 is covered with a predetermined packaging material (hereinafter referred to as a wrapping cloth). FIG. 10 is a plan view showing an example of a conceptual configuration of the wrapping cloth 35, as viewed from the driver side. FIG. 11 is a plan view when the wrapping cloth 35 is developed. In the illustration of FIG. 11, the airbag 32 and the sandwiching bracket 50 are also schematically shown.

  The wrapping cloth 35 is formed by, for example, one cloth sheet. As illustrated in FIG. 11, the wrapping cloth 35 has, for example, a substantially cross shape in the unfolded state, and has a central portion 354 and wing portions 356 provided on four sides of the central portion. doing. A through hole 358 is formed at the outer peripheral end of the wing 356. The wrapping cloth 35 is placed on the airbag 32 so that the four wings 356 are along the side of the airbag 32, and the outer peripheral side ends of the four wings 356 are covered with the airbag 32. The screw portion 51 is passed through the through hole 358 by extending to the back side of the sandwiched bracket 50. Thereby, the airbag 32 is covered while the wrapping cloth 35 is fixed to the sandwiching bracket 50. The wrapping cloth 35 can maintain the folded shape of the airbag 32.

  In addition, a planned fracture line 352 is formed on the wrapping cloth 35. When the airbag 32 is inflated and deployed, the wrapping cloth 35 breaks (breaks) along a planned break line 352. The planned fracture line 352 is formed by, for example, a plurality of cuts. The plurality of cuts are formed at a slight interval from each other and form a line as a whole. The slight distance functions as a connecting portion. When the airbag 32 is inflated and deployed, the connecting portion receives a force from the airbag 32 and breaks, so that the wrapping cloth 35 is cleaved.

  An open piece 353 (corresponding to the protective open piece in claim 1) is formed on the wrapping cloth 35 by the planned breaking line 352. The opening piece 353 is opened by the inflation and deployment of the airbag 32. With reference to FIGS. 9 and 11, the planned fracture line 352 has both ends 352 a and 352 b in the portion of the wrapping cross 35 that is the side portion facing the extending portion 378. The planned fracture line 352 extends from both ends 352a and 352b so as to surround a part of the central portion 354. The open piece 353 formed by the planned fracture line 352 can be bent and opened at a portion between both ends 352a and 352b. In addition, since the open piece 353 is made of cloth, it can be bent at an arbitrary position, but when opened from both ends 352a and 352b, it can be opened most greatly.

  Here, both ends 352a and 352b are spaced apart in the left-right direction, and the open piece 353 opens upward (see FIG. 10).

<2-3. Positional relationship between tear line and slit>
FIG. 12 is a plan view showing the cover 36 and the surface of the wrapping cloth 35 on the cover 36 side, as viewed from the steering wheel 10 side. However, the wrapping cloth 35 is shown as transparent. As shown in FIG. 12, all the mounting portions 82 are covered with an open piece 353 when viewed from the steering wheel 10 side (on the side opposite to the cover 36, more specifically on the side opposite to the cover main body portion 37). In addition, the distal end edge portion of the opening piece 353 is disposed outward from the distal end edge portion of the developing portion 862.

  Further, the opening piece 353 and the deployment portion 862 to which the emblem 80 is attached are opened in the same direction, for example, when the airbag 32 is inflated and deployed. Here, both the expansion | deployment part 862 and the open piece 353 open upwards seeing from a driver | operator.

  FIG. 13 shows a partial cross section of the airbag device 30 and shows a state where the airbag 32 is inflated and deployed. The open piece 353 and the deploying portion 862 are opened in the same direction by receiving a force from the inflating and deploying airbag 32. Therefore, even during the period in which the airbag 32 is inflated and deployed, it is possible to prevent the attachment portion 82 from being covered with the open piece 353 and the airbag 32 from directly contacting the attachment portion 82. In other words, the opening piece 353 can protect the attachment portion 82 from the airbag 32 until the airbag 32 is completely inflated and deployed. Therefore, it is possible to prevent friction due to the deployment of the airbag 32 between the airbag 32 and the attachment portion 82, and to prevent the attachment portion 82 from being damaged.

  Further, in the present embodiment, the attachment member 82 and the airbag 32 collide with each other via the wrapping cloth 35, so that the wrapping cloth 35 functions as a protective cloth, so that the airbag 32 is damaged by the attachment portion 82. Can be prevented.

  Unlike the present embodiment, when the opening piece 353 and the deployment portion 862 open in opposite directions, for example, the opening piece 353 covers the attachment portion 82 at the beginning of the period during which the airbag 32 is inflated and deployed. be able to. However, as the developing portion 862 and the open piece 353 are opened, the attachment portion 82 and the open piece 353 are separated from each other, so that the attachment portion 82 is exposed.

