JP2012086697A - Cover body of airbag device - Google Patents

Abstract

To provide a cover body for an airbag device capable of deploying a door portion in a desired behavior while reducing manufacturing cost and protecting an emblem.
An emblem 55 of a decorative member 24 is fixed to a first door portion 31 by a back plate 56. The protruding portion 56a of the back plate 56 contacts the rim portion 15 in a state where the first door portion 31 is expanded toward the rim portion 15 of the steering wheel 10, and prevents the emblem 55 from entering the opening B3. Even if the emblem 55 has a relatively low rigidity portion, the door portion 30 is desired while reducing the manufacturing cost and protecting the emblem 55 without increasing the rigidity of the emblem 55 using an expensive material or the like. It can be developed with the behavior of
[Selection] Figure 1

Description

  The present invention relates to, for example, a cover body of an airbag device provided in a vehicle handle.

  2. Description of the Related Art Conventionally, an airbag device provided in a fixed part of a handle of a vehicle such as an automobile has been used. The airbag device includes a bag-shaped airbag, an inflator that supplies gas to the airbag, and a cover body that covers and stores the airbag when not deployed. In this cover body, a tear line (scheduled break portion) that is easily broken is formed in a cover body that covers the airbag stored in a folded state. When the vehicle receives an impact due to, for example, a collision, the airbag is inflated by supplying gas from the inflator to the airbag, and the cover body of the cover body extends along the tear line due to the inflation of the airbag. The door part is formed by breaking, and the door part is deployed so that the airbag is deployed to the occupant side to restrain and protect the occupant.

  With respect to the cover body of such an airbag device, a configuration is known in which an emblem (ornament) as a decorative body is attached to a substantially central portion of the cover body and a tear line is arranged along the emblem. In this configuration, a fixing pin protruding from the back side of the emblem disposed on the front surface side of the cover body is inserted into the cover body, and protrudes toward the emblem side at a substantially central portion of the mounting member disposed on the back surface side of the cover body. And forming a through hole in the bulging portion, and a locking portion at the tip of the fixing pin in the concave portion on the back surface side of the bulging portion. The cover main body is sandwiched between the emblem and the attachment member. With this configuration, the emblem is securely fixed to the cover main body while the thickness of the emblem mounting portion is reduced to make the entire thickness of the cover body uniform (for example, Patent Document 1). reference).

JP 2000-255362 A (Page 3, Fig. 1-4)

  However, the emblem as described above may have a low rigidity portion having a relatively low rigidity depending on the shape. In such a case, when the door part to which the emblem is fixed is deployed, the spoke is a connecting part that connects the rim part and the fixing part between the rim part and the fixing part of the handle. It is necessary to use expensive cover bodies and emblem materials suitable for the respective characteristics so that they do not get in between and deform, making it difficult to reduce manufacturing costs.

  This invention is made in view of such a point, and it aims at providing the cover body of the airbag apparatus which can expand | deploy a door part by desired behavior, reducing manufacturing cost and protecting a decoration body.

  The cover body of the airbag device according to claim 1, wherein the cover body is attached to the fixed portion of the handle having a fixed portion where the airbag is disposed and a rim portion positioned around the fixed portion, and covers the airbag. A tear line that divides the cover main body, is cleaved when the airbag is inflated and deployed, and forms a door portion that is deployed toward the rim portion, and a decorative member that is provided on the cover main body and is located on the door portion The decorative member is provided separately from the decorative body positioned on the front surface side of the door portion and the decorative body, and is positioned on the back surface side of the door portion via the door portion. An attachment member connected to the decoration body and fixing the decoration body to the door portion, and the attachment member abuts against the rim portion in a deployed state of the door portion, and the fixing portion and the rim portion Blocking the decorative body from entering the gap Those having a that protrusion.

  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 attachment member is disposed at a position facing a portion where the door portion and the cover body are connected. It has an edge part along the connected part.

  The cover body of the airbag device according to claim 3 is the cover body of the airbag device according to claim 1 or 2, wherein the decorative body includes a plurality of cut portions forming a low-rigidity portion having relatively low rigidity. It is what it has.

