JP5247586B2 - Airbag device - Google Patents

Description

  The present invention relates to an airbag device including an airbag that inflates and deploys, for example, facing an occupant's knee seated in an automobile seat.

  2. Description of the Related Art Conventionally, a so-called knee airbag device, which is a knee protection airbag device that deploys an airbag facing an occupant's knee or the like seated in a car seat, is known. This knee airbag device is disposed, for example, below the glove box in front of the passenger seat or under the steering wheel in front of the driver seat on the instrument panel, and a bag-like airbag is provided inside the case body. Folded small and stored. When the control device detects an impact such as a frontal collision of the vehicle, gas is supplied from the inflator to the airbag, the airbag projects from the case body, and the airbag is further connected to the instrument panel and the occupant's knee. The limbs of the occupant are restrained and protected by being inflated and deployed.

  In such an airbag device, a hook-like convex portion is formed on the front and rear portions of the case body which is a container portion for storing the airbag, and the cover body is located on the bulging side of the airbag and attached to the instrument panel. A structure in which concave portions are formed in the front and rear portions and the cover body is locked to the case body by engaging the convex portions and the concave portions (see, for example, Patent Documents 1 and 2), or the concave portions are notched in the cover body. Forming a projection on the case body, attaching the bracket to the case body that protrudes from the insertion section that is inserted into the projection fitted into the recess and prevents the projection from coming out of the recess; There is known a configuration in which a cover body is locked to a case body by using a so-called saddle structure (see, for example, Patent Document 3).

JP 9-20202 A (page 4-5, FIG. 4) Japanese Patent Laying-Open No. 2005-335406 (page 3, FIG. 2-4) JP 2005-67439 A (page 3-4, FIG. 1)

  However, in the configurations described in Patent Documents 1 and 2 described above, the cover body is rotated forward by engaging the convex portion of the rear portion of the case body with the concave portion of the rear portion of the cover body. Since the convex part of the front part of the case body is engaged with the concave part of the front part while deforming, the efficiency of assembling the cover body to the case body is not good. In addition, in this configuration, when the airbag is deployed, particularly when the airbag is deployed at a high temperature, the case body is pushed and inflated by the airbag. It is necessary to increase the rigidity of the cover body so that it does not come off, and the efficiency of assembling the cover body to the case body is not good.

  Moreover, in the structure described in the above-mentioned patent document 3, since a separate bracket is used, the number of parts increases, and it takes time to fix the bracket, and the efficiency of the work of assembling the cover body to the case body is increased. Not good.

  The present invention has been made in view of these points, and an object thereof is to provide an airbag device that can firmly attach a cover body to a container portion with good workability without increasing the number of parts. .

  The airbag apparatus according to claim 1 is an airbag that inflates and deploys when gas is introduced, a container portion that includes a container portion main body that accommodates the airbag in a folded state, and the inflation of the airbag. A cover body that covers the side and is attached to the container portion and opens a protruding opening of the airbag when the airbag is deployed; and a locking connection portion that engages and connects one end of the cover body to the container portion. A fixing connection part for fixing and connecting the other end of the cover body to the container part, and the locking connection part is formed from the container part main body so that the distal end part is bent with respect to the base end part. An engagement piece formed to protrude, a stopper formed to protrude from the container body at a position spaced from the tip of the engagement piece, and formed at one end of the cover body. It has a locking hole with which the piece part engages, An attachment piece for restricting the position of the cover body by contact with the stopper and preventing the engagement hole from coming off the engagement piece, the attachment piece being the engagement piece A distance between the front end portion of the engaging piece portion and the stopper portion is smaller than a distance between the front end portion of the engaging portion and the stopper portion. And is set to be smaller than the separation dimension between the distal end portion of the engagement piece portion and the container portion main body.

  According to a second aspect of the present invention, in the airbag device of the first aspect, the attachment piece portion has a protruding portion that is formed to protrude from the tip portion and can come into contact with the stopper portion. It has a receiving part which can be inserted between the joint piece part and the stopper part, and can insert the projection part when the cover body is assembled.