  Further, since the attachment portion 82 and the open piece 353 are relatively separated from each other, friction is generated between the attachment portion 82 and the open piece 353.

  On the other hand, in the present embodiment, since the opening piece 353 and the deployment portion 862 open in the same direction, the opening piece 353 and the attachment portion 82 are in a relatively long period of the period during which the airbag 32 is inflated and deployed. The open piece 353 continues to cover the mounting portion 82 without any friction between the two. That is, the attachment portion 82 and the airbag 32 can be protected over a relatively long period.

  The opening piece 353 is only required to completely cover the attachment portion 82 during the period from when the airbag 32 starts to be inflated and deployed until it is completely inflated and deployed. The height and position can be changed as appropriate. Here, “completely covering the attachment portion 82” means the following state. That is, for example, when one attachment portion 82 is provided, the open piece 353 covers the whole, not a part thereof, and when a plurality of attachment portions 82 are provided, the open piece 353 covers all of the plurality of attachment portions 82. Cover entirely.

<3-1. Positional relationship A between the hinge portion of the developing portion and the hinge portion of the open piece>
In the illustration of FIG. 9, the hinge portion 862 a of the deployment portion 862 is provided in the extending portion 378. In the illustration of FIG. 9, the hinge portion 862a is indicated by a two-dot chain line. Both ends 352a and 352b of the planned fracture line 352 forming the open piece 353 are provided on the side of the wrapping cross 35 that faces the extension 378. The both ends 352a and 352b are located on the rear side (steering wheel side) with respect to the hinge portion 862a.

  This is desirable in that a force from the airbag 32 is applied to the hinge portion 862a side portion of the deployment portion 862. That is, as shown in FIG. 13, since the opening piece 353 can be opened from the rear side of the hinge portion 862a of the developing portion 862, the opening piece 353 may hit the portion of the developing portion 862 on the hinge portion 862a side. it can. Therefore, the force from the airbag 32 can be appropriately applied to this portion, and as a result, the deployment portion 862 can be appropriately opened.

<3-2. Positional relationship B of hinge part of unfolded part and hinge part of open piece B>
In the above-described example, the hinge portion 862a of the developing portion 862 is provided in the extending portion 378 of the cover main body portion 37, and both ends 352a and 352b of the planned breaking line 352 forming the open piece 353 are the side portions of the wrapping cloth 35. Is provided. However, the present invention is not limited thereto, and the hinge portion 862a of the deployment portion 862 is provided on the surface portion of the cover main body portion 37 that faces the driver (see FIG. 3), and the expected fracture line 352 that forms the open piece 353 is formed. Both ends 352a and 352b may be provided in a central portion 354 facing the surface portion of the wrapping cloth 35. In this case, as shown in FIG. 14, it is desirable that both ends 352 a and 352 b of the planned fracture line 352 forming the open piece 353 are located on the opposite side of the deployment portion 862 with respect to the hinge portion 862 a of the deployment portion 862. In other words, it is desirable to be positioned on the outer peripheral side of the cover main body portion 37 with respect to the hinge portion 862a of the deployment portion 862.

  In the example of FIG. 14, when the development parts 862 to 866 and the open pieces 353 and 359 are actually developed, only the development parts 862 to 866 and the open piece 353 are developed. This is because the positional relationship between the peripheral portions of the non-deployed portions 882 and 884, which will be described in detail later, and the open piece 359 is schematically shown. In FIG. 14, the open piece 359 is hatched.

  Thus, when the airbag 32 is inflated and deployed, the opening piece 353 can hit the hinge portion 862a side of the deploying portion 862, so that the force from the airbag 32 is applied to the hinge portion of the deploying portion 862. It is possible to appropriately act up to the portion on the 862a side. Thereby, the expansion | deployment part 862 can be opened appropriately.

  In addition, the above-described positional relationships A and B can be collectively described as the both ends 352a and 352b being disposed on the opposite side of the developing portion 862 with respect to the hinge portion 862a.

  Referring to FIG. 9, a line connecting both ends 352a and 352b of the planned fracture line 352 forming the open piece 353 is provided in parallel with the hinge portion 862a of the development portion 862. In this case, the distances between the hinge portion 862a and both ends 352a and 352b of the planned fracture line 352 are equal.

