WO2002051675A1 - Airbag et generateur de gaz pour air bag - Google Patents
Airbag et generateur de gaz pour air bag Download PDFInfo
- Publication number
- WO2002051675A1 WO2002051675A1 PCT/JP2001/011575 JP0111575W WO02051675A1 WO 2002051675 A1 WO2002051675 A1 WO 2002051675A1 JP 0111575 W JP0111575 W JP 0111575W WO 02051675 A1 WO02051675 A1 WO 02051675A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas generator
- inner cylinder
- cylinder member
- ignition means
- airbag
- 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
- 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
Definitions
- the present invention relates to a gas generator for an airbag and an airbag device.
- the present invention relates to a gas generator for an airbag which protects an occupant from an impact, and more particularly to an airbag gas generator and an airbag device which are characterized by its operation performance.
- a gas bag In vehicles such as automobiles, when the vehicle collides at a high speed, a gas bag is used to prevent the occupant from hitting a hard part inside the vehicle, such as the handle or the windshield, due to inertia and causing injury or death.
- the airbag system is equipped to quickly inflate the vehicle and prevent passengers from hitting dangerous places.
- Such an airbag system allows an occupant to have a different occupant's physique (for example, a person with a high or low sitting height, or an adult or a child), or a different riding position (for example, a posture that clings to eight dollars). It is desirable that the airbag system can be restrained safely. Therefore, in the early stage of operation, an airbag system has been proposed that operates with as little impact as possible to the occupant.
- capsules of two types of gas generating agents are used in order to generate gas in two stages, relatively slowly inflate the bag in the first stage, and perform quick gas generation in the second stage.
- the use of a gas generator has been proposed, but has the drawback that the structure inside the gas generator is complicated, the size of the container becomes large, and this increases the cost.
- a gas generator is required that is activated immediately by an activation signal received from a sensor that senses an impact and that quickly generates a sufficient amount of operating gas to inflate an airbag.
- the present invention has an air-conditioning system that has a simple structure, operates in the initial stage of operation with as little impact as possible on the occupant, and can reliably protect the occupant in the subsequent operation stage. It provides a gas generator for a bag.For example, in a gas generator for a driver's seat, the airbag inflation rate during the 10 ms after the gas generator is activated becomes slower than before, and After 50 to 50 milliseconds, a gas generator for an air bag is provided which has sufficient performance to restrain the occupant. Further, an airbag device using the gas generator is provided.
- An object of the present invention is to provide an airbag in which a substantially cylindrical inner cylindrical member is disposed in a housing having a gas discharge port, and an ignition means housing chamber is formed inside the inner cylindrical member and a combustion chamber is formed outside the inner cylindrical member.
- a gas generator wherein a plurality of heat transfer holes are formed on a peripheral surface of the inner cylinder member so that the ignition means housing chamber and the combustion chamber can communicate with each other.
- Inner cylinder The distance from the end of the member is formed to be less than 30% of the axial length of the inner cylinder member, which is achieved by the gas generator for an airbag. It is desirable that the plurality of heat transfer holes be formed such that the distance from the end of the inner cylinder member is within 25% of the axial length of the inner cylinder member.
- the inner cylinder member is arranged inside the housing, and defines an ignition means housing chamber inside and a combustion chamber outside. Therefore, it is necessary to provide at least an ignition means accommodating chamber on the inner side of the inner cylinder member.
- another chamber for example, a combustion chamber existing separately from the outer side of the inner cylinder member (ie, the second combustion chamber) Room) may be provided.
- the ignition means accommodating chamber is a chamber accommodating the ignition means for starting the operation of the gas generator
- the combustion chamber is a chamber accommodating the gas generating means ignited and burned by the activated ignition means.
- the transmission hole is a through hole for discharging the flame of the ignition means for igniting the gas generating means to the combustion chamber.
- the inner cylindrical member includes a member provided with a flange at an end opening.
- an igniter to which an ignition current for activation is applied is housed at one end side of the inner cylinder member arranged in the housing, and the plurality of fire holes are formed in the inner cylinder portion. It can be formed closer to the other end on the side where the igniter is arranged than the center in the axial direction of the material.
- a substantially cylindrical inner cylinder member is disposed in a housing having a gas discharge port, and an ignition means accommodation chamber for accommodating an ignition means inside the inner cylinder member;
- a combustion chamber for containing the gas generating agent is formed, and a plurality of communicating portions that allow communication between the ignition means housing chamber and the combustion chamber are formed in a circumferential direction on a peripheral surface of the inner cylinder member.
- the communicating portion may have a central angle between adjacent communicating portions greater than 60 °.
- the gas generator usually generates a flame when the ignition means arranged in the ignition means accommodating chamber is activated, and the flame enters the combustion chamber through a plurality of heat transfer holes formed on the peripheral surface of the inner cylinder member. It is formed as a spout. Therefore, in the present invention, in order to solve the above-mentioned problem, there is provided a gas generator for an airbag in which the ejection angle of the flame ejected from the blast hole is adjusted.
