WO2002036394A1

WO2002036394A1 - Gas generator

Info

Publication number: WO2002036394A1
Application number: PCT/JP2001/009358
Authority: WO
Inventors: Hiroyuki Ochi; Seigo Taguchi; Yoshiyuki Kishino
Original assignee: Nippon Kayaku Kabushiki-Kaisha
Priority date: 2000-10-30
Filing date: 2001-10-25
Publication date: 2002-05-10
Also published as: AU2002212681A1; JP4533524B2; JP2002127864A

Abstract

A gas generator (P1), comprising a long cylindrical housing (1), gas generating agent (5) charged into the housing (1), an ignitor (6) fitted to the cover member (10) of the housing (1), a pressurized combustion chamber (3) provided in the cover member (10) and sealed from the inside and outside of the housing (1), an inflammation nozzle (4) allowed to communicate with the inside of the pressurized combustion chamber (3) and axially extended through the inside of the housing, inflammation holes (31) allowing the inside of the inflammation nozzle (4) to communicate with the inside of the housing, a first inflammation chemical (7) charged into the pressurized combustion chamber (3) and ignited and burned by the ignitor (6), and a second inflammation chemical (8) axially charged in the inflammation nozzle (4) and ignited and burned by the combustion heat of the first inflammation chemical (7).

Description

Specification

Gas generator technical field

The present invention relates to a gas generator suitable for inflating and deploying a passenger airbag. Background art

As an example of a gas generator for inflating and deploying an airbag, see Japanese Patent Application Laid-Open No. Sho 56-124455, US Pat. No. 5,799,973, US Pat. No. 5,931,499. No. 6, JP-A-7-215170. These gas generators (or, mainly, airbags for passenger seats) are inflated and developed. This gas generator has a plurality of tubular igniters in a long cylindrical housing, In this gas generator, first, the ignition material in the first igniter segment is burned, and then the igniter segments connected by the squib are used. The igniting material in the igniter segment 2 burns with a time difference to burn the gas generating propellant pellets in the housing, whereby the airbag is inflated and deployed in two stages.

As described above, the conventional passenger-side gas generator has a structure in which the igniter segments are connected by a squib, and the gas generating agent loaded in the long cylindrical housing is burned. The structure of the vessel was complicated. In addition, since a complicated operation of embedding the squib in the ignition material was required, it was difficult to reduce the production cost of the gas generator. An object of the present invention is to provide a gas generator capable of instantaneously shifting to general combustion of a gas generating agent while simplifying the structure and reducing the manufacturing cost. Disclosure of invention,

The gas generator according to claim 1 of the present invention includes a long cylindrical housing having both ends closed, ignition means mounted on at least one shaft end of the housing, and ignition means. A first transfer agent that is provided on at least one of the axial ends of the housing and is ignited and burned by the ignition means; and a heat transfer agent that extends in the axial direction inside the housing and is heated by the combustion heat of the first transfer agent. It comprises a second transfer agent that is ignited and burned, and a gas generating agent that is loaded along the axial direction inside the housing and is burned by the combustion heat of the second transfer agent.

In this gas generator, the first transfer agent is ignited and burned by the ignition means, and then the second transfer agent is ignited and burned by the heat of combustion of the first transfer agent. By transmitting the heat energy such as flame in the axial direction of the housing, it instantaneously shifts to the overall combustion of the gas generating agent.

As a result, the entire combustion of the gas generating agent can be performed only by the first and second transfer agents, and there is no need to bury a squib in the ignition material as in a conventional gas generator. The structure can be simplified and the manufacturing cost can be reduced.

In the gas generator described in claim 1, an ignition means, a first and a second transfer agent are provided at each shaft end of the housing, respectively, and the structure can also be adopted. As a result, by simultaneously firing the ignition means with a time difference, it is possible to adjust the amount of generated gas and the pressure rise, thereby enabling the deployment state of the airbag to be controlled. The gas generator according to claim 2 of the present invention comprises: a long cylindrical housing having both ends closed; ignition means mounted on at least one shaft end of the housing; A pressure combustion chamber provided at at least one of the shaft ends of the housing and sealed from inside and outside of the housing; a transmission nozzle communicating with the pressure combustion chamber and extending in the housing in the axial direction; A plurality of fire holes formed in the axial direction of the fire nozzle to communicate the inside of the fire nozzle with the housing; a first transfer agent charged in the pressure combustion chamber and ignited and burned by the ignition means; A second transfer agent loaded axially in the fire nozzle and ignited and burned by the combustion heat of the first transfer agent, and a second transfer agent loaded axially in the housing and passed through each transfer hole of the transfer nozzle Erupted That it is made and a gas generating agent is combusted by combustion heat of the second transfer charge agent.

