JP2009286150A - Airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device capable of accurately catching residue contained in expansion gas discharged from an inflator, by a catching member of simple constitution. <P>SOLUTION: The airbag device M1 comprises an airbag 11, an inflator 17, a case 22, and a retainer 40 for attaching the airbag to the case. The inflator is held to the case in a state of inserting an arranged part of gas discharge ports 19 into the airbag through an inflow opening 12 of the airbag and an insertion hole 24 of the case. The catching member 47 capable of catching the residue S contained in expansion gas is disposed around the gas discharge ports 19. The catching member has catching recesses 51 recessed from a general facing surface 49 of a facing wall part 48 to catch the residue S sticking to the inner surfaces 52. The catching recesses have openings 50 independent of one another for every corresponding gas discharge port and enabling the expansion gas immediately after discharged from the corresponding gas discharge ports, to flow into the inner surface 52 side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an airbag device mounted on a vehicle, and more particularly to an airbag device in which an inflator that supplies an inflation gas for inflating an airbag discharges an inflation gas containing a residue.

  Conventionally, in an airbag device, an airbag having an inflow opening for inflating gas, an inflator for supplying inflating gas, a case for holding a folded airbag and an inflator, and a periphery of the inflow opening are held down. An annular retainer for attaching the airbag to the case was provided. When the inflator is a pyro type that generates an expansion gas by a chemical reaction during operation, a high-temperature residue is included when the expansion gas is generated, and the high-temperature residue is not removed or cooled. If it flows to the airbag side, the airbag may be damaged.

In order to cope with this, there has been an airbag device in which a filter-like capturing member that captures a residue is disposed around a gas discharge port that discharges an inflating gas in a main body of an inflator (see, for example, Patent Document 1). ). Further, the inflation gas discharged from the gas discharge port is once directed downward from the airbag so that the inflation gas containing the residue does not immediately flow to the airbag side, and then the airbag. There is also an airbag apparatus provided with a baffle plate for changing the direction of the flow of the inflation gas that is raised to the side (see, for example, Patent Document 2).
JP 2000-52914 A Utility Model Registration No. 3049075

  However, in the configuration in which the residue is captured by the filter as in the airbag device described in Patent Document 1, two members, the filter itself and the holding member that holds the filter, are required, which increases the number of component parts and is simple. There was room for improvement in the point of manufacturing. Furthermore, in recent inflators, from the viewpoint of weight reduction, the built-in heavy filter is eliminated or reduced, and a separate filter is provided outside the inflator to reduce the weight of the inflator. Contrary to conversion, it is not preferable.

  Moreover, in the airbag apparatus described in Patent Document 2, the baffle plate has a configuration in which a groove is formed so as to widen the internal space along the direction around the axis of the main body of the inflator, and the inner surface of the groove Residue will adhere to the (concave surface), but if the inflating gas flowing in the direction of the axis of the main part of the inflator hits the adhering residue, it will immediately scatter and then the airbag Along with the inflating gas flowing to the side, the situation of flowing to the airbag side and damaging the airbag could not be prevented, and there was room for improvement in terms of residue capture performance.

  This invention solves the above-mentioned subject, and it aims at providing the airbag apparatus which can capture | acquire accurately the residue contained in the gas for inflation discharged from an inflator with the capture member of simple structure. To do.

An airbag device according to the present invention includes an airbag having an inflow opening for inflation gas;
An inflator having a columnar main body formed by disposing a plurality of gas discharge ports for discharging inflation gas along the circumferential direction of the outer peripheral surface on the upper side;
A case for storing and holding a folded airbag;
An annular retainer having a presser portion that is attached to the case by pressing the periphery of the inflow opening of the airbag;
Configured with
While the inflator is inserted into the airbag through the inflow opening and the insertion hole provided in the case, the arrangement part of the gas outlet of the main body is held in the case,
Air in which a capture member capable of capturing a residue contained in an inflating gas discharged from the gas discharge port is disposed around a portion where the gas discharge port of the main body portion inserted into the airbag is disposed. A bag device,
The capture member
Around the arrangement part of the gas discharge port of the main body part, an opposing wall part that is arranged so as to be opened along the upper and lower direction with the upper side opened,
Capable of capturing the residue from the general facing surface of the facing wall that faces the main body, away from the main body, and attaching the residue of the inflation gas discharged from each gas outlet to the recessed inner surface A recess for capturing,
Configured with
Each of the trapping recesses has an opening that allows each of the corresponding gas discharge ports to flow into the inner side surface of the expansion gas immediately after discharge discharged from the corresponding gas discharge port. , Characterized in that it is recessed from the general facing surface of the periphery.

  In the specification of the present application, the description of the scope of claims is the same, but the top and bottom directions of the main body portion of the inflator are relatively the main body portion provided with the gas discharge port unless otherwise specified. In other words, the direction toward the inner peripheral side of the airbag along the axis of the inflow opening of the airbag (corresponding to the axis of the main body) is upward. However, the present invention is not limited to the actual vertical direction at the mounting portion of the vehicle on which the airbag device is mounted.

  In the airbag apparatus according to the present invention, when the inflator is activated, the inflation gas is discharged from each gas discharge port on the outer peripheral surface of the main body. The inflation gas immediately after discharge discharged from each gas discharge port flows into the corresponding catching recess recessed from the general facing surface of the facing wall, and the residue adheres to the recessed inner surface of the catching recess. To leave the catching recess. In addition, since the residue contained in the expansion gas immediately after being discharged from each gas discharge port is heavier than the gas of the expansion gas itself and is sticky, the concave inner surface of each capture recess Easy to adhere to. Each capture recess has an opening that is independent from each other for each corresponding gas discharge port, and that allows the inflation gas immediately after discharge discharged from the corresponding gas discharge port to flow into the inner surface side. The expansion gas flowing after flowing into the other catching recesses flows along the general facing surface, and the residue is adhered. It is difficult to flow into the catching recess so as to hit the recessed inner surface, and it simply passes through the area outside the catching recess. As a result, the residue contained in the expansion gas immediately after being discharged from each gas discharge port adheres to the concave inner surface of each capture recess, and is expanded linearly from the further gas discharge port. By the discharge of the working gas, the particles are sequentially deposited while being prevented from being scattered, and the residue contained in the expansion gas discharged from each gas discharge port of the inflator can be captured accurately.

