JP2007008205A - Filter for gas generator and gas generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter for a gas generator simple in structure without lowering gas generation, free to easily and inexpensively mass produce and free to miniaturize and lighten and the gas generator using it. <P>SOLUTION: This filter 10 for the gas generator is furnished with a hollow cylinder 1 having a plurality of through holes and a filter member 2 formed on an outer periphery of the hollow cylinder 1, and both ends of the hollow cylinder 1 are characteristically projected in the axial direction from both ends of the filter member 2. This gas generator 20 holds the filter 10 for the gas generator inside by using holding members 16, 17 and blocks the both ends of the hollow cylinder 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a filter for a gas generator used in an air bag system and the like for reducing the impact received by an occupant at the time of an automobile collision accident and improving the safety of the occupant, and a gas generator using the same.

  In order to protect the occupant from the impact caused by a car collision, the gas generator that instantly deploys the airbag is generated by burning the gas generating agent in the gas generation chamber so that the airbag is not damaged during deployment. A filter having a role of purifying the gas by cooling the high-temperature and high-pressure gas to an appropriate temperature and collecting high-temperature slag (residue) mainly composed of a metal oxide contained in the gas. It has. The gas generated by the combustion of the gas generating agent passes from the inside to the outside of the filter, and flows from the gas generator into the airbag through a plurality of gas passage holes provided in the housing along the outside of the filter. And deploy the airbag.

  Examples of such filters and gas generators for gas generators include those disclosed in Patent Documents 1 to 3 below. Patent Document 1 discloses that the gas generating agent burns between a gas generating agent that generates gas by burning when the vehicle suddenly decelerates and a gas inflow hole that allows the gas to flow into the folded bag body. An inflator filter for an air bag device that removes solid matter generated by the above, an annular case having a predetermined rigidity and formed with a large number of holes, and a wire mesh wound around the outer peripheral surface of the case There are disclosed an inflator filter for an airbag device and an inflator using the same. In Patent Document 2, a ceramic sheet layer is provided on the outer periphery of a cylindrical protective inner cylinder having a large number of through-holes on the cylinder wall. A filter for an inflator, in which a wire mesh buffer is laminated in a cylindrical shape on the outer periphery, and a cylindrical protective outer cylinder having a large number of through-holes is laminated on the outer periphery thereof, and an inflator using the same Is disclosed. Patent Document 3 discloses a gas generator including a cylindrical housing having a plurality of gas discharge holes, in which a burst material previously formed into a cylindrical shape is inserted, and the burst material is inserted into the burst material. In addition to closing all the gas discharge holes of the housing, a cylindrical filter member is disposed on the burst material, and the filter member is filled with a gas generating agent that generates high-temperature gas by combustion. The gas generator is disclosed in which the burst material is broken as the gas pressure in the housing increases due to combustion of the gas generating agent.

JP-A-6-255440 JP-A-7-285413 International Publication No. WO00 / 044594 Pamphlet

  However, in the filter for a gas generator as disclosed in Patent Documents 1 to 3, it is difficult to further reduce the size and weight without reducing the amount of gas generated.

  Therefore, the present invention has an object to provide a filter for a gas generator that has a simple structure, can be mass-produced easily and inexpensively, can be reduced in size and weight, and a gas generator that can be reduced in size and weight using the same. It is what.

Means and effects for solving the problems

  In order to solve the above problems, a gas generator filter according to the present invention includes a metal housing, a combustion chamber formed in the housing and containing a gas generating agent that generates high-temperature gas by combustion, and the housing. A gas which is mounted around the combustion chamber and used for a gas generator having an ignition means for igniting and burning the gas generating agent in the combustion chamber and through which the gas generated in the combustion chamber passes A filter for a generator, comprising: a hollow cylinder having a plurality of through holes, at least one bottom surface of which is open; and a filter member formed on an outer periphery of the hollow cylinder, wherein both ends of the hollow cylinder are the filter members It protrudes in the axial direction from.

