WO2001072560A1 - Gas generator - Google Patents

Abstract

A gas generator (P1) which comprises an ignition means (6) mounted on the cover member (8) of a housing (1), the ignition means (6) being used to ignite and burn a gas-generating agent (5) in a cylindrical member (3) from the axial end side of the housing (1). In the gas generator (P1), the cylindrical member (3) projects from the cover member (8) of the housing (1) to lie adjacent the inner periphery of the axial end (2A) of a filter member (2), defining an annular space (S1) between the cylindrical member (3) and the inner periphery of the axial end (2A) of the filter member (2). And the gas generating agent (5) is filled around the inner periphery of the filter member (2) and in the cylindrical member (3).

Description

 Specification

Gas generator technical field

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

 A gas generator that instantly expands and deploys the airbag in order to protect the occupant from the impacts caused by the collision of the car is built into the airbag module installed inside the instrument panel. This gas generator instantaneously generates a large amount of high-temperature gas based on a collision detection signal from a collision sensor in the event of a collision.

 An example of a gas generator for inflating and deploying an airbag is shown in FIG. The gas generator shown in Fig. 1 '3 is mainly for inflating and deploying the airbag for the passenger seat.The outer cylinders 102 with both ends open and the outer cylinders 102 are closed at the opening sides. An elongated housing 101 composed of a lid member 103 and a cover member 104 is provided. Inside the housing 101, a cylindrical filter material 105 is mounted. A gas generating agent 106 that generates a high-temperature gas by combustion is loaded in the circumference of the finoleta material 105. Further, the lid member 103 is provided with an ignition means 109 composed of an ignition device 107 and a transfer agent 108.

In this gas generator, the ignition device 107 is energized and ignited by the collision detection signal from the collision sensor, and the transfer agent 108 is ignited. The flame of the transfer agent 108 is jetted into the inner periphery of the filter material 105 and ignites and burns the gas generating agent 106 to generate a large amount of high-temperature gas. Housing 1 0 1 The high-temperature gas generated inside flows into the filter material 105, where it is collected and cooled, and then released into the airbag from each gas discharge hole 102a of the outer cylinder 102. . The airbag is rapidly inflated and deployed by a large amount of clean gas discharged from each gas discharge hole 102a.

 In the conventional gas generator, the ignition means 109 is attached to the lid member 103 serving as the shaft end of the housing 101, so that the gas generating agent 106 is sequentially supplied from the shaft end side of the housing 101. It adopts a structure that ignites and burns. Further, the gas generating agent 106 is loaded in a state of contacting the inner periphery of the filter material 105. Accordingly, when the gas generating agent 106 is ignited and burned by the igniting means 1.09, the filter material 105 acts as a heat absorber and tends to reduce the ignition performance of the gas generating agent 106. Become. That is, some of the thermal energy of the flame ejected from the ignition means 109 flows into the shaft end of the finoleta material 105 and is used for heating the filter material 105. In other words, the ignition means 1 The heat energy from 09 is not used efficiently, and the ignition of the gas generating agent 106 tends to be delayed.

 In recent years, gas generating agents have changed from those containing harmful substances of metal azide compounds to those containing nitrogen-containing organic compounds. Gas generators of nitrogen-containing organic compounds generally have poorer ignitability than those of metal azide compounds. Therefore, in a gas generator using a nitrogen-containing organic compound-based gas generating agent, the thermal energy of the flame ejected from the ignition means 109 is absorbed by the filter material 105 so that the gas generating agent 1 The ignition delay of 06 becomes significant. This may mean that the airbag may not be able to inflate and deploy in the optimal time (milliseconds) with the optimal clean gas volume and pressure rise.

The present invention is intended to improve the ignition performance of the gas generating agent by the thermal energy of the flame from the igniting means, so that the airbag can be inflated and deployed optimally, and the slag collection and cooling effect can be achieved by the effective use of the finoleta material. Also enhance It is to provide a gas generator which can be used. Disclosure of the invention

 A gas generator according to the present invention (Claim 1) mainly expands and deploys an airbag for a passenger seat, and is mounted in the housing having a long cylindrical shape having both ends closed. A cylindrical filter material; a gas generating chamber formed at at least one shaft end of the housing, the gas generating chamber being charged with a gas generating agent for generating a high-temperature gas by combustion; and a housing shaft including the gas generating chamber. An ignition means mounted on the end and igniting and burning the gas generating agent from the shaft end side, wherein a gas generating agent is housed inside the gas generating chamber, and An ignition chamber for regulating the outflow of gas in the circumferential direction is adjacent to the ignition means.

 In recent years, the size of the gas generator has been reduced, the distance between the ignition means and the housing has been reduced, and the heat energy from the ignition means has escaped to the housing and the like, and the amount of heat loss has increased. However, by providing a structure in which the ignition chamber that regulates the outflow of gas into the gas generation chamber is adjacent to the ignition means as in the present invention, the heat energy of the flame from the ignition means can be used for the filter material and the housing. Without escaping, you can stay inside the ignition room. For this reason, the heat energy from the ignition means can be efficiently stored in the gas generation chamber and used for combustion of the gas generating agent.

Therefore, in the initial stage from the start of the combustion of the gas generating agent, all the heat energy from the ignition means is concentrated on a small amount of the gas generating agent loaded in the ignition chamber, so that the ignition combustion can be performed instantaneously and stably. The flame generated by the combustion of the gas generating agent in the ignition chamber and the thermal energy of the high-temperature gas are ejected from the opening of the ignition chamber into the inner periphery of the filter material, and transfer to the overall combustion of the gas generating agent. Also, The high-temperature gas generated in the housing flows into the filter material as the gas generating agent burns, and also flows from the shaft end of the filter material through the annular space. Slag collection and cooling can be performed effectively.

 Further, since the combustion of the gas generating agent is started with respect to the gas generating agent in the cylindrical material, it is possible to eliminate the concentration of high-temperature gas or the like near the ignition means of the filter material in the initial stage of combustion. Thus, it is not necessary to strengthen the structure near the ignition means in order to prevent heat loss of the filter material and the like.

 In the gas generator according to the present invention (claim 2), a cylindrical member projecting into the gas generation chamber is provided at at least one shaft end of the housing where the ignition means is provided. The chamber is made of the cylindrical material.

 By providing the cylindrical member at at least one of the shaft ends provided with the ignition means, the ignition chamber can be easily formed. As a result, the structure of the gas generator can be simplified.

 In the gas generator according to the present invention, it is sufficient that the cylindrical member protrudes into the gas generation chamber, and the internal structure of the housing is not particularly limited, and either a one-chamber structure or a two-chamber structure may be employed. it can.

 Further, the gas generator of the present invention (claim 3) has an annular space formed between the inner periphery of the housing and the cylindrical member.

By forming an annular space between the inner periphery of the housing and the cylindrical member, dissipation of heat from the ignition chamber can be more effectively prevented. In addition, by simultaneously activating each ignition means with a time lag, it is possible to adjust the gas generation amount and the pressure rise, and to control the deployment form of the airbag. Further, the gas generator of the present invention (Claim 4) is characterized in that the filter material is Is disposed across both shaft ends of the housing, and comprises: an inner periphery of a shaft end of the finoleta material; and an annular space formed between the cylindrical material.

 By disposing the filter material between the two axial ends of the housing to provide an annular space, heat dissipation from the ignition chamber can be more effectively prevented. Furthermore, the high-temperature gas and the like generated in the housing flows into the filter material as the gas generating agent burns, and also flows from the axial end of the filter material through the 漯 -shaped space. The slag can be collected and cooled by effectively utilizing the slag.