  In addition, the inflation gas in a state where the residue is captured passes through the facing wall portion along the generally facing surface, and then flows to the airbag side to inflate the airbag.

  And in the airbag apparatus according to the present invention, the capture member that attaches and captures the residue simply provides a capture recess that is recessed corresponding to each gas discharge port in a part of the opposing wall. It can be formed with a simple configuration, and can be easily manufactured from a sheet metal material using press working or the like.

  Therefore, in the airbag apparatus according to the present invention, the residue contained in the inflation gas discharged from the inflator can be accurately captured by the capture member having a simple configuration that can be easily manufactured.

  The capture member can be formed integrally with the retainer or the case from the viewpoint of facilitating manufacturing, reducing the number of parts, etc. When the capture member is provided integrally with the retainer, What is necessary is just to provide an opposing wall part and each recessed part for capture | acquisition in a vertical wall part so that the vertical wall part extended upwards from a peripheral edge may be provided and a vertical wall part may be used as a capture member. In addition, when the capture member is provided integrally with the case, the case is made of sheet metal, and the capture member is formed by cutting and raising the formation portion of the insertion hole in the case. The formation site can be used effectively.

  Each of the capturing recesses has a portion that intersects the central axis of the corresponding gas discharge port, near the bottom that is most deeply recessed from the general facing surface, and a facing area that is substantially orthogonal to the central axis. It is desirable to form so.

  In such a configuration, since the facing area of each of the capturing recesses faces the inflation gas to be discharged, the residue of the inflation gas is easily attached and easily deposited. The part where the facing area is provided is in the vicinity of the bottom that is most deeply recessed from the general facing surface at the periphery of each capturing recess, and even if a large amount of residue is adhered, the accumulated residue is opposed to the capturing member. It is difficult to protrude from the general facing surface of the wall portion, and it is possible to prevent a situation in which the wall portion is exposed and scattered by the flow of the expanding gas flowing through the other capturing recess.

  In addition, the recessed inner surface of each capture recess may be recessed in a U-shaped cross section, but the expansion gas that flows in so as to contact the outer peripheral edge in the vicinity of the generally opposed surface is If it is formed on the bottom side that is most deeply recessed from the general facing surface, the entire circumference of the outer peripheral edge in the vicinity of the general facing surface is formed as a curved surface that narrows the inner diameter dimension toward the bottom side of the capturing concave portion, the gas discharge The residue of the expansion gas discharged from the outlet can be captured more stably and efficiently. That is, strictly speaking, the expansion gas discharged from the gas discharge port is discharged with a certain injection angle. In other words, in addition to the main body flow that goes straight from the gas discharge port along the central axis toward the catching recess, it is located around the main body flow and spreads in an umbrella shape around the main body flow from the gas discharge port Thus, there is a diffusion flow that is discharged. If the recessed inner surface of each capture recess is configured as described above, the diffusion flow of the expansion gas makes primary contact near the outer peripheral edge of the capture recess and adheres to the primary contact site. Even if it does not, after reflecting, it goes to the bottom part side where the concave part for acquisition was further dented. On the bottom side, the main body flow of the expansion gas is directly facing, the residue contained in the main body flow is easy to accumulate, and the diffusion flow that is in primary contact with the outer peripheral edge of the inner surface collides with Thus, as the residue of the main body flow accumulates, the residue of the diffusion flow easily accumulates on the bottom side. As a result, in the above configuration, the residue of the expansion gas discharged from the gas discharge port can be captured more stably and efficiently.

  In this case, if the inner side surface of each catching recess is formed as a substantially hemispherical curved surface, the residue of the diffusion flow that hits the outer peripheral edge of the inner side surface easily gathers at one point on the recessed bottom side, With the trapping recess, the residue can be deposited and trapped while further suppressing scattering.

  The inflator main body is formed in a columnar shape, and the expansion gas discharged from each gas discharge port is discharged radially from the axis of the main body, and the vertical wall provided in the retainer When the portion is configured as a capture member, the vertical wall portion is formed in a substantially rectangular tube shape, and is disposed around the portion where the gas discharge port of the main body portion is disposed. The trapping recesses located near each corner of the four corners in the vicinity of the trapping recess can prevent the expansion gas from the general facing surface facing the most concave bottom from interfering with the general facing surface near the trapping recess. The edge of the outer peripheral edge on the side away from the corner of the base is shifted and formed on the side away from the bottom so that the distance away from the bottom is longer than the edge of the outer peripheral edge on the nearby corner. Is desirable.

  In such a configuration, the opposing wall portion of the capturing member is disposed in a substantially rectangular tube shape around the gas discharge port arrangement portion of the main body of the inflator, and is captured in the vicinity of each corner portion of the approximately rectangular tube shape. Even if the recesses for use are arranged in a state of being deeply recessed, in the catching recesses near these corners, the expansion gas toward the bottom is the edge of the outer peripheral edge on the side away from the nearby corners. It is possible to flow smoothly so as to hit the bottom without being hit, and to adhere the residue to the bottom. And, the concave portion for capturing near the corner portion suppresses the situation of enlarging the opening that facilitates the flow of the inflation gas flowing after flowing into the other concave portion for capturing, and makes the opening as small as possible, and A large amount of residue can adhere to the bottom as the deeply recessed inner surface.

  In addition, in the case where the vertical wall portion of the retainer has a substantially quadrangular cylindrical shape as described above, the retainer pressing portion has a quadrangular annular shape, and a bolt for holding the airbag and the inflator in the vicinity of the four corners. The air bag and the inflator can be suitably assembled to the case, and the inflator main body is formed in a columnar shape, and the inflation gas is radiated from each gas discharge port. Since it can be discharged, the airbag can be deployed and inflated in a well-balanced manner around the inflator.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. An airbag device M1 of the first embodiment is for a passenger seat, and as shown in FIGS. Instrument panel). In the case of the first embodiment, the airbag device M1 is a top mount type that is disposed inside the upper panel 1a on the surface of the instrument panel 1. The airbag device M1 includes a folded airbag 11, an inflator 17 that supplies inflation gas to the airbag 11, a case 22 that stores and holds the folded airbag 11 and the inflator 17, and the airbag 11. A retainer 40 for attaching to the case 22 and an airbag cover 31 covering the folded airbag 11 are provided.