  With the above configuration, the filter member can be reduced in size and weight, so that it is possible to provide a gas generator filter that is simple and inexpensive and can be mass-produced easily and at low cost. Further, when incorporated in the gas generator, damage to the filter member due to combustion of the gas generating agent can be reduced by the hollow cylinder, and a residue generated by the combustion can be prevented from flowing out of the gas generator. Further, in the conventional filter, when the gas generating agent is filled in the filter, the upper end of the filter serves as a “weir” that prevents the gas generating agent from spilling. For this reason, the vertical length of the filter needs to correspond to the vertical length of the gas generating agent storage chamber. That is, conventionally, a useless portion that is not effective in cooling the high-temperature gas, which is the original role of the filter, and reducing the amount of residue flowing out of the gas generator has been configured. In the present invention, since only the both ends of the hollow cylinder protrude in the axial direction from the filter member, only these both ends serve as “weirs”. As a result, the filter member can be reduced in size and weight in the axial direction, and as a result, the gas generator can be reduced in size and weight. Furthermore, even when the housing is expanded vertically in the axial direction in order to increase the amount of the gas generating agent, in the present invention, it is sufficient to lengthen only the hollow cylinder. Since it is not necessary to enlarge the vertical direction of the member, the weight can be minimized while maintaining the filter effect.

  It is preferable that the filter for gas generators of this invention does not have the said through-hole in the axial direction both ends protrusion part of the said hollow cylinder.

  If it is the above-mentioned composition, it was formed in the inside of the hollow cylinder where the gas generating agent is loaded, and the housing by covering the axially opposite end protruding part outside and the axially opposite end protruding part of the hollow cylinder with a lid member or the like. Since the outside of the filter member with the gas discharge hole is electrically connected only by passing through the filter member, the gas and residues generated by the combustion of the gas generating agent must be surely attached to the filter member when incorporated in the gas generator. Passing through the filter, it is possible to reliably obtain the cooling and residue collecting effect by the filter. Further, by covering and closing the axially opposite end protruding parts outside and the axially opposite end protruding parts of the hollow cylinder with a lid member or the like, even when the metal housing is deformed by the internal pressure of the container after ignition, the deformation amount is hollow. If it is smaller than the axial length of the part that does not have a through-hole at both ends of the cylinder in the axial direction, the gas and residue generated by the combustion of the gas generating agent will always pass through the filter member. A residue collecting effect can be reliably obtained.

The filter for a gas generator of the present invention is injected at the time of ignition from the ignition means when incorporated in the gas generator having the ignition means by forming the through holes in desired shapes, sizes, and positions, respectively. It is preferable that the flame is blocked by a part of the cylinder to protect the filter member and to control the gas flow path.
By adjusting the through-holes to the desired shape, size, and position, the flame injected from the ignition means directly hits the filter member, so that the filter member can be prevented from being melted and the gas flow path is controlled. Therefore, an efficient filter configuration is possible.

In the gas generator filter of the present invention, the filter member has a first filtration cooling section formed on the outer periphery of the hollow cylinder, and a length shorter than the axial length of the outer periphery of the first filtration cooling section. It is preferable that the 1st filtration cooling part and the 2nd filtration cooling part are formed in the axial direction both ends projecting step shape. .
By forming both ends of the filter for the gas generator in a stepped manner as in the above configuration, even if the inner side of the housing of the gas generator has a curved shape, it can correspond to the shape, so the housing can be efficiently A filter for a gas generator that can be disposed inside can be provided. In addition, even if the said 1st filtration part and said 2nd filtration part of the staircase shape in the above-mentioned are integral structures, the same effect can be acquired.

In the gas generator filter of the present invention, it is preferable that the filter member is a winding formed by winding a wire around the outer periphery of the hollow cylinder.
According to the said structure, since it is a simple structure, while being able to manufacture easily, the filter for gas generators with high filter performance can be provided. Moreover, since the winding is formed by winding a wire around the outer periphery of the hollow cylinder, the shape of the filter member made of the winding can be easily maintained. Further, by winding the wire around the outside of the hollow cylinder, the hollow cylinder and the filter member can be integrated, so that it is difficult to be deformed and the number of parts can be reduced.

