JP2008030718A - Cover body of air bag device, air bag device, and steering wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve inflating characteristics of an air bag provided in a steering wheel, and to reduce the manufacturing cost thereof. <P>SOLUTION: In the air bag device 4 provided in a boss part 6 of the steering wheel 1, a tear line 36 is formed from a front plate part 31 to a peripheral plate part 32 of a cover body 23. The tear line 36 is formed into a slit in the peripheral plate part 32. When the tear line 35 is torn with inflation of the air bag 22, a tip part of an upper door part 35a abuts on a rim part 5 to cover a space for visibly confirming meters, and guides the air bag 22 so as to be smoothly inflated upward. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cover body of an airbag device, an airbag device, and a steering wheel provided with the airbag device, for example, provided in a boss portion of a steering wheel body of a vehicle.

  Conventionally, an airbag device provided in a boss portion of a steering wheel body has been used. The airbag apparatus includes a bag-shaped airbag, an inflator that supplies gas to the airbag, a cover body that covers and stores the airbag when not deployed, and a base plate to which these members are attached. . And a cover body is provided with the cylindrical attachment board part attached to a baseplate, and the coating | coated part which covers the front side of this attachment board part, The tear line which breaks easily is formed in the coating | coated part. Then, when a gas is supplied from the inflator to the airbag at the time of a car collision, the cover portion of the cover body is broken along the tear line to form a door portion. In other words, the occupant is inflated and deployed to restrain and protect the occupant (see, for example, Patent Document 1). That is, in this configuration, the airbag tends to expand to the front side as guided by the cover body, and it is necessary to provide a hanging string or the like inside the airbag in order to suppress the force toward the front side. There is a problem that the structure of the airbag becomes complicated and the manufacturing cost increases.

For example, a configuration is known in which first to third tether belts that are sequentially released from being restrained are arranged inside an airbag to reduce the impact on an occupant (see, for example, Patent Document 2). However, this structure has a problem that the structure of the airbag becomes complicated, the airbag folding operation becomes complicated, and the manufacturing cost increases.
Japanese Patent Laying-Open No. 2002-193059 (FIG. 3) Japanese Patent Laying-Open No. 2005-297715 (first page, FIG. 2)

  There is a demand for a configuration capable of realizing desired development characteristics without increasing the manufacturing cost as in the conventional case.

  The present invention has been made in view of these points, and an object of the present invention is to provide an airbag device cover body, an airbag device, and a steering wheel that can realize desired deployment characteristics while suppressing manufacturing costs. .

  The cover body of the airbag device according to claim 1 is a cover body of an airbag device that covers an airbag that is supplied with gas and that is inflated and deployed when the airbag is not deployed, and that accommodates the airbag when the airbag is not deployed. And a front plate portion covering the front side of the airbag storage portion, a peripheral plate portion connected to the front plate portion and covering an outer peripheral side of the airbag storage portion, and formed from the front plate portion to the peripheral plate portion. The front plate portion is more fragile and easily broken than other portions, and the peripheral plate portion has a slit-like tear line and a portion surrounded by the tear line when the tear line is opened. And a guide surface portion that is provided on a surface of the door portion that faces the airbag storage portion and that guides the airbag that is deployed on the outer peripheral side.

  In this configuration, when gas is supplied to the airbag, the tear line is cleaved by the inflation pressure of the airbag, and the airbag is inflated and deployed by opening the door portion from the airbag storage portion. Since the tear line has a slit shape in the peripheral plate portion, when the front plate portion is broken, it is continuously cleaved to the outer peripheral side, and the door portion is smoothly and widely expanded on the outer peripheral side, The deployed guide surface portion of the door portion guides the airbag, and a preferable deployment characteristic that the airbag expands widely and flatly to the outer peripheral side is easily realized.

  The cover body of the airbag device according to claim 2 is the cover body of the airbag device according to claim 1, wherein at least a part of the front plate portion and the peripheral plate portion is a curved plate at a position constituting the door portion. It is a shape.