  As shown in FIGS. 1 and 2, the airbag cover 31 is formed integrally with the instrument panel 1 in the case of the first embodiment. The instrument panel 1 includes a base portion 2 made of a hard synthetic resin such as polypropylene on the back surface side, and a covering layer 3 having a foam layer such as polyurethane foam and a skin layer covering the outer surface side of the base portion 2. Configured. In addition, a soft portion 4 made of a soft synthetic resin such as a polyolefin-based thermoplastic elastomer is disposed in place of the base portion 2 at a portion of the airbag cover 31. The airbag cover 31 is configured by disposing two front and rear door portions 32 around which a thin portion to be broken 34 is disposed. The breakable portion 34 is arranged in an H shape when viewed from the top of the instrument panel 1, and the two front and rear door portions 32, 32 are provided on both the front and rear sides with the front end side and the rear end side as hinge portions 33, respectively. Configured to open.

  Further, a connecting wall portion 35 having a substantially rectangular tube shape that protrudes downward from the back surface side is disposed at a portion of the airbag cover 31 so as to surround the arrangement position of the door portions 32 and 32. A plurality of locking holes 36 are penetrated through the connecting wall portion 35 at predetermined positions in portions facing each other in the front-rear direction. Locking claws 29 formed in the case 22 are inserted into the locking holes 36, and the connecting wall portion 35 is locked to the locking claws 29.

  The case 22 is formed in a substantially rectangular parallelepiped shape made of a sheet metal having a rectangular opening 22a on the upper end side, and the rectangular plate-like bottom wall portion 23 and the outer peripheral edge of the bottom wall portion 23 are formed into a substantially rectangular tube shape. And a side wall 28 extending upward on the bag cover 31 side. The bottom wall portion 23 has a rectangular plate shape extending long in the left-right direction, and has an insertion hole 24 opened in a substantially circular shape at the center so that the upper portion 18a side of the inflator 17 can be inserted from below into the airbag cover 31 side. Have.

  An attachment hole 26 into which the four bolts 42 of the retainer 40 can be inserted is formed at the periphery of the insertion hole 24 on the upper surface side of the bottom wall portion 23, and serves as the attachment seat 25 of the airbag 11. In addition, a bracket 27 that connects the case 22 to the vehicle body 6 side is fixed to the bottom wall portion 23 on the lower surface sides of the left and right side portions of the bottom wall portion 23. A nut 27 a for screwing the bolt 9 is fixed to each bracket 27. A bracket 8 extending from the reinforcement 7 is disposed on the body 6 side, and the bolt 9 passes through the mounting seat 8a of the bracket 8 and is screwed into the nut 27a. By tightening the nuts 27a of the respective bolts 9, the case 22, that is, the airbag device M1, is attached and fixed to the body 6 side.

  The side wall 28 of the case 22 is formed with a plurality of locking claws 29 that are reversed outward and downward from the case 22 at the upper ends of the front and rear parts of the vehicle. As described above, each locking claw 29 is inserted into the locking hole 36 of the connecting wall 35 of the airbag cover 31 to lock the connecting wall 35.

  The inflator 17 is a pyro-type that generates an expansion gas by a combustion reaction of a predetermined gas generating agent. In order to attach the inflator 17 to the case 22 and the cylindrical main body 18 filled with the predetermined gas generating agent. The flange part 20 is comprised (refer FIG. 1, 2). The flange portion 20 is configured as a substantially quadrangular ring (substantially square plate shape) protruding from the outer peripheral surface of the main body portion 18, and includes through holes 20 a at the four corners. Each bolt 42 of the retainer 40 is inserted into each through hole 20a.

  The main body 18 is formed in a columnar shape having an outer diameter that is slightly smaller than the inner diameter of the insertion hole 24 of the bottom wall portion 23, and the expansion gas G is discharged onto the outer peripheral surface 18 b of the upper portion 18 a on the upper side of the flange portion 20. A plurality of gas discharge ports 19 having circular openings are arranged along the circumferential direction of the outer peripheral surface 18b (see FIG. 4). In the case of the embodiment, twelve gas discharge ports 19 are arranged radially at equal intervals around the axis IC of the main body 18. When the expansion gas G is discharged from each gas discharge port 19, the expansion gas G is discharged along the central axis EC (see FIGS. 4 and 5) of each gas discharge port 19. Each central axis EC is disposed so as to extend from the center of the opening of each gas discharge port 19 along the direction orthogonal to the axis CP of the main body 18 and in a radial direction centered on the axis IC of the main body 18. Thus, in the case of the first embodiment, the twelve gas discharge ports 19 are arranged radially around the axis IC, and the mutually adjacent angles θ of the central axes EC (see FIG. 4). Is set to 30 °. The main body 18 has an arrangement portion 18d in which the gas discharge port 19 on the upper portion 18a side is arranged inserted into the case 22 from below the insertion hole 24 of the bottom wall portion 23, and inside the airbag 11. Will also be inserted.

  The airbag 11 is formed of a flexible woven fabric such as polyamide or polyester, and has a substantially square frustum shape that expands from the instrument panel 1 toward the rear side of the occupant side as a shape when the deployment is completed. The shape is expanded. A circular inflow opening 12 for allowing the inflating gas G to flow is disposed on the lower surface side of the front side of the inflated shape of the airbag 11. At the peripheral edge 13 of the inflow opening 12, there is provided an attachment portion 14 that is attached to the attachment seat 25 at the periphery of the insertion hole 24 of the case 22. Four mounting holes 15 are passed through the position. The upper opening 18 a side of the main body 18 of the inflator 17 is inserted into the inflow opening 12, and the bolts 42 of the retainer 40 are inserted into the mounting holes 15.

  1-4, the retainer 40 is formed of a sheet metal, and has an annular pressing portion 41 provided with an insertion hole 44 that opens substantially in the same shape as the insertion hole 24 of the case 22, and reinforcement of the pressing portion 41. And a vertical wall portion 45 having a substantially rectangular tube shape extending from the outer peripheral edge of the presser portion 41 toward the airbag cover 31 side.

