WO2010126057A1 - ガス発生器 - Google Patents
ガス発生器 Download PDFInfo
- Publication number
- WO2010126057A1 WO2010126057A1 PCT/JP2010/057492 JP2010057492W WO2010126057A1 WO 2010126057 A1 WO2010126057 A1 WO 2010126057A1 JP 2010057492 W JP2010057492 W JP 2010057492W WO 2010126057 A1 WO2010126057 A1 WO 2010126057A1
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- WO
- WIPO (PCT)
- Prior art keywords
- partition member
- housing
- filter
- gas generator
- working gas
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06D—MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART)
- C06D5/00—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets
- C06D5/06—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets by reaction of two or more solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
- B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R2021/26011—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using a filter through which the inflation gas passes
Definitions
- 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 specifically to a so-called cylinder type gas generator having a long cylindrical outer shape.
- airbag devices which are occupant protection devices, have been widely used from the viewpoint of protecting occupants of automobiles and the like.
- 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 position and output 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 passenger seat airbag device, a curtain airbag device, a knee airbag device, or the like.
- As a gas generator having a long cylindrical outer shape there is a so-called T-shaped gas generator other than the cylinder type gas generator.
- references disclosing the specific structure of the cylinder type gas generator described above include, for example, Japanese Patent Application Laid-Open No. 2005-313812 (Patent Document 1), Japanese Patent Application Laid-Open No. 11-78766 (Patent Document 2), and Japanese Patent Application Laid-Open No. 2002-2002. No. 166818 (Patent Document 3).
- an igniter and a charge transfer agent are arranged at one end portion in the axial direction of a long cylindrical housing, and the gas generating agent is accommodated in a substantially central portion in the axial direction.
- a working gas generation chamber in which a working gas is generated by burning the gas generating agent is provided, and a filter chamber in which a filter is accommodated and a gas outlet are provided at the other end in the axial direction.
- 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.
- the generated working gas flows into the filter chamber from the working gas generation chamber along the axial direction of the housing, passes through the filter, and is ejected from the gas outlet to the outside of the housing. The The working gas ejected from the gas ejection port is then used for inflation and deployment of the airbag.
- Japanese Patent Laid-Open No. 2002-166818 discloses a cylinder type gas generator in which a bottomed cylindrical partition member is arranged in a working gas generation chamber (particularly, Japanese Patent Laid-Open No. 2002-166818). ).
- the space inside the housing is partitioned into the working gas generation chamber and the filter chamber, and further inside the working gas generation chamber. Since a hollow space having the same shaft center as that of the housing can be formed, the gas from the gas generating agent flows into and discharged from the hollow space as needed, and the apparatus can be miniaturized. At the same time, the airbag can be gradually inflated and deployed.
- JP 2005-313812 A Japanese Patent Application Laid-Open No. 11-78766 JP 2002-166818 A
- the housing which is a strong component, can be made from a conventionally used member made of stainless steel, steel, etc., to a small-diameter press-formed product such as a rolled steel plate represented by SPCC, SPCD, SPCE, or STKM. Attempts have been made to change to a molded product of a typical ERW pipe.
- non-azide gas generating agents have become widespread as gas generating agents used in gas generators.
- the generated working gas has a relatively low temperature, and although a merit that can be suitably used for an airbag device is obtained, a gas generating agent of another composition is used.
- a problem that the ignitability is poor compared to the case, and a problem that it is necessary to be placed in a high-pressure environment for stable combustion. Therefore, in order to reduce the size and weight of the housing of the cylinder type gas generator, it is necessary to take these points into consideration.
- the housing in the cylinder type gas generator, it is necessary to provide the housing with pressure resistance so that it can sufficiently withstand the increase in the internal pressure of the working gas generation chamber due to the combustion of the gas generating agent to generate the working gas. .
- a pressure resistance In order to give such a pressure resistance to the housing, when a small-diameter housing is configured by press-molding a high-strength member such as a high-tensile steel plate, it can sufficiently withstand the increase in internal pressure of the working gas generation chamber. Although it can be performed, a significant residual stress is generated in the housing during the press working, and it becomes difficult to give the housing sufficient strength particularly in a low temperature environment. In order to solve this, it is necessary to perform a process such as annealing.
- the housing when the housing is to be configured with a small-diameter press-formed product made of the rolled steel plate or the molded product of an electric resistance welded tube, the housing can have sufficient strength in a low-temperature environment. In addition, it becomes difficult to provide the housing with pressure resistance that can withstand the increase in the internal pressure of the working gas generation chamber.
- the cylinder-type gas generator in order to reduce the size and weight of the cylinder-type gas generator (particularly to reduce the diameter and weight), maintain the working gas generation chamber in a high-pressure environment suitable for the combustion of the gas generating agent during operation. All the conditions such as preventing the generated working gas from being trapped in the working gas generation chamber and increasing the initial operation speed, making the housing have sufficient pressure resistance and sufficient strength in a low temperature environment, etc. It is necessary to satisfy, and it is very difficult to realize it.
- the gas generating agent is formed as granular small pellets, but it is practical to fill each of the granular gas generating agents into the working gas generating chamber while individually adjusting the arrangement position and orientation thereof. Impossible. Therefore, in many cases, the granular gas generating agent is randomly filled in the working gas generation chamber without adjusting its arrangement position and orientation.
- the density of the gas generating agent in the working gas generation chamber may be biased.
- this density deviation of the gas generating agent occurs, it will greatly affect the output characteristics of the cylinder type gas generator, resulting in large variations in the output characteristics among products.
- the volume of the working gas generation chamber in which the gas generating agent is accommodated can be configured to be relatively large.
- the problem of uneven density of the gas generating agent is very serious. It becomes a problem.
- the problem of the uneven density of the gas generating agent is not an exception even in the cylinder type gas generator configured as disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2002-166818, and can be a very serious problem. That is, by using a cylinder type gas generator having a configuration as disclosed in JP-A-2002-166818, it is possible to achieve excellent output characteristics by disposing a partition member in the working gas generation chamber. However, depending on the filling state of the gas generating agent, the output characteristics may vary greatly.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a small and lightweight gas generator that can stably obtain desired output characteristics.
- the gas generator according to the present invention includes a housing, ignition means, a partition member, and a partition member.
- the housing is formed of a long cylindrical member whose both ends in the axial direction are closed, and is generated in a working gas generation chamber in which a working gas is generated by burning a gas generating agent, and in the working gas generation chamber. And a filter chamber containing a filter through which the working gas passes.
- the ignition means generates a flame for burning the gas generating agent, and is arranged at one end of the housing in the axial direction.
- the partition member is located inside the housing, and partitions a space inside the housing into the working gas generation chamber and the filter chamber in the axial direction.
- the partition member is located inside the working gas generation chamber and partitions the working gas generation chamber.
- the filter chamber is located on the other end side in the axial direction of the housing from the working gas generation chamber.
- a plurality of gas jets for ejecting the working gas that has passed through the filter to the outside are provided on the peripheral wall portion of the housing that defines the filter chamber.
- the partition member is configured by a bottomed cylindrical member having a hollow portion arranged coaxially with the housing, and from the end of the partition member on the working gas generation chamber side of the housing.
- a cylindrical portion extending along the axial direction and a bottom portion that closes an end portion of the cylindrical portion on the ignition means side are included.
- the bottom of the partition member is located closer to the partition member than the end of the working gas generation chamber on the ignition means side.
- the gas generating agent is accommodated in the working gas generation chamber in a portion excluding the hollow portion of the partition member.
- the cylindrical portion of the partition member is provided with a plurality of first communication holes that communicate the space in which the gas generating agent of the working gas generation chamber is accommodated with the hollow portion of the partition member.
- a second communication hole for communicating the hollow portion of the partition member and the filter chamber is provided at the center of the partition member.
- the bottom of the partition member has a tapered shape whose outer shape gradually decreases toward the ignition means.
- the outer surface of the bottom portion of the partition member has a substantially hemispherical shape.
- the outer surface of the bottom portion of the partition member may have a substantially conical surface shape.
- the cylindrical portion of the partition member has a cylindrical portion whose inner diameter and outer diameter are constant along the axial direction of the housing. In that case, it is preferable that the plurality of first communication holes described above are provided in the cylindrical portion of the partition member.
- the cylindrical portion of the partition member continuously extends from the end of the cylindrical portion on the partition member side, and gradually toward the partition member side. You may have further the enlarged diameter part which expands in diameter.
- the housing includes a long, bottomed cylindrical first housing member that constitutes the other end portion and the peripheral wall portion of the housing, and the first housing member.
- a second housing member (squib holder) that constitutes the one end portion of the housing by closing the open end may be included, and in this case, the first housing member is arranged in the axial direction of the ERW pipe. It is preferable that it is comprised with the molded article formed by closing one end part.
- the outer diameter R1 of the first housing member satisfies the condition of 15 mm ⁇ R1 ⁇ 22 mm, and the partition member from the boundary portion between the bottom and the cylindrical portion in the partition member
- the distance L1 from the bottom to the end on the ignition means side satisfies the condition of 1 mm ⁇ L1 ⁇ 7 mm, and the end of the partition member on the ignition means side from the bottom on the ignition means side
- the distance L2 to the end on the ignition means side and the diameter R2 of the working gas generation chamber satisfy the condition of 0.026 ⁇ L2 / R2 ⁇ 0.71, and the distance of the hollow portion of the partition member It is preferable that the diameter R3 and the diameter R2 of the working gas generation chamber satisfy the condition of 0.28 ⁇ R3 / R2 ⁇ 0.54.
- the gas generating agent preferably contains a guanidine-based compound as a fuel and basic copper nitrate as an oxidizing agent.
- the gas generator according to the present invention further includes a crush prevention member for preventing crushing of the gas generating agent due to vibration, a first sealed container that is located inside the housing and has a sealed accommodation space, In this case, it is preferable that the gas generating agent, the partition member, and the anti-crushing member are accommodated in the accommodating space of the first sealed container.
- the gas generator according to the present invention may further include a second sealed container that is located inside the housing and has a sealed housing space.
- the ignition means includes an igniter including an igniter that generates a flame by combustion, and a transfer agent for transmitting the flame generated in the igniter to the gas generating agent. It is preferable that the above-mentioned transfer charge is stored in the storage space of the second sealed container.
- the filter preferably has a hollow communication portion extending along the axial direction of the housing, and the hollow communication portion is the working gas of the filter. It is preferable to reach at least the end surface on the generation chamber side.
- the partition member extends continuously from the inner peripheral edge of the annular plate portion toward the hollow communication portion of the filter by covering the end face of the filter with the annular plate portion.
- the cylindrical protrusion part which covers the inner peripheral surface near an end surface is included, and it is preferable that the said 2nd communicating hole is prescribed
- the cylindrical protruding portion of the partition member is gradually reduced in diameter so that the opening area of the second communication hole decreases as the distance from the annular plate portion of the partition member increases. It is preferable.
- the filter preferably has a hollow communication portion extending along the axial direction of the housing, and the hollow communication portion is the working gas of the filter. It is preferable to reach at least the end surface on the generation chamber side.
- the partition member extends continuously from the inner peripheral edge of the annular plate portion toward the hollow communication portion of the filter by covering the end face of the filter with the annular plate portion.