 In the gas generator according to the present invention (claim 5), the amount of protrusion of the cylindrical material is appropriately selected from the range of 3.0 mm to the filter material length X 0.5. .

 By selecting the amount of protrusion of the inner cylinder, the heat energy that is trapped in the ignition chamber from the start of combustion of the gas generant, that is, the heat energy that escapes into the filter material from the opening of the ignition chamber, is adjusted. it can. By adjusting the thermal energy, the ignitability of the gas generating agent, the amount of gas released into the airbag, and the pressure rise of the gas can be adjusted.

 Further, the gas generator (Claims 6 and 7) of the present invention is characterized in that a gas ejection hole communicating with the inside of the cylindrical member and the annular space is formed in the cylindrical member. is there.

 The heat energy generated in the ignition chamber formed by the cylindrical material is released not only from the opening of the ignition chamber but also from the gas injection hole through the annular space into the shaft end of the filter material. This makes it possible to fine-tune the heat energy that is trapped in the ignition chamber.

The high-temperature gas, flame, and the like generated in the ignition chamber flow into the shaft end of the filter material from the gas outlet through the annular space. This allows for high Hot gas can flow into the filter material from the shaft end of the filter material, and slag collection and cooling can be performed by effectively using the entire filter material.

 Furthermore, by appropriately selecting not only the protrusion amount of the cylindrical member but also the inner diameter dimension, the heat energy stored in the ignition chamber can be adjusted.

 In the gas generator according to the present invention (claims S and Ninth claims), the gas ejection holes are formed in the circumferential direction and the axial direction of the cylindrical member. The high-temperature gas generated in the ignition chamber formed by the cylindrical material is distributed in the axial direction and the circumferential direction of the filter material by each gas outlet, and passes through the annular space from the axial end of the filter material into the filter material. Is flowed in. This makes it easier to fine-tune the thermal energy stored in the ignition chamber.

 In the gas generator of the present invention (claims 10 and 11), the gas generating agent is also loaded in the annular space.

 The capacity of the gas generating agent can be secured by effectively utilizing the volume in the housing. In addition, heat energy is ejected from the opening of the ignition chamber and further ejected from each gas injection hole, so that the gas generating agent in the annular space can be ignited and burned. Since the high-temperature gas generated in the annular space flows into the filter material from the shaft end of the filter material, slag collection and cooling can be performed by effectively using the entire filter material.

 Further, the gas generator of the present invention (Claim 12) is characterized in that the ignition means is provided on a lid member for closing at least one shaft end provided with the ignition means of the housing. A space for housing is provided, and the ignition chamber is constituted by the space.

 By providing a space in the lid member, the ignition chamber can be easily configured, and the structure of the gas generator can be simplified.

Further, the gas generator of the present invention (Claim 13) is characterized in that the filter Material is disposed between both shaft ends of the housing, gas amount regulating means for regulating the inflow of the high-temperature gas flowing into the filter material is provided, and the ignition chamber is provided with the gas amount regulating means. It is composed of

 The gas amount regulating means escapes from the shaft end of the filter material to the filter material 、, and minimizes the heat energy of the flame from the ignition means, thereby confining the ignition material inside the inner periphery of the shaft end of the filter material. be able to. Therefore, from the start of the combustion of the gas generating agent to the initial stage, the heat energy from the igniting means is concentrated on the gas generating agent in the shaft end of the filter material, and instantaneous and stable ignition combustion can be performed. The high-temperature gas and flame generated in the ignition chamber at the shaft end of the filter material are ejected to the other shaft end of the filter material, and are transferred to the overall combustion of the gas generating agent. In addition, the gas amount regulating means allows a portion of the high-temperature gas generated in the ignition chamber at the shaft end of the filter material to flow into the filter material from the shaft end of the filter material, so that the entire filter material is effective. It can be used to collect and cool slag.

 In addition, the high-temperature gas generated in the early stage of combustion can be restricted from being concentrated near the ignition means by the gas amount control means. This eliminates the need to strengthen the structure near the ignition means in order to prevent heat loss of the filter material and the like.

Further, in the gas generator according to the present invention (claim 14), the gas amount control means has a gas passage hole mounted on the filter material and for allowing the high-temperature gas to flow into the filter material. The flow rate of the high-temperature gas is regulated by the number of the gas passage holes and the opening area of the gas passage holes. Further, in the gas generator according to the present invention (claim 15), the gas amount control means is constituted by a goldfish or a metal wire forming a filter layer of the filter material, Alternatively, the inflow amount of the high-temperature gas is determined by the porosity formed of the metal wire, or the wire mesh, or the number of filter layers of the metal wire. It regulates.

 In any case, the inflow of high-temperature gas can be easily regulated by changing the structure of the existing members used for the gas generator.

 Further, in the gas generator according to the present invention (claim 16), the gas amount regulating means is formed such that a gas emission amount is regulated toward the ignition means side. It is.

 Since the gas amount regulating means is formed so as to regulate the amount of gas released toward the ignition means side, the heat energy from the igniter can be more effectively used in the ignition chamber (in the filter material). (Within the circumference). Further, in the gas generator of the present invention (claim 17), the gas generating agent is a nitrogen-containing organic compound-based gas generating agent.

'' The gas generating agent of a nitrogen-containing compound is inferior in ignition performance to the gas generating agent of a metal azide compound, but by applying to the gas generator of the present invention, there is no ignition delay. It is possible to stably ignite and burn instantaneously. In this way, by improving the ignition performance of the gas generating agent containing nitrogen compounds, it is possible to provide an environmentally friendly gas generator without generating harmful substances unlike the gas generating agent of metal azide compounds Becomes BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional view showing a first embodiment of a gas generator according to the present invention. FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is an enlarged sectional view of a main part of FIG. FIG. 4 is a view showing a knitted wire mesh and a crimp-woven metal wire for forming a filter material. FIG. 5 is an enlarged sectional view of a main part showing a second embodiment of the gas generator of the present invention. FIG. 6 is an enlarged sectional view of a main part of a gas generator according to a third embodiment of the present invention. FIG. 7 is a perspective view showing a configuration of a filter supporting member. FIG. 8 is a modification of FIG. It is a principal part expanded sectional view which shows the gas generator which is. FIG. 9 is a sectional view showing a modification of the first to third embodiments of the gas generator of the present invention. FIG. 10 is a sectional view showing a fifth embodiment of the gas generator of the present invention. FIG. 11 is a sectional view showing a sixth embodiment of the gas generator of the present invention. FIG. 12 is a graph showing the results of a 60-liter tank test on the gas generator of the first invention, showing the relationship between tank pressure (kPa) / time (millisecond). FIG. 13 is a cross-sectional view showing a conventional gas generator. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the gas generator according to the present invention will be described, but the gas generator according to the present invention is not limited to the embodiments described below.

 A first embodiment of a gas generator according to the present invention will be described with reference to FIG. 1 to FIG.

 The gas generator P 1 shown in FIGS. 1 and 2 mainly inflates and deploys an airbag for a passenger seat, and has a long cylindrical housing 1, a cylindrical finoleta material 2, and a cylindrical material. 3 and ignition chamber 2 formed on the inner circumference of cylindrical material 3

3, an annular space S 1, a gas generating agent 5, and ignition means 6. The housing 1 is composed of an outer cylindrical member 7 having both ends opened, and two lid members 8 and 9 for closing both ends of the outer cylindrical member 7. The housing 1 is formed by inserting the respective lid members 8 and 9 into the respective openings of the outer cylinder 7 and bending the respective openings of the outer cylinder 7 radially inward to thereby seal the gas sealed inside. This is the structure that forms the generation chamber S. Thus, the housing 1 is formed in an elongated cylindrical shape with both ends closed, with the respective lid members 8 and 9 as respective shaft ends.

