WO2004052694A1 - エアバッグ用ガス発生器 - Google Patents
エアバッグ用ガス発生器 Download PDFInfo
- Publication number
- WO2004052694A1 WO2004052694A1 PCT/JP2003/015726 JP0315726W WO2004052694A1 WO 2004052694 A1 WO2004052694 A1 WO 2004052694A1 JP 0315726 W JP0315726 W JP 0315726W WO 2004052694 A1 WO2004052694 A1 WO 2004052694A1
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- WO
- WIPO (PCT)
- Prior art keywords
- gas
- combustion chamber
- combustion
- generating agent
- gas generating
- Prior art date
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Classifications
-
- 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
-
- 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
- B60R21/263—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 variable source, e.g. plural stage or controlled output
- B60R2021/2633—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 variable source, e.g. plural stage or controlled output with a plurality of inflation levels
-
- 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
- B60R2021/2648—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 comprising a plurality of combustion chambers or sub-chambers
-
- 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
Definitions
- the present invention relates to a gas generator for an airbag that protects an occupant from an impact.
- a first combustion chamber 234 is disposed in a space formed by housings 214, 216, and a second combustion chamber 296 is disposed therein.
- the second combustion chamber 296 is partitioned by a partition wall 284, a lid 285 is fitted in the opening 302, and the lid 285 is detached by the combustion of the gas generating agent in the second combustion chamber.
- the opening adjusts the combustion performance of the gas generating agent in the second combustion chamber.
- JP-A-2001-97175 Japanese Patent Application Laid-Open No. H10-3242419 can be mentioned.
- the present invention is an airbag for an airbag, which can ensure the reliability of operation, reduce the generation of NOx and the like, clean the gas, and improve the combustibility of the gas generating agent during operation. It is an object to provide a gas generator.
- the invention according to claim 1 includes, as means for solving the problems, a housing having a gas discharge hole, first and second ignition means operated by an impact, and a gas generator containing a gas generating agent which generates combustion gas by igniting and burning.
- a gas generator for an airbag including the first and second combustion chambers,
- the first combustion chamber and the second combustion chamber are separated by a partition, and the partition adjusts the volume ratio of the first combustion chamber and the second combustion chamber to a range of 1/1 to 9/1.
- the volume ratio between the first combustion chamber and the second combustion chamber is preferably 3/2 to 8Z2.
- the first ignition means is activated first, and the 2 The ignition means may be activated.
- the internal pressure of the airbag during inflation may differ as described below.
- first combustion gas The heat from the high-temperature combustion gas generated by the combustion of the gas generating agent in the first combustion chamber (referred to as “first combustion gas” for convenience) is transferred to other members in the housing (particularly a coolant / filter for cooling the combustion gas). ) After the airbag is absorbed and cooled down Inflow into the fl Peng Zhang.
- the coolant / filter etc. already absorb heat and become high temperature. Therefore, the heat of the second combustion gas is not absorbed as much as the first combustion gas, and the second combustion gas flows into the air bag at a higher temperature than the first combustion gas and expands. For this reason, the internal pressure of the airbag increases.
- first combustion gas The heat generated by the high-temperature combustion gas generated by the combustion of the gas generating agent in the first combustion chamber (referred to as “first combustion gas” for convenience) is transferred to other members in the housing (particularly a coolant / filter for cooling the combustion gas). ), Flows into the airbag after the temperature has dropped, and inflates. At this time, the amount of heat absorbed by the coolant / filter is smaller than that of the above (1) due to the lower combustion temperature.
- the gas generating agent in the second combustion chamber burns to generate high-temperature combustion gas (referred to as “second combustion gas” for convenience)
- second combustion gas high-temperature combustion gas
- the heat absorption of the coolant, the filler, and the like is lower than in the case of (1).
- the remaining capacity (cooling capacity) is large, the heat of the second combustion gas is absorbed more than in the case of (1).
- the second combustion gas flows into the air bag at a relatively low temperature and expands. For this reason, the internal pressure of the airbag is lower than in the case of (1).
- the amount of generated combustion gas (generated gas Is increased.
- the volume ratio of the first combustion chamber and the second combustion chamber is adjusted and the amount of generated gas is adjusted by changing the gas generating agent filling amount for each combustion chamber, the air in the case of (2) can be obtained.
- the internal pressure of the bag can be prevented from dropping.
- the invention of claim 1 provides a means for easily adjusting the volume ratio between the first combustion chamber and the second combustion chamber from such a viewpoint, and further from the viewpoint of achieving the downsizing of the gas generator itself. To provide.
- the gas generator for an airbag according to claim 1, wherein the inner cylinder is disposed inside the housing, an annular first combustion chamber is provided outside the inner cylinder, and two ignition means are provided on a lower side inside the inner cylinder.
- a second combustion chamber is further provided on the upper side in the inner cylinder.
- the inner cylinder arranged in the housing has a different diameter depending on the height in the housing axial direction.
- the inner cylinder is used as a partition separating the first combustion chamber and the second combustion chamber, and its diameter is varied according to the height position, without changing the height of the gas generator itself. That is, it is possible to easily change the volume ratio between the first combustion chamber and the second combustion chamber after achieving the miniaturization of the gas generator.