  The pressing portion 41 has an outer peripheral edge formed in a substantially square shape (substantially square shape), and bolts 42 as fixing means extending downward are fixed to the four corners thereof. The pressing portion 41 is configured so that the annular mounting portion 14 of the inflow opening 12 of the airbag 11 is connected to the peripheral edge of the insertion hole 24 on the upper surface side of the bottom wall portion 23 of the case 22 from the inner peripheral surface 11a side of the airbag 11. The mounting portion 14 of the airbag 11 is attached to the mounting seat 25 of the case 22 by pressing the annular mounting seat 25 and fastening a nut 43 (see FIG. 1) to each bolt 42.

  Each bolt 42 is inserted into the mounting hole 15 of the airbag 11, the mounting hole 26 of the bottom wall portion 23 of the case 22, and the through hole 20 a of the flange portion 20 of the inflator 17, and the nut 43 is tightened. Thus, the airbag 11 is attached to the upper surface side of the attachment seat 25 of the bottom wall portion 23, and the inflator 17 is attached to the lower surface side of the attachment seat 25 of the bottom wall portion 23.

  And in the case of 1st Embodiment, the vertical wall part 45 of the retainer 40 comprises the capture member 47 which capture | acquires the residue S contained in the gas G for expansion discharged from each gas discharge port 19 of the inflator 17. Yes. The capturing member 47 has an opposing wall portion 48 disposed around the portion 18d where the gas discharge port 19 of the main body portion 18 is disposed, and an attachment surface 53 that can capture the recessed inner surface 52 by attaching the residue S thereto. And a catching recess 51.

  The facing wall portion 48 is disposed so as to be along a substantially vertical direction with a smooth (planar) general facing surface 49 facing the main body portion 18 side being disposed and having an upper portion opened. Each of the capture recesses 51 is independent of each other for each corresponding gas discharge port 19, and can flow the inflation gas G immediately after discharge discharged from the corresponding gas discharge port 19 into the inner surface 52 side. The opening 50 is formed so as to be recessed from the peripheral general facing surface 49. In other words, the opening 50 has at least a discharge port projection area ECA (see FIGS. 4 and 5) for projecting the opening shape of each gas discharge port 19 so as to extend toward the inner side surface 52 along the center axis EC. The shape is set so as to directly hit the bottom 54 side of the catching recess 51 without hitting the surrounding general facing surface 49.

  In the first embodiment, each of the capturing recesses 51 has a portion intersecting the central axis EC of the corresponding gas discharge port 19 in the vicinity of the bottom portion 54 that is most deeply recessed from the general facing surface 49 and the central axis. The facing area 55 is formed so as to face the EC substantially orthogonally.

  Furthermore, in the first embodiment, the inflating gas G that flows in such a way that the concave inner surface 52 of each capturing recess 51 abuts on the outer peripheral edge 56 in the vicinity of the general facing surface 49 is supplied to the capturing recess 51. Reflected on the side of the bottom 54 that is most deeply recessed from the general facing surface 49, is formed as a curved surface that reflects the entire circumference of the outer peripheral edge 56 in the vicinity of the general facing surface 49 toward the bottom 54 side of the capturing concave portion 51. ing. In the case of the first embodiment, in detail, the recessed inner surface 52 of each capturing recess 51 is formed as a substantially hemispherical curved surface.

  In the first embodiment, as shown in FIG. 4, the four planar surfaces on the inner peripheral side of the vertical wall portion 45 (opposing wall portion 48) having a substantially regular square tube shape are respectively formed as general facing surfaces 49 (49A). 49B, 49C, 49D), and three of the twelve of the total twelve recesses 51 are arranged on each of the general facing surfaces 49A, 49B, 49C, 49D. That is, each of the general opposed surfaces 49A, 49B, 49C, 49D is a smooth range between the four corners CN, CN of the substantially rectangular cylindrical vertical wall 45, and three gas discharge ports of the main body 18 are provided. Corresponding to 19, three catching recesses 51 are arranged. In each of the general facing surfaces 49A, 49B, 49C, and 49D, a capturing recess 51C is disposed at the center of each general facing surface 49A, 49B, 49C, and 49D in the direction around the axis of the main body portion 18, and the center capturing surface 51C. The other catching recesses 51L and 51R are arranged at a position of ± 30 ° in the direction around the axis of the axis IC of the main body 18 with the recess 51C for the center as a center. In the case of the first embodiment, the inner surface 52 of each capturing recess 51 is a curved surface that is recessed in a substantially hemispherical shape. Therefore, each of the capturing recesses 51 corresponds not only to the central capturing recess 51C but also to the capturing recesses 51L and 51R located near the corners CN of the four corners of the substantially square cylindrical vertical wall 45. A portion that intersects the central axis EC of each gas discharge port 19 is configured as a facing area 55 that faces the bottom portion 54 that is most deeply recessed and is substantially orthogonal to the central axis EC.

  Further, the size of the opening 50 formed in the general facing surface 49 of each capturing recess 51 is such that the main body flow GM of the inflation gas G discharged from the gas discharge port 19 along the central axis EC is formed in the bottom 54. The diffusion flow GS that can be introduced and is discharged in an umbrella shape so as to diffuse around the main body flow GM is also set to a size that can flow into the area of the inner side surface 52 of the capturing recess 51 ( (See FIGS. 4 and 5).

  Incidentally, in the capturing recess 51 of the first embodiment, the shape of the opening 50 is substantially circular, the radius of curvature R (see FIG. 5) of the substantially hemispherical curved surface of the inner surface 52 is approximately 5 mm, The height H from the upper surface of the presser portion 41 at the center 54a of the bottom portion 54 away from the main body portion 18 of the side surface 52 coincides with the central axis EC of each gas discharge port 19 of the inflator 17 when the airbag device M1 is assembled. So that it is set. The lower edge 56a of the boundary portion of the catching concave portion 51 with the presser portion 41 is formed so as to be shifted to the presser portion 41 side from the boundary portion of the presser portion 41 and the vertical wall portion 45 so that pressing is easy. (See FIG. 5).

  Moreover, the upper end 45a of the vertical wall part 45 which forms the opposing wall part 48 is formed so that it may become substantially the same height as the upper end surface 18c of the main-body part 18 of the inflator 17 at the time of the assembly | attachment of the airbag apparatus M1. .

  Furthermore, at each corner CN of the four corners of the vertical wall portion 45, a notch recess 46 is formed that is recessed downward from the upper end 45a to the vicinity of the arrangement area of each capturing recess 51. Therefore, the expansion gas G from which the residue S has been removed after passing through each of the catching recesses 51 flows again along the general facing surface 49 so as to follow the direction around the axis of the main body 18 of the inflator 17. Then, the air is exhausted out of the retainer 40 through the notch recess 46 without returning to the capturing recess 51 side.

