JP6310735B2 - 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.

  As documents disclosing the specific structure of the cylinder type gas generator described above, there are, for example, Japanese Patent Application Laid-Open No. 2005-313812 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2011-143777 (Patent Document 2). In the cylinder type gas generators disclosed in Patent Documents 1 and 2, an igniter and a charge transfer agent are disposed at one end of the long cylindrical housing in the axial direction, and the gas is generated at a substantially central portion in the axial direction. A gas chamber is provided with a working gas generation chamber (combustion chamber) in which a working gas is generated by containing the agent and burning the gas generating agent, and a filter is accommodated at the other end in the axial direction. Is provided.

  In the cylinder type gas generator having the above configuration, the flame generated by the operation of the igniter is transmitted to the gas generating agent through the combustion of the charge transfer agent, whereby the gas generating agent burns and the high-temperature and high-pressure working gas is burned. Is generated in the working gas generation chamber, and the generated working gas flows from the working gas generation chamber (combustion chamber) into the filter chamber along the axial direction of the housing, passes through the filter, and passes through the filter to the outside of the housing. Erupted into. The working gas ejected from the gas ejection port is then used for inflation and deployment of the airbag.

  Among these, Patent Document 2 discloses a gas generator in which a partition member is arranged in a gas generating agent, and the partition member is provided with a first communication hole and a second communication hole. . In the gas generator in which the partition member is arranged, it is possible to prevent the flow resistance of the gas in which the unburned gas generating agent is operated, and a stable output characteristic can be obtained.

JP 2005-313812 A JP 2011-143777 A

  The gas generator disclosed in Patent Document 2 described above must rupture the walls of the first hermetic container at two locations, the igniter side and the partition member side, when the first hermetic container is in operation. To achieve time is a disadvantageous condition. Further, since the radial clearance between the first sealed container and the housing is narrow, it must be assembled carefully so as not to be deformed at the time of assembling, and a long assembling time is required.

  Therefore, the present invention has been made to solve the above-described problems, and a gas having a configuration that can be easily assembled by caulking a cup-shaped member containing a gas generating agent and a holder in the axial direction. The purpose is to provide a generator.

  The gas generator according to the present invention includes a housing, a holder, an igniter, a partition member, and a cup-shaped member. The housing includes a combustion chamber in which gas is generated when the gas generating agent burns, and both ends in the axial direction are closed, and gas outlets for ejecting the generated gas to the outside are provided. It is 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. There is a gap between the combustion chamber in which the gas generating agent is accommodated and the inner peripheral surface of the housing. The cup-shaped member defines a partition member having an opening in the radial direction in which the igniter is closed, the gap, and the combustion chamber, and a gas generating agent accommodated in the combustion chamber faces the igniter. The gas generating agent is accommodated in the combustion chamber so as to achieve the above state. The partition member is positioned in contact with the cup-shaped member and the housing in the axial direction, and regulates the flow of gas generated from the combustion chamber inside the cup-shaped member. The cup-shaped member has a flange portion, the holder has a caulking collar portion extending from one end surface of the holder, the flange portion is arranged on the holder, and the caulking collar portion is caulked in the axial direction. The shape member is fixed.

  In the gas generator according to the present invention, a seal member is preferably disposed between the flange portion of the cup-shaped member and the groove portion of the holder.

  In the gas generator according to the present invention, the radial distance of the gap formed between the radial inner surface of the housing and the radial outer surface of the cup-shaped member is the groove portion of the holder. It is preferable that it is substantially the same as the length in the radial direction of the caulking portion composed of the caulking collar portion.

In the gas generator based on the said invention, it is preferable that the said cup-shaped member has an opening part and the opening part is sealed with the sealing member.

  In the gas generator according to the present invention, the gas generating agent preferably contains a perchlorate.

  In the gas generator according to the present invention, the gas generating agent preferably contains 3 to 15 mass percent of perchlorate.

According to the present invention, by simply caulking the cup-shaped member containing the gas generating agent and the holder in the axial direction, it is possible to secure a flow path for the gas generated from the combustion chamber and to simplify the assembly. Gas generators. Further, the caulking collar portion is caulked in the axial direction, and the radial distance of the gap formed between the cup-shaped member and the radial outer surface is such that the caulking portion formed by the groove portion and the caulking collar portion of the holder. By making the length substantially the same as the length in the radial direction, when the working gas in the combustion chamber flows into the gap and the pressure in the gap rises when the gas generator is actuated, Since the pushing force is applied to the side, the working gas can be prevented from bypassing and flowing out of the gas generator from the interface between the cup-shaped member and the holder and the interface between the housing and the holder.