- a housing having a gas discharge hole, first and second ignition means operated by impact, and a gas generator containing a gas generating agent which generates combustion gas by igniting and burning are contained.
- a gas generator for an airbag including the first and second combustion chambers,
- the first combustion chamber and the second combustion chamber are separated by separation means having a communication hole, and the second combustion chamber is disposed so as to be included in the first combustion chamber,
- An airbag gas generator in which the combustion performance of a second combustion chamber is adjusted by the communication hole.
- the second combustion chamber is included in the first combustion chamber means that a part or all of the side wall of the second combustion chamber is in the first combustion chamber, a part of a ceiling wall of the second combustion chamber or This includes a configuration in which the entirety is in the first combustion chamber, and a configuration in which a part or all of the second combustion chamber and a part or all of the ceiling wall are in the first combustion chamber.
- a gas generator that has a plurality of combustion chambers, one of which (for example, the second combustion chamber) is included in the other one (for example, the first combustion chamber), and which has a communication hole communicating between both chambers
- the gas generated from the second combustion chamber passes through the first combustion chamber and is discharged to the outside, so that the combustion performance of the gas generating agent is adjusted at the gas discharge port formed in the housing. Done.
- the unburned second gas cannot be removed due to the problem of later disposal of the airbag system (mainly the gas generator). It is necessary to burn out the gas generating agent (or the secondary charge and ignition powder used as the second ignition means).
- the second ignition means is activated with a delay of about 100 msec, and burns out the unburned second gas generating agent and the second ignition means (the transfer charge and the ignition charge).
- the gas from the first gas generating agent has already been exhausted from the housing, so that the internal pressure of the housing has dropped to near atmospheric pressure.
- a gas such as NOx may be generated due to insufficient pressure.
- adjusting the internal combustion pressure can be mentioned. Specifically, this can be achieved by correlating the surface area of the gas generating agent with the opening diameter of the gas discharge nozzle. However, in general, the amount of the gas generating agent (first gas generating agent) that burns first is reduced. When the opening area of the gas outlet is adjusted to the surface area of the first gas generating agent, when the second gas generating agent is burned after being sent, the opening area is the surface area of the second gas generating agent. Therefore, the internal combustion pressure does not increase.
- the combustion internal pressure can be increased even in the above case, Operation is assured, and gas cleaning can be achieved.
- the amount of the second gas generating agent is generally smaller than that of the first gas generating agent.
- the invention according to claim 6 is the invention according to claim 5, wherein a retainer is disposed in the second combustion chamber, and the communication hole and the gas generating agent are separated by the retainer so that the communication hole and the gas generating agent do not come into contact with each other.
- a generator is disposed in the second combustion chamber, and the communication hole and the gas generating agent are separated by the retainer so that the communication hole and the gas generating agent do not come into contact with each other.
- the retainer is preferably a wire mesh (the invention of claim 7).
- the size of the mesh of the wire mesh is such that the flow of the gas generated by the combustion of the gas generating agent can be maintained smoothly and the gas generating agent does not leak.
- the gas from the gas generating agent that has started burning near the ignition means will be in communication at the initial stage because the gas generating agent near the communication hole is not burning at the initial stage. It becomes difficult to pass through the hole. Therefore, by separating the communication hole from the gas generating agent, the flow of gas is performed smoothly.
- the invention according to claim 8 is the invention according to any one of claims 5 to 7, wherein the housing has a plurality of gas outlets, and the gas outlet is closed by a shielding member before operation.
- a gas generator for an airbag in which the shielding member bursts in multiple stages after actuation.
- rupture in multiple stages means that the gas outlets are opened with a time difference by the rupture of the shielding member closing the plurality of gas outlets with a time difference. It is preferable that the shielding member is covered with a metal tape such as an aluminum tape or a stainless steel tape with an adhesive so as to cover the gas outlet, and is fixed.
- the blocking member is ruptured in multiple stages by applying any of the methods (1) to (3), the difference in combustion internal pressure in the housing generated by the environmental temperature when the gas generating agent ignites and burns
- the operation output of the gas generator can be averaged.
- the output (or housing internal pressure) is lower in winter, but the shielding member breaks in multiple stages according to the internal combustion pressure.
- the difference in operating output (housing internal pressure) due to the difference in temperature can be reduced, and a gas generator with stable performance can be provided.
- shut-off member is ruptured in multiple stages by applying one or both of methods (1) and (2), the internal combustion pressure in the housing generated by the ambient temperature when the gas generating agent ignites and burns Therefore, the operating output of the gas generator due to the difference can be averaged.
- the shielding member When there are multiple (for example, two) combustion chambers, and each gas generating agent is ignited and burned by independent ignition means, the shielding member is broken by the combustion of the gas generating agent in one combustion chamber. If the shielding member is ruptured in multiple stages by the combustion of each gas generating agent, such as a shielding member that is broken by the combustion of another gas generating agent, the ignition mode (for example, two ignition means (Ignition, ignition of one delayed, etc.), the operating output can be adjusted by adjusting the combustion internal pressure without excess or deficiency, and a stable performance gas generator Can be provided.