The outer cylinder 7 has a plurality of gas discharge holes 7 a communicating the gas generating chamber S and the airbag. As shown in FIG. 2, each gas discharge hole 7a The outer cylindrical member 7 is formed at predetermined intervals in the axial direction and the circumferential direction. Further, each gas discharge hole 7a is closed by a burst plate 10 attached to the inner periphery of the outer cylindrical member 7. The burst plate 10 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. In addition, a storage space S3 that is open to the sealed space S and extends toward the shaft end of the housing 1 is formed at one end of the lid member 8.

 The finhole material 2 is mounted in the sealed space S of the housing 1, and is arranged between the lid members 8 and 9 in the axial direction of the housing 1. As the filter material 2, as shown in FIG. 4 (c), a plurality of filter layers 7 a are formed by a knitted wire mesh shown in FIG. 4 (a) or a crimp-woven metal wire shown in FIG. 4 (b). Into a cylindrical shape. Further, a cylindrical inner cylinder 11 is inserted into the inner periphery of the filter 2. Then, the filter member 2 is attached to the outer tube member 7 by attaching the shaft end portions 2A, 2B to the outer periphery of the projections 8a, 9a of the lid members 8, 9 together with the inner tube member 11. Between them forms an annular gas passage space S2. The inner cylindrical member 11 has a plurality of gas passage holes 11a communicating with the filter member 2 內. As shown in FIG. 2, the gas passage holes 11 a are formed at predetermined intervals in the axial direction and the circumferential direction of the inner cylindrical member 11. The cylindrical member 11 is manufactured by forming a porous steel plate (punching plate) or an eta spand metal into a cylindrical shape.

 As shown in FIG. 1, the ignition chamber 23 is formed on the inner periphery of the cylindrical member 3, is adjacent to the ignition means 6 mounted on the shaft end, and is loaded with the gas generating agent 5.

As shown in FIG. 3, the cylindrical member 3 forming the ignition chamber 23 is provided on a lid member 8 serving as a shaft end of the housing 1. The cylindrical material 3 is formed in a cup shape having one end chained, and the cup bottom 3 a side is set in the storage space S 3. It is attached to the lid member 8 by screwing it on. Further, the cylindrical member 3 protrudes into the inner periphery of the shaft end 2A of the filter member 2 adjacent to the lid member 8. Projecting the內筒member 3 is protruded from the protrusion 8 a of the lid member S only in the inner periphery of the shaft end portion ² A of the filter material 2, 3. O mm to the axial direction of the filter material 2 and the protrusion amount L It is preferable to select an appropriate value within the range of the overall length (filter material length) X 0.5. The inner and outer diameters of the cylindrical member 3 are also sized to form an annular space S1 with the inner periphery of the shaft end 2A of the filter member 2. Thus, by appropriately selecting the protrusion amount L of the cylindrical member 3 and the dimensions of the inner and outer diameters, the volume of the ignition chamber 23 formed by the inner cylindrical member 3 can be adjusted. For this reason, the heat energy of the flame from the ignition means 6, which is confined in the ignition chamber 23, can be adjusted. Thus, the cylindrical member 3 protrudes into the inner periphery of the shaft end .2A of the filter member 2 and communicates with the inner cylindrical member 11 which is the inner periphery of the filter member 2. The cup bottom 3 a of the cylindrical member 3 defines the inside of the storage space S 3 of the lid member 8 as a transfer chamber 14. Further, in the cup bottom 3 a of the cylindrical member 3, a fire hole 3 b communicating with the inside of the cylindrical member 3 and the inside of the transfer chamber 14 is formed.

 As described above, the protrusion amount L of the cylindrical member 3 is preferably selected as appropriate from the range of 3.0 mm to the total length X 0.5 of the axial direction of the filter member 2, but is not limited thereto. is not. That is, the amount of protrusion L of the cylindrical member 3 is determined by the amount of the thermal energy of the flame from the ignition means 6 without escaping into the shaft end 2 A of the filter member 2 and within the ignition chamber 23 within the cylindrical member 3. Anything that can make you feel sick may be used.

The annular space S 1 is formed between the inner periphery of the shaft end 2 A of the filter material 2 and the cylindrical material 3. The volume of the annular space S 1 is adjusted by the inner and outer diameters of the cylindrical member 3. The gas generating agent 5 generates high-temperature gas by combustion. This gas generating agent 5 is continuously formed in the inner cylindrical member 11, the cylindrical member 3, and the annular space S 1, which are the inner periphery of the finoleta material 2. It has been loaded. The gas generating agent 5 is prevented from powdery swelling due to vibration by the cushion material 14 attached between the gas generating agent 5 and the cover member 9. As the cushion material 14, an elastic material such as silicone rubber or silicone foam material is used. The igniting means 6 is mounted on a member 8 which is a shaft end of the housing 1. The ignition means 6 includes a transfer agent 12 and an igniter 13 for igniting the transfer agent 12. The transfer agent 12 is covered with a metal foil such as aluminum and stored in the transfer chamber 14 of the lid member 8. The igniter 13 is mounted in the lid member 8 from the shaft end of the housing 1 and faces the transfer agent 12. Thus, the ignition means 6 energizes the ignition device 13 according to the collision detection signal from the collision sensor and ignites the transfer agent 1 2, thereby causing the gas generating agent 5 in the cylindrical member 3 to move the housing 1 Ignition combustion from the shaft end side of In addition, as the ignition means 6, an ignition device 12 and an explosive agent 13 integrally formed can be used.

 Next, the operation of the gas generator P1 will be described.

 When the collision sensor detects the collision of the vehicle, the gas generator P 1 energizes and ignites the igniter 13 of the ignition means 6 and ignites the transfer agent 12. The flame of the transfer agent 1 2 is ejected from the sintering hole 3 b into the ignition chamber 2.3 in the cylindrical member 3, and the gas generating agent 5 is transferred by the heat energy of the flame from the ignition means 6 to the shaft of the housing 1. High-temperature gas is generated by igniting and burning from the end side. The combustion in the ignition chamber 23 is performed by causing the heat energy to escape into the ignition chamber 23 without escaping into the shaft end 2A of the filter material 2. Therefore, the gas generating agent 5 charged in the ignition chamber 23 is effectively and instantaneously and stably ignited and burned by effectively utilizing all the heat energy from the ignition means 6.

The high-temperature gas and the like generated in the ignition chamber 23 are jetted into the inner cylinder 11 which is the inner periphery of the filter material 2, and transferred to the overall combustion of the gas generating agent 5, thereby producing a large amount of high-temperature gas. Generate. In addition, high-temperature gas from the ignition chamber 23 And the like generate high-temperature gas by flowing into the annular space S1 and igniting and burning the gas generating agent 5.

 The high-temperature gas generated in the housing 1 flows into the filter material 2 as the gas generating agent 5 burns. The high-temperature gas also flows from the annular space S1 into the shaft end 2A of the filter material 2 through the gas passage holes 11a of the inner cylindrical material 11. As a result, the high-temperature gas flows into the filter material 2 from the entire range of the filter material 2, and then flows through the slag collection and cooling to the gas passage space S 2.

 As the combustion of the gas generating agent 5 progresses and the inside of the housing 1 rises to a predetermined pressure, the burst plate 10 ruptures, and clean gas uniformized in the gas passage space S2 is discharged into each gas discharge hole. Released into the airbag through 7a. Thus, the airbag is rapidly inflated and deployed by the clean gas discharged from each gas discharge hole 7a.