In this gas generator, the first transfer agent in the pressure combustion chamber is ignited and burned by the ignition means, and then the second transfer agent in the transfer nozzle is heated by the heat of combustion of the first transfer agent. Ignition combustion causes the thermal energy, such as flame from the ignition means, to propagate in the axial direction of the housing, instantaneously shifting to the overall combustion of the gas generating agent.

As a result, the entire combustion of the gas generating agent can be performed only by the pressure combustion chamber, the transfer nozzle, the first and second transfer agents, and a squib is provided in the ignition material as in a conventional gas generator. Since there is no need to bury them, the structure can be simplified and the manufacturing cost can be reduced. '

The gas generator described in claim 2 also employs a structure in which an ignition means, a pressure combustion chamber, a fire nozzle, and first and second transfer agents are provided at each shaft end of the housing. it can. Thus, by igniting each ignition means simultaneously or with a time difference, it is possible to adjust the gas generation amount and the pressure rise, and to control the deployment form of the air pug. A gas generator according to claim 3 of the present invention is the gas generator according to claim 2, wherein the inner diameter of the transfer nozzle is smaller than the inner diameter of the pressure combustion chamber.

As a result, the heat energy of the flame and high-temperature gas generated by the combustion of the first transfer agent in the pressure combustion chamber can be concentrated and propagated into the transfer nozzle and flow into the transfer nozzle. Ignited and burned. The gas generator according to claim 4 of the present invention is the gas generator according to claim 2 or claim 3, wherein a plurality of the heat transfer holes are formed at a pitch between the holes near the pressure combustion chamber. It is formed so that the distance between holes and Sochi increases as the distance from the pressure combustion chamber increases.

As a result, a large number of heat transfer holes are formed in the vicinity of the pressure combustion chamber of the transfer nozzle, so that high-temperature gas and the like flowing into the transfer nozzle from the pressure combustion chamber can be quickly released into the housing. It is possible to prevent damage to the transfer nozzle due to the pressure of the high-temperature gas generated in the room.

The gas generator according to claim 5 of the present invention is the gas generator according to claim 1 or claim 2, wherein at least one of the first and second transfer agents is used. The calorific value by ignition combustion is 350 JZg or more, and the number of moles of gas generated by combustion is 0.5 Nio1Z100 g or more.

As a result, the second charge can be ignited and burned instantly because the second charge is ignited and then immediately burned by heat generation. In addition, the second igniting agent is also ignited by the first igniting agent and immediately burned by heat generation, so that the gas generating agent can be instantaneously burned. Therefore, the gas generating agent can be instantaneously transferred to the overall combustion without using a fuse that propagates the flame generated by the ignition means. It becomes possible. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a gas generator according to an embodiment of the present invention. FIG. 2 is a view as viewed from an arrow AA in FIG. FIG. 3 is a sectional view showing a modification of the gas generator in the embodiment of the present invention. FIG. 4 is a sectional view showing a modification of the gas generator in the embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

A gas generator according to an embodiment of the present invention will be described with reference to FIG. 1 to FIG. The gas generator according to the embodiment of the present invention mainly inflates and deploys a passenger airbag, and burns a gas generating agent by one ignition means (see FIGS. 1 and 2). A description will be given of an apparatus in which a gas generating agent is burned by a plurality of ignition means (see FIGS. 3 and 4).

The gas generator P 1 shown in FIG. 1 includes a housing 1, a filling material 2, a pressure combustion chamber 3, a firing nozzle 4, a gas generating agent 5, an ignition means 6, a first and a And second transfer agents 7 and 8. As shown in FIG. 1, the housing 1 includes an outer cylindrical member 9 having both ends opened, and two lid members 10 and 11 for closing both ends of the outer cylindrical member 9. The housing 1 is configured such that each of the lid members 10, 11 is fitted into each opening of the outer cylinder 9, and each opening of the outer cylinder 9 is bent radially inward to form a sealed space inside. This is the structure that forms S. The housing 1 is formed in a long cylindrical shape having both ends closed with the lid members 10 and 11 serving as shaft ends.