- the ignition mode for example, two ignition means (Ignition, ignition of one delayed, etc.
- a gas opening with a larger or smaller opening area shall be provided, and these shall be opened in multiple stages.
- the output can be adjusted more finely, and the difference in output due to the operating temperature can be reduced.
- the invention according to claim 9 includes, as other means for solving the problems, a housing having a gas discharge hole, first and second ignition means operated by impact, and a gas generating agent which generates combustion gas by igniting and burning.
- a gas generator for an air bag including the first and second combustion chambers,
- the first combustion chamber and the second combustion chamber are separated by a partition, and the communication between the first combustion chamber and the second combustion chamber is made only by a communication hole provided in the partition.
- the generated combustion gas flows into the first combustion chamber from the communication hole, and is discharged from the gas discharge hole.
- the volume ratio of the first combustion chamber and the second combustion chamber is adjusted in the range of 1Z1 to 9/1, and the combustion state of the gas generating agent in the second combustion chamber is controlled by the communication hole.
- a gas generating agent having a low combustion temperature which is generally considered to have poor ignition performance, for example, a gas generating agent having a combustion temperature in the range of 1000 to 170 ° C. was used. This is suitable for (the invention of claim 10).
- the gas generator for an air bag according to the present invention has a low combustion temperature and poor ignitability for the purpose of reducing the amount of generated gas such as NOX during operation by improving the structure of the gas generator. Even when a gas generating agent is used, the same ignitability as when using a gas generating agent having a high combustion temperature and good ignitability can be secured. Therefore, it is possible to reduce the amount of NOx generated during operation, to ensure the operation reliability, and to further reduce the size of the gas generator.
- FIG. 1 is an axial cross-sectional view of a gas generator for an airbag suitable for the first embodiment.
- FIG. 2 is a schematic plan view for explaining an arrangement state of the second transfer charge in FIG.
- FIG. 3 is a schematic sectional view of another embodiment of FIG.
- FIG. 4 is an axial cross-sectional view of an airbag gas generator suitable for the second embodiment.
- FIG. 5 is an axial cross-sectional view of a gas generator for an airbag suitable for the third embodiment.
- FIG. 6 is a combustion internal pressure curve of a gas generator in a 60 L tank combustion test using the air bag gas generator of FIG.
- FIG. 1 is a cross-sectional view in the axial direction of the airbag gas generator of the present invention.
- axial direction means the direction of the housing ⁇ fi
- radial direction means the radial direction of the housing.
- an outer shell container is formed by a housing 11 formed by joining a diffuser shell 12 and a closure shell 13 forming an internal storage space together with the diffuser shell 12.
- the diffuser shell 12 and the closure shell 13 are welded at a weld 14.
- the other black portions also indicate welds.
- the diffuser shell 12 is provided with a required number of gas outlets 17 and 18.
- the gas outlets 17 and 18 may have the same diameter or different diameters.
- a substantially cylindrical inner cylinder 15 functioning as a partition separating the first combustion chamber 20 and the second combustion chamber 25 is disposed in the housing 11, and a peripheral edge of an upper end of the inner cylinder 15 is provided.
- the first combustion chamber 20 and the second combustion chamber 25 are joined to the ceiling surface 12 a of the diffuser 12 and the lower end periphery is joined to the bottom surface 13 a of the closure shell 13. Separated.
- the inner cylinder 15 is radially enlarged at the inclined wall portion 15a such that the inner diameter of the upper portion (the ceiling surface 12a side) is larger than the inner diameter of the lower portion (the bottom surface 13a side). .
- the inclined wall portion 15a may be reduced in the radial direction.
- the amounts, compositions, shapes, and the like of the first gas generating agent and the second gas generating agent can be appropriately adjusted.
- the volume ratio between the first combustion chamber 20 and the second combustion chamber 25 should be appropriately adjusted according to the amounts, compositions, shapes, etc. of the first and second gas generating agents. Can be.
- the gas generating agent having a particularly low combustion temperature can be obtained.
- the combustion temperature is 10000 to 1700
- the internal pressure when the airbag is inflated and the combustion temperature is high (1700 to 30000 :) Can be increased to the same extent as when
- An annular (or cylindrical) first combustion chamber 20 is provided in the outer space of the inner cylinder 15 and contains a first gas generating agent (not shown).
- a second combustion chamber 25 containing a second gas generating agent (not shown) is provided in an upper space inside the inner cylinder 15, and an ignition device containing two ignition means is provided in a lower space.
- a means room is provided.
- a first igniter 31 and a first transfer charge 35 are arranged in the first ignition means chamber, and a second igniter 32 and a second transfer charge 36 are arranged in the second ignition means chamber.
- the first igniter 31 and the second igniter 32 are fixed to one collar 33 and mounted in parallel in the radial direction.
- the first igniter 31 and the second igniter 32 are connected to a power source (battery) via a connector and a lead wire. .