It is the schematic of the gas generator in embodiment of this invention. It is an expanded sectional view of the area | region I shown in FIG. It is an expanded sectional view of the area | region II 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 III shown in FIG. It is an expanded sectional view of the area | region III shown in FIG. It is the schematic of the gas generator in Embodiment 3 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 an embodiment 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 FIGS. 2 and 3 which are enlarged sectional views.

As shown in FIG. 1, a cylinder type gas generator 1 </ b> A in the present embodiment has a long and substantially cylindrical outer shape, and includes a housing 10 and a holder 20. The housing 10 is composed of a long cylindrical member having an opening at least at one end in the axial direction.
As shown in FIGS. 1 and 2, 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 an annular groove 23 for caulking and fixing described later is provided at a predetermined position on the outer peripheral surface of the holder 20. A first caulking portion 26 is provided at an end portion facing the space. A caulking collar portion 27 extends from the outer peripheral surface of one end of the holder. 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. On the other hand, the first caulking portion 26 is a portion for fixing the igniter 30 as described later, and the caulking collar portion 27 is a portion for fixing a cup-shaped member 38 described later by caulking in the axial direction. . The holder 20 is attached to the open end of the housing 10.
In the holder 20, it is preferable that an annular groove portion is formed along the caulking collar portion in the connecting portion 28 where the caulking collar portion 27 extends. Here, it is preferable that a seal member is disposed between the flange portion 37 of the cup-shaped member 38 and the groove portion of the holder. As the sealing member, it is preferable to use a material made of a material having sufficient heat resistance and durability. For example, an EPDM O-ring or the like is preferably used. As another preferred embodiment, if a liquid sealing agent is applied to a portion where the sealing member is interposed, the sealing property of the space inside the housing 10 can be further improved.

  The housing 10 and the holder 20 may each be made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy, or by pressing a rolled steel plate represented by SPCE. A metal press-molded product molded into a bottomed cylindrical shape, or a metal molded product molded into a bottomed cylindrical shape by closing one of the axial ends of an ERW pipe typified by STKM It may be configured. 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 housing 10 and the holder 20 are connected and fixed by caulking. 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.

  As shown in FIG. 1, a gas outlet 11 is provided on the peripheral wall near the opposite end of the housing 10 to which the holder 20 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.

  As shown in FIG. 1, an igniter 30 as an igniting means existing at one end of the housing in the axial direction (that is, a portion near the holder 20) generates a flame for burning a granular gas generating agent 52 described later. It is for generating.

  The igniter 30 is inserted into the penetrating portion 21 of the holder 20 and fixed by caulking. More specifically, as shown in FIG. 2, the holder 20 has a first caulking portion 26 at the end facing the space inside the housing, and the igniter 30 is inserted into the through portion 21. By caulking the first caulking portion 26 in a state of being held against the holder 20, the igniter 30 is clamped by the holder 20 and the igniter 30 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 30 includes a base frame (not shown) through which the pair of terminal pins 32 are inserted and held, and a squib cup (not shown) attached on the base frame, and is inserted into the squib cup. A resistor (bridge wire) (not shown) is attached so as to connect the tips of the terminal pins 32 of the base frame, and an igniting agent (not shown) is placed in the squib cup so as to surround the resistor or to contact the resistor. Filled, and filled with explosives as needed. 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 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 32. 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, in the space inside the housing 10, there are a combustion chamber 17 in which a gas generating agent is stored, a filter chamber 18, and a gap 19 between the combustion chamber 17 and the inner peripheral surface of the housing 10. The combustion chamber 17, the gap 19, and the partition member 61 are partitioned by a cup-shaped member 38 described later. The combustion chamber 17 is located at a substantially central portion of the housing 10 in the axial direction, and an igniter 30, a cushion material 51, and a gas generating agent 52, which will be described later, are accommodated therein. The filter chamber 18 is located at the other end portion in the axial direction of the housing 10 (that is, the closed portion side of the housing 10), and a filter 53 described later is accommodated therein.