  According to the airbag device of claim 1, the thickness dimension of the attachment piece formed at one end of the cover body is made smaller than the distance between the tip of the engagement piece and the stopper, and the tip of the attachment piece The distance between the engagement piece portion and the stopper portion is larger than the distance between the distal end portion of the engagement piece portion and the stopper portion, and smaller than the distance between the distal end portion of the engagement piece portion and the container portion main body. Thus, after the attachment piece portion is inserted between the distal end portion of the engagement piece portion and the stopper portion, the other end of the cover body is rotated so that the distal end portion of the engagement piece portion becomes the edge of the locking hole. Since one end of the cover body is locked and fixed to the container portion by the locking connection portion and the other end of the cover body is fixedly connected to the container portion via the fixed connection portion in this state. The cover body can be firmly attached to the container portion with good workability without increasing the number of points.

  According to the airbag device of the second aspect, in addition to the effect of the airbag device of the first aspect, the protrusion is formed so as to protrude from the distal end portion of the attachment piece portion to the stopper portion. The interference distance between the tip of the combined piece and the edge of the locking hole can be increased by the protrusion dimension of the protrusion, and the engagement piece can be prevented from coming off from the locking hole more reliably. When the body is assembled to the container part, the protrusion part is inserted into the receiving part formed on the container part body between the tip of the engagement piece part and the stopper part, so that the protrusion part is attached to the container part body. Does not interfere with assembly.

FIG. 5 is an explanatory cross-sectional view schematically showing a method of assembling the cover body of the airbag device according to the embodiment of the present invention to the container portion in the order of (a) to (d). FIG. 3 is a partial enlarged perspective view schematically showing a method of assembling the cover body of the airbag device to the container part in the order of (a) to (d). It is explanatory sectional drawing which shows each dimensional relationship of the latching connection part of an airbag apparatus same as the above. It is explanatory drawing which shows each dimensional relationship of the latching connection part of an airbag apparatus same as the above. It is a disassembled perspective view which shows a part of airbag apparatus same as the above. It is a perspective view which shows the state which attached the cover body of the airbag apparatus same as the above to the container part. It is explanatory drawing which shows typically the installation state and operation state of an airbag apparatus same as the above. It is explanatory drawing which shows the latching connection part vicinity of the airbag apparatus of other embodiment of this invention.

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

  In FIGS. 1 and 5 to 7, reference numeral 10 denotes an airbag device. The airbag device 10 includes an airbag 11 (FIG. 7), and is used as an interior portion of a vehicle body 12 of an automobile as a mounted member. It is arranged on a panel 14 constituting a predetermined surface facing the passenger compartment 13. The airbag device 10 is also referred to as a knee airbag device, that is, a knee protection airbag device. When the airbag device 10 receives an impact such as a frontal collision, as shown in FIG. The leg is deployed to face the lower limb A including the knee A1, and the limb A including the occupant's knee A1 is restrained to protect the occupant. Hereinafter, the direction such as the front-rear direction is based on the straight direction of the vehicle body 12, that is, the front of the vehicle (the direction of arrow F) is the base end side of the airbag 11, and the rear of the vehicle is the front end side of the airbag 11. That is, it becomes an occupant side, and upper U and lower D will be described with reference to the vehicle. Furthermore, the width direction that is the left-right direction of the vehicle is also the both-side direction of the airbag 11, that is, the width direction that is the left-right direction (the arrow W direction shown in FIG. 4).