In the gas generator filter of the present invention, the filter member is formed by winding a metal plate having a plurality of holes and a protrusion around the hole around the outer periphery of the hollow cylinder. Is preferred.
According to the said structure, since it is a simple structure, while being able to manufacture easily, the filter for gas generators with high filter performance can be provided.

In the gas generator filter of the present invention, the hollow cylinder is preferably formed by processing a wire mesh or a perforated plate.
Since it has a simple configuration, it can be easily manufactured and an inexpensive gas generator filter can be provided.

The gas generator of the present invention includes a metal housing formed of an initiator shell and a closure shell, a combustion chamber formed in the housing and containing a gas generating agent that generates a high-temperature gas by combustion, A filter disposed around a combustion chamber, a holding member for holding the filter member in the housing, an ignition means attached to the housing and igniting and burning the gas generating agent in the combustion chamber; A gas generator formed in a housing and having a plurality of gas discharge holes for discharging the gas generated in the combustion chamber, wherein the filter is any one of the above-described filters for a gas generator. Is preferred.
By the said structure, the gas generator which has the effect of each filter for gas generators mentioned above can be provided.

In the gas generator according to the present invention, the hollow cylinder is formed in a first through-hole group formed in a circumferential belt-like region, and in a circumferential belt-like region having a predetermined distance from the first through-hole group. The second through-hole group, and a portion that does not have a through-hole formed between the first through-hole group and the second through-hole group, and when the ignition means is ignited, It is preferable that a fire transfer hole for injecting a flame is provided in the direction of the portion having no through hole.
With the above-described configuration, the filter member is protected from the flame that is injected from the ignition means at the time of ignition.

In the gas generator of the present invention, it is preferable that the holding member is a lid member that holds the outer periphery of the protruding portion at both ends in the axial direction of the hollow cylinder and seals the openings at both ends of the hollow cylinder.
As described above, the opening is sealed while holding the outer periphery of both ends of the hollow cylinder by the holding member, so that the assembling property can be improved. Further, conventionally, since the holding member was inserted inside the filter, there was a problem that the gas generating agent was broken, but according to the present invention, the gas generating agent is broken during assembly. There is also an effect that there is no.

  In addition, the above-mentioned axial direction both ends protrusion part has shown the part which the hollow cylinder protrudes up and down to the axial direction with respect to the filter member. Further, when the holding member holds the outer periphery of the projecting portion at both ends in the axial direction, it is not necessary to cover all the projecting portions at both ends in the axial direction, and covers the amount of deformation of the housing of the gas generator after ignition in the axial direction. Anything is fine.

  An embodiment of the present invention will be described with reference to FIGS. 1 is a sectional view showing a gas generator filter according to an embodiment of the present invention, FIG. 2 is a developed view of a hollow cylinder used in the gas generator filter of FIG. 1, and FIG. 3 is a gas according to the present invention. FIG. 4 is an external view of the gas generator shown in FIG. 3, and FIG. 5 is another example of the gas generator using the gas generator filter according to the present invention.

  A gas generator filter 10 (hereinafter, simply referred to as a filter 10) in the present embodiment includes a hollow cylinder 1 and a filter member 2 as shown in FIG. 1.

  As shown in FIG. 2, the hollow cylinder 1 is formed by processing a single metal plate 9 into a cylindrical shape so that the longitudinal direction thereof is a curved portion. In the metal plate 9, a plurality of through holes 9A are provided at desired positions, and strip-shaped regions 9a, 9c, 9e having no holes and strip-shaped regions 9b, 9d having holes are formed in the longitudinal direction. . In addition, the position where the through-hole 9A is provided, the size, and the shape thereof are appropriately changed according to the desired performance. For example, when it is desired to partially block the flame from the ignition means in the gas generator, the through hole 9A is a region where the through hole 9A is formed at a position where the region 9c can block the flame. 9b and 9d (see FIG. 2). Moreover, as arrangement | positioning structure in the area | regions 9b and 9d of 9 A of through-holes, what adjoined through-hole 9A mutually (refer FIG. 2), what was put in order to form a regular matrix, etc. are mentioned. .