The cup-shaped member 38 is composed of a first cup-shaped member 35 and a second cup-shaped member 41, and has a bottomed cylindrical shape. Here, the cup-shaped member 38 is configured such that the first cup-shaped member 35 is inserted into the second cup-shaped member 41 and overlapped. The first cup-shaped member 35 has a bottomed cylindrical shape and is disposed so as to face the igniter 30. In the combustion chamber 17 that is an internal space formed by the first cup-shaped member 35 and the igniter 30, a cushion material 51 and a gas generating agent 52 are disposed.
The cup-shaped member 38 can be composed of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy. Moreover, when setting it as the layered structure of the 1st cup-shaped member 35 and the 2nd cup-shaped member 41, each member can be comprised with metal members, such as stainless steel, steel, an aluminum alloy, and a stainless alloy. . The first cup-shaped member 35 is preferably a thin film as compared with the second cup-shaped member 41, and a material having a lower strength or hardness than the second cup-shaped member 41 such as an aluminum thin film is used. It is preferable to do.

  The gas generating agent 52 is a gas generated by burning the igniting agent ignited by the igniter 30 or is ignited by the hot particles and burning to generate gas. The gas generating agent 52 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 hydroxypropylmethylcellulose, 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 52 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 52 is used. It is preferable to select. In addition to the shape of the gas generating agent 52, 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.

As the gas generating agent 52, it is particularly preferable to use a gas containing a guanidine compound as a fuel and containing a perchlorate as an oxidizing agent. If a gas generating agent containing this guanidine-based compound and perchlorate is used, there will be no toxicity problem as in the case of an azide compound.
In particular, it is preferable to contain perchlorate in the gas generating agent to promote the combustion of the gas generating agent, so that the air bag can be inflated in a short time after the collision is detected and the gas can be completely discharged. In particular, it is more preferable that the gas generating agent contains 3 to 15 percent by weight of perchlorate because the above effect is enhanced.

  The cushion material 51 corresponds to a crushing prevention member for preventing the gas generating agent 52 made of a molded body from being crushed by vibration or the like, and preferably a ceramic fiber molded body, foamed silicon, metal spring or the like is used. Is done. The cushion material 51 is opened or divided by combustion of the igniter 30 during operation, and in some cases, is burned out.

The first cup-shaped member 35 includes a first cup portion 36 and a first flange portion 37 extending from the opening end of the first cup portion. The cup-shaped member 38 is fixed to the holder 20 by caulking the caulking collar portion 27 of the holder 20 with respect to the first flange portion 37 in the housing radial direction.
The first cup-shaped member 35 is made of a thin film than the second cup-shaped member described later so as to be easily ruptured by the generated gas, or made of a material having a lower strength than the second cup-shaped member 41. Is preferred. For example, the first cup-shaped member can be composed of a thin film made of metal such as stainless steel, steel, aluminum alloy, and stainless alloy.

The second cup-shaped member 41 includes a second cup portion 42 and a second opening 43 provided on the peripheral wall of the second cup portion. Furthermore, on the opening end side of the side wall of the second cup-shaped member 41, a second flange portion 44 of the second cup-shaped member is extended. The second cup-shaped member 41 is disposed so as to overlap the first cup-shaped member 35. Here, the caulking collar portion of the holder 20 is sandwiched between the first flange portion 37 of the first cup-shaped member and the flange portion 44 of the second cup-shaped member.
The opening 43 of the second cup-shaped member is provided on the peripheral wall near the bottom of the cup-shaped member. The opening 43 communicates with each other and a plurality of the openings 43 are provided. The plurality of second openings 43 are smaller than the outer shape of the gas generating agent 52, and several rows are provided in the circumferential wall of the second cup-shaped member 41 so as to form an opening row along the circumferential direction. And the peripheral wall of the 2nd cup-shaped member 41 has the opening part formation area in which the said 2nd opening part 43 exists in the part near the said partition member 61, and the opening non-formation area in the part near an igniter. doing. The central part of the opening forming region of the second opening 43 existing in a plurality of rows is arranged so as to be closer to the partition member 61 described later than the central part of the second cup-shaped member 41. By disposing the second opening 43 in this manner and disposing the first cup-shaped member therein, the internal pressure inside the combustion chamber 17 can be sufficiently increased, and the gap 19 is formed from the second opening 43. When the gas flows, the generated gas immediately flows to the third opening 65 of the partition member 61, so that the generated gas can be smoothly guided to the filter chamber.
The total area A1, which is the sum of the opening areas of the plurality of second openings 43, is sufficiently large so as not to inhibit the gas flow. Specifically, the total area A1 is the opening area of the third opening 65 of the partition member 61. The total area A2 is larger than the total area A2, which is the sum, and is larger than the total area A3, which is the sum of the opening areas of the plurality of jet outlets 11 existing on the peripheral wall of the housing.
The bottom portion of the second cup-shaped member is constituted by a tapered portion 45 extending from the peripheral wall portion of the partition-shaped member 61 and a bottom plate portion 46 extending from the tapered portion 45.
In the first embodiment, the partition member 61 has a tapered projection extending along the outer peripheral surface at the bottom, and the taper of the second cup-shaped member 41 is formed on the taper of the projection. Both members are fixed by contacting the parts.