  According to the cover body of the airbag device of the first aspect, the protruding portion of the mounting member that fixes the decorative body to the door portion contacts the rim portion of the handle in a state where the door portion is deployed toward the rim portion of the handle. Even if it is a decorative body having a relatively low rigidity part by preventing the decorative body from entering the clearance between the fixed part of the handle and the rim part, the decoration is made using an expensive material. Without improving the rigidity of the body, the door can be deployed in a desired behavior while reducing the manufacturing cost and protecting the decorative body.

  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, it opposes the portion where the door portion of the attachment member and the cover body are connected. By having the edge part along the connecting part at the position, when the door part is deployed with the part where the door part and the cover main body are connected as a hinge part, this development is not hindered by the rigidity of the mounting member. , Can ensure the smooth deployment of the door.

  According to the cover body of the airbag device according to claim 3, in addition to the effect of the cover body of the airbag device according to claim 1 or 2, the decorative body has a low rigidity portion formed by a plurality of cut portions. Even if it is a thing, the deformation | transformation of the decoration body at the time of expansion | deployment of a door part can be prevented effectively, reducing manufacturing cost.

It is a perspective view which shows a part of deployment state of the airbag of one Embodiment of the cover body of the airbag apparatus of this invention. It is sectional drawing which shows a part of deployment state of an airbag same as the above. (a) is a front view showing a decorative body of a decorative member of a cover body of the airbag device same as above, and (b) is a rear view showing the decorative body. (a) is the front view which shows the attachment member of the decoration member of the cover body of an airbag apparatus same as the above, (b) is a rear view which shows an attachment member. It is a front view which shows the cover body of an airbag apparatus same as the above. It is a front view of a handle provided with an airbag device same as the above.

  The configuration of an embodiment of the present invention will be described below with reference to the drawings.

  In FIG. 6, reference numeral 10 denotes a steering wheel as a handle of an automobile that is a vehicle. The steering wheel 10 includes a steering wheel body 12 that is a handle body, and an airbag device 14 that is mounted on the passenger side of the steering wheel body 12. It has. The steering wheel 10 is normally mounted on a steering shaft provided in the vehicle in an inclined state.Hereinafter, based on the straight traveling state of the vehicle, the steering shaft side is the back side, and the occupant side is the front side. A direction toward the windshield (arrow A direction) will be described as an upper side.

  The steering wheel main body 12 includes an annular curved gripping portion, that is, a rim portion 15 that is a grip portion, and a hub portion 16 that is a main body portion (boss portion) as a fixing portion located inside the rim portion 15. And a plurality of, for example, three spoke portions 17 as connecting portions for connecting the rim portion 15 and the hub portion 16. Here, in order to ensure good visibility with respect to the meters provided on the instrument panel, the spoke portions 17 are arranged on both sides and the lower side of the hub portion 16 in a straight traveling state of the automobile. Accordingly, openings B1, B2, and B3, which are gaps or spaces, are formed between the rim portion 15 and the hub portion 16 and between the spoke portions 17, respectively.

  Here, the opening B1 located on the upper side is formed larger than the openings B2 and B3 located on both the left and right sides of the lower side, and the openings B2 and B3 are formed to have substantially the same size.

  The hub portion 16 is fitted and fixed to the steering shaft via a cylindrical boss (not shown) formed on the back surface portion. The hub portion 16 and the spoke portion 17 are integrally formed by integrally forming a core metal and welding the core metal of the rim portion 15 to the core metal of the spoke portion 17. The cores of the hub part 16, the spoke part 17 and the rim part 15 are covered with a soft skin part. Further, garnishes 18 each having a switch and the like are attached to the spoke portions 17 on both sides.

  The airbag device 14 is also called an airbag module, and is arranged so as to cover the front side of the hub portion 16 of the steering wheel body 12. The airbag device 14 includes a base plate (not shown) as a mounted member made of a metal plate or the like, a bag-like airbag, an inflator for injecting gas, and the like, although not shown, and is made of a resin as shown in FIG. A cover body 20 is provided. The base plate is attached to the steering wheel main body 12 via a horn plate or a bracket portion, and the airbag, the inflator, and the cover body 20 are attached to the base plate. Covered.