As shown in FIG. 1, the outer cylinder 9 has a sealed space S and an airbag. A plurality of communicating gas discharge holes 9a are formed. As shown in FIG. 2, the gas discharge holes 9a are formed at predetermined intervals in the axial direction and the circumferential direction of the outer cylindrical member .9. Each of the gas discharge holes 9 a is closed by a burst plate 12 attached to the inner periphery of the outer cylinder 9. The paste plate 12 is formed of a metal foil such as aluminum, and plays a role in preventing moisture inside the housing 1 and adjusting the internal pressure.

As shown in FIG. 1, the lid member 10 has a stepped space S1 forming the pressure combustion chamber 3. As shown in FIG. Does the stepped space S1 open into the sealed space S and extend toward the shaft end side concentrically with the shaft center a of the housing 1? The stepped space S 1 has a large-diameter space 13 and a small-diameter space 14 connected from the sealed space S side, and is formed by forming a screw on the inner periphery of the large-diameter space 13. . The lid member 11 is formed with a storage space S2 that opens into the sealed space S and extends toward the shaft end of the housing 1.

As shown in FIG. 1, the filler material 2 is formed into a cylindrical shape by, for example, an aggregate of knitted wire mesh and crimp-woven metal wire. The filler material 2 is inserted into the housing 1 and is located between the lid members 10 and 11 '. The shaft end of the filter member 2 on the side of the lid member 11 is closed by a sheet packing 16 interposed between the filter member 2 and the lid member 11. A cylindrical filter support member 15 is inserted into the inner periphery of the filter member 2. The filter material 2 is installed in the stepped space S1 and the storage space S2 at both ends of the filter support material 15 to form an annular gas passage space between the filter material 2 and the outer cylindrical material 9. Forming S3. A plurality of gas passage holes 15 a communicating with the inside of the filter material 2 are formed in the filter support material 15. As shown in FIG. 2, the gas passage holes 15a are formed at predetermined intervals in the axial direction and the circumferential direction of the filter support member 15. The filter support material 15 is made of a porous steel plate (punched It is manufactured by forming a metal) or an expandable material into a cylindrical shape. .

As shown in FIG. 1, the pressure combustion chamber 3 is formed in a stepped space S1 in the lid member 10. This pressure combustion chamber 3 is stepped with a holder 1 2 1. The pressure combustion chamber 3 is constituted by a small-diameter cavity 14 of a cavity S 1, and the holder 21 is screwed onto the inner periphery of the large-diameter cavity 13. It is defined by the sealed space S of the housing 1. A stepped hole 22 extending in the axial direction coaxially with the axis of the housing 1 is formed in the holder 12. The stepped hole 22 of the holder 21 is closed by a rupture plate 23. The rupture plate 23 is formed of a metal foil such as aluminum, and seals the inside of the pressure combustion chamber 3 from inside and outside of the housing 1.

As shown in FIG. 1, the transfer nozzle 4 is formed in a bottomed cylindrical shape whose one end is open. The heat transfer nozzle 4 is mounted in the stepped hole 22 of the holder 1 2 1 on the enclosing side, and is concentric with the axis of the housing 1 and extends in the filter support material 1.5 in the axial direction. Have been. The open end of the transfer nozzle 4 is in contact with the rupture plate 23, and the rupture of the plate 23 enables communication with the pressure combustion chamber 3. The inner diameter d of the transfer nozzle 4 is set to be smaller than the inner diameter of the small-diameter space 14 of the pressure combustion chamber 3, and the extension length L of the transfer nozzle 4 is between each lid member 101. It has an arbitrary length. Preferably, the length between the lid members 10 and 11 is set to a length of less than 1-2, and the firing nozzle 4 is disposed in the pressure combustion chamber 3 in a well-balanced manner. Further, a plurality of fire holes 31 are formed in the fire nozzle 4. As shown in FIG. 2, each of the heat transfer holes 31 is arranged in the axial direction and the circumferential direction of the heat transfer nozzle 4, and communicates with the inside of the heat transfer nozzle 4 within the filter support member 15. In addition, each of the heat transfer holes 31 has a smaller pitch Pc between the holes near the pressure combustion chamber 3, and has a hole as the distance from the pressure combustion chamber 3 increases. The intermediate pitch Pc is formed to be large. Each of these fire holes 31 is closed by a rupture plate 32 attached to the outer periphery of the fire nozzle 4. The rupture plate 32 is formed of a metal foil such as aluminum, and seals the inside of the firing nozzle 4 from the inside of the filter support 15.