 As described above, according to the gas generator P1, the heat energy of the flame from the ignition means 6 can be trapped in the ignition chamber 23 without escaping into the shaft end 2A of the filter material 2. it can. Therefore, in the early stage from the start of the combustion of the gas generating agent 5, all the heat energy from the ignition means 6 is concentrated in the small amount of the gas generating agent 5 loaded in the ignition chamber 23, and instantaneously and stably. Can be ignited and burned. As a result, the gas generator P 1 eliminates the ignition delay of the gas generating agent 5: enhances the ignition performance of the gas generating agent 5, and operates the airbag in the optimum time (millisecond) and the optimum amount of clean gas. In addition, it is possible to expand and deploy with an increase in pressure.

In addition, since the high-temperature gas generated in the housing 1 flows from the entire area of the filter material 2, slag collection and cooling can be performed by effectively using the entire filter material 2. As a result, it is possible to increase the efficiency of slag collection and cooling of hot gas. Furthermore, since the combustion of the gas generating agent 5 is performed on the gas generating agent 5 in the inner cylinder 3, the concentration of high-temperature gas or the like on the shaft end 2A of the filter material 2 in the early stage of combustion is reduced. Can be eliminated. Thus, it is not necessary to strengthen the structure near the ignition means 6 in order to prevent heat loss of the filter material 2 and the like. In the gas generator P1, as shown in FIG. 3, by forming gas ejection holes 3c in the axial direction and the circumferential direction of the cylindrical member 3, the ignition chamber 23 of the cylindrical member 3 材 is formed. Fine adjustment of the heat energy to be confined can be made possible. After the thermal energy of the flame from the ignition means 6 is injected into the ignition chamber 23, it is released into the annular space S1 through the gas injection holes 3c. As a result, the ignition and combustion of the gas generating agent 5 in the cylindrical member 3 can be finely adjusted to an optimum one, and the air bag expands in an optimum time (millisecond) with an optimum amount of the clean gas and a rise in the pressure. It can be expanded. In particular, when the protrusion amount L of the cylindrical member 3 is increased, the heat energy by the ignition means 6 tends to be excessively trapped in the ignition chamber 23 in the cylindrical member 3, so that each gas ejection hole 3c is more minute. Adjustment can be effective. In addition, the high-temperature gas or the like generated in the ignition chamber 23 is ejected into the annular space S1, so that the gas generating agent 5 in the annular space S1 can be ignited and burned. This means that the high-temperature gas generated in the annular space S 1 flows into the shaft end 2 A of the filter material 2 through each gas passage hole 11 a of the inner cylinder 11. The slag can be collected and cooled by effectively using the entire filter material 2.

The gas outlets 3 c are preferably formed at predetermined intervals in the axial direction and the circumferential direction of the cylindrical member 3, whereby the high-temperature gas and the like in the ignition chamber 23 are transferred to the axis of the annular space S 1. It can be distributed evenly in the direction and the circumferential direction. As a result, the ignition combustion of the gas generating agent 5 in the annular space S 1 is made uniform, and the high-temperature gas flows uniformly into the filter material 2 from the entire circumference of the shaft end 2 A of the filter material 2. Becomes possible. In the gas generator P1, a configuration in which the gas generating agent 5 is not loaded in the annular space S1 can also be adopted. The high-temperature gas generated in the cylindrical member 3 is guided into the annular space S 1 from the opening force of the cylindrical member 3, or from each gas ejection hole 3 c, and is filtered from the shaft end 2 A of the filter member 2. It will flow into 2. This makes it possible to effectively use the entire filter material 2 to collect and cool the slag.

 Further, in the gas generator P1, a structure in which the filter material 2 is directly mounted on the outer periphery of the projections 8a and 9a of the lid members 8 and 9 without providing the inner cylindrical member 11 can also be adopted.

 Next, a second embodiment of the gas generator according to the present invention will be described with reference to FIG. '

 The gas generator P2 shown in FIG. 5 is obtained by forming an ignition chamber 23 in a lid member 8 instead of the cylindrical member 3 and the annular space S1 in the gas generator P1 of FIG. .

 In FIG. 5, the same reference numerals as those in FIGS. 1 to 4 denote the same members, and a description thereof will be omitted.

The gas generator P2 shown in FIG. 5 includes a partition member 24 that defines an ignition chamber 23 and a transfer chamber 14 in the storage space S3. The partition member 24 is screwed into the storage space S3 from the shaft end 2 軸 side of the filter material 2. In addition, the partition member 24 is provided with a squib 24 a communicating the chambers 23, 14. The ignition chamber 23 communicates with the inner cylindrical member 11 located at the shaft end 2A of the filter member 2, and its depth H is appropriately selected. The inner diameter of the ignition chamber 23 is also sized to communicate with the inner cylinder 11. In this way, by appropriately selecting the depth H of the ignition chamber 23 and the dimensions of the inner diameter, the heat energy of the flame from the ignition means 6 that is confined within the ignition chamber 23 can be adjusted. Further, the gas generating agent 5 is provided in the inner cylindrical material 11 which is the inner circumference of the filter material 2, And in the ignition chamber 23 continuously. It should be noted that the igniting means 6 may be one in which the igniter 12 and the transfer agent 13 are integrated with each other without providing the partition member 24.

 Next, the operation of the gas generator P2 will be described.

 When the collision sensor detects the collision of the car, the gas generator P 2 energizes the ignition device 13 of the ignition means 6 and ignites the transfer agent 12. The flame of the transfer agent 1 2 is ejected into the igniter 23 through the igniter hole 24 a, and the gas generating agent 5 is ignited and burned from the shaft end side of the housing 1 by the heat energy of the flame from the ignition means 6. This generates hot gas. The combustion in the ignition chamber 23 is performed by allowing the heat energy to escape to the ignition chamber 23 內 without escaping into the shaft end 2A of the filter material 2. Therefore, the gas generating agent 5 loaded in the ignition chamber 23 is effectively and instantaneously and stably ignited and burned by effectively utilizing all the heat energy from the ignition means 6. * High-temperature gas, etc., generated in the ignition chamber 23 內 is ejected into the inner cylinder 11 which is the inner periphery of the filter material 2, and is transferred to the overall combustion of the gas generating agent 5, resulting in a large amount of high temperature Generate gas.

 The high-temperature gas generated in the housing 1 flows into the filter material 2 sequentially from the shaft end 2A of the filter material 2 toward the shaft end 2B along with the combustion of the gas generating agent 5, and After being collected and cooled, the slag is discharged into the gas passage space S 2.

 As the combustion of the gas generating agent 5 progresses, as in the case of FIG. 1, the uniform clean gas in the gas passage space S2 is discharged into the airbag through each gas discharge hole 7a. Thus, the airbag is rapidly inflated and deployed by the clean gas discharged from each gas discharge hole 7a.

As described above, according to the gas generator P2, the thermal energy of the flame from the ignition means 6 does not escape into the shaft end 2A of the filter material 2, and the ignition chamber 2 3 can be confined. Therefore, in the initial stage from the start of the combustion of the gas generating agent 5, all the heat energy from the ignition means 6 can be concentrated on the gas generating agent 5 loaded in the ignition chamber 23 to instantaneously and stably ignite. Can be. As a result, the gas generator P2 eliminates the ignition delay of the gas generating agent 5, enhances the ignition performance of the gas generating agent 5, and allows the airbag to perform optimal gas cleaning in an optimal time (millisecond). It is possible to expand and deploy with the amount and pressure rise.