  As shown in FIG. 7, the vehicle body 12 includes a pair of seats on both sides in which a passenger can sit in a passenger compartment 13, and a windshield 16 and an instrument panel 17 are placed in front of these seats. Is arranged. Further, a panel 14 called a dash panel or the like constituting the instrument panel 17 is disposed in a lower part or a middle part below the instrument panel 17, and the airbag device is opposed to each seat on the panel 14. 10 is installed. One seat is a passenger seat, and a glove box or the like is disposed between the instrument panel 17 and the panel 14. The other seat (not shown) is a driver seat, and a steering wheel is disposed between the instrument panel 17 and the panel 14. In addition to the airbag device 10 described above, the passenger compartment 13 is provided with an unillustrated airbag device (assist airbag device) for the passenger on the instrument panel 17, and further includes a steering wheel, a seat. An air bag device (not shown) is provided on the side portion, the roof side rail, and the like.

  As shown in FIG. 5, the airbag device 10 includes a case body 21 that is a container portion, an inflator 22 attached to the case body 21, the airbag 11, a cover body 25, and the like.

  The case body 21 is also called a base or a housing, and is formed integrally with the case main body 31 formed by press molding or the like, and a case main body 31 that is a container main body formed by press molding or the like. The first and second bracket portions 32 and 33 are provided, and the first and second bracket portions 32 and 33 are formed in a substantially box shape with an opening 34 opened at the rear. The inside of the case body 21 is an airbag storage part.

  The case main body 31 includes one and other end plate portions 36 and 37 that are long in the width direction and are connected vertically between the front portions of the end plate portions 36 and 37. 38 and 39 are integrated. Further, on both the left and right sides of the front portion of one end plate portion 36, a front upper mounting portion 41 (only one is shown) which is a first mounting portion protruding forward is integrally formed. Further, on both the left and right sides of one end plate portion 36, a connecting piece portion 42 (only one is shown) for connecting to one bracket portion 32 is integrally formed, and downward on both sides of one bracket portion 32. It is bent. The other end plate portion 37 is slightly inclined downward from the front side to the rear side. Further, a front lower mounting portion 43, which is a second mounting portion protruding forward, is integrally formed at a substantially central portion in the width direction of the front portion of the other end plate portion 37. A plurality of stopper portions 45 are formed so as to protrude downward from the other end plate portion 37 in the first direction.

  Here, as shown in FIG. 2, the stopper portion 45 is a standing wall formed by bending up from the other end plate portion 37 into a square shape. That is, at the rear part of the stopper part 45, a cutout hole 47 which is a hole part as a rectangular hole-shaped receiving part formed by bending the stopper part 45 is arranged. Further, the stoppers 45 and the cutout holes 47 are arranged at substantially equal intervals in the width direction.

  As shown in FIG. 5, one bracket portion 32 includes one bracket portion main body 51 that is long in the width direction, and side plate portions 52 and 52 formed on both sides of the one bracket portion main body 51. One bracket part body 51 is integrally provided with a receiving plate part 53 formed at the rear end part. The one bracket part main body 51 is integrally fixed to the upper part on the rear side of the one end plate part 36 of the case main body part 31 and protrudes rearward from the one end plate part 36. Further, the side plate parts 52, 52 define both sides of the airbag housing part, and are bent downward from both sides of one bracket part body 51. Further, the upper side of the front part of these side plate parts 52, 52 is integrally connected to the connecting piece parts 42, 42 of the case body part 31. Further, the rear portions of these side plate portions 52, 52 are inclined so as to be gradually positioned on the front side toward the lower side. Brackets 54, 54 for fixing the airbag device 10 together with the cover body 25 to a mounting member (not shown) of the vehicle body 12 (FIG. 7) are located at positions on the outer side of the side plate portions 52, 52 in the front-rear direction. Are integrally attached.

  The receiving plate portion 53 is formed in a planar shape along the vertical direction, and includes a plurality of fixing holes 57 for fixing the airbag device 10 to the mounting member of the vehicle body 12, the case body 21, and the cover body 25. A plurality of attachment holes 58 for attaching and fixing to each other are formed.