- the cylindrical protrusion part which covers the inner peripheral surface near an end surface is included, and it is preferable that the said 2nd communicating hole is prescribed
- the diameter of the cylindrical projecting portion of the partition member gradually increases so that the opening area of the second communication hole increases as the distance from the annular plate portion of the partition member increases. It is preferable.
- the outer diameter of the first housing member and the outer diameter of the second housing member are the same.
- Embodiment 1 of this invention It is a front view of the cylinder type gas generator in Embodiment 1 of this invention. It is a right view of the cylinder type gas generator in Embodiment 1 of this invention. It is a schematic cross section of the cylinder type gas generator in Embodiment 1 of the present invention. It is a schematic cross section which shows the filling and sealing process of the gas generating agent at the time of manufacturing the cylinder type gas generator in Embodiment 1 of this invention. It is a schematic cross section which shows the filling and sealing process of the gas generating agent at the time of manufacturing the cylinder type gas generator in Embodiment 1 of this invention.
- FIG. 1 It is a schematic cross section which shows the filling and sealing process of the gas generating agent at the time of manufacturing the cylinder type gas generator in Embodiment 1 of this invention. It is a principal part expanded sectional view which expanded the vicinity of the position where the partition member of the cylinder type gas generator in Embodiment 1 of this invention was provided, and is a figure which shows the state immediately after the operation start of a cylinder type gas generator. . It is a principal part expanded sectional view which expanded the vicinity of the position where the partition member of the cylinder type gas generator in Embodiment 1 of this invention was provided, and shows the state after progress for a predetermined time from the operation start of a cylinder type gas generator. FIG.
- FIG. 1 It is a principal part expanded sectional view which expanded the vicinity of the position in which the partition member of the cylinder type gas generator in Embodiment 4 of this invention was provided, and is a figure which shows the state immediately after the operation start of a cylinder type gas generator. . It is a principal part expanded sectional view which expanded the vicinity of the position where the partition member of the cylinder type gas generator in Embodiment 4 of this invention was provided, The state after predetermined time progress from the operation start of a cylinder type gas generator is shown. FIG. It is the principal part enlarged front view which expanded the vicinity of the position in which the gas outlet of the cylinder type gas generator in Embodiment 5 of this invention was provided.
- FIG. 1A and 1B are views showing an external structure of a cylinder type gas generator according to Embodiment 1 of the present invention.
- FIG. 1A is a front view
- FIG. 1B is a right side view.
- FIG. 2 is a diagram showing the internal structure of the cylinder type gas generator in the present embodiment, and is a schematic cross-sectional view taken along the line II-II shown in FIGS. 1A and 1B.
- FIG. 1A, FIG. 1B, and FIG. 2 the external appearance structure and internal structure of the cylinder type gas generator in this Embodiment are demonstrated.
- the cylinder type gas generator 1A in the present embodiment has a long cylindrical outer shape, and is an outer shell member that is closed at both ends in the axial direction.
- a housing as an outer shell member includes a first housing member 10 having a bottomed cylindrical shape with one side in the axial direction having a peripheral wall portion 11 and a bottom wall portion 12 closed, and in the same direction as the axial direction of the first housing member 10. And a cylindrical second housing member (squib holder) 20 having a penetrating portion 23 extending along.
- the second housing member 20 has a later-described caulking fixing groove 21 at a predetermined position on its outer peripheral surface, and the groove 21 extends along the circumferential direction on the outer peripheral surface of the second housing member 20. It is formed in an annular shape.
- the outer diameter of first housing member 10 and the outer diameter of second housing member 20 are configured to be the same.
- the second housing member 20 is fixed to the first housing member 10 so as to close the opening end of the first housing member 10. Specifically, in a state in which a part of the second housing member 20 is inserted into the opening end of the first housing member 10, a portion corresponding to the groove 21 provided on the outer peripheral surface of the second housing member 20.
- the second housing member 20 is caulked and fixed to the first housing member 10 by reducing the diameter of the peripheral wall portion 11 of the first housing member 10 radially inward and engaging with the groove 21.
- one end of the housing in the axial direction is constituted by the second housing member 20, and the other end of the housing in the axial direction is constituted by the bottom wall portion 12 of the first housing member 10. become.
- the caulking fixing is caulking fixing called eight-side caulking in which the diameter of the peripheral wall portion 11 of the first housing member 10 is uniformly reduced toward the inside in the radial direction.
- the caulking portion 14 is provided on the peripheral wall portion 11 of the first housing member 10.
- the 1st housing member 10 may be comprised with metal members, such as stainless steel, steel, aluminum alloy, and a stainless alloy, or by pressing the rolled steel plate represented by SPCC, SPCD, and SPCE.
- metal members such as stainless steel, steel, aluminum alloy, and a stainless alloy
- a molded product formed by cold forging carbon steel typified by SWCH into a bottomed cylindrical shape.
- the first housing member 10 is composed of a press-formed product of a rolled steel plate or a molded product of an electric resistance welded tube, it is cheaper and easier than using a metal member such as stainless steel or steel.
- the first housing member 10 can be formed and the weight can be significantly reduced.
- the 2nd housing member 20 is comprised with metal members, such as stainless steel, steel, an aluminum alloy, and
- a partition member 40 is arranged in a space inside the housing constituted by the first housing member 10 and the second housing member 20.
- the partition member 40 partitions an internal space of the housing into a working gas generation chamber and a filter chamber in the axial direction.
- the working gas generation chamber is located at a substantially central portion in the axial direction of the housing, and a part of a first sealed container 80 described later is accommodated therein.
- the filter chamber is located on the other end side in the axial direction of the housing (that is, on the bottom wall 12 side of the first housing member 10), and a filter 70 described later is accommodated therein.
- an igniter (squib) 30 and a transfer agent (enhancer) 61 as ignition means are arranged at one end of the housing in the axial direction (that is, a portion near the second housing member 20). Yes.
- the igniter 30 and the transfer agent 61 as ignition means are for generating a flame for burning a granular gas generating agent 62 to be described later, and the transfer agent 61 of these is transferred to the second sealed container 90.
- a space inside the housing in which the igniter 30 and the second sealed container 90 are accommodated corresponds to an ignition chamber. That is, the ignition chamber is located in a portion near one end portion in the axial direction of the housing, and is defined by the peripheral wall portion 11 of the first housing member 10, the second housing member 20, and a first sealed container 80 described later. Has been.
- the igniter 30 is inserted into the penetrating portion 23 of the second housing member 20 and fixed by caulking. More specifically, the second housing member 20 has a caulking portion 24 at an end portion facing the space inside the housing, and the igniter 30 is inserted into the through portion 23 so that the second housing member 20 is inserted. By caulking the caulking portion 24 in a state where the igniter 30 is clamped to the second housing member 20, the igniter 30 is clamped by the second housing member 20 and the igniter 30 is fixed to the second housing member 20.
- the igniter 30 is an ignition device for generating a flame, and includes a base portion 31, an ignition portion 32, and a terminal pin 33.
- the base portion 31 is a portion for holding a pair of terminal pins 33 by being inserted therethrough, and is provided adjacent to the ignition portion 32.
- the ignition unit 32 includes an igniting agent that ignites during operation and a resistor for burning the igniting agent.
- the terminal pin 33 is connected to the ignition unit 32 in order to ignite the igniting agent.
- a pair of terminal pins 33 held by the base portion 31 are inserted into the ignition portion 32, and a resistor (bridge wire) is attached so as to connect the tips thereof.
- the ignition part 32 is filled with an ignition agent so as to surround the body or to be in contact with the resistor.
- an ignition agent such as nichrome wire or a resistance wire made of an alloy containing platinum and tungsten is generally used.
- the igniting agent ZPP (zirconium / potassium perchlorate) or ZWPP (zirconium / tungsten / potassium perchlorate) is generally used.
- Lead tricinate and the like are used.
- the squib cup that surrounds the ignition unit 32 is generally made of metal or plastic.
- a predetermined amount of current flows through the resistor via the terminal pin 33.
- 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 3 milliseconds or less when a nichrome wire is used as the resistor.
- the second sealed container 90 includes a bottomed cylindrical cup portion 91 and a cap portion 92 that closes the opening of the cup portion 91.
- the second sealed container 90 is connected to the igniter 30 at a position near one end portion in the axial direction of the housing. Interpolated to connect.
- the cup portion 91 and the cap portion 92 are combined and joined, so that an accommodation space 93 formed inside the second sealed container 90 is formed outside the second sealed container 90. It is hermetically sealed.
- the formed resin member or the like is used.
- brazing, bonding, winding (caulking), or the like is preferably used. If a sealant is used in the joining, the airtightness can be further improved.
- the explosive charge 61 is ignited by a flame generated by the operation of the igniter 30 and burns to generate heat particles.
- the charge transfer agent 61 must be capable of reliably starting the gas generating agent 62 described later, and is generally B / KNO 3 , B / NaNO 3 , Sr (NO 3 ).
- a composition having a high burning rate and a high exothermic property is used, such as a composition composed of metal powder / oxidant represented by 2 etc., and the gas generating agent 62 described later.
- As the explosive charge 61 a powdery one, a one formed into a predetermined shape by a binder, or the like is used.
- Examples of the shape of the charge transfer agent formed by the binder include various shapes such as a granular shape, a columnar shape, a sheet shape, a spherical shape, a single-hole cylindrical shape, a porous cylindrical shape, and a tablet shape.
- As the binder hydrotalcites, nitrocellulose and the like can be preferably used, but are not particularly limited thereto.
- a first cushion material 63 is disposed in the ignition chamber between the second sealed container 90 and the second housing member 20 and in the portion surrounding the ignition unit 32 of the igniter 30.
- the first cushion material 63 is a member for fixing various internal components described later in the axial direction inside the housing, and at the same time, a member for absorbing the variation in the axial length of the internal components described above. But there is. Accordingly, the first cushion material 63 is sandwiched and fixed in the axial direction of the housing by the second sealed container 90 and the second housing member 20 described above.
- the first cushion material 63 for example, a molded body of ceramic fiber, foamed silicon, or the like can be used.
- the first sealed container 80 is disposed in a space adjacent to the space in which the second sealed container 90 is disposed in the space inside the housing.
- the first sealed container 80 includes a bottomed cylindrical cup portion 81 and a cap portion 82 that closes the opening of the cup portion 81, and is inserted into a space inside the housing.
- the storage space 83 formed inside the first sealed container 80 is formed from the outside of the first sealed container 80 by joining the cup part 81 and the cap part 82 together. It is hermetically sealed.
- a metal member formed by pressing a metal thin plate (foil) such as copper, aluminum, a copper alloy, and an aluminum alloy, injection molding, sheet molding, etc.
- the formed resin member or the like is used.
- brazing, bonding, winding (caulking) or the like is preferably used. If a sealant is used in the joining, the airtightness can be further improved.
- the granular gas generating agent 62, the partition member 50, and the second cushion material 64 are accommodated. More specifically, the second cushion material 64 is disposed at the end portion of the first sealed container 80 on the side where the second sealed container 90 is located, and the portion where the second cushion material 64 is disposed is arranged.
- the gas generating agent 62 and the partition member 50 are disposed in the portion other than the portion.
- the working gas generation chamber described above is configured by a space defined by the peripheral wall portion 11 of the first housing member 10, the second cushion member 64, and a partition member 40 described later. The working gas generation chamber is further partitioned into two spaces by the partition member 50 accommodated therein.
- the partition member 50 is configured by a bottomed cylindrical member having a hollow portion 55 inside and closed at one end, and includes a flange portion 51, a cylindrical portion 52 as a cylindrical portion, and a bottom portion 53.