  The mounting of the airbag apparatus M1 of the first embodiment on a vehicle will be described. First, the retainer 40 is disposed inside the airbag 11 so that the bolts 42 protrude from the mounting holes 15. Then, the airbag 11 is folded, and the folded airbag 11 is wrapped with a wrapping sheet 16 (see FIG. 1) that can be broken so as not to collapse.

  Then, the folded airbag 11 is placed on the bottom wall portion 23 of the case 22 from the opening 22a while the bolts 42 are inserted into the mounting holes 26 from above. Next, the upper portion 18 a of the main body portion 18 of the inflator 17 is inserted into the insertion holes 24 and 44 and the inflow opening 12 from below, and the bottom wall portion 23 is inserted into each through hole 20 a of the flange portion 20 of the inflator 17. Each bolt 42 protruding downward is inserted. When the nuts 43 are fastened to the respective bolts 42, the inflator 17 is attached to the attachment seat 25 of the bottom wall portion 23 of the case 22, and the holding portion 41 of the retainer 40 is connected to the inflow opening of the airbag 11. 12, the peripheral edge 13 is pressed against the bottom wall portion 23 side, and the peripheral edge 13 is attached to the mounting seat 25 of the bottom wall portion 23 of the case 22.

  Thereafter, the side wall portion 28 of the case 22 is inserted into the connecting wall portion 35 of the airbag cover 31 in the instrument panel 1 mounted on the vehicle, and the locking claws 29 of the case 22 are inserted into the locking holes of the connecting wall portion 35. 36, the locking claws 29 are locked to the connecting wall portions 35, and the bolts 9 are fastened to the nuts 27a of the brackets 27 via the mounting seats 8a. Can be mounted on.

  If the inflator 17 is actuated after the air bag device M1 is mounted on the vehicle, the inflation gas G is discharged from each gas discharge port 19 on the outer peripheral surface of the main body 18, and the inflation gas G passes through the main body 18. The ink is discharged along a direction orthogonal to the axis CP and in a radial direction centered on the axis IC of the main body 18 (see FIGS. 4 and 5). The inflation gas G immediately after discharge discharged from each gas discharge port 19 flows into the corresponding catching recess 51 recessed from the general facing surface 49 of the facing wall 48, and the catching recess 51 is recessed. The residue S adheres to the inner side surface 52 and is detached from the catching recess 51.

  In addition, since the residue S contained in the expansion gas G immediately after being discharged from each gas discharge port 19 is heavier than the gas of the expansion gas G itself and is sticky, each capture recess 51 It easily adheres to the concave inner surface 52.

  Each of the catching recesses 51 is independent from each other for each corresponding gas discharge port 19 and can flow in the expansion gas G immediately after discharge discharged from the corresponding gas discharge port 19 to the inner surface 52 side. The opening 50 is formed so as to be recessed from the peripheral general facing surface 49. Therefore, as shown in FIG. 4, the expansion gases GL and GR that flow after flowing into the other capture recesses 51 (for example, the capture recesses 51L and 51R) flow along the general facing surface 49. Thus, it is difficult to flow into the catching recess 51 (capture recess 51C) so as to hit the recessed inner surface 52 with the residue S attached, and the area outside the catching recess 51C (generally facing surface 49). It simply passes through the periphery of the upper catching recess 51C. Conversely, the expansion gas GC that has flowed into the capture recess 51C is guided by the general facing surface 49 around the other capture recesses 51L and 51R, and the areas outside the capture recesses 51L and 51R ( It simply passes through the capture concavities 51L and 51R on the general facing surface 49). As a result, the residue S contained in the expansion gas G immediately after being discharged from each gas discharge port 19 adheres to the recessed inner surface 52 of each capture recess 51, and straight from the further gas discharge port 19. As a result of the discharge of the expansion gas G discharged in a shape, the particles are sequentially deposited in a state in which scattering is suppressed, and are included in the expansion gas G discharged from each gas discharge port 19 of the inflator 17. The residue S can be captured accurately.

  In the airbag apparatus M1 according to the first embodiment, the capturing member 47 that attaches and captures the residue S is simply captured in a part of the opposing wall portion 48 so as to correspond to each gas discharge port 19. It can be formed with a simple configuration in which only the concave portion 51 is provided, and can be easily manufactured from a sheet metal material using press working or the like.

  Therefore, in the airbag apparatus M1 of the first embodiment, the residue S contained in the inflation gas G discharged from the inflator 17 can be accurately captured by the capture member 47 having a simple configuration that can be easily manufactured. .

  The inflation gas G in a state where the residue S is captured passes through the portion of the capture member 47 and then flows toward the airbag 11 to inflate the airbag 11. Then, the airbag 11 is inflated to break the wrapping sheet 16 and to break the planned break portion 34 of the airbag cover 31 so that the front and rear door portions 32 and 32 are shown by two-dot chain lines in FIG. As a result, the airbag 11 protrudes greatly from the open openings of the door portions 32 and 32 of the airbag cover 31.

  Incidentally, the airbag apparatus M1 of the first embodiment and the retainer 40F that does not use the retainer 40 of the first embodiment and does not provide the catch recess 51 in the vertical wall portion 45 of the retainer 40 of the first embodiment (see FIG. 15), when the retainer 40 of the first embodiment is used, the trapped amount of the residue S can be improved by about 41%. In this test, the weights of the retainers 40 and 40F before and after the operation of the inflator 17 were measured, and the weight increase of the retainers 40 and 40F due to the residue S adhered was calculated and compared.

  Moreover, in 1st Embodiment, the capture member 47 is formed of the vertical wall part 45 extended upwards from the outer periphery of the pressing part 41 in the retainer 40 made from sheet metal. Such a vertical wall portion 45 is disposed as a reinforcing rib of the holding portion 41 of the retainer 40, and only by forming the general facing surface 49 and the catching concave portion 51 on the vertical wall portion 45, The capture member 47 can be formed. That is, when the retainer 40 is manufactured from a sheet metal material by pressing or the like, the capture member 47 can be easily formed at the same time without increasing the number of components, and the airbag apparatus M1 including the capture member 47 can be easily and easily assembled. It can be manufactured with a reduced number of points.