  For the metal plate 9, for example, stainless steel, iron, steel or the like can be used. The hollow cylinder 1 may be not only a punching metal such as the metal plate 9 but also an expanded metal or a wire mesh.

  The filter member 2 includes a filtration cooling unit 2a formed on the outer periphery of the hollow cylinder 1, and a filtration cooling unit 2b formed on the outer periphery of the filtration cooling unit 2a so as to be shorter than the length in the axial direction. ing. And the filtration cooling parts 2a and 2b are formed in a two-step staircase shape at both ends in the axial direction, and so as to cover the regions 9b, 9c and 9d of the metal plate 9 processed into the hollow cylinder 1. Is formed. Accordingly, when the hollow cylinder 1 and the filter member 2 are considered as one body, the gas generator filter 10 has a total of three-step staircase shapes in which both ends of the hollow cylinder 1 protrude in the axial direction from both ends of the filter member 2. . Note that the filtration cooling unit may only cover the regions 9b and 9d.

  The filtration and cooling units 2a and 2b are, for example, those obtained by processing a knitted wire mesh, a plain weave wire mesh, or a simple expanded metal, or an expanded metal having a protruding portion around the periphery of the through hole. However, it is preferable to use a wire formed of a wire formed by winding with a predetermined gap so that a certain amount of gas can pass through the wire. Further, a filtration cooling part may be further formed around the filtration cooling part 2b to form the filter member 2 having three or more steps, or may not have a step shape. Moreover, even if the filtration cooling parts 2a and 2b are formed integrally, they may be formed separately.

  According to this embodiment, since the filter member 2 can be reduced in size and weight, it is possible to provide a gas generator filter 10 that is simple in structure and can be mass-produced easily and inexpensively and is reduced in size and weight. Further, when incorporated in the gas generator, the hollow cylinder 1 can reduce damage to the filter member 2 due to combustion of the gas generating agent, and can suppress the outflow of the residue generated by the combustion to the outside of the gas generator. Furthermore, since it is a simple structure, it can manufacture easily and can provide the filter 10 for gas generators with high filter performance.

  Further, with respect to the shape retention strength, the filter 10 in the present embodiment is far superior to a filter using only a conventional metal wire assembly. In a filter using only a conventional metal wire assembly, if the shape retention strength of the filter member is not sufficient, the filter member may be deformed when subjected to gas pressure, and the filter member itself may be damaged. If the filter member is damaged in this way, for example, when used as a part of a gas generator of an airbag system, high-temperature slag leaks into the airbag, resulting in damage to the airbag. Not only does it degrade, but there is also the risk of occupants getting burned. From this point of view, it is important to secure the shape retention strength by using the hollow cylinder 1 on the inner side in the filter 10.

  Next, an embodiment of a gas generator according to the present invention using the gas generator filter 10 will be described. In FIG. 3, a gas generator 20 inflates and deploys an airbag. The gas generator 20 has a substantially spherical housing 3 formed by joining an initiator shell 3a to a closure shell 3b by pressure welding, welding, or the like, and the housing 3 A combustion chamber 5 that is formed in the chamber and loaded with a gas generating agent 4 that generates high-temperature gas by combustion, a gas generator filter 10 disposed around the combustion chamber 5, and the housing 3 are attached to the combustion chamber 5. And ignition means 6 for igniting and burning the gas generating agent 4 therein. The initiator shell 3a and the closure shell 3b are made of a metal such as iron, stainless steel, aluminum, or steel.