  The other bracket portion 33 includes the other bracket portion main body 61 that is long in the width direction, and side attachment portions 62 and 62 that are third attachment portions formed on both sides of the other bracket portion main body 61. And a plurality of engaging piece portions 63 protruding from the front end portion of the other bracket portion main body 61 are integrally provided. The other bracket part main body 61 is integrally fixed to the lower part of the rear side of the other end plate part 37 of the case main body part 31 and protrudes rearward from the other end plate part 37. Further, the side attachment portions 62 and 62 are integrally connected to the lower side of the front portion of the side plate portions 52 and 52 of the one bracket portion 32.

  Here, the engagement piece portion 63 is also called a hook, and is for locking the cover body 25 to the case body 21. Further, the same number of engaging pieces 63 as the stoppers 45 of the case main body 31, that is, the cutout holes 47, are arranged at positions corresponding to these stoppers 45, that is, the cutout holes 47. That is, the engagement piece parts 63 are spaced apart at substantially equal intervals in the width direction. Further, each engagement piece 63 has an L-shape toward the front in which the engagement portion 63b on the front end side, that is, the front side, is in the second direction with respect to the engagement piece base 63a protruding substantially downward (downward front side). The front end 63c, which is the tip of the engaging portion 63b, is set to be substantially equal in position in the front-rear direction to the rear edge of each corresponding cutout hole 47. Further, each engagement piece 63 is spaced rearward from the corresponding stopper 45. That is, between the front end portion 63c of the engagement portion 63b of each engagement piece portion 63 and each stopper portion 45, an insertion port 65 (FIGS. 1A and 2A) facing the lower portion of the cutout hole 47 is provided. )) Is formed. The engaging portions 63b of the engaging piece portions 63 are located below the lower end portions of the corresponding stopper portions 45.

  The opening 34 has a rectangular shape whose longitudinal direction is on both sides, and is slightly inclined downward.

  Further, the inflator 22 shown in FIG. 7 has an inflator body portion having a substantially columnar shape, a gas injection portion is provided near one end portion of the inflator body portion, and is connected to the other end portion of the inflator body portion. Is provided. The inflator 22 is connected to the control device via a harness (not shown) connected to the connection portion, and injects gas from the gas injection portion based on an activation signal supplied from the control device via the harness. Further, the inflator 22 is attached to the case body 21.

  Furthermore, as shown in FIG. 5, the cover body 25 is also called a lid or the like, and is formed of a synthetic resin or the like. The cover body 25 is formed in a longitudinally long cover body 71 along the width direction, side plates 72 and 72 formed on the left and right sides of the cover body 71, and a front end that is one end of the cover body 71. A plurality of mounting piece portions 73 and a fixing plate portion 74 formed at the rear end which is the other end of the cover main body 71 are integrally provided. The cover main body 71 is a portion that covers the opening 34 of the case body 21, has a shape set corresponding to a design such as the panel 14 (FIG. 7), and has a tear line (not shown) that is a fragile fracture portion. It is formed in a letter shape. The side plates 72, 72 cover the outside of the side plate portions 52, 52 of one bracket body 51 with the cover body 25 assembled to the case body 21, and the cover body 25 is assembled to the case body 21. Thus, the bracket portions 76 and 76 that are opposed to and contact the rear side of the brackets 54 and 54 on the case body 21 side are formed so as to protrude sideways. These bracket portions 76 and 76 together with the brackets 54 and 54 are for fixing the airbag device 10 to the mounting member of the vehicle body 12.

