JP6584830B2 - Gas generator - Google Patents

Description

  The present invention relates to a gas generator incorporated in an airbag device as an occupant protection device mounted on an automobile or the like, and more particularly to a so-called cylinder type gas generator having a long cylindrical outer shape.

  2. Description of the Related Art Conventionally, airbag devices, which are occupant protection devices, have been widely used from the viewpoint of protecting occupants such as automobiles. An airbag device is installed in a vehicle or the like for the purpose of protecting an occupant from an impact caused by a vehicle or the like, and is an airbag that is deployed by instantly inflating and deploying the airbag at the time of a vehicle or the like collision. It is intended to catch the passenger's body. The gas generator is a device that is incorporated in the airbag device and inflates and deploys the airbag by instantaneously generating gas when a vehicle or the like collides.

  Gas generators of various configurations exist based on specifications such as installation positions and outputs with respect to vehicles and the like. One of them is a gas generator having a structure called “cylinder type”. The cylinder type gas generator has a long cylindrical shape, and is suitably incorporated in a side airbag device, a curtain airbag device, a knee airbag device, or the like. In addition, when incorporated in these airbags, a faster operation is required as compared with the case where the airbag is incorporated in a driver seat or passenger seat airbag.

  In addition, when a high temperature is generated in a vehicle fire or the like and this high temperature is transferred to the gas generating agent in the gas generator, most of the gas generating agent ignites and burns at a time, which is higher than the original desired pressure. Pressure gas may be generated. In order to prevent this, for example, as disclosed in Patent Document 1, an automatic ignition agent having a so-called automatic ignition function, which has an ignition temperature lower than that of the gas generating agent, is arranged in the ignition means. Even when heat is transferred from the gas discharge cylinder side, combustion is started before the gas generating agent, and combustion of the gas generating agent is started at a temperature lower than the ignition temperature of the gas generating agent in the housing. There is already known a long cylindrical gas generator in which the role of the ignition agent is sufficiently exhibited.

  Further, when the outer diameter of the housing is reduced, for example, a hollow cylindrical filter is arranged as in Patent Document 2, so that the gas generated in the combustion chamber can be smoothly discharged out of the housing while being small. Gas generators that can be used are known.

Utility Model No. 3137916 JP 2009-262593 A

  In the case of using a hollow cylindrical filter as in Patent Document 2, a structure that efficiently ignites the autoignition agent and smoothly discharges the combustion gas has not been studied.

  Therefore, the present invention is configured to have the function of the above-described gas generator, and is long and small, but by contacting the auto-igniting agent and the partition plate, the combustion gas can be smoothly produced even in the event of a fire. It aims at providing the gas generator of the structure which can be discharged | emitted.

The gas generator based on this invention is provided with the housing, the holder, the igniter, the filter, the autoignition agent, and the partition member. The housing includes a combustion chamber containing a gas generating agent that generates gas by combustion, is closed at both ends in the axial direction, and is provided with a gas outlet for ejecting the generated gas to the outside. It has a long cylindrical shape. The igniter is assembled at one end of the housing in the axial direction, and generates a flame for burning the gas generating agent by operating. The holder is attached to the housing in a state of being inserted into an opening end in the axial direction of the housing so as to face a space inside the housing, and extends in a direction parallel to the axial direction of the housing. Has an opening. The igniter is fixed to the holder. The filter is disposed in a filter chamber on the other end side of the housing and has a hollow cylindrical shape. The autoignition agent is on the other end side of the combustion chamber. The partition member partitions the gas generating agent and the automatic ignition agent, and the automatic ignition agent and the partition member are in contact with each other.

  In the gas generator according to the present invention, the combustion chamber has a cup body containing the gas generating agent, the partition member, and the automatic ignition agent therein, and the automatic ignition agent and the cup It is preferable that the body is in contact.

  In the gas generator according to the present invention, a part of the outer surface of the cup body is preferably in contact with the inner surface of the housing.

  In the gas generator according to the present invention, a through hole is preferably formed in the partition member.

  In the gas generator according to the present invention, it is preferable that a concave portion is formed at the bottom of the cup body, and the autoignition agent is included in the concave portion.

  In the gas generator based on the said invention, it is preferable to provide a weak part in the through-hole vicinity of the said partition member.