  And in this structure, at the time of expansion | deployment of a door part, the part which makes the curved plate shape becomes resistance of a deformation | transformation, and it is suppressed that the momentum of expansion | deployment of a door part becomes large too much.

  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 tear line includes a dividing portion that deploys the distal end portion of the door portion in a direction crossing the deployment direction. It is a thing.

  And in this structure, when a division | segmentation part cleaves, the front-end | tip part of a door part is expand | deployed in the direction which cross | intersects a deployment direction, and an airbag is guided in a wide area.

  The airbag apparatus according to claim 4 is an airbag that is inflated and deployed when supplied with gas, and a cover body according to any one of claims 1 to 3 that accommodates the airbag in an airbag accommodating portion when not deployed. An inflator for supplying gas to the airbag, and an attached member to which the airbag, the cover body, and the inflator are attached.

  Further, in this configuration, since the cover body according to any one of claims 1 to 3 is provided, the structure of the airbag can be simplified, and the airbag is widely flattened toward the outer peripheral side while reducing the manufacturing cost. The preferred deployment characteristics for deployment are easily realized.

  The steering wheel according to claim 5 includes a rim portion, a steering wheel main body including a boss portion positioned inside the rim portion, and a spoke portion connecting the rim portion and the boss portion, and the boss portion. The door part formed at the time of expansion | deployment of the airbag of this airbag apparatus covers the space between the said rim | limb part and the said boss | hub part. Is.

  In this configuration, since the airbag device according to the fourth aspect is provided, a preferable deployment characteristic that the airbag expands widely and flatly on the outer peripheral side can be easily realized while reducing the manufacturing cost. Further, the door covers the space between the rim portion and the boss portion, and the airbag is guided to the outer peripheral side by the guide surface portion of the door portion, so that the airbag is placed in the space between the rim portion and the boss portion. Entering more than necessary is suppressed.

  According to a sixth aspect of the present invention, in the steering wheel according to the fifth aspect, the door portion formed when the airbag of the airbag device is deployed is deployed on the outer peripheral side and comes into contact with the rim portion.

  And in this structure, when the developed door part contacts the rim part, the space between the rim part and the boss part is surely covered by the door part, and the airbag is located between the rim part and the boss part. Entering the space more than necessary is suppressed.

  According to the present invention, it is possible to easily realize preferable deployment characteristics in which the airbag is widely deployed flat on the outer peripheral side while reducing the manufacturing cost.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of a cover body, an airbag device, and a steering wheel of an airbag device according to the invention will be described with reference to the drawings.

  1 and 2, reference numeral 1 denotes a steering wheel of an automobile, which is a vehicle. The steering wheel 1 includes a steering wheel main body 2 and an airbag device 4 mounted on the passenger side of the steering wheel main body 2. Yes. The steering wheel 1 is normally mounted on a steering shaft provided in the vehicle in an inclined state. Hereinafter, directions such as the vertical direction will be described with reference to the straight traveling state of the vehicle. Moreover, in FIG. 1, A has shown with the dummy which imitated the passenger | crew, and C has shown the position of the jaw part. Z is the front direction along the axial direction of the steering shaft, Y is the outer peripheral direction orthogonal to the front direction, that is, the direction toward the upper side of the outer peripheral side, and the following is simply described as being upward.

  The steering wheel body 2 connects the rim portion (ring portion) 5 which is an annular gripping portion, the boss portion 6 located inside the rim portion 5, and the rim portion 5 and the boss portion 6. The plurality of spoke portions 7 in the present embodiment are configured. Here, in order to ensure good visibility with respect to the meters provided on the instrument panel, the three spoke portions 7 are arranged so as to be positioned on both sides and the lower side of the boss portion 6 in a straight traveling state. On the upper side of the boss 6, a meter viewing space B that is a relatively large opening is provided. The steering wheel 1 is a so-called sports type and is a small-diameter handle in which the diameter of the rim portion 5 is relatively small.