- the upper and lower space in the inner cylinder 15, that is, the second combustion chamber 25, the first igniter 31, and the second igniter 3 2 is separated by a flat partition wall 40 having a skirt portion 41 and a second through hole 52. Since the flat partition wall 40 is fitted into the stepped portion 16 of the inner cylinder 15 from below, even when the first igniter 31 is activated, it moves upward due to the pressure at the time of activation. Is prevented.
- the inner diameter of the skirt portion 41 is set to be substantially the same as the diameter of the ignition portion of the igniter 32, and the skirt portion 41 is in close contact with and surrounds the ignition portion. The flame generated by the operation goes straight only in the second through-hole 52 direction.
- the second combustion chamber 25 is separated from the two igniters, and the space between the first igniter 31 and the second igniter 32 is formed. Because of the separation, the ignition energy (flame, combustion gas, etc.) generated by the operation of the first igniter 31 enters the second ignition means chamber and further passes through the second through hole 52 to the second combustion chamber. It is prevented from entering into 25.
- a first transfer charge 35 filled in an aluminum cup is arranged.
- a first through hole 51 provided at a lower portion of the side wall of the inner cylinder 15 communicates the first combustion chamber 20 with the first ignition means chamber, and is substantially in communication with the center of the first transfer agent 35. The direction of the flame generated by the operation of the first igniter 31 is not directly opposed to the first through hole 51.
- a seal tape 60 made of aluminum or stainless steel is attached to the first through hole 51 from inside.
- the operation of the first igniter 31 makes the entire first charge 35 substantially uniform. Burned.
- the ignition energy generated by the combustion of the first transfer agent 35 is turned upward after being discharged in the radial direction. As a result, the ignitability of the entire first gas generating agent contained in the first combustion chamber 20 is improved.
- FIG. Figure 2 shows the second charge 3 6 It is a top view which shows the arrangement state of.
- a second transfer charge 36 is arranged above the second igniter 32 and on the flat partition wall 40.
- the second transfer charge 36 is filled in an aluminum cup 45 having a plurality of transfer holes 46.
- the aluminum cup 45 holds the second transfer charge 36 housed therein, and a flange 45 a extending in the radial direction is formed on the periphery of the opening of the cup 45.
- the flange 45 a is fixed by being sandwiched between the stepped portion 16 and the flat partition wall 40 from above and below. With such a fixed structure, the cup 45 is prevented from moving or coming off when the first and second transfer charges burn, and as a result, the flame from the igniter 32 is prevented from flowing. (2) Since it is possible to reliably lead the entirety of the second charge 36, the ignitability of the second charge 36 is improved.
- the plurality of heat transfer holes 46 provided in the aluminum cup 45 are not directly opposed to the traveling direction of the flame generated by the operation of the second igniter 32 (directly above the second igniter 32). .
- the aluminum power pack 46 filled with the second transfer charge 36 has a shape having a convex portion 47 directly above the second igniter 32. be able to.
- the filling amount of the second transfer agent 36 can be increased, so that the ignitability of the second gas generating agent is further improved.
- a heat transfer hole 46 is provided on a plane excluding the convex portion 47 as shown in FIG.
- a cylindrical bottomed retainer 55 is fitted into the second combustion chamber 25 with the opening side down, and the inner wall 25 of the second combustion chamber 25 is formed at the side wall tip 55a. It is fixed by pressing a.
- a gap 57 is provided between the side wall of the retainer 55 and the inner wall 25a of the second combustion chamber 25 to such an extent that a gas flow path can be secured.
- the retainer 55 has a plurality of openings (nozzles) 56 on the side wall.
- the height of these openings 56 in the axial direction is determined by the third through-hole provided in the inner cylinder 15. It is set to be higher than the height position of 53.
- the third through-hole 53 is closed from the outside by a seal tape 58 made of stainless steel, and the opening 56 may be closed from the inside by a seal tape 80 made of aluminum or stainless steel.
- a seal tape 80 made of aluminum or stainless steel.
- the third through hole 53 is closed by the second gas generating agent. Is prevented. If the third through-hole 53 is closed by the second gas generating agent, the internal pressure in the second combustion chamber 25 excessively increases in the early stage of combustion, and the second gas that blocks the third through-hole 53 When the generator burns, opening the third through-hole 53 sharply lowers the internal pressure, which may impair stable combustibility.
- the third through hole 53 is provided below the second combustion chamber 25.
- the gas generated by the combustion of the second gas generating agent passes through the opening 56 on the upper side of the second combustion chamber 25, and is discharged from the third through hole 53, (2) The fire around the entire inside of the combustion chamber 25 is improved, and the combustibility of the second gas generating agent is improved.
- the total opening area of the third through-holes 53 is set to be smaller than the total opening area of the openings 56 and smaller than the total opening area of the gas discharge holes 17 and 18.
- the combustion state in the second combustion chamber 25 is controlled by the third through hole 53.
- the pressure difference between the first combustion chamber 20 and the second combustion chamber 25 becomes small, so that the second combustion chamber 25 Although the internal pressure becomes higher, the influence of the pressure control by the third through hole 53 becomes smaller.
