JP2012176690A - Case of airbag apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and lightweight back plate of an airbag apparatus capable of mitigating stress concentration to a part of a vertical wall part attributable to deformation of the vertical wall part when an airbag is inflated.SOLUTION: A vertical wall part 42 is erected around a base plate part 41 of a back plate body 38. A cutout part 49 is formed by cutting out the vertical wall part 42 from the base plate 41 side to a fore end. Projecting wall parts 51, 51 projecting outward of the cutout part 49 are provided on both edges of the cutout part 49. A piece part 39 different from the back plate body 38 is mounted on the back plate body 38. The piece part 39 receives the projecting wall parts 51, 51 opposite to each other to control the deformation amount of the vertical wall part 42 outward of both sides of the cutout part 49. Stress concentration to a part of the vertical wall part 42 attributable to the deformation of the vertical wall part 42 when an airbag is inflated, can be reliably mitigated by the piece part 39. The back plate body 38 can be thin-walled so as to be deformed following the inflation of the airbag, resulting in reduction in size and weight.

Description

  The present invention relates to a case body of an airbag device that houses a folded airbag therein.

  Conventionally, an airbag device provided in a steering wheel or the like that is a handle of a vehicle such as an automobile has been used. The airbag device includes an airbag formed in a bag shape, an inflator that supplies gas to the airbag, and a storage device that stores the airbag in a non-deployed state. The storage device includes a case body that stores a folded airbag and the like, and a cover body that is attached to the case body and covers the airbag. The case body is configured by a cylindrical wall portion, and the cover body is provided with a cylindrical attachment wall portion that is externally fitted to and connected to the wall portion when attached to the case body. Yes.

  And as such an airbag device, a wire member for latch is arranged facing each of the plurality of notches provided in the wall portion of the case body, and the wire member is attached to the hook portion protruding from the steering wheel body. The structure which can be attached to a steering wheel main body by one-touch by making it engage with is known (for example, refer patent document 1).

JP-T-2003-501307 (pages 13-17, FIG. 1)

  The folded airbag is instantly inflated by being filled with the gas supplied from the inflator. At that time, since a part of the cover body is cleaved and deployed due to the inflation pressure of the airbag, a load is applied to the cover wall of the cover body so that the cover wall is opened to the outside when the cover part is cleaved. Will be added. For this reason, a load is also applied to the wall portion of the case body connected to the mounting wall portion so as to open outward following the development of the cover body. In particular, the deformation stress accompanying the inflation of the airbag is concentrated in the notch in the wall of the case body. Accordingly, in order to obtain rigidity capable of withstanding such a load, when the case body is thickened or a reinforcing rib is provided on the case body, there is a problem that layout space and mass increase. .

  The present invention has been made in view of the above points, and can be reduced in size and weight, and can relieve stress concentration on a part of the wall portion due to deformation of the wall portion when the airbag is inflated. An object is to provide a case body of an airbag device.

  The case body of the airbag device according to claim 1 is a case body of an airbag device that accommodates a folded bag-shaped airbag therein, and a bottom portion, a wall portion erected around the bottom portion, A case body having a notch provided by notching the wall from the bottom side to the tip, and a receiving part projecting outward on both side edges of the notch, and the case A control that is attached to the case body separately from the main body and controls the deformation amount of the wall portion outwardly on both sides of the notch portion by facing the receiving portions on both side edges of the notch portion. And a member.

  The case body of the airbag device according to claim 2 is the case body of the airbag device according to claim 1, wherein at least a part of the control member has a gap between the receiving portions on both side edges of the notch portion of the case body main body. And a connecting portion that connects the facing portions.

  The case body of the airbag device according to claim 3 is the case body of the airbag device according to claim 2, wherein each of the facing portions is spaced from the receiving portions on both side edges of the notch portion as the distance from the bottom of the case body body increases. Each has a large inclined portion.