 In the gas generator P 2, high-temperature gas and the like generated in the ignition chamber 23 can flow into the filter material 2 か ら sequentially from the shaft end 2 A of the filter material 2. It is possible to collect and cool slag by effectively using the whole. As a result, it becomes possible to increase the efficiency of collecting and cooling the slag of the high-temperature gas. At this time, by increasing the opening area of the gas passage hole 11a from the shaft end 2A of the filter material 2 toward the center, the finoleta material 2 can be used uniformly.

 Furthermore, since the combustion of the gas generating agent 5 is started with respect to the gas generating agent 5 loaded in the ignition chamber 23, in the initial stage of combustion, high-temperature gas or the like is applied to the shaft end 2A of the filter material 2 at the beginning. Concentration can be eliminated. Thus, it is not necessary to strengthen the structure in the vicinity of the ignition means 6 in order to prevent heat loss of the filter material 2 and the like.

 Next, a third embodiment of the gas generator according to the present invention will be described with reference to FIG. 6 to FIG.

Gas ϋ production unit P 3 shown in FIG. 6 is Mel in that instead of the circular cylinder member 3 and the annular space S 1 in the gas generator [rho 1 of FIG. 1, comprises a gas amount regulating means 3 3 _Q

6 to 8, the same reference numerals as those in FIGS. 1 to 4 denote the same members, and a description thereof will be omitted. In the gas generator P 3 shown in FIG. 6, the gas amount regulating means 33 is constituted by the gas passage holes 11 a of the inner cylindrical member 11, so that the gas emission amount becomes smaller near the ignition means 6. By restricting the heat, the heat energy near the ignition means 6 is easily stored, and the same function as the ignition chamber 23 described above is performed.內 As shown in Fig. 7, by adjusting the number of gas passage holes 11a and the opening area of each shaft end 11A and 11B, the cylindrical material 11 This structure restricts the amount of hot gas flowing into the filter material 2 from the shaft ends 2A and 2B. The number of gas passage holes 11a formed and the opening area are determined by the thermal energy of the flame from the ignition means 6 at the shaft end 11A of the cylindrical member 11 located at the shaft end 2A of the filter material 2. Is appropriately selected in order to confine it. In other words, the number of formed gas passage holes 11a is reduced and the opening area is selected to be smaller toward the ignition means 6 so that the gas release amount is regulated. As a result, the heat energy from the ignition means 6 is easily stored, and the gas generating agent 5 charged in the ignition chamber 23 內 in the inner cylinder 11 can be efficiently burned. The inside of the inner cylindrical member 11 is separated from the transfer chamber 14 by a partition member 34 screwed into the storage space S3 of the lid member 8. The partition member 34 has a fire hole 34 a communicating with the inside of the shaft end 11 A of the inner cylinder 11 and the inside of the combustion chamber 14.

 The reason why the gas passage hole 11a of the inner cylinder 11 is reduced at the shaft ends 11A and 11B of the cylinder 11 so as to be symmetrical is that the gas generator P3 is This is because the inner cylindrical member 11 can be inserted into the housing 1 from any shaft end when assembling. This prevents erroneous mounting of the inner cylinder 11.

 Next, the operation of the gas generator P3 will be described.

When the collision sensor detects the collision of the vehicle, the gas generator P 3 energizes and ignites the igniter 13 of the ignition means 6 to ignite the transfer agent 12. The flame of the transfer agent 1 2 flows from the ignition hole 3 4a to the shaft end 1 1 High-temperature gas is generated by igniting and burning the gas generating agent 5 from the shaft end side of the housing 1 by the thermal energy from the ignition means 6, which is jetted into the inside 3.

 '' Combustion in the ignition chamber 23 in the inner cylinder 1 1 1 is performed by reducing the amount of heat energy that escapes from the shaft end 2 A of the filter 2 into the filter 2 due to the number of formed gas passage holes 1 a. At a minimum, this is performed by confining the inner cylindrical member 11 within the shaft end 11A. Therefore, the gas generating agent 5 loaded in the ignition chamber 23 on the shaft end 11 A side of the inner cylindrical member 11 1 instantaneously utilizes the thermal energy of the flame from the ignition means 6 effectively. Stable ignition combustion. '

 The high-temperature gas generated in the housing 1 flows into the filter material 2 內 from each gas passage hole 11a of the inner cylinder 11 with the combustion of the gas generating agent 5. The high-temperature gas also flows into the shaft end 2A of the filter material 2 from each gas passage hole 11a of the shaft end 11A of the inner cylindrical member 11. As a result, the high-temperature gas flows into the finoleta material 2 from the entire range of the filter material 2, and then flows out into the gas passage space S2 through slag collection and cooling.

 As the combustion of the gas generating agent 5 progresses, as in the case of FIG. 1, a uniform clean gas in the gas passage space S2 is discharged from each gas discharge hole 7a into the airbag. Thus, the airbag is rapidly inflated and deployed by a large amount of clean gas discharged from each gas discharge hole 7a.

Thus, according to the gas generator P3, the heat energy escaping into the shaft end 2A of the filter material 2 is minimized by the number of gas passage holes 11a formed in the inner cylinder 11 and the opening area. As a limit, the inner cylinder 11 can be confined in the ignition chamber 23 on the shaft end 11 A side. Therefore, in the initial stage from the start of combustion of the gas generating agent 5, the heat energy from the ignition means 6 is transferred to the gas generating agent 5 loaded in the ignition chamber 23 on the shaft end 11A side of the inner cylinder 11. It is possible to stably ignite and burn in a concentrated manner. As a result, the gas generator P 3 The ignition performance of the gas generating agent 5 is improved by eliminating the ignition delay of the generating agent 5, and the airbag can be inflated and deployed in the optimum time (millisecond) with the optimum amount of clean gas and the rise in pressure. Become.

 In addition, since the high-temperature gas generated in the housing 1 flows into the filter material 2 from the entire area of the filter material 2, slag collection and cooling can be performed by effectively using the entire filter material 2. As a result, it is possible to increase the efficiency of collecting and cooling the high-temperature gas slag.

 Further, the high-temperature gas generated in the initial stage of combustion can be restricted from being concentrated on the shaft end 2A of the filter material 2 by the inner cylindrical member 3. Thus, it is not necessary to strengthen the structure near the ignition means 6 in order to prevent heat loss of the filter material 2 and the like.

 In addition, although the gas generator P3 has been described as being constituted by the inner cylindrical member 11 as the gas amount regulating means 33, the structure shown in FIG. 8 can also be employed. The gas generator P3 shown in FIG. 8 is configured such that the gas amount regulating means 33 is replaced with a cylindrical member 11 and a cylinder regulating member 36 is used. The ignition chamber 23 in the present embodiment is formed by the cylindrical regulating member 36. The cylindrical restricting member 36 is mounted on the inner periphery of the shaft end 2 A of the filter member 2. The cylindrical regulating member 36 has a gas regulating hole 36 a communicating with the shaft end 2 A of the filter member 2. By adjusting the number of gas regulating holes 36a and the opening area, the cylinder restricting material 36 minimizes the amount of heat / regulation that escapes to the shaft end 2A 內 of the filter material 2. It is to be kept in the ignition chamber 23 formed by the regulating material 36. . The number of gas regulating holes 36a and the opening area are appropriately selected so that the thermal energy of the flame from the ignition means 6 is stored in the ignition chamber 23 formed by the cylindrical regulating member 36.

According to this gas generator P 3, the heat energy from the ignition means 6 can be trapped in the ignition chamber 23 formed by the cylindrical regulating member 36. Therefore, in the same manner as in FIG. 4, it is possible to eliminate the ignition delay of the gas generating agent 5 and to enhance the ignition performance of the gas generating agent 5. As a result, the airbag can be optimally inflated and deployed.