  In the first embodiment, each of the capturing concave portions 51 intersects the central axis EC of the corresponding gas discharge port 19 in the vicinity of the bottom portion 54 that is most deeply recessed from the general facing surface 49 and the central axis. The facing area 55 is formed so as to face the EC substantially orthogonally. Therefore, since the facing area 55 of each capturing recess 51 faces the discharged expansion gas G, the residue S of the expansion gas G is easily attached and easily deposited (see FIG. 5). ). The portion where the facing area 55 is provided is in the vicinity of the bottom 54 that is most deeply recessed from the general facing surface 49 at the periphery of each capturing recess 51, and even if a large amount of residue S is adhered, the accumulated residue S However, it is difficult to protrude from the general facing surface 49 of the facing wall portion 48 of the capturing member 47, and it is possible to prevent a situation where the gas is exposed and scattered by the flow of the expansion gas G flowing through the other capturing recess 51.

  In the first embodiment, the recessed inner surface 52 of each capturing recess 51 is formed as a substantially hemispherical curved surface, and expands inflow so as to contact the outer peripheral edge 56 in the vicinity of the general facing surface 49. The gas G is reflected to the bottom 54 side that is most deeply recessed from the general facing surface 49 in the capturing concave portion 51, and the entire circumference of the outer peripheral edge 56 in the vicinity of the general facing surface 49 is reflected to the bottom 54 side of the capturing concave portion 51. It is formed as a curved surface that narrows the inner diameter dimension (see FIGS. 4 and 5). Therefore, in each capture recess 51, the residue S of the expansion gas G discharged from the corresponding gas discharge port 19 can be captured more stably and efficiently. This is because, strictly speaking, the expansion gas G discharged from each gas discharge port 19 is discharged with a certain injection angle. In other words, in addition to the main body flow GM linearly extending from the gas discharge port 19 along the central axis EC toward the capturing recess 51, the main body flow GM is positioned around the main body flow GM. There is a diffusion flow GS that is discharged so as to spread in an umbrella shape. If the concave inner side surface 52 of each trapping recess 51 is configured as described above, the diffusion flow GS of the expansion gas G flows through the trapping recess 51 as shown in the partial enlarged view of FIG. Even if the primary contact is made in the vicinity of the outer peripheral edge 56 and it does not adhere to the primary contact site, the light is reflected and then further toward the concave bottom 54 side of the capturing recess 51. The bottom 54 side is in contact with the main body flow GM of the expansion gas G so that the residue S contained in the main body flow GM is easy to accumulate, and is further primary on the outer peripheral edge 56 of the inner side surface 52. The contacted diffusion flow GS gathers so as to collide, and as the residue S of the main body flow GM accumulates, the residue S of the diffusion flow GS also easily accumulates on the bottom 54 side. As a result, in the above configuration, the residue S of the expansion gas G discharged from the gas discharge port 19 can be captured more stably and efficiently.

  In particular, in the first embodiment, the inner side surface 52 of each catching recess 51 is formed as a substantially hemispherical curved surface, and the residue S of the diffusion flow GS hitting the outer peripheral edge 56 of the inner side surface 52 is recessed. It is easy to gather at the center 54a, which is a point on the bottom 54 side, and the catching recesses 51 allow the residue S to be deposited and captured while further suppressing scattering.

  In addition, as a configuration of the inner side surface 52 of the capturing concave portion 51, the expansion gas G that flows in so as to contact the outer peripheral edge 56 in the vicinity of the general facing surface 49 is deepest from the general facing surface 49 in the capturing concave portion 51. In the case where the entire circumference of the outer peripheral edge 56 near the general facing surface 49 is formed as a curved surface with a narrowed inner diameter dimension toward the bottom 54 side of the capturing recess 51 so as to be reflected on the recessed bottom 54 side, the first embodiment Instead of the substantially hemispherical shape like the inner side surface 52 of the embodiment, it may be configured as a catching recess 61 shown in FIG. 6 or a catching recess 71 shown in FIG.

  The capturing recess 61 shown in FIG. 6 has a recessed space shape that is substantially frustoconical, and the bottom 64 that is recessed most deeply from the general facing surface 49 in the capturing recess 61 is planar, but the general facing surface 49 on the inner side surface 62. The entire circumference of the outer peripheral edge 66 in the vicinity is a curved surface that narrows the inner diameter dimension toward the bottom 64 side of the catching recess 61 like a part of a spherical surface. In addition, the capturing recess 71 shown in FIG. 7 has a substantially conical recess shape and a bottom 74 that is deepest from the general facing surface 49 of the capturing recess 71 is hemispherical. The entire circumference of the outer peripheral edge 76 in the vicinity of the facing surface 49 is a curved surface that narrows the inner diameter dimension toward the bottom 74 side of the catching recess 71 like a conical surface.

  Even in these trapping recesses 61 and 71, the diffusion flow GS of the expansion gas G discharged from the gas discharge port 19 is in primary contact with the vicinity of the outer peripheral edges 66 and 76 of the trapping recesses 61 and 71, and the primary Even if it does not adhere to the contact part, after reflecting, it further moves toward the recessed bottom portions 64 and 74 of the capturing recesses 61 and 71. In the vicinity of the bottom portions 64 and 74, there are facing areas 65 and 75 that face the central axis EC of the gas discharge port 19, and in these facing areas 65 and 75, the main body flow of the expansion gas G The residue S contained in the main body flow GM easily deposits, and the diffusion flow GS that has primarily contacted the outer peripheral edges 66 and 76 of the inner side surfaces 62 and 72 collides with the GM. Thus, as the residue S of the main body flow GM accumulates, the residue S of the diffusion flow GS also easily accumulates in the facing areas 65 and 75 on the bottom 54 side. As a result, the residue S of the expansion gas G discharged from the gas discharge port 19 can be captured more stably and efficiently even in the capture recesses 61 and 71 configured as described above.

  If the above actions and effects are not taken into consideration, the concave inner surface of each catching recess may be recessed in a U-shaped cross section.

  Further, as a modified example of the capturing recess 51 of the first embodiment, it is configured to be recessed in two steps like an inner surface 82 of the capturing recess 81 shown in FIG. In addition, the bottom 84 that is recessed most deeply from the general facing surface 49 is further recessed in a hemispherical shape, so that the residue S can be captured at the bottom 84 and a large amount of residue S can be obtained. You may comprise so that it can accommodate.