- the flange 51 is disposed at the end of the first sealed container 80 on the partition member 40 side, and the main surface of the flange 51 on the partition member 40 side is the axial direction of the first sealed container 80 on the partition member 40 side. It is in contact with the end 81a.
- the cylindrical portion 52 has a cylindrical shape extending in a straight tube shape having a constant inner diameter and outer diameter along the axial direction of the housing, and extends continuously from the inner peripheral edge of the flange portion 51.
- the bottom 53 extends continuously from the cylindrical portion 52 and closes the end of the cylindrical portion 52 on the igniter 30 side.
- the bottom 53 is arranged at a predetermined distance from the end of the first sealed container 80 on the igniter 30 side, and has a tapered shape whose outer shape gradually decreases toward the igniter 30 side. is doing.
- the axial length of the partition member 50 is preferably 40% or more and 90% or less of the axial length of the first sealed container 80, and more preferably the axial length of the first sealed container 80. 70% or more and 85% or less.
- the above-described granular gas generating agent 62 is accommodated in a portion excluding the hollow portion 55 of the partition member 50. That is, the gas generating agent 62 includes a space surrounding the cylindrical portion 52 and the bottom portion 53 of the partition member 50 in the radial direction in the working gas generation chamber, and the partition member 50 and the second cushion material 64 along the axial direction of the housing. And a space located between the two.
- the granular gas generating agent 62 is ignited by the hot particles generated by burning the transfer charge 61 ignited by the igniter 30, and generates gas by burning.
- Each of the granular gas generating agents 62 is generally formed as a molded body containing a fuel, an oxidant, and an additive.
- a fuel for example, a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, or a combination thereof is used.
- 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.
- 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.
- the nitrate for example, sodium nitrate, potassium nitrate and the like are preferably used.
- examples of the additive include a binder, a slag forming agent, and a combustion adjusting agent.
- 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 acid clay can be suitably used.
- slag forming agent silicon nitride, silica, acid clay, etc. can be suitably used.
- a metal oxide, ferrosilicon, activated carbon, graphite, etc. can be used suitably.
- each gas generating agent 62 formed in a granular shape there are various shapes such as a granular shape, a pellet shape, a columnar shape, and a disk shape.
- a molded body having a porous shape for example, a single-hole cylindrical shape or a porous cylindrical shape
- These shapes are preferably selected as appropriate according to the specifications of the airbag apparatus in which the cylinder type gas generator 1A is incorporated.
- the gas generating agent 62 when the gas generating agent 62 is burned, the generation rate of the working gas changes with time. It is preferable to select an optimum shape according to the specification, such as selecting a shape.
- the granular gas generating agent 62 it is particularly preferable to use a gas containing a guanidine compound as a fuel and containing basic copper nitrate as an oxidizing agent. If a gas generant containing this guanidine compound and basic copper nitrate is used, there will be no toxicity problem as in the case of an azide compound, and the combustion temperature will be lower than the melting point of slag. Slag can be effectively captured by the filter 70 as a solid matter.
- the cylindrical part 52 of the partition member 50 is provided with a plurality of first communication holes 54 along the circumferential direction and the axial direction.
- the first communication hole 54 is a hole for communicating the space in which the granular gas generating agent 62 is accommodated with the hollow portion 55 of the partition member 50, and is configured by a hole having a smaller diameter than the granular gas generating agent 62.
- the first communication hole 54 is preferably not provided in the bottom 53 of the partition member 50. This is because if the first communication hole 54 exists in the bottom portion 53, the hole is blocked during the operation of the cylinder type gas generator 1 ⁇ / b> A, and the performance is likely to vary.
- the partition member 50 functions as a pressure partition for creating a pressure difference between the hollow portion 55 and the space in which the granular gas generating agent 62 is accommodated during operation, and has a predetermined strength. It is comprised by the member.
- the partition member 50 is made of a metal member such as stainless steel, steel, an aluminum alloy, or a stainless alloy.
- the second cushion material 64 corresponds to a crushing prevention member for preventing the gas generating agent 62 made of a molded body from being crushed by vibration or the like, and preferably a ceramic fiber molded body or foamed silicon is used.
- the second cushion material 64 is opened or divided by the combustion of the charge transfer 61 at the time of operation, and may be burned out in some cases.
- the gas generating agent 62 and the transfer agent 61 are sealed in the first sealed container 80 and the second sealed container 90, respectively.
- the partition member 50 and the second cushion material 64 are sealed in the first sealed container 80 in addition to the gas generating agent 62, the cylinder type gas is used. An effect of further facilitating the assembly operation of the generator 1A can also be obtained.
- the partition member 40 partitions the space inside the housing into the working gas generation chamber and the filter chamber in the axial direction.
- the partition member 40 is disposed so as to be in contact with the first sealed container 80 described above in the space inside the housing, and has an annular plate portion 41, a cylindrical projecting portion 42, and a second communication hole 43. Yes.
- the annular plate portion 41 is disposed in contact with the first sealed container 80 so as to be orthogonal to the axis of the housing.
- the cylindrical projecting portion 42 extends continuously from the inner peripheral edge of the annular plate portion 41 and is located so as to project in a direction away from the first sealed container 80 described above.
- the second communication hole 43 is defined by the cylindrical protrusion 42 and is a hole for communicating the hollow portion 55 of the partition member 50 and the filter chamber.
- the partition member 40 is fitted or loosely fitted to the housing, and the housing is not subjected to caulking processing for fixing the partition member 40.
- the fitting includes so-called press-fitting and refers to a state in which the outer peripheral end of the annular plate portion 41 of the partition member 40 is attached in a state of being in contact with the inner peripheral surface of the housing.
- loose fitting refers to a state in which the outer peripheral end of the annular plate portion 41 of the partition member 40 and the inner peripheral surface of the housing are not necessarily in contact with each other over the entire circumference, and are inserted with a slight gap (play). . From the viewpoint of facilitating assembly, it is preferable that the partition member 41 is loosely fitted in the housing.
- the partition member 40 is attached to an end portion of the filter 70 to be described later on the working gas generation chamber side, and is sandwiched between the filter 70 and the first sealed container 80 that stores the granular gas generating agent 62 described above. Is supported inside.
- the partition member 40 is formed by, for example, pressing a metal plate-like member such as stainless steel, steel, an aluminum alloy, or a stainless alloy.
- a filter 70 is disposed in a filter chamber defined by the peripheral wall portion 11 and the bottom wall portion 12 of the first housing member 10 and the partition member 40.
- the filter chamber in which the filter 70 is accommodated is provided adjacent to the working gas generation chamber via the partition member 40, and is located on the other end side of the housing with respect to the working gas generation chamber (that is, the bottom wall of the first housing member 10). Part 12 side).
- the filter 70 is formed of a cylindrical member having a hollow communication portion 71 that extends along the same direction as the axial direction of the housing and reaches the axial end surface thereof, and the end surface on the side of the working gas generation chamber in the axial direction is the partition member 40. The other end surface is in contact with the bottom wall portion 12 of the first housing member 10. The outer peripheral surface of the filter 70 is in contact with the inner peripheral surface of the peripheral wall portion 11 of the first housing member 10.
- the filter 70 is, for example, one obtained by winding and sintering a metal wire such as stainless steel or steel, one obtained by pressing a net material knitted with a metal wire, or by winding a perforated metal plate. Things are used.
- a metal wire such as stainless steel or steel
- a net material specifically, a knit metal mesh, a plain weave metal mesh, an assembly of crimped metal wires, or the like is used.
- 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.
- 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.
- a metal plate a steel plate (mild steel), a stainless steel plate, for example can be used suitably, and nonferrous metal plates, such as aluminum, copper, titanium, nickel, or these alloys, can also be utilized.
- a filter formed by winding or sintering metal wires or nets in a cylindrical shape, or a filter composed of expanded metal, hook metal, etc. has a void inside. Will be included, allowing the working gas flow described above.
- the filter 70 functions as a cooling means that cools the working gas by taking away the high-temperature heat of the working gas. It also functions as a removing means for removing residues (slag) and the like contained in the gas.
- a gas outlet 13 is provided in the peripheral wall portion 11 of the first housing member 10 that defines the filter chamber.
- the gas outlet 13 is a hole for releasing the working gas generated inside the cylinder type gas generator 1 ⁇ / b> A to the outside, and extends along the circumferential direction and the axial direction of the peripheral wall portion 11 of the first housing member 10. A plurality are provided.
- a female connector (not shown) is attached to the end of the cylinder type gas generator 1A on the side where the second housing member 20 is disposed. More specifically, there is a female connector in which a male connector of a harness for transmitting a signal from a collision detection sensor provided separately from the cylinder type gas generator 1A is connected to a recess 22 provided in the second housing member 20. Mounted. 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, when the male connector of the harness is inserted into the female connector, the contact with the terminal pin 33 is released.
- the operation during the operation of the cylinder type gas generator 1A described above will be described with reference to FIG.
- 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.
- the igniter 30 is activated, the pressure in the igniter 32 is increased due to combustion of the igniting agent, whereby the igniter 32 is ruptured and the flame flows out of the igniter 32.
- the transfer charge 61 accommodated in the 2nd airtight container 90 is ignited and burned by the flame produced when the igniter 30 act
- the large amount of generated heat particles melts or ruptures the cap portion 82 of the first sealed container 80, opens or divides the second cushion material 64, and flows into the working gas generation chamber.
- the hot particles flowing into the working gas generation chamber ignite and burn the granular gas generating agent 62 sequentially from the side where the igniter 30 is located, thereby generating a large amount of working gas.
- the working gas generated in this manner passes through the first communication hole 54 provided in the partition member 50 and flows into the hollow portion 55 of the partition member 50, and the cup of the first sealed container 80 positioned at the end thereof.
- the axial end portion 81 a of the portion 81 is ruptured and flows into the filter chamber via the second communication hole 43 provided in the partition member 40.
- the working gas that has flowed into the filter chamber enters the filter 70 via the hollow communication portion 71 of the filter 70, passes through the filter 70, is cooled to a predetermined temperature, and is discharged from the gas outlet 13. It is ejected to the outside of the cylinder type gas generator 1A. The working gas ejected from the gas ejection port 13 is guided into the airbag to inflate and deploy the airbag.
- the gas generating agent 62 at a portion located between the partition member 50 and the second cushion material 64 in the initial stage of combustion of the granular gas generating agent 62. are combusted sequentially from the side where the second cushion material 64 is located, and the internal pressure of the portion excluding the hollow portion 55 of the working gas generation chamber rises rapidly so that the gas generating agent 62 is combusted.
- the combustion of the gas generating agent 62 is promoted, and the working gas is provided in the cylindrical portion 52 of the partition member 50 without hindering the flow of the working gas by the unburned gas generating agent 62. It flows into the hollow portion 55 via the communication hole 54.
- the portion of the gas generating agent 62 located in the space surrounding the cylindrical portion 52 of the partition member 50 is from the side where the second cushion material 64 is positioned.
- Sequential combustion is performed, the working gas is stably generated while maintaining the internal pressure of the working gas generation chamber except for the hollow portion 55, and the flow of the generated working gas is inhibited by the unburned gas generating agent 62.
- the working gas flows into the hollow portion 55 via the first communication hole 54 provided in the cylindrical portion 52 of the partition member 50 without any problem.