ADVANTAGE OF THE INVENTION According to this invention, it can be set as the gas generator of the structure which can discharge | emit combustion gas smoothly also at the time of a fire, when an automatic ignition agent and a partition member contact.

It is the schematic of the gas generator in Embodiment 1 of this invention. It is an expanded sectional view of the area | region I shown in FIG. It is the schematic of the gas generator in Embodiment 2 of this invention. It is an expanded sectional view of the area | region II shown in FIG. It is a perspective view of the partition member shown in FIG. It is sectional drawing of a cup-shaped modification. It is a perspective view of the modification of a partition member. It is an expanded sectional view after the operation | movement in Embodiment 2 (use of the partition member of FIG. 7) of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment described below exemplifies a case where the present invention is applied to a so-called cylinder type gas generator suitably incorporated in a side airbag device or the like.

  FIG. 1 is a schematic cross-sectional view showing the internal structure of a cylinder type gas generator in Embodiment 1 of the present invention. Hereinafter, the internal structure of the cylinder type gas generator in the present embodiment will be described with reference to FIG. 1 and FIG. 2 which is an enlarged sectional view.

As shown in FIG. 1, the cylinder type gas generator 1 </ b> A in the present embodiment has a long and substantially cylindrical outer shape, and includes a housing 10, a holder 20, and a closing member 30.
The housing 10 is composed of a long cylindrical member having openings formed at both ends in the axial direction. The holder 20 is fixed to the housing 10 so as to close the cylindrical portion of the housing 10. The holder 20 is formed of a cylindrical member having a hollow opening 21 extending in the same direction as the axial direction of the housing 10, and has an annular groove 23 for caulking and fixing described later at a predetermined position on the outer peripheral surface thereof. The annular groove 23 for caulking and fixing is formed on the outer peripheral surface of the holder 20 so as to extend in the circumferential direction.
The closing member 30 is made of a disk-shaped member having a predetermined thickness, and has an annular groove portion 32 for caulking and fixing, which will be described later, formed so as to extend in the circumferential direction on the peripheral surface thereof.

  The housing 10, the holder 20, and the closing member 30 may all be made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy, or a rolled steel plate represented by SPCE is pressed. A metal press-molded product formed into a bottomed cylindrical shape by processing, or a metal formed into a bottomed cylindrical shape by closing one of the end portions in the axial direction of an electric sewing tube represented by STKM You may be comprised with the following molded article. In particular, when the housing 10 is configured as a press-formed product of a rolled steel plate or a molded product of an electric resistance welded tube, the housing 10 can be easily and inexpensively compared with a case where a metal member such as stainless steel or steel is used. It can be formed and can be significantly reduced in weight.

The holder 20 is fixed to the housing so as to close one open end of the housing 10. Specifically, in a state where a part of the holder 20 is inserted into the opening end of the housing 10, the peripheral wall of the housing 10 corresponding to the annular groove 23 provided on the outer peripheral surface of the holder 20 is radially inward. The holder 20 is caulked and fixed to the housing 10 by reducing the diameter (caulking) and engaging with the annular groove 23. These caulking fixings are caulking fixings called eight-side caulking that uniformly reduce the diameter of the peripheral wall of the housing 10 toward the inside in the radial direction.
Further, an O-ring 28 is interposed in the annular groove 23. The space inside the housing 10 is hermetically sealed by caulking and fixing to the housing 10 after the O-ring 28 is disposed.

The closing member 30 is fixed to the housing 10 so as to close the other opening end of the housing 10. Specifically, in a state where the closing member 30 is inserted into the opening end of the housing 10, the peripheral wall of the housing 10 corresponding to the annular groove portion 32 provided on the peripheral surface of the closing member 30 is radially inward. The closing member 30 is caulked and fixed to the housing main body 10 by being reduced in diameter and engaged with the annular groove 32. Thereby, the other end portion of the housing 10 in the axial direction is constituted by the closing member 30.
Further, an O-ring 28 is interposed in the annular groove portion 32. The space inside the housing 10 is hermetically sealed by caulking and fixing to the housing 10 after the O-ring 28 is disposed.