- a substantially cylindrical inner cylinder member is arranged in a housing having a gas discharge port, and an ignition means accommodation chamber for accommodating ignition means inside the inner cylinder member, and a combustion chamber for accommodating a gas generating agent outside.
- a plurality of heat transfer holes for ejecting a flame generated by the operation of the ignition means into the combustion chamber, and forming a plurality of heat transfer holes on a peripheral surface of the inner cylinder member.
- the vent is a gas generator for airbags, characterized in that the flame is blown into the combustion chamber at an elevation and depression angle of 45 °.
- an airbag that operates in the early stage of operation with as little impact on the occupant as possible and that can reliably protect the occupant in a subsequent operation stage Gas generator.
- the operating performance of the gas generator is defined as P (kPa), the desired tank maximum pressure in the tank combustion test, and T millimeters from the start of tank pressure rise to the tank maximum pressure P (kPa).
- P (kPa) the desired tank maximum pressure in the tank combustion test
- T millimeters from the start of tank pressure rise to the tank maximum pressure P (kPa).
- the tank pressure after 0.25XT millisecond can be 0.25xP (kPa) or less. It is desirable that this operation performance is further adjusted so that the tank pressure after 0.80XT milliseconds becomes 0.70xP (kPa) or more.
- the peak of the internal pressure of the housing during the operation of the gas generator appears 10 to 20 milliseconds after the application of the ignition current. It is desirable to reach the maximum housing internal pressure within 10 to 20 milliseconds after the application.
- gas is generated by gradually discharging the combustion gas of the gas generating agent from the gas discharge port until 10 to 20 milliseconds after the application of the ignition current at which the maximum internal pressure in the housing reaches its peak.
- the pressure in the tank is gradually increased while increasing the pressure of the vessel. Then, after the pressure in the housing of the gas generator reaches a peak, a sufficient amount of gas for restraining an occupant is rapidly discharged from the gas discharge port, and the pressure in the gas generator is reduced. Increase the pressure in the tank at once. This Such a gas generator can provide the desired tank maximum pressure in the sunset combustion test as described above.
- the tank pressure after 0.25XT milliseconds is 0.25xP (kPa) or more, depending on the operating conditions (for example, the outside air temperature, etc.), the moment when the bag breaks out of the module and comes out.
- the operating conditions for example, the outside air temperature, etc.
- At least one of the heat transfer holes formed in the inner cylinder member that partitions the inside of the housing into the combustion chamber and the ignition means housing chamber is located closer to the center than the center of the inner cylinder member. It must be formed near one end, but other components such as the composition and shape of the gas generating means, the cooling and / or purifying working gas generated by the combustion of the gas generating means. The presence or absence of coolant or filter, or the overall shape of the housing, can be adjusted as appropriate to the operating performance.
- the size and number of gas outlets formed in the housing, the housing size, the overall shape, and the like can be appropriately adjusted according to the operability, the accommodation space, and the like.
- the gas generator for an airbag described above is housed in a module case together with an airbag (bag) that introduces and inflates the gas generated by the gas generator, and serves as an airbag device.
- This airbag device works in conjunction with the impact sensor sensing the impact.
- the gas generator operates and discharges the working gas from the gas outlet of the housing. This working gas flows into the airbag, which breaks the module cover and bulges out, creating a cushion between the rigid structure in the vehicle and the occupant that absorbs shock.
- the gas generator for an airbag according to the present invention operates with as little impact on the occupant as possible in the early stage of operation, but then inflates the airbag rapidly to ensure the occupant.
- a gas generator for an airbag having a simple structure that can be protected.
- the present invention provides a gas generator for an airbag having a structure in which even a gas generating agent having a lower ignitability than a gas generating agent used in a conventional gas generator can be used. It is an object of the present invention to provide a gas generator capable of exhibiting sufficient operation performance in an early stage of operation even with such a gas generating agent. In addition, an airbag device using the gas generator is provided.
- An object of the present invention is to provide a housing having a gas discharge port, a substantially cylindrical inner cylinder member disposed therein, an ignition means accommodating chamber for accommodating an ignition means inside the inner cylinder member, and a gas generation chamber outside.
- a gas generator for an airbag having a combustion chamber for accommodating an agent, wherein a plurality of flames generated by operation of an ignition means are ejected into a first combustion chamber on a peripheral surface of the inner cylinder member.
- a hole is formed, and the fire hole is formed in a range where the distance from the end of the inner cylinder member is 30 to 70% of the axial length of the inner cylinder member. This is achieved by a gas generator for an air bag.
- a plurality of communication portions that allow communication between the ignition means housing chamber and the combustion chamber are formed in the circumferential direction on the peripheral surface of the inner cylinder member, and the plurality of communication portions are formed between adjacent communication portions.
- the present invention is also achieved by a gas generator for an air bag, wherein the central angle is adjusted to be 60 ° or less, preferably 45 ° or less.
- the inner cylinder member is disposed inside the housing, and defines an ignition means housing chamber on the inside and a combustion chamber on the outside. Therefore, of this inner cylinder member It is necessary to provide at least an ignition means accommodating chamber on the side, but another chamber, for example, a combustion chamber (that is, a second combustion chamber) that exists separately from the outside of the inner cylinder member may be provided.