- the working gas generation chamber and the filter chamber are arranged so as to be aligned along the axial direction of the housing.
- the working gas generated by the combustion of the gas generating agent 62 flows into the hollow portion 55 of the partition member 50 via the first communication hole 54 provided in the partition member 50.
- the air flows from the axial end of the partition member 50 on the filter chamber side into the filter chamber via the second communication hole 43 of the partition member 40. Therefore, if it is set as the airbag apparatus provided with the said cylinder type gas generator 1A, an airbag can be gradually expanded.
- the gas generating agent 62 is accommodated in the working gas generation chamber in the portion excluding the hollow portion 55 of the partition member 50.
- the ignited gas generating agent 62 is sequentially combusted from the igniter 30 side to generate a working gas, and the generated working gas is quickly supplied to the partition member via the first communication hole 54 provided in the partition member 50. 50 flows into the hollow portion 55 and moves to the filter chamber. Therefore, by adopting this configuration, it is possible to prevent the unburned gas generating agent from becoming the flow resistance of the working gas, and to obtain a cylinder type gas generator having excellent output characteristics.
- the function of the partition member 50 prevents the unburned gas generating agent from becoming the flow resistance of the working gas.
- a cylinder type gas generator capable of obtaining stable output characteristics can be obtained.
- the filling amount of the gas generating agent 62 in a portion located between the partition member 50 and the second cushion material 64 is predetermined. It is extremely important to accurately adjust the amount. This is because, when the filling amount of the gas generating agent 62 in the portion is insufficient, the internal pressure rise in the portion excluding the hollow portion 55 of the working gas generation chamber is not sufficient in the initial stage of combustion, and as a result, the subsequent gas generation This is because the combustion state of the agent 62 is greatly affected, and as a result, desired output characteristics cannot be obtained.
- the partition member 50 is divided into the cylindrical portion 52 having the first communication hole 54 and the bottom portion 53 not having the first communication hole 54.
- the bottom 53 is configured to have a tapered shape in which the outer shape gradually decreases toward the igniter 30, so that the portion located between the partition member 50 and the second cushion material 64 is configured. It is possible to accurately adjust the filling amount of the gas generating agent 62 to be a predetermined amount. This point will be described in detail below.
- FIG. 3A to FIG. 3C are schematic cross-sectional views showing the filling and sealing process of the gas generating agent in the first sealed container when manufacturing the cylinder type gas generator in the present embodiment.
- the bottom 53 of the partition member 50 is located on the igniter 30 side (in the subassembly shown in FIG. 3C, the cap portion 82).
- the outer surface of the bottom 53 is configured to have a hemispherical shape so that its outer shape gradually decreases as it goes to the side). Note that the outer surface of the bottom 53 is not necessarily a hemispherical shape, and may be any shape as long as the outer shape of the bottom 53 is a tapered shape.
- a bottomed cylindrical shape that becomes a part of the first sealed container 80 is formed.
- the cup part 81 is prepared, and the partition member 50 is arranged inside the cup part 81. More specifically, the partition member 50 is inserted into the cup portion 81 through the opening of the cup portion 81, and the flange portion 51 of the partition member 50 abuts on the axial end portion 81 a that is the bottom wall of the cup portion 81.
- a predetermined amount of the granular gas generating agent 62 is filled into the space inside the cup portion 81.
- the granular gas generating agent 62 introduced into the cup part 81 passes through the bottom 53 of the partition member 50 and smoothly falls into the space surrounding the partition member 50 inside the cup part 81. Is housed in.
- the granular gas generating agent 62 is further filled so as to cover the space and the bottom 53.
- the granular gas generating agent 62 is more densely filled with no gap, for example, by gently vibrating the cup portion 81. However, when vibration is applied to the cup portion 81, it is necessary to make the vibration sufficiently weak so that the granular gas generating agent 62 is not crushed.
- the second cushion material 64 is placed so as to cover the upper surface of the filled granular gas generating agent 62, and the cap of the cup portion 81 is closed from above.
- the part 82 is assembled, and the space inside the cup part 81 is hermetically sealed from the outside.
- brazing, bonding, winding (caulking), or the like is preferably used, and more preferably, joining using a sealant is used.
- the cap portion 82 is shown in the figure in the cup portion 81. Assemble with the load F1 pressed. At this time, the load F1 applied to the granular gas generating agent 62 is dispersed as shown in the figure along the curved surface because the bottom 53 of the partition member 50 has a smooth curved shape. Therefore, the gas generating agent 62 located on the bottom 53 moves smoothly along the curved surface. Therefore, the filling amount of the gas generating agent 62 in the portion located between the partition member 50 and the second cushion material 64 can be accurately adjusted so as to be a predetermined amount. In this way, it is possible to prevent a load from being applied to the granular gas generating agent 62 and to prevent the gas generating agent 62 from being sandwiched between the cap portion 82 and the bottom portion 53 and being crushed.
- the filling amount of the gas generating agent 62 in a portion located between the partition member 50 and the second cushion material 64 becomes a predetermined amount. It is possible to adjust with high accuracy, and it is possible to prevent the gas generating agent 62 from being crushed during filling, and as a result, a compact and lightweight cylinder type that can stably obtain desired output characteristics. It can be a gas generator.
- the gas generating agent 62 is sealed in the first sealed container 80 and the transfer charge 61 is sealed in the second sealed container 90, respectively. Therefore, it is not necessary to apply a sealing process to the housing for hermetically sealing the gas generating agent 62 and the charge transfer agent 61, so that the outer shape of the housing is reduced by that amount (that is, the diameter is reduced or shortened).
- the pressure resistance can be improved by increasing the wall thickness of the housing, and as a result, a cylinder type gas generator having a structure advantageous for downsizing and high pressure resistance can be obtained. it can.
- the working gas generated in the working gas generation chamber does not flow in the axial direction of the housing but flows in the radial direction of the housing. Since it flows into the hollow portion 55 of the partition member 50 via the communication hole 54 and then flows into the filter chamber via the second communication hole 43, the gas generating agent during combustion or unburned gas The amount of solid residue generated when the generating agent is destroyed by the flow of the working gas is greatly suppressed, and the solid residue is further broken down by the flow of the working gas to become a minute residue. As a result, the load on the filter 70 is greatly reduced. Therefore, since the partition member 50 also has a filter function for removing a part of the residue, the filter 70 can be reduced in size, and a small and lightweight cylinder-type gas generator can be obtained. be able to.
- the R1 when the outer diameter of the first housing member 10 is R1, the R1 is 15 mm ⁇ R1 ⁇ 22 mm. It is preferable that the condition is satisfied, and more preferably, the condition of 15 mm ⁇ R1 ⁇ 20 mm is satisfied.
- the end of the partition member 50 on the igniter 30 side of the working gas generation chamber from the end of the bottom 53 of the partition member 50 on the igniter 30 side.
- the distance to the end (that is, the portion in contact with the second cushion material 64) (the distance corresponds to the axial length of the working gas generation chamber of the portion where the partition member 50 is not located), and the gas generating agent 62
- L2 be the axial length of the portion that is filled along the radial direction of the working gas generation chamber, and more specifically, the diameter of the working gas generation chamber (more specifically, the gas generating agent in the working gas generation chamber)
- the diameter of the portion filled with 62 that is, the inner diameter of the first sealed container 80
- these L2 and R2 satisfy the condition of 0.026 ⁇ L2 / R2 ⁇ 0.71. It is preferable.
- the diameter of the hollow portion 55 of the partition member 50 that is, the inner diameter of the cylindrical portion 52 of the partition member 50 is R3.
- R2 and R3 described above satisfy the condition of 0.28 ⁇ R3 / R2 ⁇ 0.54.
- the boundary 53 between the bottom 53 and the cylindrical portion 52 of the partition member 50 is located on the igniter 30 side of the bottom 53.
- the L1 preferably satisfies the condition of 0 mm ⁇ L1 ⁇ 10 mm, and more preferably satisfies the condition of 1 mm ⁇ L1 ⁇ 7 mm. preferable.
- L1 is set to 0 mm, the tapered bottom portion 53 does not exist in the first place, and the efficiency of filling the gas generating agent 62 cannot be improved.
- the combustion of the gas generating agent 62 is promoted even when the first housing member 10 is configured using a press-formed product of a rolled steel plate or a molded product obtained by closing an electric-welded tube.
- the housing can be prevented from being damaged.
- the internal pressure of the working gas generation chamber can be appropriately maintained after the initial stage of combustion of the gas generating agent 62 and after completion of the initial stage.
- unintentional deformation of the first housing member 10 made of a press-formed product of a rolled steel plate or a molded product obtained by closing an electric resistance welded tube can be suppressed.
- the first housing member 10 is configured using a press-formed product of a rolled steel sheet or a molded product obtained by closing an electric-welded tube, a small and light weight that can obtain desired output characteristics by satisfying the above conditions. It can be set as the cylinder type gas generator in which conversion was achieved.
- L2 and R2 described above are L2 / R2 ⁇ 0.026, it has been experimentally confirmed that the maximum internal pressure of the working gas generation chamber is less than 35 MPa. As a result, the desired gas output cannot be obtained, and the airbag may be insufficiently expanded and deployed.
- L2 and R2 described above are 0.71 ⁇ L2 / R2, it has been experimentally confirmed that the maximum internal pressure of the working gas generation chamber exceeds 90 MPa. There is a possibility that unintended deformation may occur in the first housing member 10 formed of a press-formed product of a steel plate or a molded product obtained by closing an electric resistance welded tube. In order to ensure more reliable and stable operation, it is more preferable that the above-described L2 and R2 satisfy the condition of 0.053 ⁇ L2 / R2 ⁇ 0.57.
- R3 and R2 described above satisfy R3 / R2 ⁇ 0.28, it has been experimentally confirmed that the maximum internal pressure of the working gas generation chamber exceeds 90 MPa. There is a possibility that unintended deformation may occur in the first housing member 10 formed of a press-formed product of a steel plate or a molded product obtained by closing an electric resistance welded tube.
- R3 and R2 described above are 0.54 ⁇ R3 / R2, it has been experimentally confirmed that the maximum internal pressure of the working gas generation chamber is less than 35 MPa. There is a risk that the desired gas output cannot be obtained and the airbag may not be sufficiently expanded and deployed, and it is difficult to sufficiently fill the gas generating agent 62.
- R3 and R2 described above satisfy the condition of 0.32 ⁇ R3 / R2 ⁇ 0.43.
- the internal pressure of the working gas generation chamber is maintained in a high pressure environment in which combustion of the gas generating agent 62 is appropriately promoted during operation.
- the amount of residue generated when the gas generating agent 62 burns can be appropriately reduced.
- the shape and assembly structure of partition member 40 and the shape and assembly structure of filter 70 can be configured as described below.
- the cylindrical protrusion 42 of the partition member 40 that partitions the working gas generation chamber and the filter chamber moves away from the annular plate portion 41 (from the working gas generation chamber). It is configured in a conical plate shape gradually reduced in diameter so that the opening area of the second communication hole 43 defined by the cylindrical projecting portion 42 decreases as it moves away and toward the tip of the cylindrical projecting portion 42. And is fitted or loosely fitted to the housing. Therefore, the first housing member 10 is not subjected to caulking for fixing the partition member 40. Therefore, in the cylinder type gas generator 1A in the present embodiment, the assembly can be easily performed as compared with the conventional case.