  The cover body 20 is also referred to as a case body, a pad, or a module cover, and a front plate portion 21 that covers a part of the hub portion 16 and the spoke portion 17 and a front view from the back of the front plate portion 21 are omitted. A peripheral plate portion 22 which is a peripheral wall projecting in a cylindrical shape such as a rectangular tube shape is integrally formed of synthetic resin or the like. Furthermore, the portion surrounded by the front plate portion 21 and the peripheral plate portion 22 of the cover body 20 becomes an airbag storage portion for storing the folded airbag, and the portion facing the front side of the airbag storage portion is the cover body. And a decorative member 24 is provided at the central portion of the front plate portion 23. The front plate portion 21 can take various configurations in design, but in this embodiment, the front plate portion 21 substantially follows the shape of the hub portion 16 and the peripheral plate portion 22 in front view. It is formed slightly larger than. Further, in the present embodiment, the airbag device 14 also serves as a horn switch operation unit, is elastically supported by a horn plate, and the front plate portion 23 functions as a horn pad.

  Further, the front plate portion 23 faces the airbag storage portion, and a tear line 28 is formed. By tearing the tear line 28, a plurality of door portions 30 are formed when the airbag is deployed. And the door part 30 is provided with four asymmetrical first to fourth door parts 31, 32, 33, 34, and the first door part 31 on which the decorative member 24 is arranged is the other three parts. It is larger than the door portions 32, 33, and 34 of the sheet and is disposed below one side (the right side in FIGS. 5 and 6).

  Further, the tear line 28 forming the door portion 30 can be called a planned line portion or a planned fracture portion, and the back side of the front plate portion 23 is recessed in a groove shape, It is formed as a weak part weaker than the part. More specifically, the tear line 28 is formed on both sides of the outer peripheral tear line portions 41 and 41 formed on both sides along the outer peripheral portion of the front plate portion 23, and on the lower side portion along the outer peripheral portion of the front plate portion 23. The lower outer peripheral tear line portion 42 formed, the semicircular arc-shaped detour tear line portion 44 formed along the other side of the decorative member 24 (the left side in FIGS. 5 and 6), and the upper side of the detour tear line portion 44 Directly connected tear line portion 45 extending from the end portion to one outer peripheral tear line portion 41, and bent from the lower end portion of detour tear line portion 44 and extending linearly to lower outer peripheral tear line portion 42 A first connecting tear line portion 46, a second connecting tear line portion 47 extending in a straight line from the other side portion that is an intermediate position of the bypass tear line portion 44 to the outer peripheral tear line portion 41, and a bypass tear line portion 44 A straight line from the upper side, which is the middle position, to the upper end of the outer periphery of the front plate part 23 And a third connecting tear line portion 48 extending in a shape.

  The bypass tear line portion 44 is formed in an arc shape slightly longer than a semicircle, and the direct connection tear line portion 45 is formed to be inclined downward on one side.

  Further, a portion between the outer peripheral tear line portions 41, 41, 42 adjacent to each other serves as a hinge portion 51 as a connecting portion serving as a rotation shaft when the door portion 30 is deployed on the front side. That is, the portion of the outer peripheral portion of the front plate portion 23 where the tear line 28 is not formed becomes a portion that connects the deployed door portion 30 to the outer peripheral portion of the peripheral plate portion 22 and the front plate portion 21 that are non-expanded portions. ing. The hinge portion 51 can be formed to have a smaller thickness dimension than other portions so that it can be easily bent, but in the present embodiment, it is formed to have the same thickness size as the other portions.

  Also, the lower end portions 41a of the outer peripheral tear line portions 41, 41 on both sides and the end portions 42a on both sides of the lower outer peripheral tear line portion 42 are folded back to the inner peripheral side in order to suppress the progress of the cleavage. It is curved. Further, the upper end portion 41b of the outer peripheral tear line portions 41, 41 on both sides and the upper end portion 48a of the third connection tear line portion 48 are formed so as to abut against the peripheral plate portion 22 of the cover body 20, As necessary, weak portions are continuously formed in the peripheral plate portion 22 as well.

  The decorative member 24 includes, for example, an emblem 55 (FIG. 3) that is an upper plate as a decorative body, and a back plate 56 (FIG. 4) that is a lower plate as a mounting member that fits and holds the emblem 55. As shown in FIGS. 1 and 2, the front plate portion 23 of the cover body 20 is sandwiched and fixed on the back side of each of the emblem 55 and the back plate 56.

