JP2015071395A - Disc-shaped gas generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately hold an igniter while reducing a cost.SOLUTION: A disc-shaped gas generator 100 has a base plate 1 and an under plate 3. The base plate 1 has a generally circular projecting portion 11 which is integrally equipped with a first flat plate portion 13, and a generally cylindrical outer cylinder portion 15 for supporting a radial outer peripheral end of the first flat plate portion 13, by press molding; and an igniter attaching portion 90 which is equipped with a second flat plate 14, a generally cylindrical inner cylinder portion 17 extending from a radial inner peripheral end of the second flat plate portion 14 to an axial direction the other side, and an abutting portion 19 provided so as to project out from the axial direction the other side end portion of the inner cylinder portion 17 to radially inside, by press-molding, and has a smaller diameter than the circular projecting portion 11. The second flat plate portion 14 of the igniter attaching portion 90 is fixed on a lower side of the first flat plate portion 13 of the circular projecting portion 11, thereby positioning an igniter 9 from radially outside with the abutting portion 19 integrally provided on the igniter attaching portion 90.

Description

  The present invention relates to a disk-type gas generator that generates gas for inflating an airbag.

  Conventionally, a so-called disk-type gas generator that generates gas for inflating an airbag is known (see, for example, Patent Document 1). In this prior art, when the collision detection device arranged in the vehicle detects a collision, the igniter is ignited by the detection signal, and the gas generating agent is ignited. High-pressure gas is generated by the combustion of the gas generating agent and supplied to the airbag. Further, in the gas generator according to this prior art, it is formed between the first outer portion (lower lid) on one axial side (lower side) and the second outer portion (upper lid) on the other axial side (upper side). The gas generating agent is stored in the internal space. An inner cylinder portion (inner cylinder portion) that rises from the flat plate portion (bottom plate) of the first outer portion toward the other side (upper side) in the axial direction is provided, and the igniter is provided inside the inner cylinder portion. ing. The igniter is caulked and fixed by a claw provided at the upper end of the inner cylinder.

  Further, as another structure of the disk type gas generator as described above, there is a conventional technique described in Patent Document 2. In this conventional gas generator, a protruding portion (inward flange portion) protrudes radially inward from an axially intermediate portion of an inner cylindrical portion (boss portion) rising from a flat plate portion (flange portion) of the first outer portion. Is provided. And the igniter is hold | maintained by this protrusion part.

Japanese Patent No. 4278843 JP 2001-38443 A

  In the prior art disclosed in Patent Document 1, an igniter is provided on the inner side of the inner cylinder part from the first outer part toward the other side (upper side) in the axial direction, and the igniter is caulked by a claw part provided at the upper end of the inner cylinder part. And fixed. In this case, even when the inner cylinder portion is integrally formed by press molding or the like at the time of manufacturing the first outer portion, a cutting process is separately required in order to form the above-described thin claws for caulking. Become. Therefore, the manufacturing process becomes complicated and costs increase.

  On the other hand, the prior art of Patent Document 2 proposes an inner cylinder part forming step for producing a structure in which a flat plate part (bottom plate) and an inner cylinder part (inner cylinder part) of the first outer part are integrated. is there. In order to obtain a final molded product only by this process, it is difficult to obtain a thin molding of the claw portion provided at the upper end of the inner cylinder part, a dimension for assembling the igniter and the inner cylinder part in an airtight manner, and shape accuracy. Therefore, cutting is necessary after this step.

  An object of the present invention is to provide a disk-type gas generator capable of holding an igniter with high accuracy while reducing costs.

  In order to achieve the above object, a first invention is a disk-type gas generator having a substantially disk shape, which is provided on one side in the axial direction and has a first outer portion for mounting at least one igniter. A second outer portion for storing a gas generating agent in an internal space provided between the first outer portion and the first outer portion, the first outer portion being The first flat plate portion and the substantially cylindrical outer tube portion that supports the radially outer peripheral end of the first flat plate portion are integrally formed by press molding so as to protrude to one side in the axial direction for mounting the igniter. A substantially circular circular protrusion, a second flat plate portion, a substantially cylindrical inner tube portion extending from the radially inner peripheral end of the second flat plate portion to the other axial side, and the inner tube A contact portion provided so as to project radially inward from the other axial end of the portion. An igniter mounting portion having a diameter smaller than that of the circular protruding portion, which is integrally provided by molding, and the second flat plate portion of the igniter mounting portion is the first flat plate portion of the circular protruding portion. The igniter is positioned from the outside in the radial direction by the abutment portion provided integrally with the igniter mounting portion, and is held by axial pressure. To do.