- the ignition means accommodating chamber is a chamber accommodating the ignition means for starting the operation of the gas generator
- the combustion chamber is a chamber accommodating the gas generating means ignited and burned by the activated ignition means.
- the transfer hole is a through hole for discharging the flame of the ignition means for igniting the gas generating means to the combustion chamber.
- the inner cylindrical member includes a member provided with a flange at an end opening.
- This communication portion can be formed, for example, by one or more heat transfer holes penetrating in the radial direction in the inner cylinder member. That is, for example, when one of the communication holes is used as the communication portion, the communication portion and the communication hole are substantially the same, but when each through portion is formed by a plurality of communication holes, respectively.
- a so-called heat transfer hole group composed of a plurality of heat transfer holes is formed at predetermined intervals in the circumferential direction of the inner cylinder member.
- the heat transfer hole is desirably formed to have an inner diameter of 1 to 4 mm, preferably 1.8 to 3.2 mm.
- the plurality of communication portions may have an angle of ejection of a flame or a heat mist of the igniting means ejected from the plurality of communication portions at an angle of 60 ° on the right and left with respect to an axis orthogonal to the center of the communication portion. As described above, it is desirable that the angle is adjusted within a horizontal angle range of preferably 90 ° or more.
- the above problem can be solved by a gas generator in which the internal pressure of the housing becomes maximum 5 to 20 milliseconds after the application of the ignition current when the gas generator is operated.
- the surface area of the gas generating agent ignited 2 milliseconds after applying the ignition current to the igniter is 30% to 90% or more of the surface area of all the gas generating agents initially contained in the combustion chamber. Preferably, it is 40 to 60% or more.
- the gas generating agent contained in the combustion chamber is ignited at once by the flame of the igniting means ejected from the communication portion, and starts combustion. be able to. That is, it is possible to improve the ignitability of the gas generating agent in the early stage of the operation of the gas generator.
- an inner cylinder member that partitions at least the inside of the housing into a combustion chamber and an ignition means accommodating chamber is disposed, and is formed on a peripheral surface of the inner cylinder member in a circumferential direction.
- the communication part that allows communication between the two chambers must have the center angle between adjacent communication parts adjusted to 60 ° or less, but other configurations, such as the composition and shape of the gas generating means and the gas
- the presence or absence of a coolant or a filter for cooling and Z or purifying the working gas generated by the combustion of the generating means, or the overall shape of the housing can be appropriately adjusted according to the operating performance.
- the gas generating means that generates working gas by burning is not based on inorganic azides other than the azide-based gas generators that have been widely used in the past, such as sodium azide (sodium azide).
- Non-azide gas generating agents can also be used.
- the size and number of gas outlets formed in the housing, the size and overall shape of the housing, and the like can be appropriately adjusted according to the operating performance and the accommodation space.
- the gas generator for an airbag described above is housed in a module case together with an airbag (bag) that introduces and inflates the gas generated by the gas generator, and serves as an airbag device.
- the gas generator operates in conjunction with the detection of the impact by the impact sensor, and discharges the working gas from the gas outlet of the housing. This working gas flows into the airbag, which breaks the module cover and bulges out, creating a cushion between the rigid structure in the vehicle and the occupant that absorbs shock.
- the present invention relates to a gas generator for an air bag having a structure that allows use of a gas generating agent having poor ignitability, and furthermore, even if such a gas generating agent is used in an early stage of operation.
- the gas generator can exhibit sufficient operation performance. That is, if the properties of the gas generant used (eg, combustion performance) change Even so, a gas generator that achieves an initial operating performance or an operating performance close to this can be realized.
- an airbag gas generator having such an effect is realized by a simple structure.
- the gas generator for the air bag in a 60 liter SUS (stainless steel) tank, seal the tank at room temperature, and connect to the external ignition electric circuit.
- the pressure rise change in the tank is measured from 0 to 200 milliseconds by setting the ignition circuit switch on (ignition current application) time to 0 using a pressure transducer installed in the evening.
- Each measurement data is finally processed as a tank pressure / time curve by computer processing to obtain a curve for evaluating the operating performance of the gas generator (hereinafter referred to as “tank curve”).
- tank curve a curve for evaluating the operating performance of the gas generator
- the ignition current application time is set to 0, and the change in the pressure is measured for a time of 0 to 200 milliseconds to obtain the temporal change of the pressure inside the housing.
- the time until the internal pressure of the housing becomes maximum that is, the maximum internal pressure reaching time can be specified.
- the maximum tank pressure in the present invention is the maximum pressure in the stainless steel tank in this tank combustion test, and the maximum internal pressure is the maximum pressure in the housing when the gas generator is operated. (That is, the maximum housing internal pressure).
- FIG. 1 is a longitudinal sectional view showing a preferred embodiment of the gas generator of the present invention.
- FIG. 2 is a schematic view showing an airbag device of the present invention.
- FIG. 3 is a tank curve of the tank test shown in the example.