  The emblem 55 shown in FIG. 3 (a) and FIG. 3 (b) is also called an ornament. For example, the emblem 55 is integrally formed of a hard resin such as so-called polycarbonate ABS containing polycarbonate in the ABS resin, and is appropriately coated or plated. Surface treatment is applied. That is, the emblem 55 is formed of a member that is harder than the cover body 20. Further, in the present embodiment, the emblem 55 is formed, for example, in a hexagonal shape as a whole as viewed from the front, and has a long and narrow notch so as to intersect the two sides 55a and 55a facing each other. By forming the lines 55b and 55b in a straight line, for example, the three strips 55c, 55c and 55c have a Z-shaped (inverted S-shaped) design that is continuous in a zigzag shape. In other words, these strip portions 55c, 55c, 55c are formed in the shape of an elongated band, so that they become a low rigidity portion (weak portion) having relatively low rigidity (strength) compared to the other portion of the emblem 55. ing.

  Further, on the back surface (back surface) of the emblem 55, leg portions 55d, which are fixing pins as columnar protrusions, are integrally formed so as to protrude from a substantially central portion of each strip portion 55c. Therefore, these leg portions 55d are arranged in a straight line as a whole. Furthermore, a locking portion 55e, which is a locking protrusion having a stepped diameter with respect to the base end side, is integrally formed at the distal ends of these leg portions 55d. And when these leg parts 55d attach the emblem 55 to the front board part 23 (FIG. 1), they are attached to the attachment hole which is penetrated from the surface side of this front board part 23 (FIG. 1) to the back side. Each inserted. These mounting holes are formed along a straight line inclined with respect to the vertical direction shown in FIG.

  Further, the back plate 56 shown in FIGS. 4A and 4B is integrally formed of a hard resin such as so-called polycarbonate ABS, for example, similarly to the emblem 55. For example, the back plate 56 is formed to be thicker than the emblem 55. Has been. That is, the back plate 56 is formed as a member harder than the cover body 20. Further, the back plate 56 has a protruding portion 56a as a contact portion that protrudes (extends) on one side, and has a flat portion 56b as a linear edge on the other side, in a substantially convex shape. Is formed. Further, for example, three locking hole portions 56c into which the leg portions 55d of the emblem 55 are respectively inserted and locked are formed in a substantially central portion of the back plate 56. Further, on the back surface (back surface) of the back plate 56, there are an outer peripheral rib portion 56d that is a reinforcing rib portion surrounding the periphery in a frame shape, and a reinforcing rib portion positioned inside the outer peripheral rib portion 56d. A plurality of linear rib portions 56e are formed. That is, the back plate 56 is thicker than the other portions at the positions of the outer peripheral rib portion 56d and the straight rib portion 56e. The back plate 56 has an area larger than that of the emblem 55 as a whole, and its outer outline (maximum outline) substantially encompasses the outer outline (maximum outline) of the emblem 55. In other words, the back plate The entire outer shell (maximum outer shape) of 56 is formed to be larger than the outer shell (maximum outer shape) of the emblem 55. However, part of the edge portion of the emblem 55 may protrude from the outside of the back plate 56 in front view. Further, the outer dimension (maximum outer shape) of the back plate 56 can be such that the dimension L1 from the flat part 56b to the projecting part 56a is equal to or larger than the short dimension L2 of the opening B3. The size is such that it cannot pass through the opening B3 in the state of facing directly to. In some cases, the outline (maximum outline) of the back plate 56 can be made equal to or slightly smaller than the short dimension L2 of the opening B3.

  The protruding portion 56a is formed, for example, so that the width dimension gradually decreases from the base end side to the tip end side, and is formed in a trapezoidal shape in plan view.

  The flat portion 56b is formed along a direction intersecting (orthogonal) with the protruding direction of the protruding portion 56a. The flat portion 56b is opposed to the hinge portion 51 of the first door portion 31 when the emblem 55 is attached so as to be in a normal direction (as shown in FIG. 5 and the like). Positioned so that it is approximately parallel to 51. That is, the flat portion 56 b has a shape along the hinge portion 51 of the first door portion 31.