  The disc-type gas generator according to the first invention of the present application has a first outer portion and a second outer portion. The first outer portion includes a circular protrusion and an igniter mounting portion fixed to the circular protrusion and to which an igniter is attached. The circular protruding portion includes a first flat plate portion and an outer cylinder portion, and the igniter mounting portion includes a second flat plate portion, an inner cylinder portion, and an abutting portion. The igniter is positioned from the outside in the radial direction by the contact portion and is held by the axial pressure.

  At this time, in this invention, the said circular protrusion part and an igniter attachment part are each integrally formed by press molding. That is, in the circular projecting portion, the first flat plate portion and the outer cylinder portion connected to the radially outer peripheral end of the first flat plate portion are all formed by press molding from one base material. Furthermore, in the igniter mounting portion, the second flat plate portion fixed to the other axial side of the first flat plate portion, and the inner cylindrical portion extending from the radially inner peripheral end of the second flat plate portion to the other axial side. The abutting portion that protrudes radially inward from the other axial end of the inner cylinder portion is formed by press molding from one base material. As a result, the process can be simplified and the cost can be reduced as compared with the conventional structure that requires cutting for finishing.

  Further, in the conventional structure in which the projecting portion is provided radially inward from the axially intermediate portion of the inner cylinder portion to hold the igniter, the inner side of the inner cylinder portion is radially inward during the plastic flow of the base material by press molding. It is difficult to make the material flow, and the protrusion cannot be constructed with high accuracy. In contrast, in the first invention of the present application, the contact portion is provided so as to protrude radially inward from the other axial end of the inner cylinder portion, and the inner cylinder portion has a so-called bottomed structure. Thereby, the material can be plastically flowed inward in the radial direction with high accuracy when the contact portion corresponding to the bottom portion is formed. As a result, the contact portion can be formed with high accuracy, and the igniter can be reliably held.

  As described above, in the present invention, the igniter can be held with high accuracy while reducing the cost.

  According to the present invention, it is possible to hold the igniter with high accuracy while reducing the cost.

It is sectional drawing which shows an example of the gas generator of 1st Embodiment of this invention. It is the top view of the baseplate with which a gas generator is equipped, and the cross-sectional view by the II-II cross section in Fig.2 (a). It is a principal part expanded sectional view of FIG. 1, and the expanded sectional view showing the state by which the connector was inserted at the time of use of a gas generator. FIG. 4 is a detailed cross-sectional view showing the extracted base plate in the II-II cross section in FIG. 2A and a detailed cross-sectional view in the IV-IV cross section in FIG. It is the top view showing the detailed structure of a fixing member, and the sectional side view showing the detailed structure of a fixing member. It is explanatory drawing explaining the process of forming a baseplate by press molding. It is explanatory drawing explaining the process of forming a baseplate by press molding. It is the top view of the base plate with which a gas generator is provided in the modification which provides one igniter, and the cross-sectional view by the VIII-VIII cross section in Fig.8 (a). It is a transverse cross section in the section equivalent to the II-II section in Drawing 2 (a) showing the important section structure of the gas generator of a 2nd embodiment of the present invention. FIG. 10 is an enlarged view of a portion X in FIG. 9. It is a disassembled perspective view of the principal part structure of the gas generator of 2nd Embodiment of this invention. It is explanatory drawing explaining the process of forming an igniter attachment part by press molding.

  Embodiments of the present invention will be described below with reference to the drawings.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing an example of a gas generator according to a first embodiment of the present invention.

  In FIG. 1, a gas generator 100 is a so-called disk-type gas generator having a substantially disk shape as a whole. The gas generator 100 includes a base plate 1 (first outer portion) and an under plate 3 (second outer portion). The base plate 1 and the under plate 3 constitute a housing 7 for the gas generator 100.