  According to the case body of the airbag device according to claim 1, the wall portion is easily deformed outward on both sides of the notch portion by the notch portion provided by notching the wall portion of the case body body from the bottom side to the tip end portion. However, the airbag is inflated by controlling the amount of deformation of the wall part by receiving the receiving part projecting outward from both side edges of the notch part by the control member separately from the case body main body. The thickness of the case body can be reduced so that the stress caused by the deformation of the wall at the time can be relieved by the control member and the deformation of the case body follows the expansion of the airbag. It becomes possible to reduce the size and weight.

  According to the case body of the airbag device according to claim 2, in addition to the effect of the case body of the airbag device according to claim 1, at least a part of the facing portion of the control member is formed on both side edges of the notch portion of the case body body. By facing each receiving part via a gap, the amount of deformation of the wall part outwardly on both sides of the notch part can be easily made according to the size of the gap between each facing part and the receiving part on both side edges of the notch part. By connecting these opposing parts with the connecting part, the load applied to one opposing part due to the deformation of the wall part on one side of the notch part due to the inflation of the airbag can be controlled on the other side of the notch part. Since the wall portion can be supported by the load applied to the other facing portion due to the deformation of the wall portion, the concentration of stress on a part of the wall portion due to the deformation of the wall portion when the airbag is inflated can be more reliably mitigated.

  According to the case body of the airbag device according to claim 3, in addition to the effect of the case body of the airbag device according to claim 2, the receiving portions on both side edges of the notch portion of the wall portion are further away from the bottom portion. Since the amount of outward deformation at the time of inflation of the air bag increases, each opposing portion is provided with an inclined portion having a larger gap with the receiving portions on both side edges of the notch portion as it is farther from the bottom of the case body. The concentration of stress on a part of the wall portion due to the deformation of the wall portion during expansion of the wall portion can be more reliably mitigated, and the deformation amount of the wall portion of the case body can be easily controlled by the angle of the inclined portion.

It is a perspective view which shows one Embodiment of the case body of the airbag apparatus of this invention. It is a perspective view which shows the control member of the case body of an airbag apparatus same as the above. (A) is sectional drawing which shows typically the non-deployment state of the airbag of the case body of an airbag apparatus same as the above, (b) is sectional drawing which shows typically the deployment state of the airbag of the case body of the airbag apparatus same as the above It is. It is sectional drawing of a handle provided with the case body of an airbag apparatus same as the above. It is a front view of a handle same as the above.

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

  4 and 5, reference numeral 10 denotes an airbag device. The airbag device 10 is mounted on the occupant side of a steering wheel 11 as a handle disposed in front of an occupant of a driver seat of a vehicle such as an automobile. Yes.

  The steering wheel 11 includes, for example, a rim portion 12 as an annular grip portion, a boss portion 13 that is located inside the rim portion 12 and is connected to a steering shaft as a steering device (not shown), the rim portion 12 and the boss A plurality of spoke portions 14 that connect the portion 13 are provided. The steering wheel 11 is attached to a steering shaft that is normally provided in an inclined state.Hereinafter, the airbag device 10 side is the occupant side, the front side or the rear side, the steering shaft side is the vehicle body side, With reference to the back side or the front side, the front-rear direction along the steering shaft is defined as the axial direction, and other directions such as the front-rear direction and the up-down direction are described with reference to the straight direction of the vehicle body provided with the steering wheel 11.

  The airbag device 10 includes an airbag cover 21 as a cover body, a back plate 22 as a base plate as a case body, an inflator 23 attached to the back plate 22, an airbag (not shown), a retainer 25, and An attachment mechanism (not shown) that is attached to the back plate 22 and attaches the airbag device 10 to the steering wheel 11 side is provided. The airbag cover 21 and the back plate 22 constitute a storage device 27 that stores part or all of the airbag.