  Further, the locking hole portion 56c is formed in a circular shape, and is formed in a straight line substantially parallel to the flat portion 56b. Further, a plurality of, in the present embodiment, three locking pieces 56f are formed on the inner edge portion of the locking hole portions 56c so as to protrude toward the center side, in which the locking portions 55e of the emblem 55 are locked. . These locking pieces 56f are formed in a fan shape and are arranged at substantially equal intervals in the circumferential direction. Further, these locking pieces 56f are formed in a free end shape on the tip side, and can be elastically deformed. Further, a round hole-like engagement hole 56g is formed between the tips of the locking pieces 56f, 56f, 56f. As shown in FIG. 2, the engagement hole 56g is a hole portion into which the locking portion 55e of the emblem 55 inserted into the locking hole portion 56c is inserted and locked.

  Further, as shown in FIG. 4 (b), the outer peripheral rib portion 56d continues in an annular shape across the protruding portion 56a and the flat portion 56b.

  Each linear rib portion 56e is formed along a direction intersecting (orthogonal) with respect to the flat portion 56b, and both end portions are continuous with the outer peripheral rib portion 56d. That is, these linear rib portions 56e are formed so as to connect one side and the other side of the outer peripheral rib portion 56d facing each other. These linear rib portions 56e are substantially parallel to the strip portion 55c in a state where the emblem 55 and the back plate 56 are fixed to each other.

  As shown in FIG. 5, the back plate 56 is used as one and the other positioning portions formed in a portion corresponding to the first door portion 31 on the back surface (back surface) side of the front plate portion 23 of the cover body 20. It is comprised so that it may arrange | position between the one and other positioning rib parts 58 and 59 of these.

  One positioning rib portion 58 determines the position of the back plate 56 on the protruding portion 56a side, and is formed along the curved shape of the bypass tear line portion 44 (along the upper left position in FIG. 5).

  The other positioning rib portion 59 determines the position of the back plate 56 on the flat portion 56b side, and is formed at a position facing the one positioning rib portion 58.

  Next, the attaching operation of the decorative member 24 according to the one embodiment will be described.

  When attaching the decorative member 24, first, each leg portion 55d of the emblem 55 is inserted into the attachment hole from the surface of the front plate portion 23 of the cover body 20.

  Next, each leg portion of the emblem 55 inserted into the mounting hole of the front plate portion 23 of the cover body 20 by fitting the back plate 56 between the positioning rib portions 58 and 59 on the back side of the cover body 20. 55d and each locking hole portion 56c of the back plate 56 are aligned, and each leg portion 55d is inserted into each locking hole portion 56c.

  Each leg 55d inserted into each locking hole 56c has a locking portion 55e formed in a large diameter at the tip thereof to elastically lock the locking pieces 56f, 56f, 56f of each locking hole 56c. When the engagement pieces 56f, 56f, and 56f are deformed and passed through the engagement holes 56g that are enlarged by the deformation, the engagement pieces 56f, 56f, and 56f are restored and deformed to reduce the engagement holes 56g, and the engagement portions 55e. The locking pieces 56f, 56f, 56f are positioned around the base end side of each leg 55d having a smaller diameter (FIG. 2). As a result, the engaging portions 55e of the leg portions 55d of the emblem 55 are engaged with the engaging holes 56g of the back plate 56, whereby the emblem 55 is attached to the back plate 56 and the front plate portion 23 of the cover body 20 is attached. The emblem 55 is fixedly held at a predetermined position of the front plate portion 23 of the cover body 20 in the orientation shown in FIG. That is, the emblem 55 and the back plate 56 can be formed in a short time by simply inserting the leg portions 55d (locking portions 55e) of the emblem 55 into the locking hole portions 56c (engaging holes 56g) of the back plate 56. Easy installation and good workability.

  Next, the operation of the above embodiment will be described.

  When an automobile equipped with the steering wheel 10 collides with the airbag apparatus 14 including the cover body 20 to which the decorative member 24 shown in FIG. 6 is fixed, the control apparatus operates the inflator to supply gas to the airbag. Then, the airbag rapidly inflates and deploys, and the cover body 20 is broken along the tear line 28 by the inflating and deploying pressure, and the door portion 30, four first to fourth door portions 31 in the present embodiment. , 32, 33, 34 are formed. Furthermore, each door part 31, 32, 33, 34 forms a projecting opening which is an opening for rotating the hinge part 51 as an axis to inflate the air bag, and the air bag is forward of the occupant from this projecting opening. Deploy and protect occupants.