- the reason why the partition member 40 functions sufficiently even when such an assembly structure is employed will be described.
- FIG. 4A and 4B are enlarged cross-sectional views of the main part, in which the vicinity of the position where the partition member of the cylinder type gas generator in the present embodiment is provided, and FIG. 4A shows the start of operation of the cylinder type gas generator.
- FIG. 4B is a diagram showing a state immediately after, and FIG. 4B is a diagram showing a state after a predetermined time has elapsed from the start of operation. 4A and 4B, the flow direction of the working gas is indicated by an arrow G, and a specific illustration of the working gas generation chamber is omitted.
- the thrust of the high-temperature and high-pressure working gas generated in the working gas generation chamber (that is, the increase in the internal pressure of the working gas generation chamber).
- the annular plate portion 41 of the partition member 40 receives a force (force indicated by an arrow A in the drawing) toward the filter 70 along the axial direction of the housing.
- the annular plate portion 41 of the partition member 40 starts moving toward the filter 70 side, and the portion of the filter 70 surrounded by the partition member 40 and the housing (that is, the working gas generation chamber side of the filter 70).
- the portion in the vicinity of the end portion, the portion included in the region B1 shown in the drawing) is compressed along the axial direction of the housing as the annular plate portion 41 moves.
- the filter 70 there is a void formed as a result of the filter 70 being formed by winding or pressing a metal wire or a net material knitted with a metal wire, or by pressing and compacting.
- the volume of the gap decreases with the movement of the annular plate portion 41, the metal wire is more densely filled in the region B1, and along the radial direction of the housing.
- a force is generated to push the cylindrical protrusion 42 of the partition member 40 inward along the radial direction of the housing in an attempt to spread.
- a force (a force indicated by an arrow C in the drawing) toward the outside along the generally radial direction of the housing is applied to the cylindrical projecting portion 42 of the partition member 40 as the internal pressure increases.
- the force to push the cylindrical projecting portion 42 of the partition member 40 inward along the radial direction of the housing is defeated by the force, and the reaction force (the force indicated by the arrow D in the figure) is the housing. And a contact portion (region E shown in the drawing) between the filter 70 and the filter 70.
- a frictional force is generated at a contact portion between the housing and the filter 70, and the frictional force becomes a braking force that suppresses the partition member 40 from further moving toward the filter 70 side.
- the reaction force acts as a force acting in a direction intersecting the radial direction and the axial direction of the housing, and thus prevents the partition member 40 from moving over a wide range of the housing. Therefore, the amount of movement of the partition member 40 remains small based on the braking force. Therefore, the filter 70 is reliably protected by the partition member 40, and the filter 70 can be prevented from being damaged. Moreover, since the outer edge of the partition member 40 and the inner peripheral surface of the housing are in pressure contact with each other, the working gas is discharged from the gas outlet 13 to the outside of the housing through the portion without passing through the filter 70. The so-called bypass phenomenon can also be reliably prevented.
- the cylindrical protrusion 42 of the partition member 40 is configured to cover only the vicinity of the end of the filter 70 on the working gas generation chamber side. Therefore, a state where a sufficient gap is formed is maintained in the portion of the filter 70 located in the region B2 shown in FIG. 4B, and is affected by the movement and deformation of the partition member 40 described above. Therefore, the working gas can flow smoothly in the portion. Therefore, the cooling function of the working gas and the slag collecting function of the filter 70 are not impaired.
- the inner edge of the projection region of the filter 70 Is configured so as not to be located inside the inner edge of the projection area of the partition member 40. That is, when the partition member 40 and the filter 70 are viewed in plan from the working gas generation chamber side, the relative positional relationship between the partition member 40 and the filter 70 is adjusted so that the filter 70 is completely covered by the partition member 40. ing. With this configuration, the high-temperature and high-pressure working gas that has passed through the second communication hole 43 of the partition member 40 flows along the inner peripheral surface of the filter 70, so that the working gas directly enters the filter 70. The ratio of spraying can be greatly reduced.
- the partition member 40 is held by the filter 70 in the portion located in the above-described region B1 during operation. Therefore, the cylinder type gas generator 1A is operated only by the partition member 40. It is not necessary to design the partition member 40 so that it can withstand the thrust force of the gas, and the thickness can be reduced as compared with the conventional case. Specifically, in consideration of the specifications of a general cylinder type gas generator, when a steel material is used as the partition member 40, it is sufficient that the thickness is approximately 0.7 mm or more.
- FIG. 5 is a schematic cross-sectional view showing the configuration of the cylinder type gas generator according to the example used in the verification test
- FIG. 6 shows the configuration of the cylinder type gas generator according to the comparative example used in the verification test. It is a schematic cross section.
- the cylinder type gas generator 1A has the structure shown in the first embodiment of the present invention described above.
- a pressure sensor SE is attached to a predetermined position of the first housing member 10 so that the internal pressure of the working gas generation chamber during operation can be measured.
- the pressure sensor SE a strain gauge type is used, and the pressure sensor SE is attached to the first housing member 10 at an opening portion and a sensor assembly at a predetermined position of the peripheral wall portion 11 of the first housing member 10.
- the attachment port MP was provided, and the pressure sensor SE was attached to each sensor assembly port MP so as to close the opening. Thereby, the pressure-sensitive surface of the pressure sensor SE is in a state facing the working gas generation chamber.
- a molded product obtained by closing one end of an axial direction end of an electric-welded pipe represented by STKM as the first housing member 10 was used.
- the axial length of the cylinder type gas generator 1A is 83 mm.
- the axial length of the first housing member 10 is 78 mm, and the outer diameter R1 of the first housing member 10 is ⁇ 20 mm.
- the diameter R2 of the working gas generation chamber is ⁇ 16 mm, and the axial length of the working gas generation chamber is 40 mm.
- the distance L1 from the boundary between the bottom 53 and the cylindrical portion 52 in the partition member 50 to the end of the bottom 53 on the igniter 30 side is 4.7 mm, and the end of the bottom 53 on the igniter 30 side
- the distance L2 from the end of the working gas generation chamber to the igniter 30 side is 7 mm.
- the thickness of the second cushion material 64 is 1.5 mm.
- the axial length of the partition member 50 is 31.5 mm, and the diameter R3 of the hollow portion 55 is ⁇ 6 mm.
- a total of 24 first communication holes 54 are provided in the cylindrical portion 52 of the partition member 50, and four first communication holes are provided per row in the circumferential direction of the cylindrical portion 52 as arrangement positions thereof. The rows are arranged in six rows at a pitch of 4.4 mm in the axial direction of the cylindrical portion 52.
- Each of the first communication holes 54 is a ⁇ 2 mm round hole.
- the gas generating agent 62 filled in the working gas generation chamber 56.2 parts by weight of guanidine nitrate, 33.8 parts by weight of basic copper nitrate, 10.0 parts by weight of potassium perchlorate, 0.4 weight of highly dispersed silica Parts are dry-mixed, and then 11.0 parts by weight of 0.6 parts by weight of polyvinyl alcohol aqueous solution is added by spraying to perform wet granulation to obtain granules having a particle size of 1 mm or less, which are heat-treated at 90 ° C. for 15 hours.
- the cylinder type gas generator 1 ⁇ / b> X according to the comparative example has the structure shown in the first embodiment of the present invention described above except for the bottom 53 of the partition member 50.
- the bottom 53 is configured in a flat plate shape so that the outer surface of the bottom 53 of the partition member 50 has a planar shape.
- the pressure sensor SE is attached to a predetermined position of the first housing member 10 so that the internal pressure of the working gas generation chamber at the time of operation can be measured.
- the type of pressure sensor SE and its mounting structure are the same as those of the cylinder type gas generator 1A according to the above-described embodiment.
- the cylinder type gas generator 1X a molded product obtained by closing one end of the axial direction end of the electric resistance welding pipe represented by STKM as the first housing member 10 was used.
- the axial length of the cylinder type gas generator 1X is 83 mm.
- the axial length of the first housing member 10 is 78 mm, and the outer diameter R1 of the first housing member 10 is ⁇ 20 mm.
- the diameter R2 of the working gas generation chamber is ⁇ 16 mm, and the axial length of the working gas generation chamber is 40 mm.
- the bottom 53 of the partition member 50 has a flat shape, and does not have a tapered shape like the cylinder type gas generator 1A according to the above-described embodiment.
- the distance L2 from the end of the partition member 50 on the igniter 30 side to the end of the working gas generation chamber on the igniter 30 side is 7 mm.
- the thickness of the second cushion material 64 is 1.4 mm.
- the axial length of the partition member 50 is 31.6 mm, and the diameter R3 of the hollow portion 55 is ⁇ 6 mm.
- a total of 24 first communication holes 54 are provided in the cylindrical portion 52 of the partition member 50, and four first communication holes are provided per row in the circumferential direction of the cylindrical portion 52 as arrangement positions thereof. The rows are arranged in six rows at a pitch of 4.4 mm in the axial direction of the cylindrical portion 52.
- Each of the first communication holes 54 is a ⁇ 2 mm round hole.
- the gas generating agent 62 filled in the working gas generation chamber is the same as that used in the cylinder type gas generator 1A according to the above-described embodiment, and the total amount thereof is also the cylinder according to the above-described embodiment.
- the total amount of the generated working gas was 0.2 mol and the weight thereof was 6.57 g.
- each sample is placed in a hermetically sealed tank of a predetermined capacity, and the sample is operated to perform tank pressure and operation at that time.
- the performance of each sample was evaluated by measuring the internal pressure of the gas generation chamber over time, and the degree of variation between samples was confirmed based on the evaluation result.
- the capacity of the tank used is 1 cubic foot (about 28.3 liters).
- the ambient temperature in the tank was set to a low temperature environment (about -40 ° C), a room temperature environment (about 23 ° C), and a high temperature environment (about 85 ° C), respectively, and the sample temperature matched the ambient temperature. After confirming, the sample was activated.
- FIG. 7 is a graph for explaining various parameters measured in the verification test. Next, various parameters measured will be described with reference to FIG. In the graph shown in FIG. 7, the horizontal axis represents time, and the vertical axis represents the tank pressure and the internal pressure of the working gas generation chamber (hereinafter also simply referred to as “internal pressure”).
- the Pt10 and the T Pmax are indices used to evaluate the inflation rate of the airbag in the airbag device when the cylinder-type gas generator is incorporated in the airbag device.
- Pmax is an index used to evaluate the cushioning performance after the airbag is inflated.
- the pmax is an index used for evaluating the combustion characteristics of the gas generating agent in the cylinder type gas generator.
- FIG. 8 is a table showing the test results of the verification test
- FIGS. 9 to 12 are graphs showing the results of the verification test.
- FIG. 9 shows the dispersion
- FIG. 10 shows the cylinder type gas generator which concerns on a comparative example and an example. It shows the variation of the Pmax between samples.
- FIG. 11 shows the dispersion
- FIG. 12 shows the cylinder type gas generator which concerns on a comparative example and an example. It shows the variation of the pmax between samples.
- the cylinder type gas generator 1 ⁇ / b> A has a lower temperature environment, a room temperature environment, and a higher temperature environment than the cylinder type gas generator 1 ⁇ / b> X according to the comparative example.
- the Pmax the variation between samples of the T Pmax and the pmax is suppressed.