  Further, as in the capture recess 81A shown in FIG. 9, a fine uneven portion 82a may be provided over the entire area of the recessed inner side surface 82A so as to improve the adhesion performance of the residue S.

  Furthermore, as in the airbag apparatus M2 of the second embodiment shown in FIGS. 10 to 12, the main body portion 18 of the inflator 17 is formed in a columnar shape, and the inflation gas G discharged from each gas discharge port 19 is used. However, when the vertical wall portion 45E provided in the retainer 40E is configured as the capturing member 47E, the vertical wall portion 45E has a substantially square cylindrical shape. In the case where the gas discharge port 19 of the main body 18 is disposed around the site 18d, each of the capturing recesses 91 (91C, 91L, 91R) may be configured as follows. Also in the second embodiment, the discharge recess projection areas ECA (see FIG. 11) in which the respective capture recesses 91 project the opening shape of each gas discharge port 19 so as to extend toward the inner side surface 52 along the respective central axes EC. ) Is a substantially circular opening 50 </ b> E that directly hits the bottom 94 side of the catching recess 91 without hitting the surrounding general facing surface 49. However, in this second embodiment, each of the catching recesses 91 includes an inner side surface 92 that is recessed from the general facing surface 49 in a substantially hemispherical shape, as compared with the first embodiment, and the center of the corresponding gas discharge port 19. A portion that intersects the axis EC is formed to be a facing area 95 that faces the bottom 94 that is most deeply recessed from the general facing surface 49 and faces the central axis EC substantially orthogonally. Further, the inner side surfaces 92 of the respective catching recesses 91 are also recessed in a substantially hemispherical shape as in the first embodiment, so that the outer peripheral edge 96 near the general facing surface 49 abuts the outer peripheral edge 96. The inflating gas G that flows in is configured to be reflected toward the bottom 94 side that is most deeply recessed from the general facing surface 49 in the catching recess 91.

  And in this 2nd Embodiment, the recessed parts 91L and 91R for capture | acquisition located in the corner | corner CN vicinity of the four corners in the substantially square cylinder shape of the vertical wall part 45E are the outer periphery 96 of the side away from the corner | corner CN of the vicinity. The edge 96a is formed so as to be shifted to the side away from the bottom 94 so that the distance away from the bottom 94 is longer than the edge 96b of the outer peripheral edge 96 on the corner CN side in the vicinity (X> Y). (See FIG. 11). In other words, the catching recesses 91L and 91R are formed so as to scrape the edge portion 97 on the side away from the nearby corner CN. The distance for shifting the edge 96a is an expansion gas (for example, an expansion gas that flows in parallel with the diffusion flow GS or the central axis EC) from the general facing surface 49 of the capture recesses 91L and 91R toward the most recessed bottom 94. ) G is a distance X that can prevent G from interfering with the edge portion 49a on the side facing away from the corner CN in the general facing surface 49 in the vicinity of the catching recesses 91L and 91R.

  In the airbag apparatus M2 according to the second embodiment, the same operation and effect as those of the first embodiment can be obtained, and a substantially rectangular tube is provided around the arrangement site 18d of the gas discharge port 19 of the main body 18 of the inflator 17. The opposing wall portion 48E of the capturing member 47E is disposed in a shape, and the capturing recess 91 is disposed in the vicinity of each corner CN of the substantially rectangular tube shape in a deeply recessed state. In the catching recesses 91L and 91R in the vicinity of the corner CN, the expansion gas G toward the bottom 94 does not hit the edge portion 49a of the general facing surface 49 on the side away from the corner CN in the vicinity, and the bottom 94 is smoothly smoothed. The residue S can adhere to the bottom 94. Then, the catching recesses 91L and 91R near the corner CN suppress the situation of enlarging the opening 50E that facilitates the inflow of the expansion gas G that flows after flowing into the other catching recesses 91C. A large amount of residue S can be attached to the bottom portion 94 as the opening 50E as small as possible and the inner surface 92 that is deeply recessed.

  In the case where the vertical wall portions 45E and 45 of the retainers 40E and 40 have a substantially square tube shape as described above, the presser portion 41 of the retainers 40E and 40 is formed into a quadrangular annular shape, and an airbag is provided near the four corners. 11 and the inflator 17 can be provided with fixing means such as bolts 42, the airbag 11 and the inflator 17 can be suitably assembled to the case 22, and the main body of the inflator 17 Since the portion 18 has a cylindrical shape and the inflation gas G can be discharged radially from each gas discharge port 19, the airbag 11 can be deployed and inflated with a good balance around the inflator 17.

  Further, the capturing member 47F may be provided integrally with the case 22F as in the airbag apparatus M3 of the third embodiment shown in FIGS. In the third embodiment, the case 22F is made of sheet metal, and the capturing member 47F is formed by cutting and raising the forming portion of the insertion hole 24 in the case 22F by pressing, and adding a capturing recess 51F that is recessed in a hemispherical shape. is doing. Specifically, while forming the catching recess 51F, the peripheral edge of each opposing wall 48F is cut, and then the opposing wall 48F is bent so as to rise from the bottom wall 23 of the case 22F, thereby obtaining the catching member 47F. Forming. In such a configuration, the formation site of the insertion hole 24 that has been discarded as a remaining material can be effectively used.

  Furthermore, when the capture member 47F is provided at the periphery of the insertion hole 24 of the case 22F, the bottom of the inner surface 52 of each capture recess 51F around each gas discharge port 19 of the main body 18 of the inflator 17 is provided. 54, the outer peripheral edge 56, and the general facing surface 49F of the facing wall portion 48F can be arranged radially around the axis IC of the main body portion 18, and each trapping recess 51F for each gas discharge port 19 can be provided. In addition, the arrangement of the general facing surface 49F can be made uniform.

  In the airbag apparatus M3 of the third embodiment, a retainer 40F that does not have the capturing recess 51 formed in the vertical wall 45F is used.

  In the first to third embodiments, the airbag devices M1, M2, and M3 for the passenger seat have been described. However, a pyro-type inflator is used by being attached to the case. As long as the airbag device is attached using a retainer, the peripheral edge of the inflow opening is not limited to the passenger seat, but to various airbag devices for driver seats, knee protection, pedestrian protection, etc. The present invention can be applied.