  The air bag cover 21 is formed integrally with a member such as a synthetic resin, and a front plate portion 31 as a cover body covering the front side of a portion extending from the boss portion 13 to the spoke portion 14 of the steering wheel 11, and the front plate And a mounting plate portion 32 as a mounting wall portion projecting downward in a rectangular tube shape from the back side of the portion 31.

  As shown in FIG. 3, a groove-like tear line 33 having a small thickness is formed on the back side of the front plate portion 31 at a position surrounded by the mounting plate portion 32. It is configured to be cleaved and deployed along the tear line 33.

  The mounting plate portion 32 is formed in, for example, a polygonal cylindrical shape. Further, the mounting plate portion 32 is provided with a plurality of openings 34 and a plurality of locking projections for engaging with the back plate 22.

  Each opening 34 is a quadrangular through hole formed through the attachment plate portion 32.

  Each locking projection is formed to project in a claw shape from the front end side of the mounting plate portion 32 to the inside.

  The back plate 22 also serves as a horn plate of a horn mechanism, and is integrally injection-molded with, for example, a synthetic resin. As shown in FIGS. 1 and 3, the back plate 22 includes a back plate main body 38 as a base plate main body as a case main body, and a sandwiching body as a control member separate from the back plate main body 38. A certain piece 39 is provided.

  The back plate main body 38 includes a base plate portion 41 as a bottom portion, and a vertical wall portion 42 as a cylindrical wall portion projecting (standing) on the upper side (front side) over the entire periphery of the base plate portion 41. And has a box shape with an opening 43 on the upper side.

  The substrate portion 41 has, for example, a polygonal shape, and a circular inflator mounting hole 44 is provided at the center, and for example, four mounting holes 45 are provided surrounding the inflator mounting hole 44. Further, a contact metal plate (not shown) is integrally disposed on the back surface side of the substrate portion 41 around the inflator mounting hole 44 and the mounting hole 45 by insert molding or the like. The metal plate is fixed with horn switch movable contacts at a plurality of locations. Further, the substrate portion 41 is provided with a plurality of groove portions 46 on the front surface side (front side). These groove portions 46 facilitate the deformation of the back plate 22 by the pressure when the airbag is inflated.

  Further, the standing wall portion 42 has a polygonal cylindrical shape corresponding to the substrate portion 41. Further, a hook portion 47 as a plurality of engagement portions and a plurality of engagement receiving portions 48 for engaging and holding the airbag cover 21 (FIG. 3) are provided outside the standing wall portion 42, respectively. . The standing wall portion 42 is provided with a notch 49.

  The hook portions 47 project from the outer surface of the standing wall portion 42 and have an L shape, and a plurality of hook portions 47 are arranged around the standing wall portion 42. The hook portions 47 are engaged with the openings 34 of the airbag cover 21 to constitute an engagement structure that receives outward spreading of the mounting plate portion 32 when the airbag is inflated.

  Further, in the present embodiment, the engagement receiving portion 48 is recessed over the substrate portion 41 at a position closer to the base end side than the hook portion 47 of the standing wall portion 42. These engagement receiving portions 48 are engaged with the respective locking projections of the airbag cover 21 to securely hold the airbag cover 21 to the back plate 22 when the airbag is deployed. The fixing structure that holds

  Further, the notch 49 forms a part of the mounting mechanism, for example, is located at the rear part of the back plate 22 and the central part in the left-right width direction, and extends straight from the substrate part 41 side to the tip part of the standing wall part 42. And is continuous with the opening 43. That is, the notch 49 is provided by notching the standing wall 42 in the entire vertical direction. For this reason, the standing wall portion 42 is separated from the left and right at the position of the notch portion 49. Further, on both side edges of the notch 49, the inner side (inner surface side) of the back plate 22 with respect to the standing wall 42 and outward of the notch 49, in other words, both sides away from each other ( Projecting wall portions 51, 51 which are notched portion side facing portions as projecting portions are provided in a projecting direction (counter-approaching direction).