  The base plate 1 is provided on one side (upper side in FIG. 1) of the gas generator 100 in the axial direction (up and down direction in FIG. 1). The under plate 3 is provided on the other axial side of the gas generator 100 (the lower side in FIG. 1). The under plate 3 forms an internal space 5 between the base plate 1 and the under plate 3. In the internal space 5, a plurality of known gas generating agents T are stored.

  The base plate 1 is provided with a large number of gas discharge holes 51 (not shown in each drawing other than FIG. 1). A cooling / filter member 53 is provided inside the housing 7 composed of the base plate 1 and the under plate 3. The gas generating agent T is loaded inside the cooling / filter member 53. On the outer periphery of the cooling / filter member 53, a punching metal (not shown) having a large number of holes on the outer periphery is arranged. This punching metal prevents the cooling / filter member 53 from being crushed by the gas pressure generated when the gas generating agent T burns, and the gas generated by the gas generating agent T burning is reliably discharged to the gas discharge port 51. To release from. In addition, although illustration is abbreviate | omitted for complexity prevention in FIG. 1, in the said gas generator 100, the viewpoint of the moisture prevention of the said gas generating agent T is provided (it mentions later). The illustration is also omitted in FIGS. 2 and 8.

  FIG. 2A is a top view of the base plate 1 provided in the gas generator. FIG. 2B is a cross-sectional view taken along the line II-II in FIG. FIG. 3A is an enlarged cross-sectional view of a main part of FIG. 1, and FIG. 3B is an enlarged cross-sectional view showing a state where a connector is inserted when the gas generator 100 is used. 4 (a) is a detailed sectional view showing the base plate 1 extracted from the section II-II in FIG. 2 (a), and FIG. 4 (b) is a sectional view in FIG. 2 (a). It is a detailed sectional view in a IV-IV section.

  At least one (two in this example) igniters 9 are attached to the base plate 1. As shown in FIG. 1, FIG. 2 (a), FIG. 2 (b), FIG. 3 (a), FIG. 3 (b), FIG. 4 (a), and FIG. In order to attach the igniter 9, it is on one side in the above-mentioned axial direction (the upper side in FIGS. 1, 2B, 3A and 3B, hereinafter abbreviated as “upper side in each figure” as appropriate). A substantially circular bowl-like circular protrusion 11 provided so as to protrude is provided. In addition, the base plate 1 is provided with a flange 12 that extends outward from the circular protrusion 11 and to which an airbag module (not shown) is attached.

  The circular protruding portion 11 is formed by integrally forming a first plate portion 13 having a substantially disc shape, an outer cylindrical portion 15 having a substantially cylindrical shape, an inner cylindrical portion 17 having a substantially cylindrical shape, and a contact portion 19 by press molding. In preparation. The outer cylinder portion 15 supports the radially outer peripheral end of the first flat plate portion 13. The inner cylinder part 17 is the other side in the axial direction from the radially inner peripheral end of the first flat plate part 13 (the lower side in FIGS. 1, 2B, 3A, and 3B. Hereinafter, as appropriate. (Abbreviated as “lower side in each figure”). The contact portion 19 is provided so as to protrude radially inward from the end portion on the other axial side (the lower side in each figure) of the inner cylinder portion 17. The contact portion 19 holds the igniter 9 from the outside in the radial direction.

  The igniter 9 includes an igniter main body 21, a supported portion 23 formed by a resin mold, and an electrode portion 25.

  The igniter body 21 is positioned on the other side in the axial direction (lower side in each drawing) of the contact portion 19 in the above holding state by the contact portion 19 and ignites the gas generating agent T.

  The electrode portion 25 extends from the igniter body 21 through the supported portion 23 to the one side in the axial direction (upper side in each drawing), and projects into the radially inner space of the inner cylinder portion 17.

  The supported portion 23 is positioned on one axial side (upper side in each drawing) of the igniter main body 21 in the holding state, and is supported by being contacted from the radially outer side by the contact portion 19. At this time, a fixing member 31 (sleeve) is provided on the outer peripheral side of the igniter 9. The fixing member 31 is fixed to the igniter 9 contact part 19 or the inner cylinder part 17 in a state of being held from the radially outer side by the contact part 19 as described above.