- the second igniter 32 may be operated to ignite and burn the second gas generating agent about 100 ms after the operation of the first igniter 31.
- the combustion state of the second combustion chamber 25 can be controlled by the third through-hole 53, the ignition and combustibility of the second gas generating agent is improved, and the generation of gases such as NOX is suppressed. This is preferred.
- a cylindrical filter 65 is provided for the filter.
- an inner cylindrical shielding plate 66 is disposed inside the cylindrical filter 65, and the cylindrical filter 66 is disposed.
- a gap (first gap 71) is provided between 5 and the inner cylindrical shielding plate 66.
- the inner cylindrical shielding plate 66 at the portion in contact with the cylindrical filter 65 (the portion having the same width as the gap) is made to have a sparse structure. The state may be the same as described above.
- an outer cylindrical shielding plate 67 is arranged in contact with the outer peripheral surface of the cylindrical filter 65.
- a gap (second gap 72) is provided between the outer cylindrical shielding plate 67 and the peripheral wall of the housing 11. It is preferable that the second gap 72 be set wider than the width of the first gap 71.
- the inner cylindrical shielding plate 66 and the outer cylindrical shielding plate 67 do not cover the entire surface of the cylindrical filter 65.
- the inner cylindrical shielding plate 66 has a lower end of the cylindrical filter 65 (1Z2 to the entire height of the cylindrical filter 65) with one peripheral edge abutting against the bottom surface 13a. 2 Z 3 height range). However, a state similar to that shown in FIG. 1 may be provided by covering the entire surface of the filter 65 with the inner cylindrical shielding plate 66 and providing a plurality of ventilation holes in a part thereof.
- the outer cylindrical shielding plate 67 is positioned above the cylindrical filter 65 with one end abutting against the ceiling surface 12a. (Height range of about 3). However, a state similar to that shown in FIG. 1 may be provided by covering the entire surface of the filter 65 with the outer cylindrical shielding plate 67 and providing a plurality of ventilation holes in a part thereof.
- the filter 65, the inner cylindrical shielding plate 66, and the outer cylindrical shielding plate 67 are further improved.
- the combustion gas generated in the first combustion chamber 20 and the second combustion chamber 25 enters the cylindrical filter 65 from a part not covered by the inner cylindrical shielding plate 66, and a part of the gas remains as it is.
- the remaining portion of the combustion gas moves through the first gap 72, it passes through the cylindrical filter 65 in the radial direction to reach the second gap 72, and from the gas discharge ports 17 and 18 Is discharged.
- seal tape 75 blocking the gas outlets 17 and 18 may burst at the same time depending on the operating conditions of the igniter (one-sided operation, two-sided operation, and operation with a time difference). It can be set to burst only partially.
- the explosive charge 35 is ignited and burned, and the ignition energy breaks the seal tape 60 and is discharged into the first combustion chamber 20 through the first through hole 51. .
- the ignition energy is emitted in the axial direction and then moves upward in the first combustion chamber 20, so that the ignition efficiency of the first gas generating agent is good. Since the third through-hole 53 is closed by the stainless steel sealing tape 58, the combustion gas in the first combustion chamber 20 does not flow into the second combustion chamber 25.
- the combustion gas generated in the first combustion chamber 20 is, as described above, a combination of the inner cylindrical shielding plate 66, the cylindrical filter 65, and the outer cylindrical shielding plate 67, as well as the first gap 71, the second Due to the action of the gap 72, part or all of the seal tape 75 is ruptured, and the seal tape 75 is discharged from part or all of the gas discharge holes 17, 18 to inflate the airbag.
- the second igniter 32 is activated. At this time, since the flame travels straight through the second through hole 52, the traveling direction of the flame is not directly opposed to the transfer hole 46, so the second transfer charge filled in the aluminum cup 45 After all of 36 are ignited and burned, the ignition energy is released from the flares 46 into the second combustion chamber 25.
- the second gas generating agent in the second combustion chamber 25 is ignited and burned by the intrusion of ignition energy, but as described above, the height of the opening 56 of the retainer 55 and the height of the third through hole 53 are as described above. Since the pressure is adjusted, the fire around the entire second combustion chamber 25 is good, and the ignition and combustibility of the second gas generating agent is good. When the opening 56 is closed with the sealing tape 80, The operation as described above is performed.
- the gas generated in the second combustion chamber 25 is radially released from the third through hole 53, flows into the first combustion chamber 20, passes through the cylindrical filter 65, and passes through the gas discharge hole 17 Discharged from 18 to further inflate the airbag.
- the output by the first gas generating agent or the second gas generating agent contained in the first combustion chamber 20 or the second combustion chamber 25 is small (for example, the gas generating agent having a low combustion temperature).
- the internal pressure during combustion can be adjusted by adjusting the volume ratio of the first combustion chamber 20 or the second combustion chamber 25, and increasing or decreasing the amount of gas generating agent charged.
- the flammability of the first gas generating agent or the second gas generating agent is not impaired, and a sufficient internal pressure during inflation of the airbag can be secured.
- FIG. 4 is a cross-sectional view in the axial direction of the gas generator for an airbag.