  When the door portions 31, 32, 33, 34 are deployed, the first door portion 31 to which the decorative member 24 is attached becomes the second to fourth door portions 32, 33, 34 to which the decorative member 24 is not attached. On the other hand, there is a weight and the start of the deployment behavior tends to be delayed, and once the deployment starts, there is a tendency to move in the same direction with a large inertia.

  In this respect, in the present embodiment, the first door portion 31 to which the decorative member 24 is attached has a different shape from the second to fourth door portions 32, 33, and 34 to which the decorative member 24 is not attached. Since the area is larger than those of the second to fourth door portions 32, 33, 34, the first door portion 31 receives a greater force for the airbag to develop than the other door portions 32, 33, 34, It develops in a well-balanced manner like the other door portions 32, 33, and 34 without being delayed from the other door portions 32, 33, and 34.

  Then, the door portion 30 is directed toward the rim portion 15, the first door portion 31 expands into the opening B3, the second door portion 32 expands into the opening B2, and the third and fourth door portions. 33 and 34 expand to opening B1. That is, the door part 30 expands to a position where the spoke part 17 is removed.

  As shown in FIGS. 1 and 2, when the first door portion 31 is unfolded, the protruding portion 56a of the portion of the decorative member 24 to which the first door portion 31 is attached is applied. A portion corresponding to the above-mentioned portion contacts the rim portion 15 of the steering wheel 10 via the cover body 20 or via the cover body 20 and the emblem 55.

  Accordingly, since the first door portion 31 is reinforced by the back plate 56, the first door portion 31 is not elastically deformed into a curved shape due to an impact when contacting the rim portion 15. That is, the first difference is caused by the deformation difference between the first door portion 31 of the cover body 20 formed of a relatively soft member (soft resin) and the emblem 55 formed of a relatively hard member (hard). The emblem 55 does not rise from the door 31 of the door. In addition, when the back plate 56 is in contact with the rim portion 15, the emblem 55 is not formed in the opening B3 because the first door portion 31 is not elastically deformed. It is prevented from entering and passing through this opening B3, and the edge part of the protruding emblem 55 is caught in the step or gap of the steering wheel 10, or any one of the small pieces 55c is locally attached to the rigid part such as the rim part 15. The emblem 55 does not deform due to external force applied (imaginary line I in FIG. 2).

  Note that, as described above, when the outline (maximum outer shape) of the back plate 56 is made equal to or slightly smaller than the short dimension L2 of the opening B3, the first door portion 31 becomes the rim of the steering wheel 10. Although the back plate 56 does not come into contact with the rim portion 15 when coming into contact with the portion 15, the protruding portion 56 a of the back plate 56 is arranged in the vicinity of the position where the first door portion 31 comes into contact with the rim portion 15. As a result, the rigidity of the position where the first door portion 31 contacts the rim portion 15 is reinforced, and the first door portion 31 is elastically curved by an impact when the first door portion 31 contacts the rim portion 15. There is no deformation. Therefore, even if the outer shape (maximum outer shape) of the back plate 56 is equal to or slightly smaller than the short dimension L2 of the opening B3, the first door portion 31 does not elastically deform, so that the emblem 56 becomes the opening B3. It is prevented from entering and passing through the opening B3.

  From the above, the fact that the outline (maximum outer shape) of the back plate 56 is slightly smaller than the short dimension L2 of the opening B3 means that the emblem 56 is opened to the opening B3 when the first door portion 31 comes into contact with the rim portion 15. The size may be such that it does not penetrate through this opening B3.

  As described above, the protrusion 56 a of the back plate 56 that fixes the emblem 55 to the first door portion 31 is formed on the rim portion 15 in a state where the first door portion 31 is deployed toward the rim portion 15 of the steering wheel 10. The emblem 55 having a relatively low rigidity (strength) portion by abutting and preventing the emblem 55 from entering the opening B3 between the hub portion 16 and the rim portion 15 of the steering wheel 10. However, without increasing the rigidity (strength) of the emblem 55 using an expensive material or the like, the door 30 can be deployed in a desired behavior while reducing the manufacturing cost and protecting the emblem 55.

  Specifically, even if the emblem 55 has the strip portions 55c, 55c, 55c which are low rigidity portions formed by the plurality of cut portions 55b, 55b, the manufacturing cost of the door portion 30 can be reduced. Deformation of the emblem 55 during deployment can be effectively prevented.