- FIG. 4 is a horizontal sectional view of a main part of the gas generator shown in FIG.
- FIG. 1 is a schematic longitudinal sectional view showing one embodiment of a gas generator for an airbag of the present invention.
- the gas generator shown in FIG. 1 has an ignition means composed of an electric igniter 6 and a transfer charge 7 in a housing 3 having a gas outlet 11, and an air bag is inflated by the operation of the ignition means. And a gas generating means (ie, gas generating agent 8) for generating a working gas for storing the gas, and a gas is supplied between the combustion chamber 9 in which the gas generating agent 8 is stored and the peripheral wall of the housing 3.
- a coolant / fill means ie, coolant 5 for cooling the working gas generated by the combustion of the generator 8 is provided.
- a differential member 18 having a cylindrical portion 19 is arranged.
- the housing 3 is formed by a diffuser shell 1 in the shape of a closed cylinder and a chrome palm shell 2 in the shape of a bottomed cylinder, and both shells are formed at respective openings.
- the outer flange portions 53 and 58 are welded and integrated. Among them, the peripheral wall of the closure shell is formed so that the flange portion 53 side extends radially outward.
- a cylindrical inner cylinder member 4 having a flange portion 24 joined to the inner surface of the ceiling of the housing is disposed inside the housing.
- the inside of the inner cylinder member 4 is provided with an ignition means storage chamber 10,
- the outside is a combustion chamber 9. Both chambers are formed so as to be able to communicate with each other through a heat transfer hole 14 formed on the peripheral surface of the inner cylinder member 4.
- the ignition means accommodating chamber 10 includes an igniter 6 that receives an operation signal (ie, an ignition current for activation) and operates, and a transfer charge 7 that is ignited and burned by the operation of the igniter.
- the combustion chamber 9 is ignited and burned by the flame of the ignition means (the flame of the transfer agent 7 in the present embodiment) to generate working gas for inflating the airbag.
- the gas generating agent 8 is stored.
- the igniter 6 constituting the ignition means is fixed at its lower end by caulking the lower end opening of the inner cylinder member 4, and the transfer charge 7 is disposed immediately above the igniter 6.
- the heat transfer hole 14 formed on the peripheral surface of the inner cylinder member 4 is located on the side of the inner cylinder member opposite to the side on which the igniter is fixed (ie, on the side of the transfer charge 7 in the drawing). Is formed.
- the fire hole 14 is formed within a range of less than 30% of the axial length of the inner cylindrical member 4 from the end on which the flange is formed. .
- the gas generating agent is ignited by the flame or heat mist of the transfer charge ejected from the transfer hole 14.
- the ignition area of the gas generating agent 2 ms after the application of the ignition current can be adjusted by adjusting the formation position (height) of the transfer hole 14. For example, if the axial length of the inner cylinder member is about 29 mm and the heat transfer hole is formed at a position 7 mm from the flange end face, two milliseconds after the application of the ignition current, It is conceivable that 50% of the total surface area of the initially charged gas generant ignites.
- the inner cylinder member 4 to which the igniter 6 is fixed by caulking the end is accommodated in an opening 60 of a closure shell 2 to be described later.
- a tubular portion 61 bent inside the housing 3 is formed integrally with the opening 60, and the tubular portion 61 and the inner tubular member 4 are welded to each other. . Since the cylindrical portion 61 is bent inside the housing 3, only the cylindrical portion 61 does not protrude outside the housing 3 in the axial direction. The height can be reduced, and thus the height of the entire gas generator can be reduced. Conversely, if the gas generator thus formed is formed at the same height as the gas generator having the cylindrical portion 61 bent outside the housing 3, even if the gas generator has the same height and outer diameter, Therefore, the internal volume of the housing can be made sufficiently large. Further, the cylindrical portion 61 can support a substantially annular underplate 22 that supports the gas generating means.
- a cylindrical coolant 5 formed by using a laminated wire mesh or the like is supported by a bent portion formed at an end of each of the shells 1 and 2, and is disposed so as to be substantially improved with the inner peripheral surface of the housing.
- a gap 20 is formed between the outer peripheral surface of the coolant 5 and the inner peripheral surface of the housing 3 as a working gas flow path. The gap 20 allows the coolant 5 to function completely and effectively.
- the coolant 5 one that does not swell outward in the radial direction due to the pressure when the working gas passes is suitably used. This is because if the coolant 5 swells due to the passage of the gas generating means, the gap 20 secured between the coolant 5 and the inner peripheral surface of the housing is closed, and effectively functions as a gas flow path. This is because it is no longer possible. Therefore, the coolant 5 shown in the present embodiment has a tensile strength in the radial direction of 12054N (123 kgf).
- a deflector member 18 is arranged between the end face of the coolant 5 and the inner surface of the diffuser shell 1.
- the deflector member 18 is useful when a gas generating agent 8 that generates a fluid or a semi-fluid combustion product by combustion is used.
- the combustion products generated by the combustion of the gas generating agent are transferred to the deflector member. This is because it can be removed by adhering to the 18 cylindrical portion 19 or by dropping after collision.