  FIG. 5A is a top view illustrating the detailed structure of the fixing member 31, and FIG. 5B is a side sectional view illustrating the detailed structure of the fixing member 31. As shown in FIGS. 5 (a), 5 (b), 3 (a), and 3 (b), the fixing member 31 is on the one side in the axial direction (upper side in each figure) in the holding state. From the above to the other side in the axial direction (the lower side in each figure), a stepped cylindrical shape having a large diameter portion 31a, a small diameter portion 31b, and a locking portion 31c in order.

  The large diameter portion 31 a has the largest outer diameter, and the inner periphery is in contact with the outer periphery of the inner cylinder portion 17. The small diameter portion 31 b has an outer diameter slightly smaller than that of the large diameter portion 31 a, and the inner periphery is in contact with the outer periphery of the large diameter portion 23 a of the supported portion 23. Note that an O-ring is provided between the upper tapered portion 23b located on the upper side of each supported portion in the drawings and the small-diameter portion 31b to provide a seal.

  The engaging part 31c located on the lower side in each figure from the small diameter part 31 is in contact with the outer periphery of the lower tapered part 23c of the supported part. That is, when the igniter 9 is attached to the circular protrusion 11, the contact portion of the circular protrusion 11 integrally formed (details will be described later) together with the first flat plate portion 13, the outer cylinder portion 15, and the inner cylinder portion 17. The electrode portion 25 is inserted from below through the 19 through holes 19A (see FIGS. 3A and 3B). When the upper tapered portion 23b of the supported portion 23 comes into contact with the positioning tapered portion 19B provided on the lower side of the through hole 19A of the contact portion 19 in the drawings, An O-ring 33 is provided in a lower portion in each figure than the contact portion of the upper taper portion 23b.

  Thus, the fixing member 31 is covered from below so that the igniter 9 in the positioning state with respect to the contact portion 19 is covered with the igniter 9. Thereby, as described above, the inner periphery of the large-diameter portion 31 a of the fixing member 31 is in contact with the outer periphery of the inner cylinder portion 17, and the inner periphery of the small-diameter portion 31 b is in contact with the outer periphery of the large-diameter portion 23 a of the supported portion 23. It will be in the state. In this state, the lower end portion of the small-diameter portion 31b of the fixing member 31 is brought into contact with the lower tapered portion 23c of the supported portion 23 and the locking portion 31c is brought into contact with the lower tapered portion 23c. The diameter portion 31 a is press-fitted into the inner cylinder portion 17. At this time, the outer peripheral diameter of the inner cylindrical portion 17 is configured to be larger than the diameter of the large-diameter portion 31 a of the fixing member 31, whereby the fixing member 31 is firmly fixed to the inner cylindrical portion 17. In other words, the axial press-fitting of the fixing member 31 into the inner cylindrical portion 17 maintains the airtightness between the internal space 5 of the gas generator 100 and the outside through the packing described above. By such a method, the fixing member 31 and the inner cylinder part 17 are fixed without applying a shocking force to the gas generator 100.

  One igniter 9 is provided with two electrode portions 25 (see FIGS. 1 and 2B). After the igniter 9 is attached to the circular protrusion 11 by the fixing member 31 as described above, the two electrode portions 25 and 25 protrude upward in the drawings on the radial inner side of the inner cylinder portion 19. It becomes. In order to short-circuit these two electrode portions 25, 25, a short cylindrical ring member 41 (shunt ring) having a substantially cylindrical shape with a flange is provided.

  The short-circuit ring member 41 includes a cylindrical portion 41a in which an axial through-hole 41b is formed in the inner peripheral portion, a flange portion 41c located on the upper side in each drawing relative to the cylindrical portion 41a, and in each drawing than the cylindrical portion 41a. And a bottom 41d located on the lower side. The cylindrical portion 41a is provided with a short-circuit fitting 41e so that the radially inner tip protrudes into the through hole 41b. The bottom 41d is provided with a through hole 41f. After the igniter 9 is fixed to the contact portion 19 as described above, the short-circuit ring member 41 is attached to the inner cylinder portion 17.