- the gas generators for airbags shown in Fig. 4 and Fig. 1 differ in some components (gas outlets 17, 18 and retainer 55) on the drawing (that is, on the appearance), but have different configurations on the drawing. Since the elements have the same function, they are all assigned the same number.
- different components will be mainly described in the drawings, and description of the same components in the drawings will be omitted in principle.
- the first combustion chamber 20 and the second combustion chamber 25 are separated by an inner cylinder (separating means) 15, and the entire side wall of the second combustion chamber 25 is in the first combustion chamber 20.
- the first combustion chamber 20 and the second combustion chamber 25 are communicated by a plurality of third through holes (communication holes) 53 provided in the inner cylinder (separation means) 15.
- the plurality of third through holes (communication holes) 53 are closed by stainless steel sealing tape 58 from the outside.
- the total opening area of the communication holes 53 (opening area per unit X number) is set so as to correlate with the total surface area of the second gas generating agent. By doing so, for example, when the impact of the collision is small, the airbag is deployed by burning only the first gas generating agent, and the unburned second gas generating agent is burned out. About 100 msec from the operation of 1 When the second igniter 32 is operated with a delay of a degree, the combustion of the second gas generating agent can be adjusted by the communication hole 53, so that generation of gas components such as NOX due to insufficient pressure or the like can be suppressed. it can.
- first gas generating agent and the second gas generating agent may have the same or different filling amount, composition, composition ratio, combustion temperature, gas generation amount per unit weight, shape, and dimensions.
- a retainer 55 made of a wire mesh for example, a stainless steel wire mesh
- the retainer 55 causes the third through hole (communication hole) 53 and the second gas to pass through. It is separated so that the generator does not come into contact.
- the retainer (wire mesh) 55 has the same shape as the retainer in FIG. 1 and is arranged in the same manner. When a wire mesh is used as the retainer 55, a gap may be formed between the bottom of the retainer 55 and the ceiling surface 12a in order to improve the flow of gas to the communication hole 53.
- the wire mesh is formed from a plain-woven wire mesh, a tatami-woven wire mesh, or the like.
- the size of the mesh is such that the flow of gas generated by the combustion of the second gas generating agent can be held smoothly and the second gas generating agent leaks. It is a size that does not come out.
- the total opening area of the mesh is set to be larger than the total opening area of the communication holes 53.
- the wire mesh is not limited to the shape shown in FIG. 4, but may be one having both ends open and having an extended portion 55a at both ends.In place of the wire mesh, a porous punched metal, an expanded metal, or the like may be used. Can also be used.
- the second gas generating agent comes into contact with the communication hole 53, and the ignition energy is released from the communication hole 46.
- the gas generated from the second gas generating agent that has started burning, the unburned second gas generating agent that blocks the communication hole 53 prevents smooth flow to the first combustion chamber 20.
- Gas outlets 17 and 18 having different diameters are formed in the diffuser shell 12 forming the housing 11. The opening diameter of the gas outlet 18 is larger.
- the gas outlets 17 and 18 are closed with a seal tape (shielding member) 75.
- the seal tape 75 is applied in a multi-step manner after the operation of the gas generator for an air bag by applying the method (1) described above. It is set to burst.
- a setting may be made such that the gas generator for the airbag explodes in multiple stages after operation.
- the total surface area of the first gas generating agent (the gas generating agent that burns first) (A
- the range of AlZAtSO is preferably from 0 to 1300, and more preferably from 450 to 1000.
- A2ZAt 2 700 to 1300 is preferable, and 800 to 1000 is more preferable.
- the shape of the housing 11 when the shape of the housing 11 is compared with the axial length (height) and the radial length (diameter), they are almost the same or the length is larger.
- it is suitable as a gas generator for airbags mounted on the passenger side.
- the gas generator for the airbag used on the driver's seat side of the vehicle can be made longer in the radial direction.
- the inner cylindrical shielding plate 66 and the outer cylindrical shielding plate 67 can be omitted.
- the transfer charge 35 is ignited and burned, and the ignition energy breaks the seal tape 60, is discharged into the first combustion chamber 20 through the first through hole 51, and generates the first gas. Burn the agent.
- the combustion gas generated in the first combustion chamber 20 is, as described above, a combination of the inner cylindrical shielding plate 66, the cylindrical filter 65, the outer cylindrical shielding plate 67, the first gap 71, and the second cylindrical shielding plate 67.
- the gap 72 By the action of the gap 72, only a part of the seal tape 75 is ruptured, and the seal tape 75 is discharged from a part or all of the gas discharge hole 18 having a large opening diameter to inflate the airbag. At this time, the gas outlet 17 having a small opening diameter is not opened.
- the second igniter 32 is activated, and the second charge 36 is ignited and burned, and then the ignition energy is released from the mist hole 46 into the second combustion chamber 25 .
- the second gas generating agent in the second combustion chamber 25 is ignited and burned by the intrusion of the ignition energy.
- the combustion performance of the second combustion chamber 25 is adjusted by the communication hole 53. Further, since the retainer (wire mesh) 55 and the communication hole 53 are not in contact with each other, the outflow of the combustion gas is not hindered.