  When the airbag 32 is inflated and deployed, the opening piece 353 is opened with a line connecting both ends 352a and 352b of the planned breaking line 352 forming the opening piece itself as a rotation axis, and comes into contact with the hinge portion 862a, thereby opening the opening piece 353. Overlaps the expanding portion 862. Therefore, since the opening piece 353 contacts the hinge portion 862a in the same direction, the opening piece 353 can be stably opened in the same direction as the deployment portion 862, and the opening piece 353 is attached to the attachment portion 82 until the airbag 32 is fully inflated and deployed. Can be covered stably.

<4. Shape of open piece>
3 and 9, the cover main body portion 37 is formed with non-deployed portions 882 and 884. The term “non-deployment portion” as used herein refers to a portion that is more difficult to open than the deployment portion when the airbag 32 is inflated and deployed, and is a portion that does not substantially open. Such a non-deployment part is formed by the cover main-body part 37 cleaving in a tear line. Therefore, the peripheral part of the non-deployment part is formed by a tear line.

  3 and 9, the non-deployment part 882 is formed by the tear lines 843 and 8422 for forming the development parts 862 and 863, and is adjacent to the development parts 862 and 863. The non-deployment part 884 is formed by tier lines 844 and 8426 for forming the development parts 862 and 866, and is adjacent to the development parts 862 and 866. These non-deployment parts 882 and 884 are formed on both sides of the development part 862.

  As shown in FIG. 14, the width W1 of the first portion located between the non-deployment portions 882 and 884 of the open piece 353 in the state where the deployment portion 862 and the open piece 353 are opened is the non-deployment portion 882. The interval between 884 (that is, the width of the expanded portion 862) is narrower than W2. Thereby, when the airbag 32 is inflated and deployed, the open piece 353 can be prevented from being caught by the non-deployed portions 882 and 884 or coming into contact with the peripheral portions of the non-deployed portions 882 and 884. If the open piece 353 is caught on the non-deployment portions 882 and 884 or abuts on the peripheral portions of the non-deployment portions 882 and 884, the force from the airbag 32 acting on the deployment portion 862 is reduced by friction or the like. Such a reduction can be avoided. In other words, the force from the airbag 32 can be applied to the deploying portion 862 efficiently.

  On the other hand, the width W3 of the portion (hereinafter also referred to as the tip side portion) that contacts the mounting portion 82 in the open piece 353 may be wider than the width W1. Thereby, it is easy to cover the attachment portion 82, and the airbag 32 can be more reliably protected from the attachment portion 82.

  14, the width W3 of the tip side portion of the opening piece 353 is wider than the width W2 of the portion of the development portion 862 where the mounting portion 82 is provided, as shown in FIG. I do not care. Thus, even when the opening piece 353 is slightly displaced during the inflation and deployment of the airbag 32, the attachment portion 82 can be covered.

  Further, in the illustration of FIG. 12, since there are development parts 863 and 866 on both sides of the development part 862, even if the width of the tip side portion of the opening piece 353 is slightly wider than the width of the development part 862, It does not get caught or abut on the development parts 863 and 866. Here, unlike the example of FIG. 12, the case where the portions corresponding to the expanded portions 863 and 866 are non-expanded portions is also considered. FIG. 15 schematically shows an example of the cover 36 and the opening piece 353 when the airbag 32 is inflated and deployed.

  In FIG. 15, the width W <b> 1 of the open piece 353 is narrower than the width W <b> 2 of the expanded portion 862, while the width W <b> 3 of the distal end portion of the open piece 353 is wider than the width W <b> 2 of the expanded portion 862. However, as shown in FIG. 15, the tip side portion of the open piece 353 can pass between the non-deployed portions. That is, when the tip side portion passes between the non-deployment portions, the peripheral portion of the non-deployment portion comes into contact with the influence of friction, but does not always contact the non-deployment portion. Therefore, it does not become a problem. On the other hand, unlike the illustration of FIG. 15, when the width W1 of the opening piece 353 is larger than the width W2 of the developing portion 862, the first portion of the opening piece 353 continues to contact the peripheral edge portion of the non-deploying portion. Therefore, here, the width W1 can be made narrower than the width W2, and the opening piece 353 can be deployed together with the deploying portion 862, and the force from the airbag can be efficiently applied to the deploying portion 862.

  In the illustration of FIG. 15, the open piece 353 covers the development portion 862 at least on the attachment portion 82 side. In other words, at least on the attachment portion 82 side, the planned fracture line 352 is located outward from the tear line 842. Thus, even when the opening piece 353 is slightly displaced during the inflation and deployment of the airbag 32, the attachment portion 82 can be covered.