  As described above, the cylinder-type gas generator 1A according to the present embodiment has a configuration in which the gas generating agent 52 is sealed in the cup-shaped member 38. Therefore, the gas generating agent 52 is sealed in the cup-shaped member 38 in advance. As a result, the assembly work of the cylinder type gas generator 1A is facilitated, and the number of parts can be reduced and the configuration can be simplified. Further, in the cylinder type gas generator in the present embodiment, since the cushion material 51 is previously enclosed in the cup-shaped member 38 in addition to the gas generating agent 52, the assembly work of the cylinder type gas generator 1A is further performed. A facilitating effect is also obtained. Further, by caulking and fixing the cup-shaped member 38 to the holder 20 in the radial direction, the number of parts can be suppressed, the assembling work is easy, and the effect of improving the gas tightness of the gas generating agent can be obtained.

A gap 19 is formed between the inner peripheral surface of the housing 10 and the outer peripheral surface of the second cup-shaped member 41. Here, it is preferable that the radial distance of the gap 19 is substantially the same as the radial length of the caulking portion formed by caulking the flange portion 27 of the holder and the caulking flange portion. In this way, the formation of the gap 19 makes it possible to secure the flow path.
Combustion gas and slag are generated as the gas generating agent 52 burns, but the combustion gas and slag pass through the gap 19 and cause the combustion gas and slag to collide with the inside of the housing 10 and the surface of the first cup-shaped member 35. Thus, the temperature of the combustion gas is lowered, and slag is adhered to the inner surfaces of the housing 10 and the first cup-shaped member 35.
The gap 19 exists between the outer peripheral surface of the partition member 61 and the cup-shaped member 38, which will be described later, and the inner peripheral surface of the housing, and reaches the region where the opening of the cup-shaped member is not formed. Thus, it is possible to realize sufficient gas retention by securing a sufficient gas flow path.

As shown in FIG. 3, a partition member 61 made of a substantially cup-shaped member is disposed at a predetermined position in the axial direction of the housing 10. The partition member 61 includes a third cup bottom 62, a third cup side 63, a third flange 64 extending from the opening end of the cup side 63, and a third wall provided on the peripheral wall of the third cup side. It consists of an opening 65 and a hollow space 66 defined by the third cup bottom 62 and the third cup side 63. The partition member 61 is disposed in order to efficiently send the gas generated from the gas generating agent 52 and flowing into the gap 19 to the filter chamber 18. Here, the 3rd flange part 64 is arrange | positioned in contact with the filter 65 mentioned later. In the present embodiment, the partition member 61 has the third cup bottom 62 in contact with the bottom of the cup-shaped member 38, and the third opening 65 communicates in the radial direction of the housing.
In addition, the total area A2 of the opening areas of the plurality of third openings 65 is preferably an area formed smaller than the total area A3 of the nozzles 11 existing on the peripheral wall of the housing.

  A filter 53 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 53 is a cylindrical member having a hollow portion extending in the same direction as the axial direction of the housing 10. If the filter 53 made of a cylindrical member is used in this way, when the gas generated in the combustion chamber 17 passes through the filter 53, cooling is performed by taking the high-temperature heat of the gas and cooling 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. By doing so, when slag that could not be collected when passing through the gap 19 remains, almost all of the slag can be finally collected by the filter 53. If most of the slag can be collected in the gap 19, the filter 53 may be omitted.
As the filter 53, for example, a wire or a net made of a metal such as stainless steel or steel, a material wound by pressing, a material compressed by pressing, a material wound with a perforated metal plate, or the like is used. Specifically, a knitted wire mesh, a plain weave wire mesh, an assembly of crimped metal wires, or the like is used. In addition, as a perforated metal plate, for example, expanded metal that has been cut into a zigzag pattern on the metal plate and expanded to form a hole and processed into a mesh shape, or a hole is formed in the metal plate and at that time A hook metal or the like obtained by flattening the burr generated at the periphery of the hole is used. In this case, the size and shape of the hole to be formed can be appropriately changed as necessary, and holes of different sizes and shapes may be included on the same metal plate. In addition, as a metal plate, a steel plate (mild steel), a stainless steel plate, for example can be used suitably, and plates, such as aluminum, copper, titanium, nickel, or these alloys, can also be utilized.
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. When the gas passes through the filter 53, the filter 53 functions as a cooling means for cooling the gas by taking away the high-temperature heat of the gas, and removes residues (slag) contained in the gas. It also functions as a removing means.