  Here, the attachment piece portion 73 is also called a hook hook portion, and is for engaging the cover body 25 with the case body 21. As shown in FIGS. 1, 2, and 5, a plurality of attachment pieces 73 are formed corresponding to the engagement pieces 63 on the case body 21 side, and are opposite to the design surface of the cover body 71. From the back surface, that is, from the back surface side, a mounting piece base 73a that protrudes upward in the state where the cover body 25 is assembled to the case body 21, respectively, and a mounting piece end that protrudes from the tip of the mounting piece base 73a The unit 73b is integrally formed. Each attachment piece end portion 73b is formed in a flat plate shape except for the vicinity of the tip end portion 73c. Reinforcing ribs 73d and 73d are integrally formed between the attachment piece base portions 73a on the left and right sides of the attachment piece end portions 73b. Furthermore, each attachment piece end portion 73b is formed with a square hole-like locking hole 73e in which the engagement portion 63b of the engagement piece portion 63 is engaged with the front edge portion. A plurality of protrusions 73f are formed to project from the tip 73c of each attachment piece end 73b. As shown in FIG. 3, the thickness dimension T of each attachment piece 73 is the front-rear dimension of the insertion port 65, that is, between the front end 63 c of the engagement part 63 b of the engagement piece 63 and the stopper part 45. It is set smaller than the interval L1 along the horizontal direction.

  The locking hole 73e is also called a hook hooking hole, and is formed at a position closer to the base end side of the attachment piece end 73b. As shown in FIG. 3, the distance L2 between the front edge of the locking hole 73e and the tip 73c of the attachment piece end 73b is equal to the front end 63c of the engagement portion 63b of the engagement piece 63 and the stopper. And the amount of protrusion of the engaging piece 63 from the case body 21, that is, the front end 63c of the engaging piece 63b of the engaging piece 63 and the case The distance from the main body 31 is set to be smaller than the distance L3 between the front end 63c of the engaging portion 63b of the engaging piece 63 and the lower surface of the other end plate portion 37 of the case body 21. Has been. Furthermore, the length dimension L4 along the longitudinal direction of the engagement piece portion 63 of the locking hole 73e is set smaller than the length dimension L5 along the horizontal direction of the attachment piece portion 73.

  As shown in FIGS. 2 and 4, the protrusion 73f protrudes from the tip 73c of the attachment piece end 73b of the attachment piece 73 with a protrusion dimension L6. Further, these protrusions 73f are respectively located in the center region in the width direction of the attachment piece end 73b, face the stopper portion 45 in a state where the cover body 25 is assembled to the case body 21, and contact the stopper portion 45. It is possible to contact. The protrusions 73f are formed in a size that can be inserted into the cutout hole 47. Here, these protrusions 73f can have any shape, but for example, it is preferable to have a shape in which the width dimension on the distal end side is smaller than the base end. In the present embodiment, the protrusions 73f are formed in a semicircular shape on the tip side, but may be formed in a triangular shape, for example. Then, the front side of the cover body 25 is locked and connected to the case body 21 by the stopper portion 45, the engaging piece portion 63, and the mounting piece portion 73 including the locking hole 73e and the protruding portion 73f. A locking connecting portion 78 is configured.

  Further, as shown in FIG. 5, the fixed plate portion 74 is a portion that faces and contacts the receiving plate portion 53 in a state in which the cover body 25 is assembled to the case body 21. A plurality of cover body fixing holes 81 corresponding to the fixing holes 57 and a plurality of cover body mounting holes 82 corresponding to the plurality of mounting holes 58 of the receiving plate portion 53 are formed. Then, a linear fixing member 84 (FIG. 6) such as a rivet or a bolt is inserted and fixed in the mounting hole 58 and the cover body mounting hole 82 along the front-rear direction, so that the rear of the cover body 25 The upper side is fixed to the case body 21. That is, the mounting hole 58, the cover body mounting hole 82, the fixing member 84, and the like constitute a fixed connection portion 86 for fixing and connecting the rear side, which is the other end side of the cover body 25, to the case body 21. Yes.

  The airbag 11 shown in FIG. 7 is formed into a bag shape by sewing a plurality of base fabrics, folded into a predetermined shape, and stored in the airbag storage portion of the case body 21.

  Next, an assembly process of the airbag device 10 will be described.

  First, the airbag 11 and the inflator 22 are combined to form an assembly. Next, the airbag 11 is folded in a small size, and wrapped as necessary to hold the folded shape to form an assembly.