As shown in FIG. 1, a gas outlet 11 is provided on the peripheral wall near the end of the housing 10 on the side where the closing member 30 is attached. The gas ejection ports 11 are holes for ejecting the gas generated inside the cylinder type gas generator 1 </ b> A to the outside, and a plurality of gas ejection ports 11 are provided along the circumferential direction and the axial direction of the housing 10.
Further, a seal member 12 is attached so as to cover the gas outlet 11. By sticking the sealing member 12 so as to cover the gas ejection port 11 of the housing 10, the space inside the housing 10 is hermetically sealed. As the sealing member 12, an aluminum foil or the like having an adhesive member applied on one side is used.

  As shown in FIG. 1, an igniter 35 serving as an igniter that exists at one end of the housing in the axial direction (that is, a portion near the holder 20) generates a flame for burning the granular gas generating agent 40. Is for.

  The igniter 35 is inserted into the hollow opening 21 of the holder 20 and fixed by caulking. The holder 20 has a first caulking portion 26 at an end facing the space inside the housing, and the igniter 35 is inserted into the hollow opening 21 and is attached to the holder 20 in the state where the igniter 35 is attached. By caulking the first caulking portion 26, the igniter 35 is sandwiched by the holder 20 and the igniter 35 is fixed to the holder 20. Another suitable form is a known method in which an igniter and a holder are integrated by injection molding with a thermoplastic resin or the like.

More specifically, the igniter 35 includes a base frame (not shown) through which the pair of terminal pins 32 are inserted and held, and a squib cup 36 attached on the base frame, and is inserted into the squib cup 36. An unillustrated resistor (bridge wire) is attached so as to connect the tips of the terminal pins 37 of the base frame, and an igniter not illustrated in the squib cup 36 so as to surround the resistor or to be in contact with the resistor Is filled, and if necessary, the charge is filled. Nichrome wire or the like is generally used as the resistor, and ZPP (zirconium / potassium perchlorate), ZWPP (zirconium / tungsten / potassium perchlorate), lead tricinate or the like is generally used as the igniting agent. Generally, a composition composed of a metal powder / oxidizer represented by B / KNO ₃ or the like, a composition composed of titanium hydride / potassium perchlorate, or B / 5-aminotetrazole / potassium nitrate / molybdenum trioxide. A composition or the like is used. The squib cup 36 is generally made of metal or plastic.

  When a collision is detected, a predetermined amount of current flows through the resistor via the terminal pin 37. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor, and the ignition powder starts to burn upon receiving this heat. The high temperature flame generated by the combustion ruptures the squib cup containing the igniting agent. The time from when the current flows through the resistor until the igniter 30 is activated is 2 milliseconds or less when a nichrome wire is used as the resistor.

  As shown in FIG. 1, the spacer 27 is provided so that the side part of the squib cup 36 may be covered. The spacer 27 can impart directivity to the flame generated from the ignition agent and transmitted to the outside of the squib cup 36. With such a configuration, the flame is efficiently transmitted by the gas generating agent 40 described later. The spacer 27 has a cylindrical shape and is made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy.

  As shown in FIGS. 1 and 2, in the space inside the housing 10, a gas generating agent 40, a partition member 50, an automatic ignition agent 41, a combustion chamber 17 in which a cushion material 42 is accommodated, a hollow cylindrical filter The filter chamber 18 in which 43 is accommodated is included.

  The gas generating agent 40 is a gas generated by burning the igniting agent ignited by the igniter 35, or is ignited by hot particles and burning to generate gas. The gas generating agent 40 is generally formed as a molded body containing a fuel, an oxidant, and an additive. As the fuel, for example, a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, or a combination thereof is used. Specifically, for example, nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole and the like are preferably used. The oxidizing agent is selected from basic nitrates such as basic copper nitrate, perchlorates such as ammonium perchlorate and potassium perchlorate, alkali metals, alkaline earth metals, transition metals, and ammonia. Nitrate containing cation is used. As the nitrate, for example, sodium nitrate, potassium nitrate and the like are preferably used. In addition, examples of the additive include a binder, a slag forming agent, and a combustion adjusting agent. As the binder, for example, cellulose derivatives such as hydroxypropylene methylcellulose, organic binders such as metal salts and stearates of carboxymethylcellulose, and inorganic binders such as synthetic hydroxytalcite and acidic clay can be suitably used. As the slag forming agent, silicon nitride, silica, acid clay, etc. can be suitably used. Moreover, as a combustion regulator, a metal oxide, ferrosilicon, activated carbon, graphite, etc. can be used suitably.