  That is, while the two electrode portions 25, 25 are inserted from below into the through hole 41b of the cylindrical portion 41a through the through hole 41f of the bottom portion 41d, FIGS. 3 (a) and 3 (b). The short-circuit fitting 41 is inserted into the inner cylinder portion 17 from the upper side inside. At this time, positioning protrusions (not shown) protruding in the radial direction are provided at appropriate locations (for example, two locations) in the circumferential direction below the flange portion 41 of the short-circuit fitting 41. Correspondingly, the inner cylinder portion 17 is provided with two engagement holes 17a and 17a (see FIGS. 2 and 4B) for engaging the protrusions. When the flange portion 41c is brought into substantially contact with the first flat plate portion 13 by the insertion of the short-circuit fitting 41, the two protrusions are engaged with the engagement holes 17a and 17a. 41 is fixed in the inner cylinder part 17 while being positioned in the circumferential direction. In this fixed state, as shown in FIG. 3A, the tip of the short-circuit fitting 41e is in contact with the two electrode portions 25a and 25a, respectively. Thereby, these two electrode parts 25a and 25a are electrically short-circuited.

  On the other hand, when the gas generator 100 of this embodiment is used, a connector 150 (outlet) is connected to the electrode portions 25a and 25a in order to energize the igniter 9. That is, as shown in FIG. 3B, the connector 150 includes a base portion 150a and a terminal portion 150b provided so as to protrude downward from the base portion 150a in each drawing. The terminal portion 150b includes two terminal holes 150c and 150c provided corresponding to the electrode portions 25a and 25a, respectively.

  When the gas generator 100 is used, the connector 150 is attached from the upper side in each drawing of the short-circuit ring member 41 attached to the inner cylinder portion 17 as shown in FIG. That is, while the electrode portions 25a and 25a of the igniter 9 are inserted and received in the two terminal holes 150c and 150c of the connector 150, respectively, the terminal portion 150b is connected to the through hole 41b and the bottom portion 41d of the cylindrical portion 41a. Is inserted into the through hole 41f.

  At this time, a pressing protrusion 150d is provided on the short-circuit fitting 41e side (left side in FIG. 3B) of the terminal portion 150b. When the terminal portion 150b is inserted into the through hole 41b, the pressing protrusion 150d presses the short-circuit fitting 41e as shown in FIG. As a result, the short-circuit fitting 41e that has been in contact with the two electrode portions 25a and 25a as described above is separated from each electrode portion 25a, and the short-circuit is eliminated. Each terminal hole 150c is provided with a conductive wire through which an ignition control signal from a vehicle control device (not shown) is guided, and the electrode portion 25a is inserted into the terminal hole 150c as described above. Thus, each electrode portion 25a is electrically connected to the corresponding conductive line.

  Note that the terminal portion 150b of the connector 150 is provided with locking portions (not shown) protruding in the radial direction at appropriate plural locations (for example, two locations) in the circumferential direction. Correspondingly, the inner cylinder portion 17 is provided with a locked groove 17b (see FIGS. 2A, 2B, 4A, and 4B). . After the terminal portion 150b is inserted into the through hole 41b as described above, the locking portion of the connector 150 penetrates into the locked groove 17b and is locked. Thereby, the terminal part 150b of the connector 150 is fixed to the inner cylinder part 17 through the short-circuit line tool member 41, and the igniter 9 can be controlled to be ignited by the ignition control signal from the control device.

  That is, when the collision detection device disposed in the vehicle detects a vehicle collision, the control device outputs the ignition control signal based on the detection signal. The ignition control signal is input to the electrode portion 25 of the igniter 9 through the connector 150, and the igniter body 21 is ignited thereby. The gas generating agent T is ignited by the ignition flame by the ignition, and the generation of the high pressure gas is started by the combustion of the gas generating agent T. Thereafter, when the gas pressure in the housing 4 rises and reaches a predetermined pressure, a high-pressure gas is ejected from the gas discharge port 51 to inflate and deploy an airbag (not shown).

  The slag generated during the combustion of the gas generating agent T is cooled and collected in the process of passing through the cooling / filter member 53, and is supplied to the airbag as clean gas. As the gas generating agent T that can be used at this time, a nitrogen-containing organic compound such as a tetrazole compound, a triazole compound, an azodicarboninamide compound, or a guanidine compound is used as a fuel. There is a gas generating agent obtained by adding and mixing an oxidizing agent.