<5. Non-development part and wrapping cloth>
With reference to FIGS. 3 and 14, for example, the non-deployment portions 882 and 884 are formed by the cover body portion 37 being cleaved at the tear line, so that the side surface (fracture side surface) of the peripheral portion is not flat, Unevenness is formed by cleavage. The peripheral portions of these non-deployed portions 882 and 884 are a part of the outline of the opening 376 formed in the cover main body portion 37 when the developed portions 862 to 866 are opened. When the airbag 32 is inflated and deployed, the airbag 32 can come into contact with the peripheral portions (breaking side surfaces) of the non-deployed portions 882 and 884. When the airbag 32 is in contact with the non-deployed portions 882 and 884 as described above, a large resistance is generated between the airbag 32 and the peripheral portions of the non-deployed portions 882 and 884 due to the unevenness of the broken side surfaces. There is a risk that the momentum of development will be impaired.

  Further, for example, the peripheral portion of the non-deployment portion 882 has a corner portion. In the illustration of FIG. 3, the tear lines 8422 and 843 are substantially orthogonal, and the development portions 862 and 866 open in different directions. Thereby, a corner | angular part is formed in the non-deployment part 882. FIG. A corner portion is similarly formed on the peripheral portion of the non-deployed portion 884. In this case, if the airbag 32 is in direct contact with the peripheral portions of the non-deployed portions 882 and 884, the airbag 32 is more easily damaged. In addition, the angle of a corner | angular part does not need to be a right angle, and may be an acute angle or an obtuse angle. In addition, the corner may be appropriately chamfered, rounded, or the like.

  Therefore, for example, as shown in FIGS. 10, 12, and 14, when the airbag 32 is inflated and deployed, an open piece 359 that covers the peripheral portion of the non-deployed portions 882 and 884 (corresponding to the peripheral portion cover piece of claim 6). Is formed on the wrapping cloth 35. The open pieces 359 are provided in pairs, for example, and correspond to the non-deployed portions 882 and 884, respectively. In the illustration of FIG. 12, these open pieces 359 are formed by a part of a planned breaking line 352 formed in the wrapping cloth 35 and are adjacent to the open pieces 353 in the left-right direction on the paper surface.

  The open piece 359 protrudes to the center side (inner peripheral side) of the cover main body portion 37 from the corresponding non-deployed portions 882 and 884. That is, the open piece 359 covers the peripheral edge portions of the corresponding non-deployment portions 882 and 884 when viewed from the steering wheel 10 side.

  These opening pieces 359 are broken at the planned breaking line 352 by the inflation and deployment of the airbag 32, and the opening pieces 359 adjacent to the distal end side of the opening pieces 353 are opened toward the developing portions 863, 866, and the opening pieces 353 are opened. The open pieces 359 adjacent to each other on the base side open to the corresponding non-deployed portions 882 and 884, respectively. On the other hand, since the non-deployment parts 882 and 884 hardly open, the open pieces 359 come into contact with the peripheral parts (breaking side surfaces) of the non-deployment parts 882 and 884, respectively. FIG. 16 is a cross-sectional view (A-A cross section in FIG. 14) schematically showing the vicinity of the non-deployment portions 882 and 884, and shows a state where the airbag 32 is inflated and deployed.

  As shown in FIG. 16, since the open piece 359 is interposed between the airbag 32 and the peripheral portions (breaking side surfaces) of the non-deployed portions 882 and 884, the airbag 32 has the peripheral portions of the non-deployed portions 882 and 884. Direct contact with the (breaking side surface) can be avoided. In other words, the open piece 359 can protect the airbag 32 from the peripheral edge portions (breaking side surfaces) of the non-deployed portions 882 and 884.

  In the illustration of FIG. 12, since the open piece 359 and the open piece 353 are adjacent in the left-right direction, the width between both ends 352a and 352b of the planned fracture line 352 forming the open piece 353 is reduced. By setting the planned fracture line 352, the open piece 359 formed by the planned fracture line 352 can be further expanded. Therefore, the open piece 359 can be widened by reducing the width of the open piece 353 so that the open piece 353 does not come into contact with the non-deployed portions 882 and 884. It becomes easier to cover the periphery.

  Here, as an example, the open piece 359 is developed as a whole, but only a part of the open piece 359 is deployed, and the part may be interposed between the non-deployed portions 882 and 884 and the airbag 32. good. For example, in FIG. 14, only the part 3591 which protrudes corresponding to the part where the width | variety of the open piece 353 becomes narrow among the open pieces 359 may expand | deploy. In this case, the portion 3591 can also be understood as a peripheral cover piece.