  The shape of the molded body of the gas generating agent 40 includes various shapes such as a granular shape, a pellet shape, a cylindrical shape, and a disk shape. In addition, a porous (for example, a single-hole cylindrical shape or a porous cylindrical shape) having a hole inside the molded body is also used. These shapes are preferably selected as appropriate according to the specifications of the airbag apparatus in which the cylinder type gas generator is incorporated. For example, the shape in which the gas generation rate changes with time during the combustion of the gas generating agent 40 is used. It is preferable to select. In addition to the shape of the gas generating agent 40, it is preferable to appropriately select the size and filling amount of the molded body in consideration of the linear combustion rate, the pressure index, and the like.

  The autoignition agent 41 has a circular shape mounted on the central axis of the housing 10 at the end of the combustion chamber 17 on the filter 43 side, and one end is in contact with the end of the filter 43 on the combustion chamber 17 side. Yes. The automatic ignition agent 41 is installed in order to prevent the gas generating agent 40 from being excessively combusted before the gas generating agent 40 when it is different from a normal operation such as a fire. Examples of the autoignition agent 41 include a composition obtained by binding aminotetrazole, nitrate, and metal compound with a binder (for example, synthetic hydroxytalcite or acidic clay) and the like. Moreover, as a molded object of the auto-ignition agent 41, it is a powder, granule, gel, extrusion molded product, a product obtained by press molding a pellet-like powder, and the shape thereof is an extruded product or a product molded into a pellet. Is mentioned.

The partition member 50 is a bottomed cup-shaped member having a side wall portion 51 and a bottom portion 52 extending from the side wall portion 51, and is installed so that the bottom portion 52 is sandwiched between the gas generating agent 40 and the automatic ignition agent 41. Furthermore, the bottom 52 of the partition member 50 and the automatic ignition agent 41 are in contact with each other. When the partition member 50 and the autoignition agent 41 are in contact with each other, heat is efficiently transmitted to the autoignition agent 41, and the autoignition agent is appropriately combusted. A partition member is comprised by metal members, such as stainless steel, steel, an aluminum alloy, and a stainless alloy.
Further, the side wall 51 of the partition member 50 is disposed along the housing 10 in contact with the inner peripheral surface of the housing 10 over a wide range. By arranging in this way, the heat received from the outside is efficiently transmitted to the side wall portion 51, and the transferred heat is transferred to the bottom portion 52, so that the automatic ignition agent 41 in contact with the bottom portion 52 is easily burned.
In the present embodiment, the autoignition agent 41 is formed of a columnar pellet and shows a form that is not in contact with the inner peripheral surface of the housing 10. And the cylindrical space | gap prescribed | regulated by the surrounding wall part of the said cylinder and the internal peripheral surface of the housing 10 exists. By providing such a space, heat received from the outside is prevented from being directly transmitted to the automatic ignition agent 41.

  The cushion material 42 is provided for the purpose of preventing the gas generating agent 40 made of a molded body from being crushed by vibration or the like, and has a disk shape. For the cushion material 42, a ceramic fiber molded body, rock wool, foamed resin (for example, foamed silicone, foamed polypropylene, foamed polyethylene, etc.), spring, chloroprene, and rubber typified by EPDM are used.

A filter 43 is accommodated in the filter chamber 18. The filter chamber 18 communicates with the outside through the gas outlet 11 provided on the peripheral wall of the housing 10 described above.

The filter 43 is formed of a cylindrical member having a hollow portion extending in the same direction as the axial direction of the housing 10. If the filter 43 made of a cylindrical member is used in this way, when the gas generated in the combustion chamber 17 passes through the filter 43, the cooling is performed by taking away the high-temperature heat of the gas. In addition to functioning as a means, it also functions as a removing means for removing slag and the like contained in the gas.
As the filter 43, for example, a wire made of a metal such as stainless steel or steel, a wire wound around a net, or a material compressed by pressing is used. Specifically, a knitted wire mesh, a plain weave wire mesh, an assembly of crimped metal wires, or the like is used. Thus, the filter formed by winding and sintering metal wires and nets in a cylindrical shape will contain voids inside, enabling cooling of the gas described above. To do.