  In addition, a substantially cylindrical boss that is fitted to the steering shaft is provided at a lower portion of the boss portion 6 on the vehicle body side, and a boss plate that forms a core body called a hub core is a magnesium alloy. Etc. are fixed integrally by die casting. Then, the cored bar 7a of the spoke portion 7 is integrally extended from this boss plate, or is fixed by welding or the like. Further, the core metal 5a of the rim part 5 is fixed to the core metal 7a of the spoke part 7 by welding or the like. Further, a skin portion 10 made of a soft foamed polyurethane or the like is formed on the outer peripheral portion of the core metal 5a of the rim portion 5 and the outer peripheral portion of the spoke portion 7 on the rim portion 5 side of the core metal 7a. Further, all or part of the outer periphery of the skin portion 10 is covered with natural or artificial leather. Further, a decorative finisher is attached to the surface side of each spoke portion 7 as necessary. Moreover, the inner peripheral part of the part which covers the spoke part 7 of the skin part 10 is formed in the planar circle shape centering on one predetermined point as a whole. Further, a resin body cover 11, also called a back cover, is attached to the boss portion 6 to cover the lower side portion of the boss portion 6. The body cover 11 is provided with a central opening 11a penetrating vertically, and a cable for electrically connecting the vehicle body side and the steering wheel 1 side through which the steering shaft is inserted. An electrical connection device such as a reel device is arranged.

  On the other hand, the airbag device 4 is also called an airbag module, and is supported by the steering wheel body 2 via a horn plate or a bracket portion (not shown). As shown in FIGS. A base plate 21, a bag-like airbag 22, a resin cover body 23, a gas inflator 25, a retainer 26, an emblem 28, and the like are provided.

  As shown in FIG. 4, the base plate 21 includes a substantially disc-shaped substrate portion 21a and a substantially cylindrical side plate portion 21b bent upward from the peripheral portion of the substrate portion 21a. It is formed by punching and bending. A circular inflator mounting hole 21c is formed at the center of the substrate 21a, and bolt through holes 21d are formed at four locations on the outer periphery of the inflator mounting hole 21c. In addition, the side plate portion 21b is formed with a plurality of engaging protrusions 21e protruding to the outer peripheral side and engaging hole portions 21f opened in a rectangular shape as engaging portions. Further, the base plate 21 is formed with a pair of bracket piece portions 21g on both sides projecting downward from both sides of the substrate portion 21a.

  Further, the airbag 22 is formed into a flat bag shape by stitching the outer peripheral portions of, for example, two circular base fabrics. As shown in FIGS. 1 and 6, the gas inlet 22a and the gas inlet Bolt through holes are formed at four locations located on the outer peripheral portion of 22a, and circular gas exhaust ports 22c are formed at two locations on the outer peripheral portion.

  The cover body 23 is called a case body, a pad, or a module cover. As shown in FIGS. 1 to 6, the cover body 23 covers the boss portion 6 and a part of the spoke portion 7 in a normal manner. A face plate portion 31 and a peripheral plate portion 32, which is a peripheral wall projecting in a cylindrical shape in a front view from the back surface of the front plate portion 31, are integrally formed of synthetic resin or the like. The front plate portion 31 can take various configurations in terms of design, but in this embodiment, the front plate portion 31 covers the boss portion 6 and is a substantially disk having a larger diameter than the peripheral plate portion 32. The boss portion covering portion 31a has a shape and a spoke portion covering portion 31b that protrudes from the lower side of the boss portion covering portion 31a and covers the lower spoke portion 7. Further, the outer peripheral portion of the boss portion covering portion 31a located on the outer peripheral side from the peripheral plate portion 32 and the edge portion 31c of the front plate portion 31 that is both sides of the spoke portion covering portion 31b continuous to the outer peripheral portion are arranged on the back side. The shape is steeply inclined. Further, an emblem 28 is attached to the center portion of the front plate portion 31. A portion surrounded by the front plate portion 31 and the peripheral plate portion 32 is an airbag storage portion 33. A tear line 36 that is a planned line portion that forms the door portion 35 when the airbag 22 is deployed is formed from the front plate portion 31 to the upper peripheral plate portion 32 facing the airbag storage portion 33.