- the gas generated in the second combustion chamber 25 is radially released from the third through hole 53, flows into the first combustion chamber 20, passes through the cylindrical filter 65, and passes through the remaining sealing tape 7
- the airbag is inflated further by breaking 5 and being discharged from the gas discharge holes 17 and 18.
- FIG. 5 is a cross-sectional view of the gas generator for an airbag in the axial direction.
- FIG. 5 has the same basic structure as that of FIG. 7 of Japanese Patent Application Laid-Open No. 2001-130368, and is different in that the solution of the present invention is added.
- an outer shell container is formed by a housing 103 including a diffuser shell 101 and a closure shell 102.
- gas exhaust ports 110a, 110b (110b side) for introducing combustion gas generated from the first gas generating agent 152 and the second gas generating agent 162 into the airbag.
- the opening diameter is large) and is closed by a seal tape (for example, aluminum tape) 129. 125 is Phil Evening.
- the seal tape (shielding member) 129 that closes the gas outlets 110a and 110b can be formed by applying any of the above methods (1) to (3), and the method (1) or (2) and (3). It is set to burst in multiple stages after the generator is activated.
- a first inner cylinder (separating means) 136 is disposed, and inside the housing 103, there is provided a charge 153 for igniting the first gas generating agent 152 and a first igniter 151 for igniting the charge 153.
- the first inner cylinder 136 has a plurality of nozzles 137 on the side wall, and the inside of the first inner cylinder 136 and the first combustion chamber 150 are communicated by the nozzles 137.
- the upper opening of the first inner cylinder 136 is closed by the holding member 111.
- a second inner cylinder (separating means) 104 is further disposed, inside which is a second combustion chamber 160, and outside is a first combustion chamber filled with a first gas generating agent 152. Room 150. Therefore, the second combustion chamber 160 formed in the second inner cylinder 104 is in a state where the entire peripheral wall and the ceiling wall of the second combustion chamber 160 (the inner cylinder 104) exist in the first combustion chamber 150. It is included.
- a second igniter 161 and a second gas generating agent 162 are arranged in the second inner cylinder 104, and have the same structure, shape, mounting state, and function as the retainer (wire mesh) 55 of FIG. There are 190 retainers (wire mesh). Note that, in order to ignite the second gas generating agent 162, a transfer agent having the same function as the transfer agent 137 may be disposed in the second combustion chamber 160.
- a communication hole 106 which has the same function as the communication hole 53 of FIG. 4 and communicates the second combustion chamber 160 and the first combustion chamber 150, is provided on the peripheral wall of the second inner cylinder 104. (For example, aluminum or stainless steel tape).
- the seal member 107 ruptures only when the second gas generating agent 162 burns, and does not rupture when the first gas generating agent 152 burns.
- the gas generator for an air bag shown in FIG. 5 operates in the same manner as the gas generator for an air bag shown in FIG. 4, and there is no large difference in the internal pressure of the housing 103 during combustion. A stable output can be always expressed.
- the following three types of communication holes 53 were used, and changes in the internal combustion pressure of the second combustion chamber in each case were measured.
- a stainless steel tape having a thickness of 50 zzm was attached to the communication hole 53.
- FIG. 6 shows a change in the combustion pressure in the second combustion chamber 25 in the first to third embodiments. From FIG. 6, it can be confirmed that the smaller the total opening area of the communication holes 53 of the gas generator is, the higher the maximum internal combustion pressure is, and that the combustion is completed in a short time.
- the gas generating agents used in Examples 1 to 3 contain nitrogen element, and when burned at a low pressure, nitrogen oxides are likely to be generated.However, it is necessary to adjust the internal combustion pressure in the second combustion chamber. Thus, the amount of generated nitrogen oxides can be suppressed. Therefore, as shown in the results of FIG. 6, by adjusting the flow of gas generated from the second combustion chamber 25 through the communication hole 53, that is, by reducing the opening area and increasing the maximum combustion internal pressure, the nitrogen oxidation It is easily presumed that the generation of objects is also suppressed.
- Examples 1 to 3 show that, for example, when only the first gas generating agent having a small impact impact is burned, and the second gas generating agent is burned with a delay of about 100 msec for the subsequent gas generating agent treatment,
- the combustion of the second gas generating agent in the communication hole 53 of the inner cylinder 15 forming the second combustion chamber it also means that generation of gas components such as nitrogen oxides is suppressed.