  A gas outlet 11 is provided in a cylindrical portion of the housing 10 that defines the filter chamber 18. The gas outlet 11 is a hole for discharging the gas generated inside the cylinder type gas generator 1 </ b> A to the outside, and a plurality of gas outlets 11 are provided along the circumferential direction and the axial direction of the housing 10.

  A female connector (not shown) is attached to the end of the cylinder type gas generator 1A where the holder 20 is disposed. This female connector is a part to which a male connector of a harness for transmitting a signal from a collision detection means provided separately from the cylinder type gas generator 1A is connected. A shorting clip (not shown) is attached to the female connector as necessary. The shorting clip is attached to prevent the cylinder type gas generator 1A from malfunctioning due to electrostatic discharge or the like during the transportation of the cylinder type gas generator 1A. In the stage, the male connector of the harness is inserted into the female connector, so that the contact with the terminal pin 32 is released.

  Next, the operation during normal operation of the cylinder type gas generator 1A described above will be described. When a vehicle equipped with an airbag device incorporating the cylinder-type gas generator 1A according to the present embodiment collides, the collision is detected by a collision detection means provided separately in the vehicle, and ignition is performed based on this. The device 35 is activated. When the igniter 30 is activated, the pressure in the squib cup 36 is increased by combustion of the igniting agent, whereby the squib cup 36 is ruptured, and the flame flows out of the squib cup 36. By the combustion of the ignition agent, the above-described flame reaches the cushion material 42. The flame that has reached the cushioning material 42 burns the cushioning material 42 and opens or divides it, whereby the flame reaches the gas generating agent 40.

  The gas generating agent 52 is ignited and burned by the flowing flame, and a large amount of gas is generated. The generated gas flows into the filter chamber 18, is then cooled to a predetermined temperature via the filter 43, and is ejected from the gas ejection port 11 to the outside of the cylinder type gas generator 1 </ b> A. The gas ejected from the gas ejection port 11 is guided into the airbag to inflate and deploy the airbag.

Next, the operation in the case where the cylinder type gas generator 1A described above is not in a normal operation under a situation such as a fire will be described. When a large amount of heat is applied to the cylinder type gas generator 1A due to a fire or the like, a large amount of heat is transmitted to each of the components constituting the cylinder type gas generator 1A. When a large amount of heat is transmitted to each part, the autoignition agent 41 that burns at a relatively low temperature starts burning. The flame generated by the combustion is transmitted to the gas generating agent 40 and appropriately burns the gas generating agent 40. Here, when the partition member 50 comes into contact with the automatic ignition agent 41, heat can be efficiently transferred from the partition member 50 to the automatic ignition agent 41. Therefore, the gas generating agent 40 can be appropriately used even under a situation such as a fire. Can be burned.

  As described above, by using the cylinder-type gas generator 1A in the present embodiment, the combustion gas can be smoothly discharged even in the event of a fire when the automatic ignition agent and the partition member come into contact with each other. Gas generators.

  FIG. 3 is a schematic view of a gas generator according to Embodiment 2 of the present invention, and FIG. 4 is an enlarged cross-sectional view of FIG. Further, FIG. 5 is a perspective view of the partition member 50. Hereinafter, the internal structure of the cylinder type gas generator according to the second embodiment will be described with reference to FIGS. 3 to 5.

As shown in FIGS. 3 and 4, the gas generator 1 </ b> B in the embodiment of the present invention has a configuration in the combustion chamber 17 when compared with the gas generator 1 </ b> A in the above-described first embodiment of the present invention. It is different. That is, in the gas generator 1B according to Embodiment 2 of the present invention shown in FIG. 3, the cup body 60 is disposed in the combustion chamber 17, and the cushion material 42, the gas generating agent 40, the partition member 50, An automatic ignition agent 41 is contained in the cup body 60. Furthermore, the autoignition agent 41 and the bottom 61 of the cup body 60 are in contact.
In the cup body 60, a cushion material 42, a gas generating agent 40, a partition member 50, and an automatic ignition agent 41 are accommodated in order from the igniter side. The cup body 60 is a cylindrical container closed at both ends, and is made of a metal member such as an aluminum alloy that can be melted by heat during operation.