- the annular portion 16 abutting on the end face of the coolant 5 is formed as having appropriate elasticity, so that as the coolant 5 disposed radially outside the combustion chamber 9, Wire mesh coolant 5 with less expansion and contraction in the axial direction can also be used.
- the deflector member 18 has a wall portion 17 that is in contact with the inner peripheral surface of the coolant 5 and is integrally formed with the annular portion 16. Thereby, the positioning and fixing of the coolant 5 and the so-called short path in which the working gas is exhausted without passing through the coolant can be prevented.
- the igniter 6, which is activated by applying an ignition current for operation, ignites the explosive charge 7 and burns, and the flame is transmitted to the inner cylinder member 4.
- the gas is discharged into the storage space of the gas generating agent 8 through the hole 14.
- the flame of the transfer charge 7 ignites and burns the gas generating agent 8. Even if a part of the flame passes directly through the coolant 5, the cylindrical shape of the deflector member 18 5 In this case, it is possible to prevent the gas from being spouted from the gas outlet 11 as it is.
- the working gas generated from the gas generating agent 8 ignited by the flame of the transfer charge 7 passes through the coolant 5 and the gap secured between the outer peripheral surface of the coolant 5 and the inner peripheral surface of the housing 3. Reach within 0.
- Embodiment 2 of the invention If the working gas that has passed through the coolant 5 contains fluid or semi-fluid combustion products, it collides with the cylindrical portion 19 of the deflector member 18 located in the gap 20 -It will adhere and be removed from the working gas.
- Embodiment 2 of the invention
- FIG. 1 is a schematic longitudinal sectional view showing one embodiment of a gas generator for an airbag of the present invention.
- the gas generator shown in this figure has an electric outlet in a housing 3 having a gas outlet 11.
- Igniting means composed of an igniter 6 and a transfer charge 7; and gas generating means (i.e., a gas generating agent 8) for generating a working gas for inflating an airbag by operating the igniting means.
- a coolant Z filter means (that is, a coolant 5) for cooling the working gas generated by the combustion of the gas generating agent 8 is provided between the combustion chamber 9 for housing the gas generating agent 8 and the peripheral wall of the housing 3. ).
- a deflector member 18 having a cylindrical portion 19 is disposed at an end of the coolant 5 on the diffuser shell 1 side.
- the housing 3 is formed by a diffuser shell 1 in the shape of a closed cylinder and a mouthpiece 2 in the shape of a bottomed cylinder. Both shells are welded by outward flange portions 53, 58 formed in the respective openings. It is integrated. Among them, the peripheral wall of the bay palm is formed such that the flange portion 53 side extends outward in the radial direction.
- a cylindrical inner cylinder member 4 having a flange 24 joined to the inner surface of the ceiling of the housing is disposed in the housing, and the inside of the inner cylinder member 4 is provided inside the ignition means storage chamber 10.
- the outside is a combustion chamber 9.
- Both chambers are formed so as to be able to communicate with each other by a plurality of communicating portions formed on the peripheral surface of the inner cylinder member 4.
- this communication portion is embodied as a heat transfer hole 14, and each communication portion is formed by one heat transfer hole 14 having an inner diameter of 1.8 to 3.2 mm. It is configured. However, it is also possible to combine a plurality of heat transfer holes having a smaller diameter (as a heat transfer hole group) to form a communication portion.
- the heat transfer hole 14 is formed within a range where the distance (L) from the end of the inner cylinder member 4 is 30 to 70% of the axial length (L 1) of the inner cylinder member. Then, the ignition performance of the gas generating agent 8 can be improved. For example, as shown in Fig. 1, a heat transfer hole 14 was formed at a position 10 mm from the end of the diffuser shell side using an inner cylindrical member with an axial length (L 1) of 29 mm. In this case, the internal pressure of the housing becomes maximum approximately 8.2 milliseconds after the application of the ignition current.
- the axial length of the inner cylinder member 4 is, in principle, gas generation It is based on the condition in which it is placed in the gas generator, but in most cases, there is no particular difference even if it is based on the condition before being assembled into the gas generator.
- the ignition means accommodation chamber 1 includes an igniter 6 that receives an operation signal (ie, an ignition current for activation) and operates, and a transfer charge 7 that is ignited and burned by the operation of the igniter. Ignited means is accommodated.
- the igniter 6 constituting the igniting means is fixed by caulking the lower end of the igniter 6 at the lower end opening of the inner cylindrical member 4, and the transfer charge 7 is disposed immediately above the igniter 6.
- the combustion chamber 9 contains a gas generating agent 8 which is ignited and burned by the flame of the ignition means (the flame of the transfer agent 7 in the present embodiment) to generate a working gas for inflating the airbag. ing.
- the center hole ⁇ between adjacent communicating portions is 60 ° or less, as shown in the horizontal cross-sectional view of the inner cylinder member 4 in FIG. It is adjusted so that Thereby, the interval between the adjacent heat transfer holes 14 can be reduced, and the contact area between the flame of the transfer charge ejected from the heat transfer holes 14 and the gas generating agent in the combustion chamber can be increased. . Therefore, the ignition area of the gas generating agent 8 in the early stage of the gas generator operation can be increased, and the ignition performance of the gas generating agent 8 can be improved.