<6. Shape of open piece 359>
FIG. 17 is a diagram showing a conceptual example of the cover 36 and the surface of the wrapping cloth 35 on the cover 36 side, and the wrapping cloth 35 is shown as transparent. In the illustration of FIG. 17, the peripheral portion of the open piece 359 covering the non-deployment portion 882 on the non-deployment portion 882 side has a shape that is substantially similar (substantially parallel) to a part of the peripheral portion of the non-deployment portion 882. ing. In the illustration of FIG. 17, the peripheral portion of the open piece 359 on the non-deployment portion 882 side is formed by the planned break lines 3521 and 3522, and the planned break line 3521 is a part of the peripheral portion of the non-deployment portion 882. The tear line 8522 extends substantially parallel to the formed tear line 8422, and the planned break line 3522 extends substantially parallel to the tear line 843 that forms a part of the peripheral edge of the non-deployed portion 882. As a result, the peripheral portion of the open piece 359 on the non-deployed portion 882 side has a shape that is substantially similar (substantially parallel) to a part of the peripheral portion of the non-deployed portion 882. The same applies to the open piece 359 that covers the non-deployment portion 884.

  According to this, the peripheral part of the non-deployment part 882 can be covered without waste. In other words, the open piece 359 is not unnecessarily spread. Therefore, the area of the part (for example, open piece 353) used among the wrapping cloth 35 other than the open piece 359 can be increased.

  In the illustration of FIG. 17, a planned fracture line 3524 that forms the tip of the open piece 353 is formed between the tear lines 8424 and 848. This planned fracture line 3524 extends substantially in parallel with the tear line 8424. Further, planned break lines 3523 that form both side portions of the open piece 353 extend to the lower side than the planned break line 3524. Thereby, the open piece 357 is formed adjacent to the open piece 353 in the wrapping cloth.

  On the other hand, the cover main body portion 37 is formed with a non-deployment portion 886 having the tear line 848 as a peripheral portion by the development of the development portions 864 and 865, and the open piece 357 opens to the non-deployment portion 886 side. Since the airbag 32 is in contact with the peripheral edge (the broken side surface), the airbag 32 can be prevented from coming into direct contact with the peripheral edge of the non-deployment portion 886, and the distal end portion of the open piece 353 is more than the distal end portion of the deployment portion 862. Since it is arrange | positioned outside, the attaching part 82 can also be protected.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Steering wheel 30 Airbag apparatus 32 Airbag 34 Inflator 35 Wrapping cloth 36 Cover 352 Expected breaking line 353,359 Open piece 842 Tier line 862 Deployment part 882,884 Non-deployment part

Claims (6)

An airbag device attached to a steering wheel,
A folded airbag,
An inflator for inflating and deploying the airbag;
A wrapping material for wrapping the entire folded airbag;
A cover for accommodating the airbag, the packaging material, and the inflator;
An emblem that has an attachment portion that penetrates the cover and is attached to a driver-side surface of the cover via the attachment portion;
With
The cover is formed with a tear line and a cover deployment part that is partitioned by the tear line and opens when the airbag is inflated and deployed.
The emblem is provided in the cover unfolding part,
The packaging material is formed with a planned break line that breaks when the airbag is inflated and deployed, and the packaging material is configured with at least one open piece formed by the planned break line,
The protective opening piece, which is one of the opening pieces, is disposed so as to cover the mounting portion when viewed from the back surface of the cover in a state where the airbag is not inflated and deployed. An airbag apparatus that completely covers the mounting portion and opens in a state of being overlapped with the cover deploying portion from the start of the inflating and deploying until the inflating and deploying is completed. The airbag device according to claim 1,
The airbag device, wherein both ends of the planned breaking line forming the protective opening piece are located on the opposite side of the attachment portion from the hinge portion of the cover deployment portion. The airbag device according to claim 1 or 2,
The airbag device, wherein a line connecting both ends of the planned breaking line forming the protective opening piece is disposed in parallel to the hinge portion of the cover deployment portion. The airbag device according to claim 2 or 3,
The cover is formed with a non-deployment part adjacent to the cover development part at least on the hinge part side and on both sides of the cover development part,
The airbag apparatus according to claim 1, wherein a width of the hinge portion of the cover unfolding portion is wider than a width of a portion corresponding to the hinge portion of the protective opening piece. The airbag device according to any one of claims 1 to 4,
The airbag device, wherein the planned breaking line that forms the protective opening piece is located outside the tear line that forms the cover deployment portion at a portion corresponding to the mounting portion. The airbag device according to any one of claims 1 to 5,
The cover is formed with a non-deployment part adjacent to the cover development part,
In the packaging material, a peripheral edge cover piece is formed by the planned break line adjacent to the open piece,
The peripheral edge cover piece is an airbag device that covers at least a part of the peripheral edge of the non-deployment portion when viewed from the back surface of the cover.

Images