  The protruding wall portions 51 and 51 are opposed wall portions 51a and 51a that are provided to protrude forward substantially perpendicularly to the standing wall portion 42, and bent portions that are continuous to the tip portions of the opposed wall portions 51a and 51a. 51b and 51b are integrally formed and bent in an L shape (reverse L shape) in plan view. The opposing wall portions 51a and 51a are continuous from the substrate portion 41 to the tip end portion of the standing wall portion 42, that is, over the entire side edges of the cutout portion 49, respectively. Further, the bent portions 51b and 51b are folded back in a direction away from each other, that is, outward from the notch 49, in other words, in a direction opposite to the direction protruding into the space in the notch 49. In other words, the bent portion 51b located at one side edge of the notch 49 protrudes toward one side, and the bent portion 51b located at the other edge of the notch 49 protrudes toward the other side.

  On the other hand, the piece 39 is for connecting the both side edges of the notch 49, and is attached to the back plate main body 38 at a position corresponding to the notch 49 inside the standing wall 42. The piece 39 is integrally formed of, for example, a synthetic resin, and includes a pair of facing portions 53 and 53 and a connecting portion 54 that connects the facing portions 53 and 53, as shown in FIG. It is substantially C-shaped in plan view. And this piece part 39 is the opening 43 side so that opposed parts 53 and 53 may be inserted between bent parts 51b and 51b of projection wall parts 51 and 51, and standing wall part 42, for example to backplate main part 38. It can be attached by sliding it from.

  As shown in FIG. 1, the facing portions 53 and 53 are positioned to face the protruding wall portions 51 and 51 of the back plate body 38 in a state where the piece portion 39 is attached to the back plate body 38. As shown in FIG. 2, inclined portions 53b and 53b and linear portions 53c and 53c are provided vertically on support surfaces 53a and 53a, which are end surfaces facing each other.

  The inclined portions 53b and 53b are inclined so as to be separated from each other toward the upper side, that is, in an upwardly expanding manner. Further, as shown in FIGS. 1 and 3A, the inclined portions 53b and 53b are formed on the protruding wall portions 51 and 51 of the back plate main body 38 in a state where the piece portion 39 is attached to the back plate main body 38. The opposing wall portions 51a and 51a are opposed to each other with a gap G therebetween. Therefore, the gap G is set to increase as the distance from the substrate 41 of the back plate body 38 increases.

  Further, the straight portions 53c and 53c sandwich the protruding wall portions 51 and 51 of the back plate body 38 from both the left and right sides in a state where the piece portion 39 is attached to the back plate body 38. In other words, these straight portions 53c and 53c are positioned without a gap or substantially without a gap with respect to the outside of the opposing wall portions 51a and 51a of the protruding wall portions 51 and 51.

  The connecting portion 54 includes connecting wall portions 54a and 54a projecting in a direction substantially perpendicular to the facing portions 53 and 53 on the side opposite to the supporting surfaces 53a and 53a of the facing portions 53 and 53, and these connecting walls. A flat connecting portion main body 54b continuous between the portions 54a and 54a is integrally provided. Then, with the piece 39 attached to the back plate main body 38, the connecting wall portions 54a, 54a are spaced apart and opposed to the bent portions 51b, 51b of the protruding wall portion 51, and the connecting portion main body 54b is It is located over both front sides of the notch 49.

  An inflator 23 shown in FIG. 4 includes a disc-shaped inflator main body 23a inserted and fitted into the inflator mounting hole 44 of the back plate 22, and a substrate of the back plate 22 protruding from the inflator main body 23a on the outer peripheral side. And a flange portion 23b fixed to the portion 41. Further, a gas injection port (not shown) is provided around the inflator body 23a, and attachment holes (not shown) are provided at four locations on the flange 23b. In addition, a connector (not shown) connected to the control device is provided at the bottom of the inflator body 23a.

  In addition, the airbag is formed in a flat bag shape by stitching the outer peripheral portions of two base fabrics, for example, and in the center portion of one base fabric, as in the case of the back plate 22, Inflator mounting holes and four mounting holes provided so as to surround the inflator mounting holes.