- the inner cylinder member 4 has 12 heat transfer holes 14 with an inner diameter of 1.85 mm in the circumferential direction (ie, The center angle between adjacent communicating parts is 30 °), and eight via holes with an inner diameter of 2.2 mm in the circumferential direction (that is, the central angle between adjacent communicating parts is 45 °), the inner diameter 2
- Six 6 mm heat transfer holes 14 can be formed in the circumferential direction (ie, the central angle between adjacent communication portions is 60 °).
- the initial ignition performance of the agent can be improved.
- the flames and heat mist of the ignition means (in this embodiment, the transfer charge 7) ejected from the plurality of communicating portions (the transfer holes 14 in the present embodiment) are Orthogonal to It is desirable to adjust so as to eject the gas within the range of horizontal angle of more than 60 ° to the left and right with the axis L as the center.
- the inner cylinder member 4 to which the igniter 6 is fixed by crimping the end is accommodated in an opening 60 of a closure shell 2 described later, and is welded to the closure shell 2 with the igniter 6 fixed.
- a cylindrical portion 61 bent inside the housing 3 is formed integrally with the opening 60, and the cylindrical portion 61 and the inner cylindrical member 4 are welded to each other. Since the cylindrical portion 61 is bent inside the housing 3, only the cylindrical portion 61 does not protrude outside the housing 3 in the axial direction, and the entire height of the housing 3 itself is correspondingly increased. And the height of the entire gas generator can be reduced.
- the gas generator thus formed is formed at the same height as the gas generator having the cylindrical portion 61 bent outside the housing 3, even if the gas generator has the same height and outer diameter, Therefore, the internal volume of the housing can be made sufficiently large. Further, the cylindrical portion 61 can support a substantially annular underplay h22 that supports the gas generating means.
- a cylindrical coolant 5 formed by using a laminated wire mesh or the like is supported by a bent portion formed at an end of each of the shells 1 and 2, and is disposed so as to be substantially paired with the inner peripheral surface of the housing.
- a gap 20 is formed between the outer peripheral surface of the coolant 5 and the inner peripheral surface of the housing 3 to serve as a working gas flow path. The gap 20 allows the coolant 5 to function completely and effectively.
- the coolant 5 one that does not swell outward in the radial direction due to the pressure when the working gas passes is suitably used. This is because if the coolant 5 swells due to the passage of the gas generating means, the gap 20 secured between the coolant 5 and the inner peripheral surface of the housing is closed, and effectively functions as a gas flow path. This is because it cannot be done. Therefore, the coolant 5 shown in this embodiment is formed to have a tensile strength in the radial direction of 12054N (123 kgf).
- the deflector member 18 is useful when a gas generating agent 8 that generates a fluid or a semi-fluid combustion product by combustion is used.
- the combustion products generated by the combustion of the gas generating agent can be removed by attaching to the cylindrical portion 19 of the deflector member 18 or dropping after the collision.
- the annular portion 16 abutting on the end face of the coolant 5 is formed as having appropriate elasticity, so that as the coolant 5 arranged radially outside the combustion chamber 9, It is also possible to use a wire mesh coolant 5 which has little expansion and contraction in the axial direction.
- the deflector member 18 has a wall portion 17 that is in contact with the inner peripheral surface of the coolant 5 and is integrally formed with the annular portion 16. Thereby, the positioning and fixing of the coolant 5 and the so-called short path in which the working gas is exhausted without passing through the coolant can be prevented.
- the igniter 6, which is activated by applying an ignition current for operation, ignites the explosive charge 7 and burns, and the flame is transmitted to the inner cylinder member 4.
- the gas is discharged into the storage space of the gas generating agent 8 through the hole 14.
- the flame of the transfer charge 7 ignites and burns the gas generating agent 8, but even if a part of the flame directly passes through the coolant 5, the cylindrical portion 19 of the deflector member 18 In this case, it is possible to prevent the gas from being spouted from the gas outlet 11 as it is.
- the working gas generated from the gas generating agent 8 ignited by the flame of the transfer charge 7 passes through the coolant 5 and reaches the gap 20 secured between the outer peripheral surface of the coolant 5 and the inner peripheral surface of the housing 3. I do. If the working gas that has passed through the coolant 5 contains fluid or semi-fluid combustion products, it collides with the cylindrical portion 19 of the deflector member 18 located in the gap 20 ⁇ It will adhere and be removed from the working gas.
- a tank test was performed using the gas generator having the structure shown in FIG. With this gas generator
- the inner cylinder member has a length of 29 mm in the axial direction, and a heat transfer hole 14 is formed in the inner cylinder member at a position 7 mm from the end face of the flange portion.
- the number of these holes is 3.2mm in inner diameter and a total of 4 holes are formed at 90 ° intervals in the circumferential direction.
- Figure 3 shows the tank curve.