As shown in FIG. 1, the gas generating agent 5 generates a high-temperature gas by combustion, and is loaded along the axial direction in the filter support 15 of the housing 1. In addition, the gas generating agent 5 is also loaded between the filler material 15 and the firing nozzle 4 until the filling time. The gas generating agent 5 is prevented from being powdered due to vibration by the pressing member 35 and the cushion member 36 mounted between the gas generating agent 5 and the lid member 11. The pressing member 35 is formed in a cylindrical shape, and is stored in the storage space S2 in contact with the lid member 11. The cushion member 36 is disposed between the holding member 35 and the gas generating agent 5, and has a communication hole 36 a communicating the inside of the holding member 35 with the gas generating agent 5 side. As the cushion member 36, a soft material such as silicone rubber or silicone foam material is used. In addition, an ignition veret (AI pellet) 8 is loaded in the mounting hole 37 of the lid member 11 opening into the holding member 35. When the gas generator P 1 is exposed to a high temperature such as 150 ° C. or higher, the igniting pellet 38 ignites spontaneously and burns the gas generating agent 5.

As shown in FIG. 1, the igniting means 6 is composed of, for example, only an igniter (hereinafter, referred to as “igniter 6”) that ignites when energized, and is attached to the lid member 10 from inside the pressure combustion chamber 3. ing. The igniter 6 is protruded into the pressure combustion chamber 3, and is generally ignited based on a collision detection signal from a collision sensor, and emits a flame into the pressure combustion chamber 3.

As shown in FIG. 1, the first transfer agent 7 is loaded into the pressure combustion chamber 3 so as to cover the tip side of the igniter 6. This transfer agent 7 It contains a composition that is ignited and burned by the flame of the device 8 and generates heat by the ignited combustion to generate high-temperature gas.

As the first transfer agent 7, 5-aminotetrazole and boron fine powder are used so that the calorific value by combustion is 3500 J / g or more and the number of moles of gas generated by combustion is 0.5molZl 00g or more. , Molybdenum trioxide and nitric acid rim can be used in prescribed amounts.

As shown in FIG. 1, the second transfer agent 8 is loaded in the transfer nozzle 4 in the axial direction. The transfer agent 8 contains a composition that is ignited and burned by the heat of combustion of the first transfer agent 7 and generates heat by the ignited combustion.

Similar to the first transfer agent 7, the second transfer agent 8 may be a 5-aminotetrazole or a borate so that the calorific value is 3500 J / mol number is 0.5mo1 / 100g or more. Tin fine powder, molybdenum trioxide and nitric acid can be used in a predetermined amount.

The first transfer agent 7 and the second transfer agent 8 may have the same composition. In addition, the composition can be appropriately adjusted. For example, it is assumed that the first transfer agent 7 includes a composition that generates heat by ignition combustion, and the second transfer agent 8 includes a composition that generates heat by ignition combustion and generates a high-temperature gas. Is also good. Still, it is possible to employ a composition containing a composition that generates heat and generates high-temperature gas for both the first and second transfer agents 7, 8 by ignition and combustion.

Next, the operation of the gas generator P1 will be described with reference to FIGS.

When the collision sensor detects the collision of the automobile, the gas generator P1 energizes and ignites the igniter 6, as shown in FIG. By ignition of igniter 6 The flame is jetted into the pressure combustion chamber 3 to ignite and burn the first transfer agent 7. The combustion of the transfer agent 7 generates heat such as a flame and a high-temperature gas in the pressure combustion chamber 3, and the transfer agent 7 is instantaneously burned toward the transfer nozzle 4 by the heat energy. When the combustion of the first transfer agent 7 proceeds and the pressure inside the pressure combustion chamber 3 reaches a predetermined pressure, the rupture plate 23 ruptures and burns, and the inside of the pressure combustion chamber 3 communicates with the inside of the transfer nozzle 4.