  Further, the assembly is inserted into the case body 21 through the opening 34, and the airbag 11, the inflator 22, and the like are fixed to the case body 21. Next, the airbag apparatus 10 is configured by attaching the cover body 25 to the case body 21 and covering the opening 34, that is, the airbag 11.

  When the cover body 25 is attached, first, as shown in FIGS. 1 (a) and 2 (a), the attachment piece 73 is set in a vertical state, and FIGS. 1 (b) and 2 (b). As shown, each mounting piece 73 of the cover body 25 is connected to each other end plate 37 of the case main body 31 between each engaging piece 63 and each stopper 45 from each insertion port 65. Then, it is inserted along the vertical direction which is the first assembly direction (the arrow X1 direction shown in FIG. 1B).

  At this time, the protrusion 73f of each attachment piece 73 is inserted into the cutout hole 47, and the attachment piece end 73b of each attachment piece 73 comes into contact with the lower surface of the other end plate portion 37 of the case body 31. As shown in FIG. 3, the distance L2 between the distal end portion 73c of the attachment piece end portion 73b of each attachment piece portion 73 and each locking hole 73e is equal to the front end portion 63c of the engagement portion 63b of each engagement piece portion 63 and the case. Since it is smaller than the distance L3 between the lower surface of the other end plate part 37 of the body 21, the engaging part 63b of each engaging piece part 63 faces each locking hole 73e.

  Next, as shown in FIGS. 1 (c) and 2 (c), the rear side of the cover body 25 is directed upward with the contact position between each mounting piece 73 and the other end plate portion 37 as the center of rotation. That is, by rotating a predetermined angle, for example, about 90 ° in the direction of the arrow X2 (the direction of the arrow X3 in FIG. 1 (d)), as shown in FIGS. 1 (d) and 2 (d), The engaging portion 63b of the piece 63 is inserted into each locking hole 73e and engaged with the front edge of each locking hole 73e of each mounting piece 73 along the horizontal direction which is the second assembly direction. . In this state, as shown in FIG. 4, each attachment piece 73 is in a position where the projection 73 f abuts against the stopper 45. Then, the distance L2 between the distal end portion 73c of the attachment piece end portion 73b of each attachment piece portion 73 and each locking hole 73e, and the sum of this distance L2 and the projection dimension L6 of the projection portion 73f is the engagement piece portion 63. Since the distance L1 between the front end portion 63c of the engaging portion 63b and the stopper portion 45 in the horizontal direction is larger than the engaging portion 63b of each engaging piece portion 63 and the front edge of each locking hole 73e. Since the interference portion 88 that overlaps (wraps) in the front-rear direction by the difference between the sum of the distance L2 and the protruding dimension L6 and the distance L1 is formed, the front lower portion of the cover body 25 is placed in the case by the locking connection portion 78. Locked to the body 21.

  Furthermore, the fixing member 84 is formed in a substantially horizontal shape from the rear to the front in the plurality of mounting holes 58 of the receiving plate portion 53 of the case body 21 and the cover body mounting holes 82 of the fixing plate portion 74 of the cover body 25 that are aligned with each other. As a result, the rear upper part of the cover body 25 is fixed to the case body 21 by the fixed connecting portion 86 (FIG. 6).

  Thereafter, the mounting portions 41 and 43 of the case body 21 shown in FIG. 1 and the like are fixed to the mounting member of the vehicle body 12 using mounting tools such as bolts and nuts, and the surface portion of the cover body 25 faces the panel 14. The airbag apparatus 10 is installed in the vehicle body 12 by attaching the airbag apparatus 10 to the vehicle body 12 so as to be uniform and electrically connecting a harness connected to the inflator 22 to the control means.

  Next, a deployment operation of the airbag device 10 will be described.