The initiator shell 3a includes a cylindrical portion 3a ₁ and a hemispherical end plate portion 3a ₂ formed continuously from the cylindrical portion 3a ₁ . And, in the center of the end plate portion 3a _2, an ignition means 6 is provided. The ignition means 6 has a bottomed inner cylindrical body 12 having a plurality of fire transfer holes 11 around, a heat transfer agent 13 loaded in the inner cylinder 12, and a contact with the heat transfer agent 13. And an igniter 14 provided.

The inner cylinder 12 is fixed to the ignition means holding part 15 by an arbitrary method such as caulking. The inner cylinder 12 is fixed to the initiator shell 3a by fixing the ignition means holding part 15 to the end plate part 3a ₂ by any method such as welding. The inner cylindrical body 12 has a long cylindrical shape that extends from one end side of the combustion chamber 5 formed in the housing 3 to the approximate center of the combustion chamber 5. A plurality of heat transfer holes 11 are formed in a long hole shape along the axial direction of the inner cylinder 12 around the periphery. These heat transfer holes 11 are arranged side by side along the circumferential direction of the inner cylinder 12. In addition, it may be formed zigzag along the circumferential direction so as not to be arranged side by side. In this case, the heat flow ejected from the ignition means 6 is efficiently ejected into the entire combustion chamber 5. Further, the heat transfer hole 11 may be formed at the top of the inner cylinder 12. Furthermore, these heat transfer holes 11 do not have to be round holes, but may be elongated holes.

Closure shell 3b is provided with a cylindrical portion 3b _1, the end plate portion 3b ₂ of hemispherical shape formed continuously from the cylindrical portion 3b _1, and a flange portion 3b ₃ extending from the cylindrical portion 3b ₁ radially outward Yes.

In the cylindrical portion 3b ₁ of the closure shell 3b, a plurality of gas discharge holes 7 (7a and 7b in FIG. 4) are preferably formed in a zigzag manner in two rows. By forming the gas discharge holes 7 in a zigzag manner, the gas generated in the housing 3 is discharged without being concentrated, so that damage to the filter member 2 is suppressed. Further, the filter member 2 can be used in a wide range, and the filter member 2 can be used efficiently. In addition to being formed in a zigzag manner, these gas discharge holes 7 may be formed in a single row, for example, or the same effect can be obtained by forming a plurality of rows such as two rows or three rows. it can.

The gas discharge holes 7a, 7b are aluminum strip affixed to the inner periphery of the cylindrical portion 3b _1, closed steel, the rupture member 8 of the strip tape such as stainless steel, the combustion chamber 5 is sealed Yes. The rupture member 8 is provided so that the thickness and strength thereof vary depending on the hole diameters of the gas discharge holes 7 a and 7 b and the desired performance of the gas generator 20.

In the housing 3 constituted by the initiator shell 3a and the closure shell 3b, a filter 10 disposed around the combustion chamber 5 is provided along the inner walls of the cylinder portions 3a ₁ and 3b ₁ . The outer periphery (region where no hole is present) of both ends of the hollow cylinder 1 in the filter 10 and both end surfaces of the filtration cooling unit 2a are provided on the inner surfaces of the end plate portions 3a ₂ and 3b ₂ of the initiator shell 3a and the closure shell 3b, respectively. The holding members 16 and 17 are fixed and held. The holding members 16 and 17 are also members for closing so that gas does not leak from both ends of the hollow cylinder 1. The holding members 16 and 17 do not have to cover the entire outer periphery of the outer periphery of the both ends of the hollow cylinder 1 (the region where no hole is present), as long as it covers more than the housing deformation amount in the gas generator after ignition. good.

  A gas generating agent 4 is loaded on the inner periphery of the filter 10. These gas generating agents 4 serve as combustion chambers 5 that are combusted by the heat flow from the ignition means 6.