  The retainer 25 includes a retainer base 25a formed of a metal plate or the like, and four mounting bolts (not shown) fixed to the retainer base 25a. The retainer base 25a is provided with a circular inflator mounting hole 25b at the center. The mounting bolts are provided on the back side so as to surround the inflator mounting holes 25b, and nuts (not shown) are respectively screwed together.

  The attachment mechanism attaches the airbag device 10 to the steering wheel so as to be able to advance and retract. Each of these attachment mechanisms is formed integrally with a resin having an insulating property so as to cover a part of the back plate 22 and, as shown in FIG. Coil springs are attached to each.

  The wire 56 can also be called a one-touch wire, and is used to fix the airbag device 10 to the metal core 11a of the steering wheel 11 in a detachable manner, and is formed in a U-shape by elastically deformable wire. . Further, the wire 56 is guided so as to be able to perform a push operation, and is exposed from a notch opening 58 and a notch 49 which are formed by notching the middle part of both ends on the side of the substrate part 41 on both sides of the standing wall part 42. is doing. As shown in FIG. 4, engaging protrusions 11 b protruding from the core metal 11 a of the steering wheel 11 are inserted into the notch openings 58 and 49, and these engaging protrusions 11 b are connected to the wires 56. Engaged with each other. Therefore, the airbag device 10 is supported at three points (three locations) with respect to the core metal 11a of the steering wheel 11.

  The coil spring is for urging the airbag device 10 to the front side with respect to the steering wheel, and is held by a urging means mounting portion (not shown) protruding from the back side of the base plate portion 41. Yes.

  The airbag apparatus 10 includes an inflator 23, an airbag, an airbag cover 21, and a retainer on a back plate 22 in which a piece 39 (FIG. 1), a wire 56, a coil spring, and the like are attached to the back plate main body 38. Constructed with 25 attached.

  Further, the retainer 25 is inserted inside the airbag, and the airbag is folded into a predetermined shape in a state where the mounting bolt of the retainer 25 is pulled out from the mounting hole. Further, the back plate 22 is inserted into the airbag cover 21 that covers the folded airbag. That is, the standing wall portion 42 of the back plate 22 is inserted into the attachment plate portion 32 of the airbag cover 21.

  At this time, the locking projection of the airbag cover 21 is in sliding contact with the outer surface of the standing wall portion 42 of the back plate 22, so that the mounting plate portion 32 protrudes outward by the projection dimension of the locking projection from the mounting plate portion 32. It is bent and spread. In this state, the back plate 22 is further pushed into the airbag cover 21 side, so that the tips of the hook portions 47 whose outer surfaces slide on the inner surface of the mounting plate portion 32 are inserted into the openings 34 respectively. The mounting plate portion 32 is restored and deformed inward, and the locking projection is inserted and engaged with the engagement receiving portion 48. That is, the airbag cover 21 and the back plate 22 are directly attached and fixed with one touch only by inserting and pushing the back plate 22 into the airbag cover 21.

  Thereafter, the airbag, the retainer 25, and the airbag cover 21 are combined with the back plate 22 while inserting the mounting bolts of the retainer 25 into the mounting holes 45.

  Further, the inflator 23 is combined from the back side of the back plate 22 while inserting the mounting hole into the mounting bolt protruding to the back side of the back plate 22, and a nut is screwed onto the mounting bolt and tightened. In this state, the front side portion of the inflator main body 23a provided with the gas injection port of the inflator 23 is inserted into the inside of the airbag from the inflator mounting hole 44, and the airbag device 10 is configured.

  When the airbag device 10 is pushed into the steering wheel 11 from the front side, the engagement protrusions 11b on the steering wheel 11 side are engaged with the wires 56 of the attachment mechanism, and the airbag device 10 is attached to the steering wheel at a plurality of locations. It is attached with one touch so that it can be engaged with 11 and supported.