  The tear line 36 is formed as a weak portion with the back surface recessed in a groove shape at the front plate portion 31, and as shown in FIG. 2, a center tear 36a extending in both directions and the center tear 36a A pair of side tears 36b, 36b connected to both ends and extending in an arc shape up and down along the inside of the peripheral plate portion 32, from the middle portion on both sides of the center tear 36a to the upper side, that is, along the deployment direction of the door portion 35 And an intertea 36c as an extending divided portion. In addition, the center tear 36a is curved upward so as to bypass the emblem 28 at the center in both side directions. Furthermore, an end portion breakage suppressing portion 36d is formed at the lower end portion of each side tear 36b, 36b so as to be folded back toward the inner peripheral side.

  On the other hand, as shown in FIGS. 1 and 3, the tear line 36 is formed as slit-shaped bottom tears 36e, 36e cut in advance by a length L as shown in FIGS. 1 and 3, and these bottom tears 36e, 36e, 36e extends to the back side continuously to the upper end portion of the boss portion covering portion 31a of each side tear 36b, 36b of the front plate portion 31. The tear line 36 defines a door part 35 that is divided into two upper and lower parts, that is, an upper door part 35a and a lower door part 35b. Further, the upper door portion 35a is configured such that the tip side is divided into both sides by a center tear 36a. And the front-end | tip part of these divided | segmented upper door parts 35a is the contact part 37, respectively. In addition, a virtual line connecting the back end portions of the bottom tears 36e and 36e and a virtual line connecting the lower end portions of the side tears 36b and 36b are the hinge portions 38, respectively. The surface of the upper door portion 35a toward the airbag storage portion 33, that is, the back surface is a guide surface portion 39 that smoothly guides the airbag 22 during deployment. Further, a thin portion 36f that is easily deformed with a smaller thickness than the other portions is formed at the corner portion from the boss portion covering portion 31a to the peripheral plate portion 32 of the front plate portion 31.

  In addition, the peripheral plate portion 32 of the cover body 23 has a square hole-like engagement hole 32a as an engagement receiving portion that engages with the engagement portion, and an engagement step projecting from the inner side of the peripheral plate portion 32. A portion 32b is formed. Further, a plurality of reinforcing ribs 32c that integrally connect the peripheral plate portion 32 and the front plate portion 31 are formed on the outer peripheral portion of the peripheral plate portion 32 of the cover body 23.

  Further, the emblem 28 includes, for example, an emblem body obtained by appropriately applying a process such as painting or plating to a soft elastomer that is integrally formed, and a metal back play. With these members, the front plate portion 31 of the cover body 23 is provided. Is sandwiched and fixed.

  Further, as shown in FIG. 1, the inflator 25 includes a columnar body portion 25a and a flange portion 25b projecting from the outer peripheral portion of the body portion 25a. The main body portion 25a is provided with a plurality of gas injection ports for injecting gas, and the flange portion 25b is provided with bolt through holes at four locations. Furthermore, a pair of connection portions are provided at the bottom of the main body portion 25a, and connectors at the distal ends of harnesses derived from the connection devices are connected to the respective connection portions. An igniter called a squib or the like is provided inside the main body 25a. Each igniter is activated based on a signal transmitted from each connector, and supplies gas from the gas injection port with predetermined characteristics. It is like that.

  The retainer 26 includes a frame-like retainer main body and four bolt portions which are retainer leg portions projecting downward from the retainer main body, and each bolt portion is not illustrated. A nut is screwed together.