- the cylindrical gas generator 1A according to the embodiment the Pt10, between samples of the Pmax and the T Pmax
- the range of variation is suppressed to about 1 ⁇ 2 to ⁇ ⁇ , and as a result, the standard deviation ⁇ is a smaller value. Therefore, from the test results of the verification test, it was experimentally confirmed that by adopting the present invention, it is possible to obtain a compact and lightweight cylinder type gas generator that can stably obtain desired output characteristics. .
- FIG. 13 is a schematic cross-sectional view of a cylinder type gas generator according to Embodiment 2 of the present invention. Below, with reference to this FIG. 13, the cylinder type gas generator in this Embodiment is demonstrated. In addition, the same code
- the flow rate of the working gas ejected from the gas outlet and the internal pressure of the working gas generation chamber that needs to be maintained in order to sustain the combustion of the gas generating agent are applied to the working gas generation chamber.
- the amount of working gas generated in this way and the cross-sectional area of the flow path on the flow path through which the working gas flows are generally determined. That is, the flow rate of the working gas and the internal pressure of the working gas generation chamber are restricted in the portion having the smallest cross-sectional area in the working gas flow path, and therefore, how large is the cross-sectional area of the working gas flow path? This is an important factor in determining the performance of the cylinder type gas generator.
- the second communication hole provided in the partition member that partitions the working gas generation chamber and the filter chamber is a minimum cross-sectional area portion on the working gas flow path, and the second The flow rate of the working gas ejected from the gas ejection port is adjusted by adjusting the size of the opening area of the communication hole.
- the diameter of the second communication hole is approximately the same as the inner diameter of the partition member.
- the cylindrical portion of the partition member 50 extends in a straight tube shape whose inner diameter and outer diameter are constant along the axial direction of the housing.
- the opening shape of the end portion on the partition member 40 side (that is, the shape of the end portion of the hollow portion 55) of the second communication hole 43 provided in the partition member 40 is configured by only the cylindrical portion 52. It was comprised so that it might correspond with an opening shape substantially.
- the flow rate of the working gas ejected from the gas outlet 13 is changed while maintaining the filling amount of the gas generating agent 62, or the working gas generating chamber during operation while maintaining the filling amount of the gas generating agent 62.
- the internal pressure of the partition member 50 is changed, it is necessary to adjust the size of the opening area of the second communication hole 43 provided in the partition member 40 while maintaining the shape of the cylindrical portion of the partition member 50.
- the minimum cross-sectional area portion on the working gas flow path is It becomes not the two communication holes 43 but the end of the partition member 50 on the partition member 40 side, and there arises a problem that it cannot be changed as intended.
- the shape of the partition member 50 is slightly changed and the opening area of the second communication hole 43 provided in the partition member 40 is increased, so that the above problem is solved.
- the cylindrical portion of the partition member 50 has a straight tubular shape whose inner diameter and outer diameter are constant along the axial direction of the housing.
- the opening shape of the end portion of the enlarged diameter portion 52a on the partition member 40 side substantially matches the opening shape of the second communication hole 43 provided in the partition member 40. It is configured as follows.
- the axial direction length of the enlarged diameter part 52a shall be 5 to 20% of the axial direction length of the division member 50. It is preferable.
- the opening shape of the end portion on the partition member 40 side of the enlarged diameter portion 52 a provided in the partition member 50 is approximately the same as the opening shape of the second communication hole 43 provided in the partition member 40.
- the position where the second communication hole 43 is provided is the minimum cross-sectional area portion on the working gas flow path, and as a result, the partition member 40 functions as a pressure partition.
- FIG. 14 is a schematic cross-sectional view of a cylinder type gas generator in Embodiment 3 of the present invention.
- the cylinder type gas generator in this Embodiment is demonstrated.
- symbol is attached
- the bottom 53 of the partition member 50 is configured such that the outer surface of the bottom 53 has a hemispherical shape.
- the outside of the bottom 53 is formed such that the outer shape of the partition member 50 has a tapered shape that gradually decreases toward the igniter 30 side.
- the surface is configured to have a substantially conical shape.
- a cylinder-type gas generator can be used.
- the gas generating agent 62 comes into contact with the tip of the bottom 53 of the partition member 50 and is crushed when the gas generating agent 62 is filled.
- the shape of the tip portion of the bottom 53 is a non-sharp shape (for example, a minimal curved surface shape or a planar shape).
- FIG. 15 is a schematic cross-sectional view of a cylinder type gas generator in Embodiment 4 of the present invention.
- FIG. 16A and FIG. 16B are enlarged cross-sectional views of the main part in which the vicinity of the position where the partition member of the cylinder type gas generator in the present embodiment is provided, and FIG. 16A shows the cylinder type gas generator.
- FIG. 16B is a diagram showing a state immediately after the start of operation
- FIG. 16B is a diagram showing a state after a predetermined time has elapsed since the start of operation. 16A and 16B, the flow direction of the working gas is indicated by an arrow G.
- the cylinder type gas generator in this Embodiment is demonstrated with reference to these FIG. 15, FIG. 16A and FIG. 16B.
- symbol is attached
- the thrust of the high-temperature and high-pressure working gas generated in the working gas generation chamber (that is, the increase in the internal pressure of the working gas generation chamber).
- the annular plate portion 41 of the partition member 40 receives a force (force indicated by an arrow A in the drawing) toward the filter 70 along the axial direction of the housing.
- the annular plate portion 41 of the partition member 40 starts moving toward the filter 70 side, and the portion of the filter 70 surrounded by the partition member 40 and the housing (that is, the working gas generation chamber side of the filter 70).
- the portion in the vicinity of the end portion, the portion included in the region B1 shown in the drawing) is compressed along the axial direction of the housing as the annular plate portion 41 moves.
- the filter 70 there is a void formed as a result of the filter 70 being formed by winding or pressing a metal wire or a net material knitted with a metal wire, or by pressing and compacting.
- the volume of the gap decreases with the movement of the annular plate portion 41, the metal wire is more densely filled in the region B1, and along the radial direction of the housing.
- a force is generated to push the cylindrical protrusion 42 of the partition member 40 inward along the radial direction of the housing in an attempt to spread.
- a force (a force indicated by an arrow C in the drawing) toward the outside along the generally radial direction of the housing is applied to the cylindrical projecting portion 42 of the partition member 40 as the internal pressure increases.
- the force to push the cylindrical projecting portion 42 of the partition member 40 inward along the radial direction of the housing is defeated by the force, and the reaction force (the force indicated by the arrow D in the figure) is the housing. And a contact portion (region E shown in the drawing) between the filter 70 and the filter 70.
- a frictional force is generated at a contact portion between the housing and the filter 70, and the frictional force becomes a braking force that suppresses the partition member 40 from further moving toward the filter 70 side.
- the reaction force acts as a force acting in a direction intersecting the radial direction and the axial direction of the housing, and thus prevents the partition member 40 from moving over a wide range of the housing. Therefore, the amount of movement of the partition member 40 remains small based on the braking force. Therefore, the filter 70 is reliably protected by the partition member 40, and the filter 70 can be prevented from being damaged. Moreover, since the outer edge of the partition member 40 and the inner peripheral surface of the housing are in pressure contact with each other, the working gas is discharged from the gas outlet 13 to the outside of the housing through the portion without passing through the filter 70. The so-called bypass phenomenon can also be reliably prevented.
- the cylindrical protrusion 42 of the partition member 40 is configured to cover only the vicinity of the end portion of the filter 70 on the working gas generation chamber side. Accordingly, a state in which a sufficient gap is formed is maintained in the portion of the filter 70 located in the region B2 shown in FIG. 16B, and is affected by the movement and deformation of the partition member 40 described above. Therefore, the working gas can flow smoothly in the portion. Therefore, the cooling function of the working gas and the slag collecting function of the filter 70 are not impaired.
- the inner edge of the projection region of the filter 70 is obtained. Is configured so as not to be located inside the inner edge of the projection area of the partition member 40. That is, when the partition member 40 and the filter 70 are viewed in plan from the working gas generation chamber side, the relative positional relationship between the partition member 40 and the filter 70 is adjusted so that the filter 70 is completely covered by the partition member 40. ing. With this configuration, the high-temperature and high-pressure working gas that has passed through the second communication hole 43 of the partition member 40 flows along the inner peripheral surface of the filter 70, so that the working gas directly enters the filter 70. The ratio of spraying can be greatly reduced.
- the partition member 40 is held by the portion of the filter 70 located in the above-described region B1 during operation, so that the operation is performed only by the partition member 40. It is not necessary to design the partition member 40 so that it can withstand the thrust force of the gas, and the thickness can be reduced as compared with the conventional case. Specifically, in consideration of the specifications of a general cylinder type gas generator, when a steel material is used as the partition member 40, it is sufficient that the thickness is approximately 0.7 mm or more.
- the partition member 40 and the filter 70 are projected on a plane orthogonal to the axis along the axial direction of the housing, the inner edge of the projection region of the filter 70 is obtained. Is configured to match the inner edge of the projection area of the partition member 40. If comprised in this way, the function of the filter 70 can be acquired to the maximum.
- the cylindrical projecting portion 42 of the partition member 40 is configured in a conical plate shape whose diameter gradually increases as the distance from the annular plate portion 41 increases.
- the filter 70 and the partition member 40 can be integrated in advance. In this way, the number of parts to be assembled at the time of assembly can be reduced, and the manufacturing cost can be reduced as the number of assembling steps decreases.
- FIG. 17A is an enlarged front view of a main part in which the vicinity of the position where the gas outlet of the cylinder type gas generator according to Embodiment 5 of the present invention is provided is enlarged.
- FIG. 17B is an enlarged cross-sectional view of a main part in which the vicinity of the position where the gas outlet of the cylinder type gas generator in the present embodiment is provided is enlarged.
- the peripheral wall portion 11 of the first housing member 10 at a position facing the outer peripheral surface of the filter 70 accommodated in the filter chamber ( That is, a plurality of gas jets 13 are provided in the peripheral wall portion 11) of the first housing member 10 that defines the filter chamber.
- a gas outlet non-forming region S1 in which the gas outlet 13 is not provided, and a gas outlet forming region in which the gas outlet 13 is provided. S2 is included.
- the gas ejection port formation region S2 has two equally spaced gas ejection column rows including a plurality of gas ejection ports 13 provided every 90 ° along the circumferential direction of the first housing member 10 at positions shifted in the axial direction. Has a row.
- the gas outlet formation region S ⁇ b> 2 includes the end on the bottom wall portion 12 side of the gas outlet located closest to the bottom wall portion 12 in the axial direction of the first housing member 10, and the first housing member 10.
- the non-forming region S1 refers to a region of the peripheral wall portion 11 of the first housing member 10 in a portion located on the bottom wall portion 12 side in a region that does not correspond to the gas ejection port forming region S2.
- the gas ejection port non-forming region S1 is located on the peripheral wall portion 11 of the first housing member 10 at a position corresponding to the portion near the axial end surface of the filter 70 including the axial end surface that contacts the bottom wall portion 12. Therefore, the gas ejection port formation region S2 is located on the peripheral wall portion 11 of the first housing member 10 at a portion located closer to the working gas generation chamber than the gas ejection port non-formation region S1. .
- the center position in the axial direction of the gas jet forming region S2 in the axial direction of the first housing member 10 is a predetermined distance from the center position in the axial direction of the filter 70. It is configured so as to be positioned on the working gas generation chamber side in a state where it is offset by only a distance. That is, the center position of the gas ejection port formation region S2 in the axial direction of the first housing member 10 is shifted to the working gas generation chamber side without matching the center position of the filter 70 in the axial direction. As a result, the plurality of gas outlets 13 provided in the first housing member 10 are unevenly distributed on the working gas generation chamber side in a relative positional relationship with the filter 70.