  Furthermore, the steering wheel 11 provided with the airbag device 10 is configured to be attached to the steering shaft by performing various electrical wiring.

  The steering wheel 11 configured as described above is operated when the occupant in the driver's seat grips the rim portion 12 and rotates. Further, when the occupant pushes the airbag cover 21 of the airbag device 10 that also serves as a pushing portion against the urging force of the coil spring, electrical continuity occurs, and the horn device on the vehicle body side is blown. .

  Further, for example, in the event of a frontal collision of the vehicle, gas is rapidly injected from the inflator 23 into the airbag, and the airbag stored in a folded state is rapidly inflated. Then, due to the inflation pressure of the airbag, a part of the airbag cover 21 is cleaved along the tear line 33 as shown in FIG. The airbag protrudes from 61 and is inflated and deployed in front of the occupant to restrain and protect the occupant.

  At this time, the hook portion 47 projecting from the upright wall portion 42 of the back plate 22 located inside the airbag cover 21 is engaged with the opening portion 34 of the airbag cover 21, thereby The airbag cover 21 is firmly held on the back plate 22 when the bag is inflated to prevent the airbag cover 21 from falling off and to the outside of the mounting plate portion 32 of the airbag cover 21 due to the inflation pressure of the airbag. The spread is supported by the standing wall portion 42 of the back plate 22. Therefore, the standing wall portion 42 is also slightly deformed so as to spread outward. Therefore, in the cutout portion 49, both side edges of the cutout portion 49, that is, the projecting wall portions 51, 51 are deformed so as to open outward (both sides). By receiving from both sides by the support surfaces 53a, 53a of 53, the deformation of the projecting wall portions 51, 51 is regulated following the inclined portions 53b, 53b, and one of the standing wall portions 42 accompanying the deformation of the back plate 22 is controlled. Stress concentration on the part (such as both side edges of the notch 49) is alleviated. In FIG. 3B, the deformation of the airbag cover 21 and the back plate 22 is exaggerated for the sake of clarity.

  Further, since the engagement protrusion of the airbag cover 21 is in contact with the engagement receiving portion 48 of the back plate 22, the position of the airbag cover 21 in the front-rear direction with respect to the back plate 22 is restricted, and the airbag is deployed. Sometimes the airbag cover 21 is firmly held on the back plate 22 side (steering wheel 11 side).

  Thus, according to the present embodiment, the standing wall portion 42 is formed on both sides outward of the notch portion 49 by the notch portion 49 provided by notching the standing wall portion 42 of the back plate body 38 from the substrate portion 41 side to the tip portion. The protruding wall portions 51 and 51 projecting outward from both side edges of the notch 49 while being easily deformed to the opposite side are received by the back plate main body 38 and the separate piece 39 so as to face each other. By controlling the amount of deformation of the air bag, it is possible to reliably relieve stress concentration on a part of the standing wall portion 42 due to the deformation of the standing wall portion 42 when the airbag is inflated by the piece portion 39 and to inflate the airbag. The back plate body 38 can be thinned to follow and deform, that is, it is possible to reduce the thickness and reinforcing ribs, so that the structure does not have more rigidity than necessary, and can be reduced in size and weight. become. Therefore, the layout space of the airbag device 10 (the storage device 27) can be taken, and the strength of the back plate 22 can be secured while reducing the manufacturing cost.

  Specifically, the facing portions 53 and 53 of the piece portion 39 are respectively connected to the protruding wall portions 51 and 51 (opposing wall portions 51a and 51a) on both side edges of the cutout portion 49 of the back plate main body 38 through a predetermined gap G. By facing each other, the outer sides of the notch 49 are arranged in accordance with the size of the gap G between the opposing walls 53 and 53 and the projecting walls 51 and 51 (opposite walls 51a and 51a) on both sides of the notch 49. The amount of deformation (following amount) of the standing wall portion 42 toward the side can be easily controlled, and the facing wall 53 on one side of the cutout portion 49 due to the inflation of the airbag is obtained by connecting the facing portions 53 and 53 with the connecting portion 54. Since the load applied to one facing portion 53 due to the deformation of the portion 42 can be supported by the load applied to the other facing portion 53 due to the deformation of the standing wall portion 42 on the other side of the notch 49, the standing wall portion when the airbag is inflated The concentration of stress on a part of the standing wall portion 42 due to the deformation of 42 can be more reliably mitigated.