- the tank maximum pressure was P (kPa), and the tank maximum pressure P
- the tank pressure after 0.25XT milliseconds is 0.25xP (kPa) or less
- the tank pressure after 0.80xT milliseconds is 0.70xP (kPa) or more.
- a tank combustion test was performed using the gas generator shown in Fig. 1, and the time from when the ignition current was applied to when the internal pressure of the housing reached a maximum (hereinafter, also referred to as the housing internal pressure reaching time) was measured.
- the purpose of this embodiment is to confirm the improvement of the ignitability of the gas generating agent due to the shape and arrangement of the communication portion (fire hole). Therefore, as shown in the above (1) or (2), the shape and arrangement of the communication part (fire hole) are different, and in other configurations, if the gas generator is common, It is possible to confirm substantially the same effects as in the example. That is, in order to confirm the effects of the present invention, any gas generating agent used in the gas generator used in the above (1) or (2) may be used as long as the generated gas amount and the linear burning rate are the same. Also, if the gas generator has the same void volume that can contribute to the combustion of the gas generating agent, the same effect can be confirmed.
- Embodiment 3 of the invention is to confirm the improvement of the ignitability of the gas generating agent due to the shape and arrangement of the communication portion (fire hole). Therefore, as shown in the above (1) or (2), the shape and arrangement of the communication part (fire hole) are different, and in other configurations, if the gas generator is common,
- the gas discharge port 11 and the fire hole 14 are each closed by a sealing tape 15, and the gas generating agent 8 is supported by the under plate 22 and housed in the combustion chamber .
- the member described as age 18 in the present embodiment can also function as a mist collecting member or a flameproof plate with a similar structure.
- FIG. 2 shows an embodiment of the airbag apparatus of the present invention including a gas generator using an electric ignition type ignition means.
- the airbag device includes a gas generator 200, an impact sensor 201, a control unit 202, a module case 203, and an airbag 204.
- the gas generator 200 uses the gas generator described with reference to Fig. 1, and its operation performance is adjusted in the early stage of the gas generator operation so as to minimize impact on the occupants. ing.
- the impact sensor 201 can be composed of, for example, a semiconductor acceleration sensor.
- a semiconductor-type acceleration sensor four semiconductor strain gauges are formed on a beam of a silicon substrate that bends when acceleration is applied, and these semiconductor strain gauges are connected in a bridge.
- the beam deflects, causing strain on the surface. Due to this strain, the resistance of the semiconductor strain gauge changes, and the change in resistance is detected as a voltage signal proportional to the acceleration.
- the control unit 202 includes an ignition determination circuit, and a signal from the semiconductor acceleration sensor is input to the ignition determination circuit.
- the control unit 202 starts the calculation, and when the calculation result exceeds a certain value, the ignition signal of the igniter 6 of the gas generator 200 (ie, the operation signal) (Ignition current for).
- the module case 203 is formed of, for example, polyurethane and includes a module cover 205.
- the airbag 204 and the gas generator 200 are accommodated in the module case 203 and configured as a pad module.
- This pad module is usually mounted on the steering wheel 207 when it is mounted on the driver's seat side of an automobile.
- the airbag 204 is made of nylon (for example, nylon 66) or polyester.
- the bag opening 206 surrounds the gas outlet of the gas generator, and is fixed to the flange of the gas generator in a folded state.
- a semiconductor type acceleration sensor 201 detects an impact at the time of a car collision
- the signal is sent to the controller unit 202, and when the impact signal from the sensor exceeds a certain value, the control unit 202 starts calculation.
- an operation signal is output to the igniter 6 of the gas generator 200.
- the igniter 4 operates to ignite the gas generating agent, and the gas generating agent burns to generate gas.