 The high-temperature gas generated in the housing 1 also flows into the shaft end 2 A of the filter material 2 from each gas control hole 36 a of the cylindrical control material 36, so that the entire filter material 2 is removed. Slag collection and cooling can be performed effectively.

 Further, for the same reason as the cylindrical member 3, it is not necessary to strengthen the structure near the ignition means 6 in order to prevent heat loss of the filter member 2 and the like.

 Further, in the gas generator P3, as the gas amount regulating means 33, a knitted wire mesh forming the filter layer 7a of the filter material 2 or a crimp-woven metal wire can be used (see FIG. 4). For the shaft end 2A of the filter material 2, adjust the porosity of the knitted metal mesh or crimp woven metal wire, and adjust the number of filter layers 7a formed of knitted metal or crimp woven metal wire. Regulates the flow of hot gas. Here, the porosity refers to a ratio of voids formed by a knitted metal or a crimped metal wire. The porosity and the number of filter layers of the filter material 2 are appropriately selected so that the thermal energy of the flame from the ignition means 6 is confined in the shaft end 2A of the filter material 2. In addition, gas amount regulation means

Since 3 3 is made of knitted wire mesh of finoleta material 2 or crimp-woven metal wire, a configuration without the inner cylinder 11 can also be adopted.

 According to this gas generator P 3, the heat energy due to the flame from the ignition means 6 can be trapped in the shaft end 2 A of the filter material 2. It is possible to improve the ignition performance of the gas generating agent 5 by eliminating the ignition delay of (5). As a result, the airbag can be optimally inflated and deployed.

The high-temperature gas generated in the housing 1 is Since it can also flow from 2 A, slag collection and cooling can be performed by effectively using the entire filter material 2.

 Further, concentration of the high-Pen gas generated in the early stage of combustion on the shaft end 2A of the filter material 2 can be restricted by the porosity of the filter material 2 and the number of filter layers. Thus, it is not necessary to strengthen the structure near the ignition means 7 in order to prevent heat loss of the filter material 2 and the like.

 Further, in the gas generator P3, the gas amount regulating means 33 is composed of a cylindrical material 11 and a knitted wire mesh of the filter material 2, or a cylinder regulating material 36 and a knitted material of the finoleta material 2. It can also be configured with a knitted wire mesh or the like. Further, in the gas generators P1 to P3, the configuration is shown in which the gas generating agent 5 is ignited and burned from one shaft end of the housing 1 by one ignition means 6, but the configuration shown in FIG. 9 can also be employed. In FIG. 9, the same symbols as those in FIGS. 1 to 4 denote the same members.

 The gas generator P4 shown in FIG. 9 has an ignition means 6 attached to lid members 8 and 9 which are shaft ends of the housing 1, respectively, and a cylindrical member 3 provided on each of the lid members 8 and 9. An annular space S′l is formed between the cylindrical member 3 and the inner periphery of each of the shaft ends 2 A and 2 B of the filter member 2. In the gas generator P4, instead of the cylindrical member 3 and the annular space S1, an ignition chamber 23 is formed in each of the lid members 8 and 9, and a gas amount regulating means 33 is provided. Can also. If necessary, the cylindrical member 3 and the annular space S 1 and the ignition chamber 23 can be formed only on one of the lid members 8 and 9, or the gas regulating means 33 can be provided. Further, the cylindrical member 3 and the annular space S 1, the ignition chamber 23, and the gas regulating means 33 are appropriately selected. For example, the R member 3 and the annular space S 1 are formed in the lid member 8, and the lid member 9 is formed. Combinations such as forming the ignition chamber 23 are also possible.

In this way, by attaching the two ignition means 6 to the gas generator P 4 and providing the cylindrical member 3 and the annular space S 1, the heat energy from each ignition means 6 can be reduced. The ignition performance of the gas generating agent 5 can be enhanced by being stored in the ignition chamber 23 formed by each cylindrical member 3.

 In addition, by adjusting the operation of each ignition means 6, the inflation and deployment of the airbag can be controlled. Specifically, by operating the two ignition means 6 with a slight time difference according to the type of collision of the car, the airbag is gradually expanded and deployed with a small amount of gas at the initial stage of deployment, and after a small time difference, It expands and deploys rapidly with clean gas. Also, in order to control the inflation and deployment of the airbag, a partition plate is inserted in the housing to define a sealed space S in the housing into two combustion chambers on the left and right sides, and each combustion means is used for each combustion means. A structure that ignites and burns a gas generating agent in a room can also be adopted.

 Next, a fifth embodiment of the gas generator according to the present invention will be described with reference to FIG.

 The gas generator P5 shown in FIG. 10 is one in which the inside of the housing 1 of the gas generators P1 to P4 is partitioned into a gas generation chamber S and a filter material chamber 30.

 In FIG. 10, the same symbols as those in FIGS. 1 to 9 denote the same members, and a description thereof will be omitted.

 The gas generator P5 shown in FIG. 10 includes a gas generation chamber S and a filter material chamber 30. The housing 1 is divided into a gas generating chamber S and a filter material chamber 30 by a partition plate 31. The cylindrical member 3 protrudes into the gas generating chamber S, forms an ignition chamber 23 on the inner periphery, and forms an annular space S1 with the outer cylindrical member 7.

The partition plate 31 has orifices 3 and 2 formed on the axis of the housing 1. The orifice 32 allows the gas generation chamber S and the filter material chamber 30 to communicate with each other. The partition plate 31 is placed at a predetermined position on the outer cylinder 7, and the outer cylinder 7 Is welded after being fixed by caulking from the outer peripheral side.

 The orifice 32 is closed by a burst plate 32 a attached to the partition plate 31. The burst plate 32 a is formed of a metal foil such as aluminum, and plays a role in moisture prevention and internal pressure adjustment in the gas generating chamber S. On the filter material chamber 30 side of the outer cylinder member 7, a plurality of gas discharge holes 7 a communicating the inside of the filter material chamber 30 and the airbag are formed. The gas discharge holes Ta are formed at predetermined intervals in the axial direction and the circumferential direction of the outer cylinder 7. However, the amount of protrusion of the cylindrical member 3 into the gas generation chamber S can be appropriately adjusted as described in FIGS. 1 and 3. As a result, heat energy can be stored in the ignition chamber 23 formed by the cylindrical member 3, and heat loss from the outer cylindrical member 7 of the housing 1 can be prevented. Therefore, the heat energy from the ignition means 6 can be efficiently used.

 Next, the operation of the gas generator P5 will be described.

 When the collision sensor detects the collision of the automobile, the gas generator P5 energizes and ignites the igniter 13 of the ignition means 6 to ignite the transfer agent 12. The flame of the transfer agent 1 2 is jetted out of the ignition hole 3 b into the ignition chamber 23, and the gas generating agent 5 is ignited and burned from the shaft end side of the housing 1 by the heat energy of the flame from the ignition means 6. This generates hot gas. The combustion in the ignition chamber 23 is performed by allowing the heat energy to escape into the ignition chamber 23 without escaping from the shaft end 33 of the outer cylinder 7. Accordingly, the gas generating agent 5 loaded in the ignition chamber 23 is effectively and instantaneously and stably ignited and burned by effectively utilizing all the heat energy from the ignition means 6.