  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 | movement at the time of the action | operation of the cylinder type gas generator 1A demonstrated above is demonstrated. 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 30 is activated. When the igniter 30 is activated, the pressure in the igniter 31 increases due to combustion of the igniting agent, whereby the igniter 31 is ruptured and the flame flows out of the igniter 31. By the combustion of the ignition agent, the above-described flame reaches the cushion material 51. The flame that has reached the cushion material 51 burns the cushion material 51 and opens or divides it, whereby the flame reaches the gas generating agent 52.

  The gas generating agent 52 is ignited and burned by the flowing flame, and a large amount of gas is generated. Due to the combustion of the gas generating agent 52, the pressure in the combustion chamber 17 increases, and the first cup-shaped member 35 is destroyed. The generated gas passes through the second opening 43 of the second cup-shaped member 41 and is guided to the gap 19, and further passes through the third opening 65 of the partition member 61, and then flows into the filter chamber 18. The gas is cooled to a predetermined temperature via 53 and ejected from the gas ejection port 11 to the outside of the cylinder type gas generator 1A. The gas ejected from the gas ejection port 11 is guided into the airbag to inflate and deploy the airbag.

  As described above, by using the cylinder-type gas generator 1A in the present embodiment, the combustion residue generated from the gas generating agent is efficiently collected, so that the filter can be made small and manufactured at low cost. It can be set as the gas generator of the structure which can do.

  FIG. 4 is a schematic diagram of a gas generator according to Embodiment 2 of the present invention. Hereinafter, the configuration of the gas generator 1B in the present embodiment will be described with reference to FIGS.

  As shown in FIG. 4, the gas generator 1B according to the embodiment of the present invention differs in the configuration of the housing 10 and the filter 53 when compared with the gas generator 1A according to the above-described first embodiment of the present invention. ing. That is, in the gas generator 1B according to Embodiment 2 of the present invention shown in FIG. 4, the bottom of the housing 10 is formed in a hemispherical shape. Further, the filter 53 is configured along the side and bottom of the housing 10.

  In addition, the cup-shaped member 38 is not composed of two types of cup-shaped members (the first cup-shaped member 35 and the second cup-shaped member 41) as shown in FIG. By disposing the seal member 47 for closing the second opening 43 on the inner surface of the two openings 43, the first cup-shaped member can be omitted. In this case, the flange portion 44 of the second cup-shaped member 41 is fixed by caulking with the caulking collar portion 27 of the holder 20.

  Even when these configurations are adopted, the gap 19 formed between the housing 10 and the cup-shaped member 35 is formed, and the first cup-shaped member 35 is caulked in the axial direction by the first flange portion 37. In the case of being configured, it is possible to obtain the same effect as that described in the above-described embodiment, and it is possible to provide a gas generator having a configuration that can be manufactured at low cost.

  FIG. 7 is a schematic view of a gas generator according to Embodiment 3 of the present invention. Hereinafter, the configuration of the gas generator 1C in the present embodiment will be described with reference to FIG.

As shown in FIG. 4, the gas generator 1 </ b> C according to the embodiment of the present invention is different from the partition member 61 when compared with the gas generator 1 </ b> A according to the first embodiment of the present invention described above. That is, in the gas generator 1C according to Embodiment 3 of the present invention shown in FIG. 7, the partition member 61 is fixed by caulking the housing 10 from the outside in the axial direction.
Here, caulking so as to sandwich the third flange portion 64 of the partition member 61 increases the fixing force of the partition member 61, and thus stable performance is obtained. Further, if slag is collected in the gap 19, the filter can be omitted, which is more preferable.