  Further, since the airbag cover 21 and the back plate 22 can be deformed so as to spread outward when the airbag is inflated, the airbag's protruding opening 61 is further expanded to facilitate deployment of the airbag. .

  Further, the protruding wall portions 51, 51 on both side edges of the cutout portion 49 of the standing wall portion 42 have a greater amount of outward deformation when the airbag is inflated as the distance from the base plate portion 41 increases. By providing inclined portions 53b and 53b having a larger gap G with the protruding wall portions 51 and 51 (opposite wall portions 51a and 51a) on both side edges of the cutout portion 49 as the distance from the substrate portion 41 of the back plate body 38 increases, The concentration of stress on a part of the standing wall portion 42 due to the deformation of the standing wall portion 42 when the airbag is inflated can be more reliably mitigated, and the back plate body 38 can be set by appropriately setting the angles of the inclined portions 53b and 53b. The amount of deformation of the standing wall 42 can be easily controlled.

  In the above embodiment, the handle is the steering wheel 11 having an annular rim portion. However, the handle is not limited to this configuration. For example, the handle includes an arc-shaped rim portion whose upper end portion is not continuous. It can also be applied to.

  Further, any number of the notches 49 can be provided at any location, such as before and after the standing wall 42, or on the left and right. In this case, the same operation and effect as in the above embodiment can be achieved by attaching the piece portions 39 corresponding to the respective cutout portions 49.

  Further, the shape of the back plate 22 can be arbitrarily set other than the polygonal shape.

  In the above embodiment, the back plate 22 is formed of synthetic resin. However, the back plate 22 may be formed of, for example, a steel plate. Even in this case, the steel plate or the like is thinned by controlling the deformation amount of the projecting wall portion 51 by receiving the projecting wall portion 51 projecting outward from both side edges of the notch portion 49 by the piece portion 39. It is possible to use a thin steel plate, etc., and it is possible to reduce the size and weight, and alleviate the stress concentration on a part of the standing wall portion 42 due to the deformation of the standing wall portion 42 when the airbag is inflated For example, the same operational effects as in the above-described embodiment can be achieved.

  The present invention can be applied to, for example, a case body of an airbag device for a driver's seat occupant provided in a steering wheel of an automobile.

10 Airbag device
22 Back plate as a case body
38 Back plate body as the case body
39 Block as control member
41 Substrate as the bottom
42 Standing wall as wall
49 Notch
51 Protruding wall as a receiving part
53 Opposite part
53b Slope
54 Connection

Claims (3)

A case body of an airbag device for storing a folded bag-like airbag therein,
A bottom part, a wall part standing around the bottom part, a notch part provided by notching the wall part from the bottom part side to the tip part, and projecting outward on both side edges of the notch part A case body with a receiving part,
Separately from the case body main body, attached to the case body main body, and receiving the receiving portions on both side edges of the notch portion so as to face each other, the deformation amount of the wall portion outwardly on both sides of the notch portion is reduced. A case body of an airbag device comprising: a control member for controlling. The control member is
At least a part facing each other through the gap to the receiving part on both side edges of the cutout part of the case body body,
The case body of the airbag device according to claim 1, further comprising: a connecting portion that connects the facing portions. The case body of the airbag device according to claim 2, wherein each of the opposing portions has an inclined portion having a larger gap with the receiving portions on both side edges of the notch portion as it is farther from the bottom of the case body main body. .

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