The high-temperature gas and the like generated in the ignition chamber 23 are ejected into the gas generation chamber S, and transfer to the overall combustion of the gas generating agent 5 to generate a large amount of high-temperature gas. The high-temperature gas and the like from the gas generating chamber S are stored in the annular space S 1. 01 02540

High temperature gas is generated by igniting and burning the gas generating agent 5 through the gas generator 5. The high-temperature gas generated in the gas generating chamber S flows into the filter material chamber 30 through the orifice 32 of the partition plate 31 as the gas generating agent 5 burns. As a result, the high-temperature gas flows into the filter material chamber 30 內, where it is collected and cooled, and then discharged into the gas passage space S2.

 As the combustion of the gas generating agent 5 progresses and the inside of the filter material chamber 30 rises to a predetermined pressure, the burst plate 10 ruptures, and the uniform clean gas in the gas passage space S2 is discharged. It is discharged into the airbag through the gas discharge hole 7a. 'The airbag is now rapidly inflated and deployed by the clean gas released from each gas release hole 7a.

 As described above, according to the gas generator P5, the thermal energy of the flame from the ignition means 6 does not escape from the shaft end 33 of the housing 1, and the inside of the ignition chamber 23 formed by the cylindrical member 3 does not escape. Can be muffled. Therefore, in the initial stage from the start of the combustion of the gas generating agent 5, all the heat energy from the ignition means 6 is concentrated on the small amount of the gas generating agent 5 loaded in the ignition chamber 23, and instantaneously and stably. Can be ignited and burned. As a result, the gas generator P5 eliminates the ignition delay of the gas generating agent 5, enhances the ignition performance of the gas generating agent 5, and operates the airbag in the optimum time (millisecond) and the optimum clean gas. And the pressure increase. ,

 In addition, since the high-temperature gas generated in the housing 1 flows into the filter material chamber 30, the slag can be collected and cooled by effectively using the entire filter material 2. As a result, it is possible to increase the efficiency of collecting and cooling the slag of the high-temperature gas.

Furthermore, since the combustion of the gas generating agent 5 is performed on the gas generating agent 5 loaded in the ignition chamber 23, the concentration of high-temperature gas or the like on the shaft end 33 of the housing 1 in the initial stage of the combustion. Can be eliminated. As a result, In order to prevent heat loss from the housing 1, it is not necessary to strengthen the structure near the ignition means 6.

In the gas generator P5, as shown in FIG. 3, by forming gas ejection holes 3c in the axial direction and the circumferential direction of the cylindrical member 3, the heat energy stored in the cylindrical member 3 is reduced. Fine adjustment is possible. After the heat of the flame from the igniting means 6 is ejected into the ignition chamber 23, it is released into the annular space S1 を through the gas ejection holes 3c. As a result, the ignition and combustion of the gas generating agent 5 in the cylindrical member 3 can be finely adjusted to an optimum one, and the air bag is expanded at an optimum time (millisecond) with an optimum amount of a clean gas and an increased pressure. It can be expanded. In particular, sometimes a longer protrusion amount L of the cylindrical member 3, the thermal energy by the ignition means 6 becomes excessively ignition chamber 2 3 in Nico also Ri tendency, effects by finely adjusting the respective gas discharge holes 3 _C Can be something like that. In addition, the gas generating agent 5 in the annular space S1 can be ignited and burned by ejecting a high-temperature gas or the like generated in the ignition chamber 23 into the annular space S1.

 The gas outlets 3 c are preferably formed at predetermined intervals in the axial direction and the circumferential direction of the cylindrical member 3, whereby the high-temperature gas and the like in the ignition chamber 23 are transferred to the axis of the annular space S 1. The jet can be distributed evenly in the direction and the circumferential direction. As a result, all of the gas generating agent 5 loaded in the gas generating chamber S can be ignited and burned, and the amount of the gas generating agent loaded in the gas generating chamber S can be reduced. In addition, the housing 1 can be downsized.

 Further, in the gas generator P5, a configuration in which the inner cylindrical member 11 is provided on the inner peripheral portion of the filter material 2 in the filter material chamber 30 can be adopted.

Next, a sixth embodiment of the gas generator according to the present invention will be described with reference to FIG. The gas generator P6 shown in FIG. 11 has an ignition chamber 23 formed in a lid member 8 instead of the cylindrical member 3 and the annular space S1 in the gas generator P5 shown in FIG. Things.

 In FIG. 11, the same reference numerals as those in FIGS. 1 to 10 denote the same members, and a description thereof will be omitted.

 The gas generator P 6 shown in FIG. 11 includes a partition member 24 that defines a storage space S 內 with an ignition chamber 23 and a transmission chamber 14. The partition member 24 is screwed into the storage space S3 from the shaft end 33 side of the gas generation chamber S. In addition, the partition member 24 is provided with a fire hole 24a communicating the chambers 23 and 14. The ignition chamber 23 communicates with the gas generation chamber S, and its depth H is appropriately selected. As described above, by appropriately selecting the depth H and the inner diameter of the ignition chamber 23, it is possible to adjust the heat energy of the flame from the ignition means 6 that is confined in the ignition chamber 23. Further, the gas generating agent 5 is continuously loaded into the gas generating chamber S and the ignition chamber 23. It should be noted that the igniting means 6 may have a structure in which the igniter 13 and the transfer agent 12 are integrally formed without providing the partition member 24.

 Next, the operation of the gas generator P6 will be described.

When the collision sensor detects the collision of the vehicle, the gas generator P 6 energizes and ignites the igniter 13 of the ignition means 6 to ignite the transfer agent 12. The flame of the transfer agent 1 2 is jetted into the ignition chamber 23 through the igniter hole 24a, and the gas generating agent 5 is ignited and burned from the shaft end side of the housing 1 by the thermal energy of the flame from the ignition means 6. This generates hot gas. The combustion in the ignition chamber 23 is performed by allowing thermal energy to escape into the ignition chamber 23 without escaping from the shaft end 33 of the housing 1. Therefore, the gas generating agent 5 loaded in the ignition chamber 23 is effectively and instantaneously and stably ignited and burned by effectively utilizing all the heat energy from the ignition means 6. The high-temperature gas or the like generated in the ignition chamber 23 is ejected into the gas generation chamber S, and shifts to the overall combustion of the gas generating agent 5, thereby generating a large amount of high-temperature gas.

 The high-temperature gas generated in the housing 1 passes through the orifice 32 of the partition plate 31 and flows into the filter material chamber 30 內 along with the combustion of the gas generating agent 5, where the slag is collected and cooled. After that, it is discharged into the gas passage space S2.

 As the combustion of the gas generating agent 5 proceeds, the clean gas uniformized in the gas passage space S2 內 is discharged into the air bag through each gas discharge hole 7a in the same manner as in FIG. Thus, the airbag is rapidly inflated and deployed by the clean gas discharged from each gas discharge hole 7a.

 As described above, according to the gas generator P 6, the heat energy of the flame from the ignition means 6 can be stored in the ignition chamber 23 內 without escaping from the shaft end 33 of the housing 1. Therefore, in the initial stage from the start of the combustion of the gas generating agent 5, all the heat energy from the ignition means 6 can be concentrated on the gas generating agent 5 loaded in the ignition chamber 23 to instantaneously and stably ignite. Can be. As a result, the gas generator P 6 eliminates the ignition delay of the gas generating agent 5, enhances the ignition performance of the gas generating agent 5, and operates the air bag in the optimum time (millisecond) for the optimum clean gas. It is possible to expand and deploy with an increase in volume and pressure.

 Further, the gas generator P 6 transmits the high-temperature gas and the like generated in the ignition chamber 23 to the gas generating agent 5 loaded in the gas generating chamber S on a regular basis. Can be burned. For this reason, it is possible to eliminate the loading amount of the gas generating agent 5.