  Next, the operation of the gas generator 20 will be described. Here, the case where it is mounted on an airbag system will be described as an example. When a collision sensor (not shown) detects a vehicle collision, the igniter 14 of the ignition means 6 is ignited by the collision detection signal to ignite the transfer agent 13, and the flame is a transfer hole of the inner cylinder 12. 11 is ejected toward the gas generating agent 4, the gas generating agent 4 is ignited, and high-temperature high-pressure gas is generated. At this time, if the hollow cylinder 1 is designed so that there is no through hole in the portion where the flame is transferred by the transfer agent 13, it is possible to prevent the flame from directly hitting the filter member 2 and being damaged. The generated high-temperature and high-pressure gas flows into the filter 10, passes through the filter member 2 in the radial direction and the circumferential direction, and flows into the space between the outer peripheral surface of the filter member 2 and the inner surface of the housing 3. When the combustion of the gas generating agent 4 further proceeds and the inside of the housing 3 reaches a predetermined pressure, the rupture member 8 closing each gas discharge hole 7 is ruptured, and between the outer peripheral surface of the filter member 2 and the inner surface of the housing 3. The clean gas having a uniform pressure in the space is discharged from each gas discharge hole 7 to an airbag (not shown), and the airbag is rapidly inflated and deployed. In the process of flowing the gas through the filter 10, the slag component is gradually removed while being repeatedly collided with the hollow cylinder 1 and the filter member 2 as described above, and the air bag is cooled from each gas discharge hole 7. Will be released inside.

  According to this embodiment, the following effects can be obtained. In the conventional filter, when the gas generating agent is filled in the filter, the upper end portion of the entire filter serves as a “weir” that prevents the gas generating agent from spilling. For this reason, the vertical length of the filter needs to correspond to the vertical length of the gas generating agent storage chamber. In the present invention, since only the both ends of the hollow cylinder 1 protrude from the filter member 2 in the axial direction, only these both ends serve as a weir. As a result, the filter member 2 can be downsized in the axial direction, and the gas generator 20 can also be downsized. Further, even in the case of the present invention, it is sufficient to lengthen only the hollow cylinder 1 in the case of the present invention in order to increase the capacity of the gas generating agent, in the case of the present invention. Since it is not necessary to enlarge the vertical direction of the filter, the weight can be minimized.

  Further, both ends of the hollow cylinder 1 are closed by the holding members 16 and 17, and the inside of the hollow cylinder 1 and the outside of the filter member 2 are conducted only through the filter member. The direct outflow of gas and residue generated by the above can be prevented.

  Further, by adjusting the through hole 9A of the hollow cylinder 1 to a desired shape, size, and position, the filter member 2 can be protected from the flame injected from the ignition means 6 at the time of ignition. The member can be prevented from being melted, the deterioration of the filter performance can be suppressed, the gas flow path can be controlled, and an efficient filter configuration can be realized.

  Further, by forming both end portions of the gas generator filter 10 in a stepped shape, even if the inner side of the housing of the gas generator 20 has a curved shape as shown in FIG. 2, it can correspond to the shape. Therefore, since the gas generator filter 10 can be efficiently disposed in the housing 3, the gas generator 20 can be downsized while maintaining performance.

  Further, when the ignition means 6 further includes a heat transfer hole for injecting a flame in the axial direction of the hollow cylinder 1, the gas generating agent present above the ignition means is replaced with the gas present around the ignition means. It can be efficiently burned almost simultaneously with the generating agent.

  Furthermore, since the holding members 16 and 17 are closed while holding the outer periphery of both ends of the hollow cylinder, the assemblability of the gas generator 20 can be improved. Further, conventionally, since the holding member is inserted inside the filter, there is a problem that the gas generating agent accommodated in the filter is broken. There is also an effect that the generator is not broken.