  Next, a method for forming the base plate 1, which is a main part of the present embodiment, will be described. FIG. 6A to FIG. 6F and FIG. 7 are explanatory views for explaining a process of forming the base plate 1 by press molding. As described above, in the base plate 1, the two inner cylinder portions 17, 17 are formed on the circular protrusion 11 in order to provide the two igniters 9, 9. Therefore, in FIG. 6A to FIG. 6F, a description will be given by illustrating the formation of one inner cylinder portion 17.

  First, a predetermined material (for example, NSH780 or the like) having a predetermined thickness (for example, 2.3 mm thickness) that is a base material of the base plate 1 is cut into a substantially circular flat plate shape. The material Mo cut out at this time has a circular shape with an outer diameter Do (for example, Do = 125 [mm]), as shown in FIGS. 6 (a) and 6 (b). For this circular material Mo, as shown on the right side of FIG. 6 (a), using a mold die H and a mold punch P having an outer diameter d slightly smaller than the inner diameter of the mold die H, Press molding is performed by a known method, and a drawing process (primary drawing process) is performed. By this primary drawing step, the blank diameter d1 of the processed material M1 shown in FIG. 6C is about 60% of the outer diameter Do (d1 = about 75 [mm] according to the above example). Squeezed.

  Thereafter, in the same manner as described above, drawing processing (secondary drawing step → third drawing step →...) Is performed while sequentially reducing the inner diameter of the mold die H and the outer diameter of the mold punch P. Thereby, the blank diameter d2 of the material M2 after the secondary drawing process shown in FIG. 6D is reduced to about 80% of the blank diameter d1 (d2 = about 60 [mm] according to the above example). The blank diameter d3 of the material M3 after the third drawing process is reduced to about 80% of the blank diameter d2 (d3 = 48 [mm] according to the above example) (not shown).

  Hereinafter, similarly to the above, the material Mi after the i-th drawing step having a blank diameter Di corresponding to the number of repetitions is sequentially repeated until the i-th drawing step (i = an appropriate integer of 4 or more). Is obtained (see FIG. 6 (e)).

  Thereafter, the outer diameter of the material Mi is subjected to outer diameter drawing (to realize a bowl-like shape like the circular protrusion 11) and detailed molding of each part (drawing and ironing). (See material M ′ in FIG. 6F). Thereafter, the material M ′ is further subjected to drilling processing for forming the through-holes 19A of the abutting portion 19 and processing of the portions serving as the engagement holes 17a and the locked grooves 17b. Thereby, the circular protrusion part 11 provided with the two cylindrical parts 17 and 17, the outer cylinder part 15, and the 1st flat plate part 13 as shown in FIG. 7 is completed.

  As described above, in the gas generator 1 according to the first embodiment, the circular protrusion 11 is integrally formed by press molding. That is, the 1st flat plate part 13, the outer cylinder part 15, the inner cylinder part 17, and the contact part 19 are comprised by the press molding from one base material Mo altogether. Thereby, compared with the conventional structure (structure described in Japanese Patent No. 4278843) that requires cutting for finishing, the process can be simplified and the cost can be reduced.

  Further, for example, in a conventional structure (Japanese Patent Laid-Open No. 2001-38443) in which a projecting portion is provided radially inward from an axially intermediate portion of the inner cylinder portion, the plastic material flow of the base material by press molding Sometimes, it is difficult to flow the material radially inward from the middle of the inner cylindrical portion, and the protruding portion cannot be configured with high accuracy. On the other hand, in the first embodiment, the abutting portion 19 is provided so as to protrude radially inward from the other axial end (the lower side in each drawing) of the inner cylindrical portion 17, and the inner cylindrical portion 17 is so-called. A bottomed structure is obtained (see, for example, FIG. 7). Thereby, in the drawing process of the press molding, the material can be plastically flowed inward in the radial direction with high accuracy when the contact portion 19 corresponding to the bottom portion is formed. As a result, the contact portion 19 can be formed with high accuracy, and the igniter 9 can be reliably held.

  As a result, in the gas generator 1 of the first embodiment, the igniter 9 can be held with high accuracy while reducing the cost.