The high-temperature gas generated in the gas generation chamber S can flow into the filter material chamber 30 through the orifice 32 of the partition No. 31 and flow therethrough. Slag collection and cooling can be performed by effectively using the entire filter material 2. As a result, the efficiency of collecting and cooling the slag of the high-temperature gas can be improved.

 Furthermore, since the combustion of the gas generating agent 5 is performed on the gas generating agent 5 loaded in the ignition chamber 23, the concentration of high-temperature gas or the like on the shaft end 33 of the housing 1 in the initial stage of the combustion. Can be eliminated. As a result, it is not necessary to strengthen the structure near the ignition means 6 in order to prevent heat loss of the nozzle 1 and the like, and the housing 1 can be reduced in size.

 In the gas generators P1 to P6 according to the present invention, 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 P6, the ignition performance of the gas generating agent 5 can be enhanced, and nitrogen-containing gas having a lower ignition performance than the gas generating agent of a metal azide compound. Even if an organic compound gas generator 5 is used, ignition and combustion can be performed instantaneously and stably. In addition, as a gas generating agent, a compound containing a nitrogen-containing organic compound such as a tetrazole-based compound, a triazole-based compound, an amide-based compound, or a guanidine-based compound as a combustion component can be used. Next, the test result of the ignition performance of the gas generating agent in the gas generator P1 of the first embodiment will be described with reference to FIG.

As a test, the pressure rise characteristics were measured by setting the protrusion amount L of the cylindrical member 3 of the gas generator P1 to L = 3.0 mm and L = 10.0 mm. The pressure rise characteristics were measured by a 60-liter tank test. Here, the 60-litre tank test means that a gas generator P1 is installed in a 60-litre tank, the tank is sealed, and the ignition means 6 is energized and fired to generate gas. Thus, the change (increase rate) of the tank internal pressure is measured in relation to the passage of time (milliseconds). In addition, high temperature (85 ° C), normal temperature (23 ° C) and low temperature (140 ° C) The test was performed in an atmosphere of.

 The test results of the pressure rise characteristics of the gas generator P1 are shown in FIGS. 12 (a) and 12 (b). Fig. 12 (a) shows the test results when the protrusion amount of the cylindrical member 3 is L = 3mm, and the pressure rise characteristics vary depending on the temperature environment. Fig. 12 (b) shows the test results when the protrusion amount L of the cylindrical member 3 was 10.0 mm, and the pressure rise characteristics were stable even in the temperature environment. That is, in the gas generator P 1 in which the protrusion amount of the cylindrical member L = 10. Omm, the pressure increase rate can be increased from the start of the combustion of the gas generating agent 5, and in particular, substantially the same at normal temperature and low temperature. Pressure rise characteristics can be obtained. This means that by increasing the protrusion amount L of the cylindrical member 3 to a certain extent, the thermal energy from the ignition means 6 can be reliably stored in the cylindrical member 3 and the gas generating agent 5 can be instantaneously and stably stored. This is considered to be due to ignition and combustion. In particular, at low temperatures, thermal energy can be sufficiently stored in the cylindrical member 3, and it is considered that pressure characteristics substantially similar to those at normal temperature were obtained.

In this test, in consideration of the performance required for the gas generator P1, for example, the gas generator P1 was set to exceed 100 kPa in 20 milliseconds from the operation of the ignition means 6. By appropriately selecting the protrusion amount L of the cylindrical member 3 within a range of L = 3.0 mm to 10.10 mm, it is possible to sufficiently achieve the high temperature, the normal temperature, and the low temperature environment. -In addition, in the 60 liter tank test, the type of gas generating agent, the amount of gas generating agent 5 charged in the ignition chamber 23 內 formed by the cylindrical material 3, the inner and outer diameter of the cylindrical material 3 The pressure rise characteristics can also be adjusted and controlled depending on the dimensions, the presence or absence of the gas ejection holes 3a, and the like, and these can be appropriately selected to optimally inflate and expand the gas. Industrial applicability

 In the gas generator of the present invention, it is possible to inflate and deploy the airbag at the optimal time and by the optimal clean gas amount and pressure increase. In addition, by enhancing the effect of collecting and cooling high-temperature gas slag, it is possible to prevent minute high-temperature slag and the like from being released into the airbag, and to be able to inflate and deploy without damaging the airbag. Become.

Claims

The scope of the claims  1. A long cylindrical housing having a closed end, a cylindrical filter material mounted in the housing, and a high temperature gas generated by combustion formed on at least one shaft end of the housing. A gas generator comprising: a gas generating chamber in which a gas generating agent is loaded; and ignition means mounted on a shaft end of the housing having the gas generating chamber and igniting and burning the gas generating agent from the shaft end side. A gas generator, wherein a gas generating agent is housed inside the gas generating chamber, and an ignition chamber for restricting the outflow of gas from a central portion in a circumferential direction is adjacent to the ignition means. Generator.  2. A cylindrical member projecting into the gas generation chamber is provided at at least one shaft end of the housing where the ignition means is provided, and the ignition chamber is constituted by the cylindrical member. The gas generator according to claim 1, wherein  3. The gas generator according to claim 2, further comprising an annular space formed between an inner periphery of the housing and the cylindrical member. 4. The filter material is arranged between both shaft ends of the housing, and comprises: a shaft portion inner periphery of the filter material; and an annular space formed between the filter material and the cylindrical material. 3. The gas generator according to claim 2, wherein: ',  5. The gas generator according to claim 2, wherein the amount of protrusion of the cylindrical member is appropriately selected from a range of 3.0 mm to a filter material length X 0.5.  6. The gas generator according to claim 3, wherein the cylindrical member is formed with a gas ejection hole communicating with the inside of the cylindrical member and the annular space. 7. A gas jet communicating with the inside of the cylindrical material and the annular space is provided on the cylindrical material. -The gas generator according to claim 4, wherein an outlet is formed.  8. The gas generator according to claim 3, wherein the gas ejection holes are formed in a circumferential direction and an axial direction of the cylindrical member. 59. The gas generator according to claim 4, wherein the gas flow out holes are formed in a circumferential direction and an axial direction of the cylindrical material.  10. The gas generator according to claim 3, wherein the gas generating agent is also loaded in the annular space.  11. The gas generator according to claim 4, wherein the gas generating agent is also loaded in the annular space.  12. A space for accommodating the ignition means is provided in a lid member for closing at least one shaft end provided with the ignition means of the housing, and the ignition chamber is constituted by the space. The gas generator according to claim 1, wherein: , 5 13. The filter material is disposed between both ends of the housing, and a gas amount regulating means for regulating the inflow amount of the high-temperature gas flowing into the filter material is provided. 2. The gas generator according to claim 1, wherein the gas generator is constituted by gas amount regulating means.  14. The gas amount regulating means is constituted by an inner cylindrical member which is attached to the filter material and has a gas passage hole through which the high-temperature gas flows into the filter material. 14. The gas generator according to claim 13, wherein the flow rate of the high-temperature gas is regulated by the number of the gas passage holes formed and the opening area. 15. The gas amount regulating means is constituted by a wire mesh or a metal wire forming a filter layer of the filter material, and the porosity formed by the wire mesh or the metal wire, or of the wire mesh or the metal wire Claim 13 wherein the inflow amount of the high-temperature gas is regulated by the number of filter layers. A gas generator as described.  16. The gas generation according to claim 13, wherein the gas amount regulating means is formed such that a gas emission amount is regulated toward the ignition means side. vessel.  17. The gas generator according to claim 1, wherein the gas generating agent is a nitrogen-containing organic compound-based gas generating agent.