  In assembling the airbag device 4, first, the retainer 26 is inserted into the airbag 22 from the gas inlet 22a, and the retainer is inserted into the bolt through hole of the airbag 22 provided around the gas inlet 22a. Insert the 26 bolts. Then, the airbag 22 is folded into a predetermined shape and stored in the airbag storage portion 33 inside the cover body 23 to which the emblem 28 is attached in advance. Further, the side plate portion 21 b of the base plate 21 is fitted inside the peripheral plate portion 32 of the cover body 23 while inserting each bolt portion into the bolt through hole of the base plate 21. In this state, the engagement portion of the base plate 21 and the engagement receiving portion of the cover body 23 are engaged, that is, the engagement hole 32a and the engagement protrusion 21e are engaged, and the engagement step portion 32b is engaged. The cover hole 23 is retained on the base plate 21 by being engaged with the hole 21f. Furthermore, as necessary, the cover body 23 and the base plate 21 are fixed by fixing means such as rivets, or are tightened and fixed by tightening means such as a metal belt. Further, the main body 25a of the inflator 25 is attached in a state of being inserted into the inflator attachment hole 21c of the base plate 21. That is, the airbag device 4 is configured by inserting the bolt portions of the retainer 26 into the four bolt through holes of the flange portion 25b and screwing and fixing the nuts.

  The airbag device 4 is attached to the steering wheel body 2 by fixing the bracket pieces 21g, 21g of the base plate 21 to the boss plate side of the steering wheel body 2 using bolts or the like. And in the state where the steering wheel 1 provided with this airbag apparatus 4 was equipped in the vehicle, the passenger | crew's jaw part C which is a to-be-protected body has the positional relationship substantially corresponded with the upper end part of the steering wheel 1. .

  Next, the deployment operation of the airbag device 4 will be described.

  When an automobile collides, an appropriate signal is transmitted from the control device to the inflator 25 via the connection device 12, and based on this signal, one or both igniters are operated simultaneously or with a time difference, An inert gas such as nitrogen gas is supplied from the inflator 25 to the inside of the airbag 22, and the airbag 22 folded and stored inflates. Then, the tear line 36 of the cover body 23 is broken by the pressure at which the airbag 22 is inflated and deployed, and the door portion 35 is formed. Further, each door portion 35 is pivoted up and down with the hinge portion 38 as a fulcrum to form a protruding port of the airbag 22. The airbag 22 is inflated from the protruding port and inflated and deployed in front of the occupant. Protect.

  Further, in the present embodiment, since the tear line 36 of the peripheral plate portion 32 is formed as a slit-shaped bottom tear 36e, 36e cut in advance, each side tear 36b, 36b of the front plate portion 31 breaks, As shown in FIG. 4 and FIG. 5, the bottom tears 36e, 36e are in a state of being cleaved all at once, and the upper door part 35a is rapidly deployed so as to be inverted upward with the hinge part 38 as a fulcrum. In addition, since a thin-walled portion 31f that is easily deformed is formed in the portion from the front plate portion 31 to the corner portion of the peripheral plate portion 32, the guide surface portion 39 provided on the back side of the upper door portion 35a is quick. It becomes flat. On the other hand, since the peripheral plate portion 32 has a curved plate shape that forms a part of a cylinder, there is resistance to deformation of the portion of the peripheral plate portion 32 and the portion from the front plate portion 31 to the corner portion of the peripheral plate portion 32. As a result, the momentum of the deployment of the door part 35 is suppressed from becoming excessively large. Further, when the intertea 36c is cleaved, the distal end portion of the door portion 35 is developed so as to spread in the side intersecting the vertical direction, that is, in the left-right direction, and the door portion 35 covers a large area.