- This gas is blown into the airbag 204, whereby the airbag breaks through the module cover 205 and inflates, forming a cushion between the steering wheel 207 and the occupant to absorb shock.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Bags (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60129248T DE60129248T2 (de) | 2000-12-27 | 2001-12-27 | Gasgenerator zur verwendung bei airbags und airbagvorrichtung |
US10/415,643 US7114746B2 (en) | 2000-12-27 | 2001-12-27 | Air bag-use gas generator and air bag device |
EP01272359A EP1346886B1 (en) | 2000-12-27 | 2001-12-27 | Air bag-use gas generator and air bag device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000396970A JP4542699B2 (ja) | 2000-12-27 | 2000-12-27 | エアバッグ用ガス発生器及びエアバッグ装置 |
JP2000396969A JP4542698B2 (ja) | 2000-12-27 | 2000-12-27 | エアバッグ用ガス発生器及びエアバッグ装置 |
JP2000-396970 | 2000-12-27 | ||
JP2000-396969 | 2000-12-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002051675A1 true WO2002051675A1 (fr) | 2002-07-04 |
Family
ID=26606787
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/011575 WO2002051675A1 (fr) | 2000-12-27 | 2001-12-27 | Airbag et generateur de gaz pour air bag |
Country Status (5)
Country | Link |
---|---|
US (1) | US7114746B2 (ja) |
EP (1) | EP1346886B1 (ja) |
DE (1) | DE60129248T2 (ja) |
TW (1) | TW521052B (ja) |
WO (1) | WO2002051675A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103433220A (zh) * | 2013-08-23 | 2013-12-11 | 上海电气自动化设计研究所有限公司 | 汽车安全气囊引爆组件全自动检测系统 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7806954B2 (en) * | 2005-11-01 | 2010-10-05 | Automotive Systems Laboratory Inc. | Gas generator |
US7900960B2 (en) | 2008-05-13 | 2011-03-08 | Autoliv Asp, Inc. | System for tuning initial onset |
JP5667367B2 (ja) * | 2009-03-06 | 2015-02-12 | オートリブ エー・エス・ピー・インク | エアバッグ装置及びこれに用いるガス発生器 |
JP6749788B2 (ja) * | 2016-05-18 | 2020-09-02 | 株式会社ダイセル | ガス発生器 |
WO2018125526A1 (en) * | 2016-12-28 | 2018-07-05 | Key Safety Systems, Inc. | Inflator |
US20210246855A1 (en) * | 2020-02-09 | 2021-08-12 | Velossa Tech Engineering Inc. | Interchangeable intake manifold assemblies |
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JPH1159318A (ja) * | 1997-08-25 | 1999-03-02 | Nippon Kayaku Co Ltd | ガス発生器 |
JPH11189124A (ja) * | 1997-12-26 | 1999-07-13 | Daicel Chem Ind Ltd | エアバッグ用ガス発生器及びエアバッグ装置 |
JPH11189126A (ja) * | 1997-12-26 | 1999-07-13 | Daicel Chem Ind Ltd | エアバッグ用ガス発生器及びエアバッグ装置 |
JPH11217055A (ja) * | 1997-11-05 | 1999-08-10 | Nippon Kayaku Co Ltd | ガス発生器 |
JPH11334517A (ja) * | 1997-12-26 | 1999-12-07 | Daicel Chem Ind Ltd | エアバッグ用ガス発生器及びエアバッグ装置 |
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US5005486A (en) * | 1989-02-03 | 1991-04-09 | Trw Vehicle Safety Systems Inc. | Igniter for airbag propellant grains |
US4950458A (en) * | 1989-06-22 | 1990-08-21 | Morton International, Inc. | Passenger automotive restraint generator |
US4998751A (en) * | 1990-03-26 | 1991-03-12 | Morton International, Inc. | Two-stage automotive gas bag inflator using igniter material to delay second stage ignition |
DE9013131U1 (de) * | 1990-09-15 | 1990-11-22 | Bayern-Chemie Gesellschaft für flugchemische Antriebe mbH, 8261 Aschau | Gasgenerator |
DE4208843A1 (de) | 1992-03-19 | 1993-09-30 | Temic Bayern Chem Airbag Gmbh | Gasgenerator mit Filter für eine Fahrer-Schutzvorrichtung |
JPH07232613A (ja) | 1993-12-28 | 1995-09-05 | Nippon Kayaku Co Ltd | エアバッグ用ガス発生器およびスクイブ |
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WO1996010495A1 (fr) | 1994-09-30 | 1996-04-11 | Sensor Technology Co., Ltd. | Generateur de gaz pour coussin gonflable de securite |
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2001
- 2001-12-27 DE DE60129248T patent/DE60129248T2/de not_active Expired - Lifetime
- 2001-12-27 US US10/415,643 patent/US7114746B2/en not_active Expired - Lifetime
- 2001-12-27 TW TW090132505A patent/TW521052B/zh active
- 2001-12-27 EP EP01272359A patent/EP1346886B1/en not_active Expired - Lifetime
- 2001-12-27 WO PCT/JP2001/011575 patent/WO2002051675A1/ja active IP Right Grant
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JPH11189126A (ja) * | 1997-12-26 | 1999-07-13 | Daicel Chem Ind Ltd | エアバッグ用ガス発生器及びエアバッグ装置 |
JPH11334517A (ja) * | 1997-12-26 | 1999-12-07 | Daicel Chem Ind Ltd | エアバッグ用ガス発生器及びエアバッグ装置 |
JPH11348711A (ja) * | 1997-12-26 | 1999-12-21 | Daicel Chem Ind Ltd | エアバッグ用ガス発生器及びエアバッグ装置 |
JP2000198409A (ja) * | 1998-11-04 | 2000-07-18 | Daicel Chem Ind Ltd | エアバッグ用ガス発生器及びそのク―ラント |
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Cited By (1)
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CN103433220A (zh) * | 2013-08-23 | 2013-12-11 | 上海电气自动化设计研究所有限公司 | 汽车安全气囊引爆组件全自动检测系统 |
Also Published As
Publication number | Publication date |
---|---|
EP1346886A4 (en) | 2005-03-30 |
TW521052B (en) | 2003-02-21 |
DE60129248T2 (de) | 2007-10-11 |
DE60129248D1 (de) | 2007-08-16 |
US20040051289A1 (en) | 2004-03-18 |
US7114746B2 (en) | 2006-10-03 |
EP1346886A1 (en) | 2003-09-24 |
EP1346886B1 (en) | 2007-07-04 |
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