The heat and high-temperature gas generated in the pressure combustion chamber 3 propagate and flow into the ignition nozzle 4 to ignite and burn the second transfer agent 8 at the opening side of the ignition nozzle 4. . At this time, since the inner diameter of the ignition nozzle 4 is smaller than that of the pressure combustion chamber 3, the heat and high-temperature gas generated in the pressure combustion chamber 3 are restricted to the opening side of the ignition nozzle 4. It is concentrated and instantaneously ignites and burns the second transfer agent 8.

The ignition and combustion of the transfer agent 8 generates heat such as a flame in the transfer nozzle 4, and the heat transfers the transfer agent 8 instantaneously in the axial direction of the transfer nozzle 4. Then, the rupture plate 32 is burned by the combustion of the second transfer agent 8, and each transfer hole 31 of the transfer nozzle 4 is opened in the filter support member 15. Each of the heat transfer holes 31 is sequentially opened by the axial combustion of the second transfer agent 8, and the heat such as the flame generated in the transfer nozzle 4 is sequentially injected into the filter support 15. Let it. Further, as shown in FIG. 2, the heat of the flame and the like is jetted into the filler support 15 over the circumference of the transfer nozzle 4. As a result, the gas generating agent 5 is ignited and burned in the axial direction from the lid member 10 side of the housing 1 by heat of a flame or the like sequentially ejected from each of the heat transfer holes 31 of the heat transfer nozzle 4 and instantaneously. However, it is shifted to overall combustion. Then, the ignition combustion of the gas generating agent 5 generates a large amount of high-temperature gas in the housing 1.

The high-temperature gas flowing from the pressure combustion chamber 3 into the ignition nozzle 4 is The fuel is released into the holding material 15 through the filler holes 31 near the power combustion chamber 3 until the fill. This is because a large number of heat transfer tubes 31 are formed by reducing the pitch Pc between the holes with respect to the vicinity of the heat transfer chamber 3 so that high-temperature gas is not trapped in the heat transfer nozzles 4 and the filter can be quickly filtered. This is because the structure was made to flow into the support material 15. Thus, it is possible to prevent the fire nozzle 4 from being damaged by the pressure of the high-temperature gas generated in the pressure combustion chamber 3 or the like.

The high-temperature gas generated in the housing 1 flows into the filter material 2 from each gas passage hole 15 a of the filter support material 15, where it passes through the slag collection and cooling to form a gas passage space S 3 Spilled into. Then, the combustion of the gas generating agent 5 proceeds, and when the pressure inside the housing 1 rises to a predetermined pressure, the burst plate 12 ruptures, and the clean gas uniformized in the gas passage space S3 is discharged into each gas. Discharged into the air pug through hole 9a. The airbag is rapidly inflated and deployed by the clean gas released from each gas discharge hole 9a.

Thus, according to the gas generator: P 1, the flame caused by the ignition of the igniter 6 is propagated in the axial direction inside the housing 1 by the ^ 1 and the second transfer agent 7, 8, and the transfer nozzle 4 Since the heat such as the flame is blown out from each of the heat transfer holes 31 into the filter support 15, the combustion of the gas generating agent 5 can be instantaneously transferred to the overall combustion of the housing 1. As a result, the entire combustion of the gas generating agent can be performed only by the pressure combustion chamber 3, the firing nozzle 4, the first and second firing agents 7, 8, and the ignition material, as in the conventional gas generator, can be used. There is no need to embed a squib inside, simplifying the structure and reducing manufacturing costs. In the gas generator P1, the combustion of the gas generating agent as a whole can be enhanced by the propagation of the flame and the like by the first and second transfer agents 7, 8, and the airbag is instantly inflated and deployed. This is possible. Also, by setting the inner diameter d of the transfer nozzle 4 to be smaller than the inner diameter of the pressure combustion chamber 3, heat such as flame generated in the pressure combustion chamber 3 and high-temperature gas can be transferred to the transfer nozzle 4. It can propagate and flow in a concentrated manner, and the second transfer agent 8 can be ignited and burned instantaneously. Moreover, by forming a large number of heat transfer holes 31 in the vicinity of the pressure combustion chamber 3 of the heat transfer nozzle 4, damage to the heat transfer nozzle 4 due to the pressure of the high-temperature gas generated in the pressure combustion nitrogen 3 and the like can be prevented. It is also possible to prevent it.