- the cylinder-type gas generator 1E can be compared with the case where the center position of the gas outlet formation region S2 in the axial direction of the first housing member 10 is matched with the center position in the axial direction of the filter 70.
- the gas generated inside the housing can be effectively cooled with high cooling efficiency, and the amount of slag discharged from the gas ejection port 13 can be reduced. The mechanism is described in detail below.
- FIG. 18A is a diagram schematically showing an initial gas flow state during the operation of the cylinder type gas generator in the present embodiment
- FIG. 18B is an operation of the cylinder type gas generator in the present embodiment. It is the figure which showed typically the flow state of the gas after predetermined time passed since the start.
- the high-pressure and high-temperature gas generated in the working gas generation chamber is connected to the second communication of the partition member 40 as indicated by arrows in the drawing. It flows into the hollow communication part 71 of the filter 70 through the hole 43, and most of it linearly extends from the end of the hollow communication part 71 of the filter 70 toward the end of the bottom wall 12 side from the end on the working gas generation chamber side. Proceed to. Then, the gas that has reached the end on the bottom wall 12 side of the hollow communication portion 71 of the filter 70 is blown toward the main surface of the bottom wall 12, and its traveling direction is changed to change the bottom wall 12 of the filter 70. Will flow into the end region H on the side.
- the gas generated at the initial stage of the operation of the cylinder type gas generator 1E tends to include particularly a large amount of slag. For this reason, most of the slag generated at the beginning of the operation is blown onto the main surface of the bottom wall portion 12 by riding on the gas flow at the initial stage of the operation and rebounds on the main surface of the bottom wall portion 12. In the end region H of the filter 70 on the bottom wall portion 12 side, the filter 70 is collected. Accordingly, a large amount of slag accumulates in the end region H of the filter 70 on the bottom wall portion 12 side in the initial stage of operation of the cylinder type gas generator 1E.
- the gas outlet is changed based on the central position in the axial direction of the filter. Since the housing member is uniformly arranged in the axial direction, the gas passing through the end region on the bottom wall side of the filter even in a state after a predetermined time has elapsed since the start of the operation of the cylinder type gas generator. The amount of increases. Therefore, there is a high risk that the slag that has already been collected in the end region of the filter at the beginning of the operation of the cylinder-type gas generator will be pushed out of the filter by the gas flow. Thus, it becomes easy to be discharged to the outside of the housing.
- the plurality of gas jets 13 provided in the first housing member 10 as described above have the working gas in the relative positional relationship with the filter 70. Since it is unevenly distributed on the generation chamber side, the amount of gas passing through the end region H on the bottom wall portion 12 side of the filter 70 in a state after a predetermined time has elapsed since the start of the operation of the cylinder type gas generator 1E. And the outflow of the slag as described above to the outside of the filter 70 can be suppressed. Therefore, by comprising in this way, the quantity of the slag discharged
- the working gas generated inside the gas generator 1E can be effectively cooled with high cooling efficiency, and the gas injection The amount of slag discharged from the outlet 13 can be reduced.
- the opening area of the gas jet 13 is large. There is no shortage. Therefore, the gas generated inside the housing can be efficiently ejected to the outside of the housing.
- the specific arrangement position of the gas outlet 13 is optimized based on various specifications and the like, an example of which is shown below.
- the diameter L3 is set at a position where the distance L4 along the axial direction from the bottom wall portion 12 is 6.5 mm.
- Four 5 mm gas outlets 13 are provided in a row every 90 ° in the circumferential direction, and a gas jet having a diameter of 3.5 mm is provided at a position where the distance L5 along the axial direction is 3.5 mm from the position.
- Four outlets 13 are provided in a row every 90 ° in the circumferential direction.
- the gas outlets 13 provided in each row are arranged in a staggered manner by being arranged at positions shifted by 45 ° in the circumferential direction.
- the axial length of the gas outlet non-forming region S1 shown in FIG. 17A is 4.75 mm, and the axial length of the gas outlet forming region S2 is 7 0.0 mm.
- the axial center position of the filter 70 is a position where the axial distance from the bottom wall portion 12 is 7.5 mm, and the axial center position of the gas ejection port formation region S2 is the axis from the bottom wall portion 12.
- the directional distance is 8.25 mm. Therefore, if comprised in this way, the several gas jet nozzle 13 provided in the 1st housing member 10 will be arrange
- the first housing member 10 one of a press-formed product mainly formed by press-forming a rolled steel plate or an axial end portion of the ERW pipe is subjected to a closing process.
- the first housing member 10 may be formed by drawing and forming a seamless tube. Even when the first housing member 10 is formed of such a seamless tube, the above-described effects can be obtained.
- the igniter 30 is exemplified by using a nichrome wire as a resistor as a heat source. It is also possible to use an igniter that uses Semiconductor Bridge as a heat source. When an igniter that uses the semiconductor bridge as a heat source is used, a cylinder type gas generator that can obtain a gas output more quickly during operation can be obtained.
- the cylinder type gas generator by which the gas generating agent 62 and the transfer agent 61 are accommodated in the 1st airtight container 80 and the 2nd airtight container 90, respectively.
- the gas generating agent 62 and the transfer agent 61 are directly filled in the housing composed of the first housing member 10 and the second housing member 20. It may be configured. However, in that case, it is necessary that an airtight process for preventing the gas generating agent 62 and the transfer agent 61 from absorbing moisture is separately applied to a predetermined portion of the housing.
- or 5 of this invention demonstrated above in order to accelerate
- the charge transfer 61 is not necessarily an essential component, and it is possible to eliminate the need to load the transfer charge 61 by improving the sensitivity of the gas generating agent 62 for starting combustion.
- the said transfer charge 61 can also be integrated and assembled
- or 5 of this invention demonstrated above the cylinder type gas generator formed by connecting the 1st housing member 10 and the 2nd housing member 20 by caulking and fixing is illustrated and demonstrated. However, it is of course possible to use welding for fixing the first housing member 10 and the second housing member 20.
- the shape of the cylindrical protrusion part 42 of the partition member 40 was made into the shape of a conical plate
- the said cylindrical protrusion The shape of the part 42 is not limited to this,
- the cross-sectional shape may be curved.
- the shape of the cylindrical projecting portion 42 is such that the force applied to the cylindrical projecting portion 42 as the internal pressure increases acts in a direction intersecting both the radial direction and the axial direction of the housing. It suffices if the inner peripheral surface of the cylindrical protrusion 42 is not arranged in parallel with the axial direction of the housing.
- the present invention is applied to a cylinder type gas generator incorporated in a side airbag device as an example.
- the scope of application is not limited to this, but it is long like the cylinder-type gas generator and cylinder-type gas generator incorporated in the passenger seat airbag device, curtain airbag device, knee airbag device, etc.
- the present invention can also be applied to a so-called T-shaped gas generator having a gas output portion.