  Next, another embodiment of the gas generator according to the present invention will be shown. In FIG. 5, a gas generator 40 according to another embodiment inflates and deploys an air bag, and is formed by joining an initiator shell 33a to a closure shell 33b by pressure welding, welding, or the like, and a substantially short cylindrical housing. 33, a combustion chamber 35 formed in the housing 33 and loaded with a gas generating agent 34 that generates high-temperature gas by combustion, a gas generator filter 30 disposed around the combustion chamber 35, and the housing 33 And an igniting means 36 that ignites and burns the gas generating agent 34 in the combustion chamber 35. In addition, each member to which the code | symbol 1-8, 10-17 is referred in the above-mentioned gas generator 20, and each member to which the code | symbol 31-38, 40-47 is given in this embodiment are the same in order. Therefore, explanations may be omitted except for differences.

The housing 33 includes an initiator shell 33a and a closure shell 33b, and has a substantially disk shape. The initiator shell 33a includes a cylindrical portion 33a ₁ and a substantially dish-shaped end plate portion 33a ₂ formed continuously from the cylindrical portion 33a ₁ . And, in the center of the end plate portion 33a _2, the ignition means 36 is provided. The ignition means 36 has a bottomed inner cylindrical body 42 having a plurality of heat transfer holes 41 around it, a heat transfer agent 43 loaded in the inner cylinder 42, and a contact with the heat transfer agent 43. The igniter 44 is provided.

Closure shell 33b includes a cylindrical portion 33b _1, is composed of a plate portion 33b ₂ of Ryakusara shape formed continuously from the cylindrical portion 33b _1, a flange portion 33b ₃ extending from the cylindrical portion 33b ₁ radially outward ing.

  The gas generator filter 30 includes a hollow cylinder 31 formed of a metal plate having the same configuration as that of the metal plate 9 and the filter member 32 in the same manner as the hollow cylinder 1 described above. The filter member 32 is formed on the outer periphery of the hollow cylinder 31 and has a filtering function. The metal plate processed into the hollow cylinder 31 is formed so as to cover a predetermined region (regions similar to the regions 9b, 9c, 9d of the metal plate 9). The filter member 32 can be made of the same material as that of the filter member 2 described above.

  Next, the operation of this embodiment will be described. Here, the case where it is mounted on an airbag system will be described as an example. When a collision sensor (not shown) detects a vehicle collision, the igniter 44 of the ignition means 36 is ignited by the collision detection signal to ignite the transfer agent 43, and the flame is a transfer hole of the inner cylinder 42. 41 is ejected toward the gas generating agent 34, the gas generating agent 34 is ignited, and high-temperature high-pressure gas is generated. The generated high-temperature and high-pressure gas flows into the filter 30, passes through the filter member 32 in the radial direction and the circumferential direction, and flows into the space between the outer peripheral surface of the filter member 32 and the inner surface of the housing 33. When the gas generating agent 34 further burns and the inside of the housing 33 reaches a predetermined pressure, the rupture member 38 closing each gas discharge hole 37 is ruptured, and the gap between the outer peripheral surface of the filter member 32 and the inner surface of the housing 33 is broken. The clean gas having a uniform pressure in the space is discharged from each gas discharge hole 37 to an airbag (not shown), and the airbag is rapidly inflated and deployed. In the process of flowing the gas through the filter 30, the slag component is gradually removed while being repeatedly collided with the hollow cylinder 31 and the filter member 32 as described above, and the air bag is cooled from each gas discharge hole 37. Will be released inside.

According to this embodiment, substantially the same effect as the gas generator 20 can be obtained. However, since there is no large curved portion like the gas generator 20 on the inner side of the housing 33, it is not necessary to form both ends of the gas generator filter 30 in a stepped manner. There is no effect like the generator 20.
Note that an igniter, a gas generating agent, a housing, and the like, which are not described in detail in this specification, are described in, for example, Japanese Patent Application Laid-Open No. 2005-53382 or the above-described background art. Those disclosed in the literature are used and are not particularly limited.

  The present invention can be changed in design without departing from the scope of the claims, and is not limited to the above-described embodiments and examples.

It is sectional drawing which shows the filter for gas generators which concerns on one Embodiment of this invention. It is the figure which expand | deployed the hollow cylinder used for the filter for gas generators of FIG. It is an example of the gas generator using the filter for gas generators concerning the present invention. It is an external view of the gas generator shown in FIG. It is another example of the gas generator using the filter for gas generators concerning the present invention.