  When the upper door portion 35a expands upward, as shown in FIG. 1, the contact portion 37 at the tip of the upper door portion 35a contacts the rim portion 5, and the space of the steering wheel 1 is reached by the upper door portion 35a. B is covered. Therefore, the airbag 22 to be deployed is guided by the guide surface portion 39 provided on the back side of the upper door portion 35a, and is smoothly and rapidly deployed upward without falling into the space B.

  FIG. 6 shows the experimental results using this airbag device 4.

  In this experiment, the occupant is in a state of close deployment in the vicinity of the airbag device 4, but the airbag 22 does not stay below the chin C of the occupant (dummy A) and is deployed covering the occupant's face. It shows a state in which a deployment characteristic favorable for occupant protection is realized.

  As described above, according to the present embodiment, in the airbag device 4 provided in the boss portion 6 located on the inner peripheral side of the rim portion 5 of the steering wheel 1, The space B between the rim portion 5 and the airbag device 4, that is, the boss portion 6 is closed by bridging the main body portion of the bag device 4 and the rim portion 5. By preventing the bag 22 from entering, it is possible to easily realize a preferable deployment characteristic in which the airbag 22 is rapidly and widely flattened to the outer peripheral side, particularly upward, and covers the front of the occupant's face.

  That is, the airbag device has a configuration that realizes preferable deployment characteristics by positively introducing the airbag into the space between the rim portion and the boss portion, but the diameter of the rim portion of the steering wheel is small. In some cases, depending on the combination of the layout of the passenger compartment or the modeling of the cover body, the airbag deployed at the time of proximity deployment does not fully enter the space inside the rim, and accumulates below the passenger's jaw The case where it expands like this is considered. In this regard, in the present embodiment, the airbag 22 is prevented from entering the meter viewing space B inside the rim portion 5 halfway during deployment, and the airbag 22 is connected to the upper rim portion 5 and the occupant's face. By smoothly guiding and deploying between them, it is possible to easily realize a preferable deployment characteristic that can suppress a force that causes the occupant's jaw C to tilt backward even during close deployment.

  Furthermore, in the present embodiment, the distal end portion of the upper door portion 35a of the door portion 35 is a pair of abutment portions 37, which are reversed during deployment and abut against the rim portion 5. Therefore, the door portion 35 is replaced with the rim portion 5. The door 35 reliably covers the space B between the rim 5 and the boss 6, and the airbag 22 enters the space B between the rim 5 and the boss 6 more than necessary. It can be surely prevented.

  Further, the upper door portion 35a is divided into both sides by the center tear 36a. Covering the space B widely, the airbag 22 can be reliably prevented from entering the space B between the rim portion 5 and the boss portion 6 more than necessary, and the airbag 22 can be smoothly guided by the guide surface portion 39.

  Further, since the tear line 36 is formed from the front plate portion 31 to the peripheral plate portion 32, and the tear line 36 is formed in a slit shape at the portion of the peripheral plate portion 32, the tear line 36 of the peripheral plate portion 32 does not become a resistance, and the When the portion of the face plate portion 31 is broken, the tear line 36 is continuously opened to the outer peripheral side, the door portion 35 is expanded smoothly and rapidly to the outer peripheral side, and the opening area where the airbag 22 bulges is increased. The outer peripheral side can be secured, and the deployed guide surface portion 39 of the door portion 35 guides the airbag 22, and a preferable deployment characteristic that the airbag 22 is deployed widely and flatly on the outer circumferential side can be easily realized. On the other hand, the peripheral plate portion 32 has a curved plate shape that forms a part of a cylinder that bulges upward, so that the portion of the peripheral plate portion 32 and the portion from the front plate portion 31 to the corner portion of the peripheral plate portion 32 When the upper portion is deformed to the upper side, it is possible to easily suppress an increase in the resistance of the flat plate-like portion and an excessive increase in the deployment force of the door portion 35, and it is possible to deploy the door portion 35 with an appropriate momentum. The curved door portion 35 can take various shapes in addition to a part of the cylinder bulging upward. For example, a plate shape bulging upward other than a cylinder, a plate shape curved in a wave shape, a plate shape combining these shape portions with a flat plate portion, or a part of a polygonal cylindrical shape, etc. it can.