- 1A to 1E, 1X cylinder type gas generator 10 first housing member, 11 peripheral wall portion, 12 bottom wall portion, 13 gas outlet, 14 caulking portion, 20 second housing member, 21 groove, 22 recess, 23 penetration portion 24 caulking part, 30 igniter, 31 base part, 32 ignition part, 33 terminal pin, 40 partition member, 41 annular plate part, 42 cylindrical projection part, 43 second communication hole, 50 partition member, 51 flange part, 52 Cylindrical part, 52a diameter-expanded part, 53 bottom part, 54 first communication hole, 55 hollow part, 61 explosive agent, 62 gas generating agent, 63 first cushion material, 64 second cushion material, 70 filter, 71 hollow communication part 80, first sealed container, 81 cup part, 81a axial end, 82 cap part, 83 accommodating space, 90 second sealed container 91 cup, 92 the cap portion, 93 housing space, MP sensor assembly port, SE pressure sensor.
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Abstract
Description
図1Aおよび図1Bは、本発明の実施の形態1におけるシリンダ型ガス発生器の外観構造を示す図であり、図1Aは正面図、図1Bは右側面図である。図2は、本実施の形態におけるシリンダ型ガス発生器の内部構造を示す図であり、図1Aおよび図1Bに示すII-II線に沿った模式断面図である。以下においては、これら図1A、図1Bおよび図2を参照して、本実施の形態におけるシリンダ型ガス発生器の外観構造および内部構造について説明する。
以下、本発明の効果を検証するために行なった検証試験の内容および結果について詳説する。図5は、検証試験において使用した実施例に係るシリンダ型ガス発生器の構成を示す模式断面図であり、図6は、検証試験において使用した比較例に係るシリンダ型ガス発生器の構成を示す模式断面図である。まず、これら図5および図6を参照して、検証試験において使用したサンプルの構成について説明する。
図13は、本発明の実施の形態2におけるシリンダ型ガス発生器の模式断面図である。以下においては、この図13を参照して、本実施の形態におけるシリンダ型ガス発生器について説明する。なお、上述した本発明の実施の形態1におけるシリンダ型ガス発生器と同様の部分については図中同一の符号を付し、その説明はここでは繰り返さない。
図14は、本発明の実施の形態3におけるシリンダ型ガス発生器の模式断面図である。以下においては、この図14を参照して、本実施の形態におけるシリンダ型ガス発生器について説明する。なお、上述した本発明の実施の形態1におけるシリンダ型ガス発生器と同様の部分については図中同一の符号を付し、その説明はここでは繰り返さない。
図15は、本発明の実施の形態4におけるシリンダ型ガス発生器の模式断面図である。また、図16Aおよび図16Bは、本実施の形態におけるシリンダ型ガス発生器の仕切り部材が設けられた位置の近傍を拡大した要部拡大断面図であり、図16Aは、シリンダ型ガス発生器の作動開始直後の状態を示す図であり、図16Bは、作動開始から所定時間経過後の状態を示す図である。なお、図16Aおよび図16B中においては、作動ガスの流動方向を矢印Gで示している。以下においては、これら図15、図16Aおよび図16Bを参照して、本実施の形態におけるシリンダ型ガス発生器について説明する。なお、上述した本発明の実施の形態1におけるシリンダ型ガス発生器と同様の部分については図中同一の符号を付し、その説明はここでは繰り返さない。
図17Aは、本発明の実施の形態5におけるシリンダ型ガス発生器のガス噴出口が設けられた位置の近傍を拡大した要部拡大正面図である。また、図17Bは、本実施の形態におけるシリンダ型ガス発生器のガス噴出口が設けられた位置の近傍を拡大した要部拡大断面図である。まず、これら図17Aおよび図17Bを参照して、本実施の形態におけるシリンダ型ガス発生器の構成について説明する。なお、上述した本発明の実施の形態4におけるシリンダ型ガス発生器と同様の部分については図中同一の符号を付し、その説明はここでは繰り返さない。
Claims (12)
- ガス発生剤(62)が燃焼することで作動ガスが生成される作動ガス生成室と、前記作動ガス生成室で生成された作動ガスが通過するフィルタ(70)が収容されたフィルタ室とを内部に含み、軸方向の両端が閉塞されてなる長尺円筒状のハウジングと、
前記ハウジングの軸方向の一端部に配置され、前記ガス発生剤(62)を燃焼させるための火炎を発生させる点火手段と、
前記ハウジングの内部に位置し、前記ハウジングの内部の空間を軸方向に前記作動ガス生成室と前記フィルタ室とに仕切る仕切り部材(40)と、
前記作動ガス生成室の内部に位置し、前記作動ガス生成室を区画する区画部材(50)とを備え、
前記フィルタ室は、前記作動ガス生成室よりも前記ハウジングの軸方向の他端部側に位置し、
前記ハウジングの前記フィルタ室を規定する部分の周壁部には、前記フィルタ(70)を通過した作動ガスを外部に噴出するための複数のガス噴出口(13)が設けられ、
前記区画部材(50)は、前記ハウジングと同軸上に配置された内部に中空部(55)を有する有底筒状の部材にて構成され、前記仕切り部材(40)の前記作動ガス生成室側の端部から前記ハウジングの軸方向に沿って延びる筒状部と、前記筒状部の前記点火手段側の端部を閉塞する底部(53)とを含み、
前記区画部材(50)の前記底部(53)は、前記作動ガス生成室の前記点火手段側の端部よりも前記仕切り部材(40)側に位置し、
前記ガス発生剤(62)は、前記区画部材(50)の前記中空部(55)を除く部分の前記作動ガス生成室に収容され、
前記区画部材(50)の前記筒状部には、前記作動ガス生成室の前記ガス発生剤(62)が収容された空間と前記区画部材(50)の前記中空部(55)とを連通する複数の第1連通孔(54)が設けられ、
前記仕切り部材(40)の中央部には、前記区画部材(50)の前記中空部(55)と前記フィルタ室とを連通するための第2連通孔(43)が設けられ、
前記区画部材(50)の前記底部(53)は、前記点火手段側に向かうにつれて徐々にその外形が小さくなる先細り形状を有している、ガス発生器。 - 前記区画部材(50)の前記底部(53)の外表面が、略半球面形状を有している、請求の範囲第1項に記載のガス発生器。
- 前記区画部材(50)の前記底部(53)の外表面が、略円錐面形状を有している、請求の範囲第1項に記載のガス発生器。
- 前記区画部材(50)の前記筒状部は、前記ハウジングの軸方向に沿って内径および外径が一定とされた円筒状部(52)を有し、
前記複数の第1連通孔(53)が、前記区画部材(50)の前記円筒状部(52)に設けられている、請求の範囲第1項に記載のガス発生器。 - 前記区画部材(50)の前記筒状部は、前記円筒状部(52)の前記仕切り部材(40)側の端部から連続して延び、前記仕切り部材(40)側に向かうにつれて徐々に拡径する拡径部(52a)をさらに有する、請求の範囲第4項に記載のガス発生器。
- 前記ハウジングは、前記ハウジングの前記他端部および前記周壁部を構成する長尺有底円筒状の第1ハウジング部材(10)と、前記第1ハウジング部材(10)の開口端を閉塞することで前記ハウジングの前記一端部を構成する第2ハウジング部材(20)とを含み、
前記第1ハウジング部材(10)は、電縫管の軸方向端部の一方をクロージング処理してなる成形品にて構成され、
前記第1ハウジング部材(10)の外径R1が、15mm≦R1≦22mmの条件を充足し、
前記区画部材(50)における前記底部(53)と前記筒状部との境界部分から前記区画部材(50)の前記底部(53)の前記点火手段側の端部までの距離L1が、1mm≦L1≦7mmの条件を充足し、
前記区画部材(50)の前記底部(53)の前記点火手段側の端部から前記作動ガス生成室の前記点火手段側の端部までの距離L2と、前記作動ガス生成室の径R2とが、0.026≦L2/R2≦0.71の条件を充足し、
前記区画部材(50)の前記中空部(55)の径R3と、前記作動ガス生成室の径R2とが、0.28≦R3/R2≦0.54の条件を充足している、請求の範囲第1項に記載のガス発生器。 - 前記ガス発生剤(62)が、燃料としてグアニジン系化合物を含み、酸化剤として塩基性硝酸銅を含む、請求の範囲第1項に記載のガス発生器。
- 振動による前記ガス発生剤(62)の破砕を防止するための破砕防止部材(64)と、
前記ハウジングの内部に位置し、密閉された収容空間(83)を有する第1密閉容器(80)とをさらに備え、
前記ガス発生剤(62)、前記区画部材(50)および前記破砕防止部材(64)が、前記第1密閉容器(80)の前記収容空間(83)に収容されている、請求の範囲第1項に記載のガス発生器。 - 前記ハウジングの内部に位置し、密閉された収容空間(93)を有する第2密閉容器(90)をさらに備え、
前記点火手段は、燃焼することによって火炎を生じさせる点火薬を含む点火器(30)と、前記点火器(30)にて生じた火炎を前記ガス発生剤(62)に伝達するための伝火薬(61)とを含み、
前記伝火薬(61)が、前記第2密閉容器(90)の前記収容空間(93)に収容されている、請求の範囲第8項に記載のガス発生器。 - 前記フィルタ(70)は、前記ハウジングの軸方向に沿って延びる中空連通部(71)を有し、
前記中空連通部(71)は、前記フィルタ(70)の前記作動ガス生成室側の端面に少なくとも達し、
前記仕切り部材(40)は、前記フィルタ(70)の前記端面を覆う環状板部(41)と、前記環状板部(41)の内周縁から前記フィルタ(70)の前記中空連通部(71)内に向けて連続して延びることで前記フィルタ(70)の前記端面寄りの内周面を覆う筒状突出部(42)とを含み、
前記第2連通孔(43)は、前記仕切り部材(40)の前記筒状突出部(42)の内周面によって規定され、
前記仕切り部材(40)の前記筒状突出部(42)は、前記仕切り部材(50)の前記環状板部(41)から遠ざかるにつれて前記第2連通孔(43)の開口面積が減少するように徐々に縮径している、請求の範囲第1項に記載のガス発生器。 - 前記フィルタ(70)は、前記ハウジングの軸方向に沿って延びる中空連通部(71)を有し、
前記中空連通部(71)は、前記フィルタ(70)の前記作動ガス生成室側の端面に少なくとも達し、
前記仕切り部材(40)は、前記フィルタ(70)の前記端面を覆う環状板部(41)と、前記環状板部(41)の内周縁から前記フィルタ(70)の前記中空連通部(71)内に向けて連続して延びることで前記フィルタ(70)の前記端面寄りの内周面を覆う筒状突出部(42)とを含み、
前記第2連通孔(43)は、前記仕切り部材(40)の前記筒状突出部(42)の内周面によって規定され、
前記仕切り部材(40)の前記筒状突出部(42)は、前記仕切り部材(40)の前記環状板部(41)から遠ざかるにつれて前記第2連通孔(43)の開口面積が増加するように徐々に拡径している、請求の範囲第1項に記載のガス発生器。 - 前記第1ハウジング部材(10)の外径と前記第2ハウジング部材(20)の外径とが、同一である、請求の範囲第1項に記載のガス発生器。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10769755A EP2426016A4 (en) | 2009-04-30 | 2010-04-27 | GAS GENERATOR |
CN2010800189263A CN102414058A (zh) | 2009-04-30 | 2010-04-27 | 气体发生器 |
MX2011011270A MX2011011270A (es) | 2009-04-30 | 2010-04-27 | Generador de gas. |
US13/267,000 US20120048137A1 (en) | 2009-04-30 | 2010-04-27 | Gas generator |
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JP2009110733A JP2010260387A (ja) | 2009-04-30 | 2009-04-30 | ガス発生器 |
JP2009-110734 | 2009-04-30 | ||
JP2009110734A JP5545703B2 (ja) | 2009-04-30 | 2009-04-30 | ガス発生器 |
JP2009-110733 | 2009-04-30 | ||
JP2010-004783 | 2010-01-13 | ||
JP2010004783A JP2011143777A (ja) | 2010-01-13 | 2010-01-13 | ガス発生器 |
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WO2010126057A1 true WO2010126057A1 (ja) | 2010-11-04 |
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PCT/JP2010/057492 WO2010126057A1 (ja) | 2009-04-30 | 2010-04-27 | ガス発生器 |
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US (1) | US20120048137A1 (ja) |
EP (1) | EP2426016A4 (ja) |
KR (1) | KR20120033300A (ja) |
CN (1) | CN102414058A (ja) |
MX (1) | MX2011011270A (ja) |
WO (1) | WO2010126057A1 (ja) |
Families Citing this family (19)
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WO2010079710A1 (ja) * | 2009-01-06 | 2010-07-15 | 日本化薬株式会社 | ガス発生器 |
JP5551382B2 (ja) * | 2009-04-15 | 2014-07-16 | 日本化薬株式会社 | ガス発生器 |
JP5450306B2 (ja) * | 2010-07-29 | 2014-03-26 | 株式会社ダイセル | ガス発生器 |
EP3037163B1 (en) * | 2013-08-20 | 2018-11-21 | Daicel Corporation | Gas generator |
JP6483949B2 (ja) | 2014-01-09 | 2019-03-13 | 株式会社ダイセル | ガス発生器 |
FR3021105B1 (fr) * | 2014-05-19 | 2017-01-13 | Herakles | Generateur de gaz pyrotechnique |
JP6312545B2 (ja) | 2014-07-24 | 2018-04-18 | 日本化薬株式会社 | ガス発生器 |
GB2530295A (en) * | 2014-09-18 | 2016-03-23 | Ford Global Tech Llc | Inflator propellant |
JP6449664B2 (ja) * | 2015-02-05 | 2019-01-09 | Kyb株式会社 | シール装置 |
JP6521834B2 (ja) * | 2015-10-27 | 2019-05-29 | 日本化薬株式会社 | ガス発生器 |
JP6619293B2 (ja) * | 2016-05-23 | 2019-12-11 | 株式会社ダイセル | ガス発生器 |
DE102016213002B4 (de) * | 2016-07-15 | 2019-02-14 | Joyson Safety Systems Germany Gmbh | Gasgenerator für ein Gassackmodul eines Fahrzeuginsassen-Rückhaltesystems und Verfahren zum Herstellen eines Gasgenerators |
JP6633985B2 (ja) * | 2016-07-20 | 2020-01-22 | 株式会社ダイセル | ガス発生器 |
JP6851176B2 (ja) * | 2016-10-28 | 2021-03-31 | 日本化薬株式会社 | ガス発生器 |
DE102016123312A1 (de) * | 2016-12-02 | 2018-06-07 | Trw Airbag Systems Gmbh | Gasgenerator, gassackmodul und fahrzeugsicherheitssystem |
CN107813784B (zh) * | 2017-10-20 | 2020-03-27 | 重庆电子工程职业学院 | 一种汽车安全气帘的充气装置 |
JP7436297B2 (ja) * | 2020-06-15 | 2024-02-21 | 日本化薬株式会社 | ガス発生器 |
US11912231B2 (en) | 2020-10-27 | 2024-02-27 | Arc Technology Holding Limited | Inflator with open center generant holder |
CN118343330A (zh) * | 2024-06-18 | 2024-07-16 | 成都金支点科技有限公司 | 一种无人机发射用发射装置 |
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CN102414058A (zh) | 2012-04-11 |
EP2426016A4 (en) | 2012-08-01 |
US20120048137A1 (en) | 2012-03-01 |
KR20120033300A (ko) | 2012-04-06 |
MX2011011270A (es) | 2011-11-04 |
EP2426016A1 (en) | 2012-03-07 |
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