  When the control device detects an impact such as a frontal collision of an automobile, the control device supplies electric power as an activation signal through the harness and activates the inflator 22. Then, when gas is supplied from the inflator 22 into the airbag 11, the airbag 11 inflates inside the case body 21, first ruptures the wrapping, and then breaks the cover body 25 at the tear line, It swells from the case body 21 to the vehicle compartment 13 through the projecting opening formed in the cover body 25, and further expands and deploys along the panel 14 upward in the rear direction as the deployment direction.

  In this manner, the airbag 11 inflated and deployed along the lower limb portion A of the occupant can prevent and protect the occupant from slipping downward in the front side.

  As described above, in the present embodiment, the thickness dimension T of each attachment piece 73 formed at the front end of the cover body 25 is set so that the front end portion 63c of the engagement portion 63b of each engagement piece portion 63 and each stopper portion 45 have the same thickness. The distance L2 between the distal end portion 73c of the mounting piece end portion 73b of each mounting piece portion 73 and each locking hole 73e is made smaller than the interval L1 along the horizontal direction, and the engaging portion 63b of each engaging piece portion 63 The front end portion 63c of each engagement piece 63 is larger than the horizontal distance L1 between the front end portion 63c and each stopper portion 45, and the other end plate portion 37 of the engagement main body 63 and the other end plate portion 37 of the case main body 31. It was made smaller than the distance L3, which is the separation dimension between the lower surface of the surface.

  For this reason, after inserting each attachment piece 73 between the engagement portion 63b of each engagement piece portion 63 and each stopper portion 45, by rotating the rear end of the cover body 25, each engagement piece The engaging portion 63b of the portion 63 is engaged with the edge of each locking hole 73e, and the front end of the cover body 25 is locked and connected to the case body 21 by the locking connecting portion 78, and in this locked state, The cover body 25 can be assembled and fixed to the case body 21 by connecting and fixing the rear end of the cover body 25 to the case body 21 via the fixed connection portion 86.

  As a result, for example, the cover body 25 can be moved to the case body 21 without increasing the number of parts compared to the conventional example in which a separate bracket or the like is used for assembling the cover body to the case body. It can be firmly attached, the efficiency of this attachment work can be improved, the weight of the airbag device 10 can be reduced, and the tip 73c (projection 73f) of the attachment piece end 73b of each attachment piece 73 and each Since the position of the cover body 25 is regulated by the contact with the stopper portion 45 and each locking hole 73e is prevented from coming off from each engagement piece 63, the cover body 25 and the case body 21 can be easily detached. It can be difficult.

  That is, when the engagement piece 63 is simply engaged with the locking hole 73e, the case body 21 is pushed and inflated by the airbag 11 when the airbag 11 is deployed, particularly at a high temperature. In this embodiment, it is necessary to increase the rigidity so that the engagement piece portion 63 does not disengage from the engagement hole 73d when the cover body 25 that is cleaved from the tear line rotates. Since the position of the cover body 25 is regulated by the contact between the mounting piece portion 73 and the stopper portion 45, the cover body 25 can be easily removed from the case body 21 even when the airbag 11 is deployed.

  In addition, the fixed connecting portion 86 has linear fixing members 84 in the plurality of mounting holes 58 of the receiving plate portion 53 of the case body 21 and the cover body mounting holes 82 of the fixing plate portion 74 of the cover body 25 that are aligned with each other. Since the rear side of the cover body 25 can be easily fixed to the case body 21 by inserting the cover body 25 from the rear to the front in a substantially horizontal shape, there is no need to perform an operation such as engaging the cover body 25 while deforming it. Can be firmly attached to the case body 21 with good workability.

  Furthermore, with respect to the configuration in which the engagement piece 63 is engaged with the locking hole 73e and the cover body 25 is engaged with the case body 21, the magnitude relationship between the thickness dimension T and the distance L1, and the distance L2 and the distance By simply forming the stopper portion 45 so as to set various dimensions such as the magnitude relationship with L1 and the distance L3, it is possible to easily realize a configuration in which the cover body 25 is not easily detached from the case body 21 without requiring a large design change.