  In the first embodiment, in particular, the contact portion 19 of the circular protrusion 11 has a structure in which the supported portion 23 of the igniter 9 located between the igniter main body 21 and the electrode portion 25 is in contact with and supported. is there. Thereby, the igniter 9 can be positioned and held in a state where energization ignition is possible.

  In the first embodiment, in particular, the igniter 9 held by the contact portion 19 from the radially outer side is fixed to the contact portion 19 or the inner cylinder portion 17 by the fixing member 31. Thereby, the igniter 9 held by the contact portion 19 of the circular protrusion 11 can be securely fixed firmly.

  In the above, the case where the two igniters 9 and 9 are provided on the base plate 1 by forming the two inner cylindrical portions 17 and 17 on the circular protrusion 11 has been described as an example, but the present invention is not limited thereto. Absent. That is, as shown in FIGS. 8 (a) and 8 (b) corresponding to FIGS. 2 (a) and 2 (b), respectively, a single inner cylinder portion 17 is formed in the circular protrusion 11 to form the base plate. One igniter 9 may be provided in one. In this case, the same effect as described above can be obtained.

  A second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted or simplified as appropriate.

  As shown in FIGS. 9-11, in this embodiment, the circular protrusion part 11 of the baseplate 1 is equipped with the 1st flat plate part 13 and the outer cylinder part 15 integrally by press molding. On the other hand, an igniter mounting portion 90 having a smaller diameter than the circular protrusion 11 is provided below the circular protrusion 11.

  The igniter mounting portion 90 includes a second flat plate portion 14, a substantially cylindrical inner cylinder portion 17 extending downward from the radially inner peripheral end of the second flat plate portion 14, and a lower side end portion of the inner cylinder portion 17. An abutting portion 19 that protrudes radially inward is integrally provided by press molding (see also FIGS. 12B and 12C described later). That is, the second flat plate portion 14 of the igniter mounting portion 90 is fixed to the lower side of the first flat plate portion 13 of the circular protrusion 11 (in this example, fixed by welding W). Thus, the igniter 19 is positioned and held from the outside in the radial direction by the contact portion 19 provided integrally with the igniter mounting portion 90.

  The igniter mounting portion 90 is formed by press molding in the same manner as described with reference to FIG. 6 for the circular protrusion 11 in the first embodiment. That is, although detailed illustration and description are omitted, a predetermined material having a predetermined thickness, which is a base material of the igniter mounting portion 90, is cut into a substantially oval flat plate shape (see FIG. 12A). For the material No. cut out at this time, press molding is performed by a known method using an appropriate molding die and a molding die punch having an outer diameter slightly smaller than the inner diameter of the molding die. Apply processing. That is, as described in the first embodiment, the drawing process is performed while the inner diameter of the mold die and the outer diameter of the mold punch are sequentially reduced (primary drawing process → secondary drawing process → third drawing process → ) Thereby, the material Ni (not shown) after the i-th throttling step having a blank diameter corresponding to the number of repetitions is sequentially repeated until the i-th throttling step (i = an appropriate integer of 4 or more). can get.

  Thereafter, the outer diameter of the material Mi is subjected to an outer diameter drawing process (for realizing the shape of the igniter mounting portion 90), and detailed molding of each part (drawing process and ironing process) is performed. Done. Thereafter, the processed material is further drilled to form the through hole 19A of the contact portion 19 described above, the engagement hole 17a (not shown in FIGS. 9 to 12), and the locked groove 17b. Processing of the portion (see FIGS. 9 and 12B) is performed. Thereby, the igniter mounting part 90 provided with the two cylindrical parts 17 and 17 and the 2nd flat plate part 14 as shown in FIG.12 (b) and FIG.12 (c) is completed. The two through holes 19A and 19A of the igniter mounting portion 90 after molding are obtained from the separation distance Lo of the portion corresponding to the two through holes 19A and 19A in the base material No by the drawing process as described above. The distance becomes smaller toward the separation distance L.