As described above, when the autoignition agent 41 contacts not only the partition member 50 but also the bottom 61 of the cup body 60, if a large amount of heat is applied to the cylinder type gas generator 1 </ b> B due to a fire or the like, the heat is transferred from the housing 10. It can be transmitted to the cup body 60. As described above, heat can be more efficiently transmitted from both the partition member 50 and the cup body 60 to the automatic ignition agent, which is more preferable.

  Furthermore, in the gas generator 1B according to Embodiment 2 of the present invention shown in FIGS. 3 and 4, a part of the outer surface of the cup body 60 is in contact with the inner surface of the housing 10. With such a configuration, it is more preferable that a large amount of heat is given to the cylinder-type gas generator 1B due to a fire or the like because the heat can be more efficiently transmitted to the automatic ignition agent.

  Furthermore, in the gas generator 1B according to the second embodiment of the present invention shown in FIGS. 3 to 5, a through hole 53 is formed in the partition member 50. By adopting such a configuration, in the case of an operation that is not a normal operation such as a fire, the flame generated in the automatic ignition agent 41 is smoothly transmitted to the gas generating agent 40 without coming out in the direction of the cup body 60. Is more preferable.

  FIG. 6 is an enlarged cross-sectional view of a modified example of the cup body 60. Hereinafter, with reference to FIG. 6, the structure of the cup body 60 in a modification is demonstrated.

As shown in FIG. 6, the cup body 60 in the first modification has a recess 63 in the bottom 61. More specifically, as shown in FIG. 6A, the cup body 60 is provided with a first bottom portion 64, a second bottom portion 65, and a connecting portion 66 in the axial direction. That is, in the case of FIG. 6A, the space surrounded by the first bottom portion 64 and the connecting portion 66 becomes the concave portion 63. More specifically, the second bottom portion 65 extends from the side wall portion 62 of the cup body 60 so as to reduce in diameter toward the center of the housing 10. Further, the connecting portion 66 extends from the opening end of the second bottom portion along the axial direction of the housing 10, and the first bottom portion 64 is formed so as to close one end portion of the cup body 60 from the end portion of the connecting portion 66. . With this configuration, one end portion of the cup body 60 has a stepped portion, and the automatic ignition agent 41 is inserted into the concave portion 63 defined by the first bottom portion 64 and the connecting portion 66. .
As another modified example, an inclined portion 67 is provided on the bottom 61 of the cup body 60 as shown in FIG. That is, in the case of FIG. 6B, the space surrounded by the bottom portion 61 and the inclined portion 67 becomes the concave portion 63. More specifically, the bottom portion 61 has an inclined portion 66 extending from the side wall portion 62 of the cup body 60 in a tapered shape toward the bottom portion 61. And the bottom part 61 is formed so that the end part of the cup body 60 may be obstruct | occluded from the edge part of the inclination part 67. FIG. With this configuration, one end portion of the cup body 60 has the inclined portion 67, and the automatic ignition agent 41 is inserted into the space defined by the bottom portion 61 and the inclined portion 67.
Further, as shown in FIG. 6C, a stepped portion 68 is provided on the bottom 61 of the cup body 60. That is, in the case of FIG. 6B, the space surrounded by the bottom portion 61 and the stepped portion 68 becomes the concave portion 63. More specifically, the bottom portion 61 is formed with a cylindrical thick portion from the side wall portion 62 of the cup body 60 toward the center of the housing 10. With such a configuration, one end of the cup body 60 has a thick stepped portion, and the autoignition agent 41 is inserted into the concave portion 63 defined by the inner peripheral surfaces of the bottom portion 61 and the stepped portion 68. Will be.

  When the recess 63 is formed in the bottom 61 of the cup body 60 as shown in FIGS. 6A to 6C, the automatic ignition agent 41 can be easily positioned, and the automatic ignition agent 41 is resistant to vibration. Since it can also improve property, it is more preferable.

  FIG. 7 is a perspective view of the partition member 50 in the second modification, and FIG. 8 is an enlarged cross-sectional view after a normal operation in the second modification. Hereinafter, with reference to FIG. 7 to FIG. 8, the configuration of the partition member 50 in the second modification and the operation during normal operation will be described.