  In addition, a protrusion 73f that can come into contact with the stopper 45 from the tip 73c of the attachment piece end 73b of the attachment piece 73 is formed to project with the front end 63c of the engagement portion 63b of the engagement piece 63. The interference distance with the edge of the stop hole 73e can be increased by the protrusion dimension L6 of the protrusion 73f. Therefore, since the interference portion 88 can be made larger, it is possible to more reliably prevent the engagement piece portion 63 from coming off from the locking hole 73e, and when the cover body 25 is assembled to the case body 21, the case body When the protrusion 73f is inserted into the cutout hole 47 formed between the engagement portion 63b of the engagement piece 63 and the stopper 45, the protrusion 73f interferes with the case body 21 and is assembled. There is no hindrance.

  In addition, since the tip of the protrusion 73f has a shape such as a semicircular shape in which the width dimension gradually decreases toward the tip, the contact portion between the protrusion 73f and the stopper 45 can be suppressed. It is possible to prevent a so-called lower sound generated by contact between 73f and the stopper portion 45.

  In the above-described embodiment, by forming a recess in the other end plate portion 37 in place of the cutout hole 47, interference between the other end plate portion 37 and the projection 73f during assembly work is avoided. It is good also as a structure.

  Further, for example, as in another embodiment shown in FIG. 8, the protrusion 73 f is not provided on the attachment piece 73, and the tip 73 c of the attachment piece end 73 b of the attachment piece 73 is brought into direct contact with the stopper portion 45. It is good also as a structure.

  In each of the above embodiments, any number of stopper portions 45, engaging piece portions 63, and attachment piece portions 73 may be formed as long as they correspond to each other.

  Furthermore, the shape of the cover body 71 of the cover body 25 can be appropriately configured corresponding to the shape of the panel 14 to be attached.

  The airbag device 10 can be applied to a so-called assist airbag device that protects an occupant seated in a passenger seat, in addition to the configuration installed on the panel 14 of the instrument panel 17.

  The present invention can be applied not only to various airbag devices such as a knee airbag device or an assist airbag device provided in a vehicle, but also to an airbag device that protects an occupant by providing a moving body other than a vehicle.

10 Airbag device
11 Airbag
21 Case body as container
25 Cover body
31 Case body that is the container body
45 Stopper
47 Cutout hole as receiving part
63 Engagement piece
73 Mounting piece
73e Locking hole
73f Projection
78 Locking connection
86 Fixed connection

Claims (2)

An airbag that is inflated and deployed by introducing gas;
A container part having a container part body for storing the airbag in a folded state;
A cover body that covers the bulging side of the airbag and is attached to the container portion, and that opens the protruding port of the airbag when the airbag is deployed;
A locking connection portion that locks and connects one end of the cover body to the container portion;
A fixed connection part for fixing and connecting the other end of the cover body to the container part;
The locking connecting portion is
An engagement piece formed to protrude from the container body so that the distal end bends with respect to the proximal end,
A stopper portion that protrudes from the container body at a position spaced from the tip of the engagement piece,
The engagement piece portion is formed at one end of the cover body and has a locking hole with which the engagement piece portion engages, and the position of the cover body is regulated by contact between the tip portion and the stopper portion. A mounting piece for preventing the locking hole from coming off,
The attachment piece portion has a thickness dimension smaller than a distance between the tip portion of the engagement piece portion and the stopper portion, and a distance between the tip portion and the locking hole is equal to that of the engagement piece portion. An airbag device, wherein the airbag device is set to be larger than an interval between the distal end portion and the stopper portion and smaller than a separation dimension between the distal end portion of the engagement piece portion and the container portion main body. The mounting piece portion has a protruding portion that protrudes from the tip portion and can contact the stopper portion,
The container part main body has a receiving part which is located between the engaging piece part and the stopper part and into which the protruding part can be inserted when the cover body is assembled. Airbag device.

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