It is a schematic longitudinal cross-sectional view along the front-back direction of the vehicle in the airbag apparatus of 1st Embodiment which concerns on this invention. It is a schematic longitudinal cross-sectional view along the left-right direction of the vehicle in the airbag apparatus of 1st Embodiment. It is a perspective view of the retainer of a 1st embodiment. It is a cross-sectional view of the retainer of the first embodiment. It is a partial expansion longitudinal cross-sectional view of the airbag apparatus of 1st Embodiment. It is a partial expanded longitudinal cross-sectional view of the airbag apparatus which uses the modification of the retainer of 1st Embodiment. It is a partial expanded longitudinal cross-sectional view of the airbag apparatus which uses the other modification of the retainer of 1st Embodiment. It is a partial expanded longitudinal cross-sectional view of the airbag apparatus which uses the further another modification of the retainer of 1st Embodiment. It is a partial expanded longitudinal cross-sectional view of the airbag apparatus which uses the further another modification of the retainer of 1st Embodiment. It is a perspective view which shows the retainer used for the airbag apparatus of 2nd Embodiment. It is a cross-sectional view of the retainer of the second embodiment. It is a partial expanded longitudinal cross-sectional view of the airbag apparatus of 2nd Embodiment, and respond | corresponds to the XII-XII site | part of FIG. It is a top view of the case used for the airbag apparatus of 3rd Embodiment. It is a longitudinal cross-sectional view of the case of 3rd Embodiment, and respond | corresponds to the XIV-XIV site | part of FIG. It is a partial expansion longitudinal cross-sectional view of the airbag apparatus of 3rd Embodiment.

Explanation of symbols

11 ... Airbag,
12 ... inflow opening,
17 ... Inflator,
18 ... body part,
18a ... (upper part of body part),
18b ... outer peripheral surface,
19 ... Gas outlet,
22, 22F ... case,
24 ... insertion hole,
40, 40E ... Retainer,
41 ... presser part,
45, 45E ... vertical wall,
47, 47E, 47F ... capture member,
48, 48E, 48F ... opposing wall,
49, 49A, 49B, 49C, 49D, 49F ... General facing surface,
50, 50E ... opening,
51 (51C, 51L, 51R), 51F, 61, 71, 81, 81A, 91 (91C, 91L, 91R) ... capture recess,
52, 62, 72, 82, 92 ... inner surface,
54, 64, 74, 84, 94 ... bottom,
55, 65, 75, 85, 95 ... facing area,
56, 66, 76, 86, 96 ... outer peripheral edge,
96a ... (on the outer peripheral edge on the side away from the nearby corner),
96b ... (on the outer peripheral edge on the corner side in the vicinity),
CN ... corner of retainer,
EC ... central axis (of gas outlet)
IC: Axis (of the main unit),
G ... expansion gas,
S ... residue,
M1, M2, M3 ... airbag devices.

Claims (7)

An airbag having an inflow opening for an inflation gas;
An inflator having a columnar main body formed by disposing a plurality of gas discharge ports for discharging inflation gas along the circumferential direction of the outer peripheral surface on the upper side;
A case for storing and holding the folded airbag;
An annular retainer having a presser portion that is attached to the case by pressing a peripheral edge of the inflow opening of the airbag;
Configured with
The inflator is inserted into the airbag through the inflow opening and the insertion hole provided in the case, and is held by the case via the inflow opening and the insertion hole provided in the case. With
A trapping member capable of trapping residues contained in the inflation gas discharged from the gas discharge port is disposed around the portion of the main body portion that is inserted into the airbag. An air bag device,
The capture member is
An opposing wall disposed around the gas discharge port of the main body portion so as to be opened along the upper and lower directions with the upper side opened.
Indented from the general facing surface facing the main body portion of the facing wall portion so as to be separated from the main body portion, and a residue of the expansion gas discharged from each gas discharge port is attached to the recessed inner surface. A catching recess capable of catching the residue;
Configured with
Each of the trapping recesses is independent from each other for each of the corresponding gas discharge ports, and an opening through which the expansion gas immediately after discharge discharged from the corresponding gas discharge port can flow into the inner surface side. And an airbag device that is recessed from the general facing surface of the periphery.   Each of the trapping recesses is opposed to a portion that intersects the central axis of the corresponding gas discharge port, in the vicinity of the bottom that is most deeply recessed from the general facing surface, and facing substantially orthogonally to the central axis. The airbag device according to claim 1, wherein the airbag device is formed to be an area.   The inflating gas flowing in such a manner that the concave inner surface of each of the catching recesses comes into contact with the outer peripheral edge in the vicinity of the general facing surface is directed to the bottom side of the capturing recess that is most deeply recessed from the general facing surface. The entire circumference of the outer peripheral edge in the vicinity of the general facing surface is formed as a curved surface that narrows the inner diameter dimension toward the bottom side of the catching recess so as to be reflected. 2. The airbag device according to 2.   The airbag apparatus according to claim 3, wherein the concave inner surface of each of the catching recesses is formed as a substantially hemispherical curved surface. The retainer includes a vertical wall portion extending upward from an outer peripheral edge of the presser portion,
The air according to any one of claims 1 to 4, wherein the vertical wall portion includes the opposing wall portion and each of the capturing concave portions as the capturing member. Bag device. As the configuration in which the main body portion of the inflator is formed in a columnar shape, and the inflation gas discharged from each gas discharge port is discharged radially from the axis of the main body portion,
The vertical wall portion serving as the capturing member is disposed in the vicinity of a portion where the gas discharge port of the main body portion is disposed as a substantially rectangular tube shape,
The catching recesses located in the vicinity of each corner of the four corners in the substantially rectangular tube shape of the vertical wall part,
It is possible to prevent the expansion gas that is directed from the general facing surface in the capturing concave portion to the most recessed bottom portion from interfering with the general facing surface in the vicinity of the capturing concave portion.
The edge of the outer peripheral edge on the side away from the nearby corner is shifted to the side away from the bottom so that the distance away from the bottom is longer than the edge of the outer peripheral edge on the nearby corner. The airbag device according to claim 5, wherein the airbag device is formed. The case is made of sheet metal,
The airbag device according to any one of claims 1 to 4, wherein the capturing member is formed by cutting and raising a portion where the insertion hole is formed in the case.

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