- the pressure due to the combustion of the second gas generating agent exists because the space of the first combustion chamber 20 exists. Does not function as a combustion pressure adjustment for the second gas generating agent since the pressure spreads throughout the inside of the housing 11 and causes a pressure drop.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Bags (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03777396A EP1571050A4 (en) | 2002-12-09 | 2003-12-09 | GAS GENERATOR FOR AIRBAG |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-356703 | 2002-12-09 | ||
JP2002356703 | 2002-12-09 | ||
JP2003176323A JP2004237971A (ja) | 2002-12-09 | 2003-06-20 | エアバッグ用ガス発生器 |
JP2003-176323 | 2003-06-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004052694A1 true WO2004052694A1 (ja) | 2004-06-24 |
Family
ID=32510617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/015726 WO2004052694A1 (ja) | 2002-12-09 | 2003-12-09 | エアバッグ用ガス発生器 |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1571050A4 (ja) |
JP (1) | JP2004237971A (ja) |
WO (1) | WO2004052694A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5021447B2 (ja) * | 2007-12-21 | 2012-09-05 | 株式会社ダイセル | ガス発生器 |
US9016207B2 (en) | 2009-01-22 | 2015-04-28 | Autoliv Asp, Inc. | Gas generator for airbag device |
DE202010014286U1 (de) | 2010-10-15 | 2012-01-30 | Trw Airbag Systems Gmbh | Gasgenerator und Gassackmodul |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0773145A2 (de) * | 1995-11-08 | 1997-05-14 | TEMIC Bayern-Chemie Airbag GmbH | Anordnung zum mehrstufigen Zünden von Gasgeneratoren |
JPH10181516A (ja) * | 1996-10-31 | 1998-07-07 | Daicel Chem Ind Ltd | エアバッグ用ガス発生器及びエアバッグ装置 |
WO1999042339A1 (en) * | 1998-02-18 | 1999-08-26 | Autoliv Asp, Inc. | Adaptive output inflator |
WO2000048868A1 (fr) * | 1999-02-16 | 2000-08-24 | Daicel Chemical Industries, Ltd. | Generateur de gaz pour coussin gonflable de securite a etages multiples et dispositif de coussin gonflable de securite |
WO2001012476A1 (en) * | 1999-08-12 | 2001-02-22 | Breed Automotive Technology, Inc. | Dual stage airbag inflator |
WO2001042061A1 (fr) * | 1999-12-10 | 2001-06-14 | Nippon Kayaku Kabushiki-Kaisha | Generateur de gaz |
WO2001072561A1 (en) * | 2000-03-28 | 2001-10-04 | Atlantic Research Corporation | Compact dual nozzle air bag inflator |
JP2002120688A (ja) * | 2000-07-18 | 2002-04-23 | Automotive Systems Lab Inc | 二重チャンバー式インフレータ |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996026912A1 (fr) * | 1995-02-27 | 1996-09-06 | Nippon Koki Co., Ltd. | Agent generateur de gaz pour coussin gonflable de securite et generateur de gaz pour coussin gonflable de securite l'utilisant |
DE19725418A1 (de) * | 1997-06-16 | 1998-12-17 | Trw Airbag Sys Gmbh & Co Kg | Gasgenerator für eine Sicherheitseinrichtung |
DE19725452A1 (de) * | 1997-06-16 | 1998-12-17 | Temic Bayern Chem Airbag Gmbh | Gasgenerator für eine Sicherheitseinrichtung |
DE10006522B4 (de) * | 1999-03-05 | 2018-02-01 | Trw Vehicle Safety Systems Inc. | Aufblasvorrichtung für einen zweistufigen Airbag |
US6364353B2 (en) * | 1999-06-07 | 2002-04-02 | Trw Inc. | Dual stage air bag inflator |
-
2003
- 2003-06-20 JP JP2003176323A patent/JP2004237971A/ja active Pending
- 2003-12-09 EP EP03777396A patent/EP1571050A4/en not_active Withdrawn
- 2003-12-09 WO PCT/JP2003/015726 patent/WO2004052694A1/ja not_active Application Discontinuation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0773145A2 (de) * | 1995-11-08 | 1997-05-14 | TEMIC Bayern-Chemie Airbag GmbH | Anordnung zum mehrstufigen Zünden von Gasgeneratoren |
JPH10181516A (ja) * | 1996-10-31 | 1998-07-07 | Daicel Chem Ind Ltd | エアバッグ用ガス発生器及びエアバッグ装置 |
WO1999042339A1 (en) * | 1998-02-18 | 1999-08-26 | Autoliv Asp, Inc. | Adaptive output inflator |
WO2000048868A1 (fr) * | 1999-02-16 | 2000-08-24 | Daicel Chemical Industries, Ltd. | Generateur de gaz pour coussin gonflable de securite a etages multiples et dispositif de coussin gonflable de securite |
WO2001012476A1 (en) * | 1999-08-12 | 2001-02-22 | Breed Automotive Technology, Inc. | Dual stage airbag inflator |
WO2001042061A1 (fr) * | 1999-12-10 | 2001-06-14 | Nippon Kayaku Kabushiki-Kaisha | Generateur de gaz |
WO2001072561A1 (en) * | 2000-03-28 | 2001-10-04 | Atlantic Research Corporation | Compact dual nozzle air bag inflator |
JP2002120688A (ja) * | 2000-07-18 | 2002-04-23 | Automotive Systems Lab Inc | 二重チャンバー式インフレータ |
Non-Patent Citations (1)
Title |
---|
See also references of EP1571050A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1571050A4 (en) | 2006-03-08 |
JP2004237971A (ja) | 2004-08-26 |
EP1571050A1 (en) | 2005-09-07 |
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