  In addition, the configuration in which the airbag 22 is widely flattened on the outer peripheral side and achieves favorable deployment characteristics even when closely deployed can be realized by setting the tear line 36 of the cover body 23 and can be realized with a simple structure. In addition, it is not necessary to set a hanging strap having a complicated structure on the airbag 22, and a general airbag 22 can be used. Also, the structure of other members such as the airbag 22 can be simplified. This makes it possible to easily reduce manufacturing costs.

  In the above-described embodiment, the steering wheel 1 including the three spoke portions 7 has been described. However, the present invention is not limited to this configuration, and a configuration including one or two spoke portions 7 or four It can also be set as the structure provided with the spoke part 7. FIG.

  The present invention can be applied not only to an airbag device used in a steering wheel provided in an automobile but also to an airbag device provided in a steering wheel of various moving bodies.

It is explanatory drawing at the time of expansion | deployment of the airbag which shows one Embodiment of the steering wheel provided with the airbag apparatus of this invention. It is explanatory drawing which looked at the cover body of the airbag apparatus same as the above from the back side. It is II sectional drawing of FIG. 2 of the cover body of an airbag apparatus same as the above. It is explanatory drawing which shows the operation | movement at the time of expansion | deployment of the cover body of an airbag apparatus same as the above. It is explanatory drawing which shows the operation | movement at the time of expansion | deployment of the cover body of an airbag apparatus same as the above. It is explanatory drawing which shows the experimental result at the time of expansion | deployment of the airbag of an airbag apparatus same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steering wheel 2 Steering wheel main body 4 Airbag apparatus 5 Rim part 6 Boss part 7 Spoke part
21 Base plate as mounted member
22 airbag
23 Cover body
25 Inflator
31 Front plate
32 Perimeter
33 Airbag storage
35 Door
36 Tearline
36c Intertea as a division
39 Guide area B Space

Claims (6)

A cover body of an airbag device that covers an airbag that is supplied with gas and that is inflated and deployed when not deployed,
An airbag storage section for storing the airbag when not deployed,
A front plate that covers the front side of the airbag housing;
A peripheral plate portion connected to the front plate portion and covering an outer peripheral side of the airbag storage portion;
Formed from the front plate portion to the peripheral plate portion, the front plate portion portion is configured to be more fragile and easily broken than other portions, and the peripheral plate portion portion is a slit-like tear line, and
A door portion that is formed from a portion surrounded by the tear line at the time of tearing of the tear line and expands to the outer peripheral side;
A cover body for an airbag device, comprising: a guide surface portion that is provided on a surface of the door portion facing the airbag storage portion and guides the airbag deployed on the outer peripheral side. The cover body of an airbag device according to claim 1, wherein at least a part of the front plate portion and the peripheral plate portion has a curved plate shape at a position constituting the door portion. The cover body of an airbag device according to claim 1 or 2, wherein the tear line is provided with a dividing portion that deploys the distal end portion of the door portion in a direction crossing the deployment direction. An air bag that is supplied with gas and inflated and deployed;
The cover body according to any one of claims 1 to 3, wherein the airbag is stored in the airbag storage portion when not deployed.
An inflator for supplying gas to the airbag;
An airbag device comprising: an airbag, a cover body, and a mounted member to which the inflator is attached. A steering wheel body including a rim portion, a boss portion positioned inside the rim portion, and a spoke portion connecting the rim portion and the boss portion;
The airbag device according to claim 4 provided in the boss portion,
A steering wheel, wherein a door portion formed when the airbag of the airbag device is deployed expands to an outer peripheral side to cover a space between the rim portion and the boss portion. The steering wheel according to claim 5, wherein the door portion formed when the airbag of the airbag device is deployed is deployed on the outer peripheral side and comes into contact with the rim portion.

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