As shown in FIG. 7, a fragile portion 54 is provided in the vicinity of the through hole 53 of the partition member 50 in Modification 2. By providing the fragile portion 54, when it operates normally, the fragile portion 54 is cleaved as shown in FIG. 8 and covers the end portion of the filter 43 on the combustion chamber 17 side. By performing such an operation, a bypass phenomenon in which the combustion gas flows outside the gas generator 1B without passing through the filter 43 can be prevented, which is more preferable.
Although the shape of the weakened part 54 provided in the bottom part of the cup body 60 is not specifically limited, For example, the linear groove part extended radially from the approximate center point of the bottom part 51 can be formed.

Thus, the above-described embodiment disclosed herein is illustrative in all respects and is not restrictive. The technical scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope equivalent to the description of the claims.

1A to 1B Cylinder type gas generator, 10 housing, 11 gas outlet, 12 seal member, 17 combustion chamber, 18 filter chamber, 20 holder, 21 hollow opening, 23 annular groove, 26 first caulking portion, 27 spacer, 28 O-ring, 30 Closing member, 32 Annular groove, 35 Igniter, 36 Squib cup, 37 Terminal pin, 40 Gas generating agent, 41 Automatic ignition agent, 42 Cushion material, 43 Filter, 50 Partition member, 51 Side wall, 52 Bottom part, 53 Through-hole, 54 Fragile part, 60 Cup body, 61 Bottom part, 62 Side wall part, 63 Recessed part, 64 First bottom part, 65 Second bottom part connecting part, 66 Connecting part, 67 Inclined part, 68 Step part

Claims (5)

A combustion chamber containing a gas generating agent that generates a gas by combustion is included inside, and a gas outlet for ejecting the generated gas to the outside is provided with one end and the other end in the axial direction being closed. A long cylindrical housing,
A hollow opening attached to the housing in a state of being inserted into one end of an opening end in the axial direction of the housing so as to face a space inside the housing and extending in a direction parallel to the axial direction of the housing A metal holder including a portion,
An igniter disposed in the hollow opening and fixed to the holder;
A filter that is disposed in a filter chamber on the other end side of the housing and has a hollow cylindrical shape;
A circular autoignition agent on the other end side of the combustion chamber;
A partition member that partitions the gas generating agent and the autoignition agent ;
The partition member is a bottomed cup-shaped member having a side wall part and a bottom part extending from the side wall part, and the bottom part of the bottomed cup-shaped member in the partition member is in contact with the autoignition agent and normally operates on the bottom part. A through hole is formed to transmit the flame generated by the autoignition agent to the gas generating agent when the operation is not.
Wherein the side wall of the bottomed cup-shaped member in the partition member is in contact with a portion of the inner peripheral surface of the housing, the gas generator. A combustion chamber containing a gas generating agent that generates a gas by combustion is included inside, and a gas outlet for ejecting the generated gas to the outside is provided with one end and the other end in the axial direction being closed. A long cylindrical housing,
A hollow opening attached to the housing in a state of being inserted into one end of an opening end in the axial direction of the housing so as to face a space inside the housing and extending in a direction parallel to the axial direction of the housing A metal holder including a portion,
An igniter disposed in the hollow opening and fixed to the holder;
A filter that is disposed in a filter chamber on the other end side of the housing and has a hollow cylindrical shape;
A cup body that contains the gas generating agent in the combustion chamber of the housing and is installed so that a part of the outer peripheral surface is in contact with the inner peripheral surface of the housing;
A circular autoignition agent on the other end side of the combustion chamber housed in the cup body;
A partition member that partitions the gas generating agent accommodated in the cup body and the autoignition agent;
The partition member is a bottomed cup-shaped member having a side wall part and a bottom part extending from the side wall part, and the bottom part of the bottomed cup-shaped member in the partition member is in contact with the autoignition agent and normally operates on the bottom part. A through hole is formed to transmit the flame generated by the autoignition agent to the gas generating agent when the operation is not.
A gas generator, wherein a side wall portion of the bottomed cup-shaped member in the partition member is in contact with a part of an inner peripheral surface of the cup body. The gas generator according to claim 2 , wherein the autoignition agent and the cup body are in contact with each other. The gas generator according to any one of claims 2 to 3 , wherein a concave portion is formed at a bottom portion of the cup body, and the autoignition agent is provided in the concave portion. The gas generator according to any one of claims 1 to 4 , further comprising a fragile portion in the vicinity of the through hole of the partition member.

Images