  In addition, the emblem 55 is fitted and held on the back plate 56 using the leg portions 55d aligned in a straight line, and the back plate 56 has a locking hole portion 56c for inserting the leg portion 55d in a straight line. The portions where the locking hole portions 56 c are arranged are weak portions of the back plate 56. Therefore, by reinforcing the back plate 56 by forming the rib portions 56d, 56e, etc. on the back plate 56, the rigidity (strength) of the back plate 56 is ensured even when the locking holes 56c are arranged in a straight line. it can. Therefore, even when the protruding portion 56a contacts the rim portion 15 via the cover body 20 when the door portion 30 (first door portion 31) is deployed, the back plate 56 is not excessively deformed, and the emblem 55 The door part 30 (first door part 31) can be deployed in a desired behavior while protecting the above with more certainty.

  Moreover, the emblem 55 and the back plate 56 can be easily formed in a short time by simply inserting the leg portions 55d (locking portions 55e) of the emblem 55 into the locking hole portions 56c (engaging holes 56g) of the back plate 56. Therefore, the mold for molding the emblem 55 and the back plate 56 can be a simple structure. Therefore, the emblem 55 and the back plate 56 can be easily manufactured, and the manufacturing cost can be further suppressed.

  Further, the position on the hinge part 51 side where the first door part 31 and the front plate part 23 of the back plate 56 are connected is a flat part 56b along the hinge part 51, whereby the first door When the part 31 is developed around the hinge part 51, this development is not hindered by the rigidity (strength) of the back plate 56, and the smooth development of the door part 30 (first door part 31) can be ensured. That is, the door 30 (first door 31) is smoothly deformed by the hinge 51 when deployed to cause the door 30 (first door 31) to be deployed in a desired behavior. Energy at the time of deployment of 30 (first door portion 31) can be effectively absorbed.

  In the above-described embodiment, the emblem 55 and the back plate 56 may be formed of the same material such as synthetic resin and fixed by welding, or the emblem 55 and the back plate 56 can be welded. It may be formed and welded and fixed depending on the material, or may be fixed by caulking. That is, the fixing structure of the emblem 55 and the back plate 56 is not limited to the above configuration.

  Further, the back plate 56 may be formed of a material such as metal.

  Further, the emblem 55 can have various shapes in addition to the shape of the above-described embodiment.

  Further, the door portion 30 may not be plural as long as it includes at least the decorative member 24.

  In the above embodiment, the steering wheel 10 including the three spoke portions 17 has been described. However, the present invention is not limited to this configuration, and the configuration including one or two spoke portions 17 or four It can also be applied to the airbag device 14 provided in the handle provided with the spoke portion 17.

  The present invention can be applied to, for example, an airbag device used for a steering wheel of an automobile, as well as an airbag device provided for various parts of a steering wheel of a vehicle.

10 Steering wheel as a steering wheel
14 Airbag device
15 Rim part
16 Hub as fixed part
20 Cover body
23 Front plate as cover body
24 Decorative materials
28 Tearline
30 Door
55 Emblem as decoration
55b notch
55c Strip part which is low rigidity part
56 Back plate as mounting member
56a Protrusion
56b Flat part as edge

Claims (3)

A cover body attached to the fixed portion of the handle having a fixed portion where the airbag is disposed and a rim portion positioned around the fixed portion, and covering the airbag;
A tear line that divides the cover body and that is cleaved when the airbag is inflated and deployed to deploy toward the rim part, and a tear line,
A decorative member provided on the cover body located at the door portion;
The decorative member is
A decorative body located on the surface side of the door portion;
It is provided separately from the decorative body, is located on the back side of the door portion, and includes an attachment member that is connected to the decorative body via the door portion and fixes the decorative body to the door portion,
The mounting member has a protruding portion that abuts the rim portion in a deployed state of the door portion and prevents the decorative body from entering a gap between the fixed portion and the rim portion. A cover body for the airbag device. 2. The airbag device according to claim 1, wherein the attachment member has an edge portion along a connecting portion at a position facing the connecting portion of the door portion and the cover main body. Cover body. The cover body of an airbag device according to claim 1 or 2, wherein the decorative body includes a plurality of cut portions that form a low-rigidity portion having relatively low rigidity.

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