  Even when these configurations are adopted, the gap 19 formed between the housing 10 and the cup-shaped member 35 is formed, and the first cup-shaped member 35 is caulked in the axial direction by the first flange portion 37. In the case of being configured, it is possible to obtain the same effect as that described in the above-described embodiment, and it is possible to provide a gas generator having a configuration that can be manufactured at low cost.

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 terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1A to 1C Cylinder type gas generator, 10 housing, 11 gas outlet, 17 combustion chamber, 18 filter chamber, 19 gap, 20 holder, 21 hollow opening, 23 annular groove, 26 first caulking portion, 27 caulking collar portion , 28 connecting portion, 30 igniter, 31 ignition portion, 32 terminal pin, 35 first cup-shaped member, 36 first cup portion, 37 first flange portion, 38 cup-shaped member, 41 second cup-shaped member, 42 second 2 cup part, 43 2nd opening part, 44 2nd flange part, 45 taper part, 46 bottom plate part, 47 sealing member, 51 cushioning material, 52 gas generating agent, 53 filter, 61 partition member, 62 3rd cup bottom part, 63 3rd cup side part, 64 3rd flange part, 65 3rd opening part, 66 hollow space

Claims (7)

A gas ejection port is provided for ejecting the generated gas to the outside, including a combustion chamber in which gas is generated by the combustion of the gas generating agent and having one end and the other end in the axial direction closed. A long tubular housing formed,
A hollow opening 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. A metal holder,
An igniter disposed in the hollow opening and fixed to the holder;
Having a gap between the combustion chamber in which the gas generating agent is accommodated and the inner peripheral surface of the housing;
A partition member having a radial opening that is closed on the igniter side, the gap, and a combustion chamber are defined, and the gas generating agent accommodated in the combustion chamber faces the igniter. A cup-shaped member disposed in the combustion chamber;
A tapered portion is formed on the closed end side of the cup-shaped member,
The tapered portion on the closed end side of the cup-shaped member is fitted with a tapered portion provided in the partition member,
The cup-shaped member has a flange portion, the holder has a first caulking collar portion extending from one end surface of the holder, the flange portion is disposed on the holder, and the first caulking collar portion is caulked in the radial direction. It said cup-shaped member is fixed by,
The first caulking collar is sandwiched between the inner peripheral surface of the housing and the outer peripheral surface of the cup-shaped member;
The holder has a second caulking collar portion extending from one end surface of the holder, and the igniter is fixed by caulking the second caulking collar portion in a radial direction,
The flange part of the cup-shaped member is sandwiched between the first caulking collar part and the second caulking collar part,
A gas generator characterized by.   The gas generator according to claim 1, wherein a seal member is disposed between a flange portion of the cup-shaped member and a groove portion of the holder. The radial distance of the gap formed between the radially inner surface of the housing and the radially outer surface of the cup-shaped member is the radial length of the caulking portion formed by the groove portion and the caulking collar portion of the holder. The gas generator according to claim 1 or 2, which is substantially the same.   The gas generator according to any one of claims 1 to 3, wherein the cup-shaped member has an opening, and the opening is sealed with a seal member.   The gas generator according to claim 1, wherein the gas generating agent contains a perchlorate.   6. The gas generator according to claim 5, wherein the gas generating agent contains 3 to 15 mass percent of the perchlorate. A long cylindrical housing provided with a gas outlet for ejecting the generated gas to the outside, with one end and the other end in the axial direction closed.
A hollow opening 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. A metal holder,
An igniter disposed in the hollow opening and fixed to the holder;
A cup-shaped member installed inside the housing,
The cup-shaped member contains a gas generating agent therein, and has a gap between the outer peripheral surface of the cup-shaped member and the inner peripheral surface of the housing,
A tapered portion is formed on the closed end side of the cup-shaped member,
The tapered portion on the closed end side of the cup-shaped member is fitted with a tapered portion provided in the partition member,
The cup-shaped member has a flange portion, the holder has a first caulking collar portion extending from one end surface of the holder, the flange portion is disposed on the holder, and the first caulking collar portion is caulked in the radial direction. The cup-shaped member is fixed by
The first caulking collar is sandwiched between the inner peripheral surface of the housing and the outer peripheral surface of the cup-shaped member;
The holder has a second caulking collar portion extending from one end surface of the holder, and the igniter is fixed by caulking the second caulking collar portion in a radial direction,
The flange part of the cup-shaped member is sandwiched between the first caulking collar part and the second caulking collar part,
A gas generator characterized by.

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