  Also in the present embodiment configured as described above, the same effects as in the first embodiment are obtained. That is, in 2nd Embodiment, the circular protrusion part 11 and the said igniter attachment part 90 are each integrally formed by press molding. That is, in the circular protrusion 11, the first flat plate portion 13 and the outer cylinder portion 15 are all formed by press molding from one base material Mo, and in the igniter mounting portion 90, the inner cylinder portion 17 and the contact portion 19. Are all formed by press molding from one base material No. As a result, the process can be simplified and the cost can be reduced as compared with the conventional structure that requires cutting for finishing.

  Further, in the second embodiment, in the igniter mounting portion 90, as in the first embodiment, the contact portion 19 is provided to protrude radially inward from the lower end portion of the inner tube portion 17, and the inner tube portion 17 has a so-called bottomed structure (see, for example, FIG. 10). Thereby, in the drawing process of the press molding, the material can be plastically flowed inward in the radial direction with high accuracy when the contact portion 19 corresponding to the bottom portion is formed. As a result, the contact portion 19 can be formed with high accuracy, and the igniter 9 can be reliably held.

  As a result, in the gas generator 1 according to the second embodiment, the igniter 9 can be held with high accuracy while reducing the cost, as in the first embodiment.

  Moreover, in this embodiment, the igniter mounting part 90 provided with the 2nd flat plate part 14, the inner cylinder part 17, and the contact part 19 is used as the circular protrusion part provided with the outer cylinder part 15 and the 1st flat plate part 13. 11 is configured as a separate member. Thereby, when the circular protrusion part 11 provided with all the outer cylinder part 15, the 1st flat plate part 13, the inner cylinder part 17, and the contact part 19 is comprised integrally by press molding like the said 1st Embodiment. In comparison, the difficulty of processing is reduced. As a result, manufacturability can be improved.

  In the first embodiment, as described above, the circular protruding portion 11 including all of the outer cylindrical portion 15, the first flat plate portion 13, the inner cylindrical portion 17, and the abutting portion 19 is integrated from one base material Mo. Since the molding is performed, the contact portion 19 and the inner cylinder portion 17 are also formed to have substantially the same thickness as the outer cylinder portion 15 and the first flat plate portion 13. However, during operation of the gas generator 100, due to the shape of the base plate 1, a tensile force acts on the first flat plate portion 13 due to the internal pressure of the internal space 5, while the inner cylinder portion 17 and the contact portion 19 are compressed. Force acts. As a result, the inner cylinder part 17 and the contact part 19 do not need to be as strong as the first flat plate part 13. Should be thin and configurable.

  In the second embodiment, the igniter mounting portion 90 is configured as a separate member from the circular protrusion 11 as described above. As a result, the inner cylinder portion 17 and the abutting portion 19 of the igniter mounting portion 90 can be configured to be thinner than the first flat plate portion 13 of the circular protruding portion 11, and the weight can be reduced accordingly.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

  In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

1 Base plate (1st outline)
3 Under plate (2nd outline)
DESCRIPTION OF SYMBOLS 9 Igniter 11 Circular protrusion part 13 1st flat plate part 14 2nd flat plate part 15 Outer cylinder part 17 Inner cylinder part 19 Contact part 21 Igniter main body 23 Supported part 25 Electrode part 31 Fixing member 90 Igniter attachment part T Gas Generating agent

Claims (1)

A disk-type gas generator having a substantially disk shape,
A first outer part provided on one side in the axial direction for attaching at least one igniter;
A second outer portion that is provided on the other side in the axial direction and stores a gas generating agent in an internal space formed between the first outer portion and the first outer portion;
Have
The first outer portion is
A first flat plate portion and a substantially cylindrical outer tube portion that supports a radially outer peripheral end of the first flat plate portion are provided by press molding so as to protrude to one side in the axial direction for mounting the igniter. A substantially circular circular protrusion provided integrally;
The second flat plate portion, the substantially cylindrical inner cylinder portion extending from the radially inner peripheral end of the second flat plate portion to the other axial side, and the radial direction from the other axial end portion of the inner cylindrical portion An igniter mounting portion having a smaller diameter than the circular protruding portion, integrally provided by press molding, with a contact portion provided protruding inward;
Have
The abutment portion provided integrally with the igniter mounting portion by fixing the second flat plate portion of the igniter mounting portion to the other axial side of the first flat plate portion of the circular protrusion. Thus, the igniter is positioned from the outside in the radial direction and is held by the axial pressure.

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