Further, by appropriately changing the volume of the pressure combustion chamber 3, the inner diameter of the transfer nozzle, and the extension length, the loading amounts of the first and second transfer agents 7, 8 can be reduced. Can be adjusted to the most suitable for burning. In addition, at least one of the first and second transfer agents 7, 8 has a heat generation value of more than 350 J / g by ignition combustion, and the number of moles of gas generated by combustion is 0.5 mo. If the weight is 1/100 g or more, the flame from the igniter 6 can be instantaneously propagated in the axial direction of the housing 1, so that the gas generating agent 5 can be instantaneously discharged without using a squib. Can transition to overall combustion.

Next, the gas generator P2 shown in FIG. 3 will be described. In FIG. 3, the same reference numerals as those in FIGS. 1 and 2 denote the same members.

The gas generator P 2 shown in FIG. 3 makes it possible to control the expansion and deployment of the air bag, and the two igniters 6 burn the gas generating agent 5. As shown in FIG. 3, the sealed space S of the housing 1 is defined by left and right two combustion chambers 53, 54 by a partition plate 55 fitted into the inner periphery of the outer tubular member 9. In each of the combustion chambers 53, 54, a filler material 15 and a filler material 2 are inserted, respectively, as in FIG. It is loaded. Further, an igniter 6 and a pressure combustion chamber 3 are respectively mounted and formed on each lid member: L 0, 11 in the same manner as in FIG. 1, and a first transfer agent is provided in each pressure combustion chamber 3. 7 is loaded Have been. Further, a firing nozzle 4 is mounted on a holder 21 constituting the pressure transfer chamber 3 of each of the lid members 10, 11, and the transfer nozzle 4 is arranged inside each combustion chamber 53, 54. The housing 1 extends in the axial direction. In each of the transfer nozzles 4, a second transfer agent 8 is loaded. Further, a plurality of fire holes 31 are formed in each fire nozzle 4, and each fire hole 31 is closed by a rupture plate 32.

In this way, two igniters 6 are attached to the gas generator P2, and the flame generated by the ignition of each igniter 6 is propagated by the first and second transfer agents 7, 8, respectively. By doing so, it is possible to enhance the combustion of the gas generating agent 5.

In addition, by adjusting the energization and firing of each igniter 6, the expansion of the airbag can be controlled. Specifically, the two igniters 6 are energized and ignited with a small time difference in response to the collision of the vehicle, so that the airbag starts in the early stage of development, for example, a small amount of clean gas generated in the combustion chamber 53. Then, after a minute time difference, a large amount of clean gas generated in each of the combustion chambers 53 and 54 rapidly expands and deploys. At this time, the gas generating agent 5 in each of the combustion chambers 53, 54 and the first igniting agent 7 in each of the lid members 10, 11 in the same manner as the gas generator P1 in FIG. , The two transfer nozzles: The second transfer agent 7 and 8 in the unit immediately transfer to the overall combustion, and control the inflation and deployment of the airbag in an optimal time (millisecond). Becomes possible.

Finally, the gas generator P3 shown in FIG. 4 will be described. In FIG. 4, the same members as those in FIGS. 1 to 3 are denoted by the same reference numerals. The gas generator P3 in FIG. 4 is different from the gas generator P2 in FIG. 3 in that the partition plate 55 does not define two combustion chambers 53, 54 on the left and right sides. It was a firing room. As shown in FIG. 4, the firing nozzle 4 is It is disposed between the members 10 and 11 and is mounted on each holder 21 so as to enable continuous communication in the pressure combustion chamber 3 of each lid member 10 and 11.

In this gas generator P3, two igniters 6 are mounted, and the flame generated by the ignition of each igniter 6 is propagated by the first and second transfer agents 7, 8 to generate gas. It becomes possible to increase the combustion of the agent 5. Further, in the gas generator P3, the ignition of each igniter 6 with a small time difference can be controlled in the same manner as in FIG. At this time, the gas generating agent 5 in the filter support material 15 is the same as the gas generator P 1 in FIG. 1, and the first transfer agent 7 in each of the lid members 10 and 11 is With the second transfer agent 8 in one transfer nozzle 4, the entire combustion is instantaneously shifted to the entire combustion, and the expansion and deployment of the air bag can be controlled in an optimum time (millisecond). .

In the gas generators P.1 to P3, a gas generator of a nitrogen-containing organic compound can be employed in addition to the gas generator of the metal azide compound. As described above, in each of the gas generators P1 to P3, the combustion of the gas generating agent 5 can be instantaneously made overall, and the combustion of the gas generating agent 5 can be enhanced. Even if a gas generator of a nitrogen-containing organic compound, which has lower ignition performance than that of a gas generator, is used, ignition and combustion can be performed instantaneously and stably. In addition, as a gas generating agent, a compound having a nitrogen-containing organic compound such as a tetrazole compound, a triazole compound, an amide compound, or a guanidine compound as a combustion component can be used.

The gas generators P1 to P3 according to the embodiment of the present invention are not limited to those shown in FIGS. 1 to 4, and may take the following forms, for example.

(1) A configuration in which the pressure combustion chamber 3 is formed in the lid member 10 and the firing nozzle 4 can be communicated with the pressure combustion chamber 3 by the holder 21; The configuration is not limited to a configuration in which the combustion chamber 3 and the ignition nozzle 4 are separated from each other, and a configuration in which the pressure combustion chamber 3 is integrally formed on the opening side of the ignition nozzle 4 can be adopted.

(2) The housing 1 is not limited to the one composed of the outer cylinder member 9 and the two lid members 1Q and 11; an outer cylinder member having a bottom with an opening at one end and an opening of the outer cylinder member are provided. It can also be composed of one lid member that closes the side.

(3) In a gas generator having a plurality of ignition means 6, a configuration in which the pressure combustion chamber 3 and the transmission nozzle 4 are provided only at the shaft end where some of the ignition means are provided can be adopted. Industrial applicability ''

In the gas generator of the present invention, the first explosive agent is ignited and burned by the ignition means, and the second explosive agent is ignited and burned by the heat of combustion of the first explosive agent. By transmitting heat energy such as flame from the means in the axial direction of the housing, it is possible to instantaneously shift to the overall combustion of the gas generating agent. As a result, the entire combustion of the gas generating agent can be performed only by the first and second transfer agents, and there is no need to bury a squib in the ignition material as in a conventional gas generator. Simplification and reduction of manufacturing costs. In the gas generator, it is possible to enhance the ') ^ burning of the entire gas generating agent by the propagation of the flame and the like by the first and second transfer agents, and to inflate and deploy the airbag instantaneously. Become.

Claims

The scope of the claims

1, a long cylindrical housing whose both ends are closed,

An ignition means mounted on at least one shaft end of the housing; and a first transfer agent provided on at least one of the shaft ends of the housing having the ignition means and ignited and burned by the ignition means. ,

A second transfer agent extending in the axial direction within the housing and ignited and burned by combustion heat of the first transfer agent;

A gas generating agent that is loaded in the housing in the axial direction and that is burned by the heat of combustion of the second transfer agent;

A gas generator comprising:

2. A long cylindrical housing with both ends closed,

An ignition means mounted on at least one shaft end of the housing; a pressure combustion chamber provided on at least one of the shaft ends of the housing having the ignition means, and sealed from inside and outside of the housing;

A heat transfer nozzle communicating with the pressure combustion chamber and extending axially in the housing;

A plurality of transmission holes formed in the axial direction of the transmission nozzle, and a communication hole communicating the inside of the transmission nozzle with the inside of the housing.

A first transfer agent charged into the pressure combustion chamber and ignited and burned by the ignition means;

A second transfer agent charged axially in the transfer nozzle and ignited and burned by the heat of combustion of the first transfer agent;

The fuel is loaded in the housing in the axial direction and is ejected through each of the heat transfer holes of the heat transfer nozzle. A gas generator comprising: a gas generating agent;

3. The gas generator according to claim 2, wherein an inner diameter of the transfer nozzle is smaller than an inner diameter of the pressure combustion chamber.

4. The plurality of heat transfer holes are formed so as to reduce the pitch between holes near the pressure combustion chamber and to increase the pitch between holes as the distance from the pressure combustion chamber increases. The gas generator according to claim 2 or claim 3. ,

5. At least one of the first and second transfer agents must have a calorific value of 3500 J / g or more due to ignition and combustion, and a mole number of gas generated by combustion of 0.5mo1 / 100 g or more. The gas generator according to claim 1 or claim H, characterized by the following.