Explanation of symbols

1,31 hollow cylindrical 2,32 filter member 2a, 2b filtered cooling unit 3,33 housing 3a, 33a initiator shell 3b, 33b closure shell 3b _3, 33b ₃ flange portion _{3a 1, 3b 1, 33a 1} , 33b 1 cylinder portion 3a ₂ , 3b ₂ , 33a ₂ , 33b ₂ End plate parts 4, 34 Gas generating agent 5, 35 Combustion chamber 6, 36 Ignition means 7, 37 Gas discharge hole 7 a, 37 a Gas discharge hole 8, 38 Rupture member 9 Metal plate 9 A Through hole 10, 30 Gas generator filter 11, 41 Fire transfer hole 12, 42 Inner cylinder 13, 43 Fire transfer agent 14, 44 Igniter 15, 45 Ignition means holding part 16, 17, 46, 47 Holding member 20, 40 Gas generator

Claims (10)

A metal housing, a combustion chamber formed in the housing and containing a gas generating agent that generates a high-temperature gas by combustion, and an ignition that is attached to the housing and ignites and burns the gas generating agent in the combustion chamber A gas generator filter disposed around the combustion chamber and through which a gas generated in the combustion chamber passes, used in a gas generator comprising:
A hollow cylinder having a plurality of through-holes on a side surface and having at least one bottom surface opened; and a filter member formed on an outer periphery of the hollow cylinder, wherein both axial projecting portions of the hollow cylinder are formed from the filter member. A filter for a gas generator characterized by protruding in the axial direction.   2. The gas generator filter according to claim 1, wherein the through-holes are not formed in protruding portions at both ends in the axial direction of the hollow cylinder.   By forming the through holes in a desired shape, size, and position, respectively, a flame that is injected from the ignition means at the time of ignition when incorporated in the gas generator having the ignition means is one of the cylinders. The gas generator filter according to claim 1 or 2, wherein the filter member is protected by blocking a portion and the gas flow path is controlled. The filter member includes a first filtration cooling unit formed on the outer periphery of the hollow cylinder, and a second filter cooling unit formed on the outer periphery of the first filtration cooling unit so as to be shorter than the axial length thereof. And a filtration cooling part,
The said 1st filtration cooling part and the said 2nd filtration cooling part form the step shape in at least one of the axial direction both ends protrusion part, The any one of Claims 1-3 characterized by the above-mentioned. A filter for a gas generator according to 1.   The gas filter according to any one of claims 1 to 4, wherein the filter member is a winding formed by winding a wire around the outer periphery of the hollow cylinder.   The filter member is formed by winding a metal plate having a plurality of holes and having a protruding portion around the hole around the outer periphery of the hollow cylinder. The filter for gas generators of any one of these.   The gas generator filter according to any one of claims 1 to 6, wherein the hollow cylinder is formed by processing a wire mesh or a perforated plate. A metal housing formed of an initiator shell and a closure shell;
A combustion chamber formed in the housing and containing a gas generating agent that generates a high-temperature gas by combustion;
A filter disposed around the combustion chamber;
A holding member for holding the filter member in the housing;
Ignition means mounted on the housing and igniting and burning the gas generating agent in the combustion chamber;
A gas generator formed in the housing and having a plurality of gas discharge holes for discharging the gas generated in the combustion chamber,
The gas generator according to any one of claims 1 to 7, wherein the filter is a filter for a gas generator. The hollow cylinder includes a first through-hole group formed in a circumferential belt-like region, a second through-hole group formed in a circumferential belt-like region having a predetermined distance from the first through-hole group, A portion having no through hole formed between the first through hole group and the second through hole group;
The gas generator according to claim 8, wherein the ignition means includes a heat transfer hole for injecting a flame in a direction of the portion not having the through hole when ignited.   The gas according to claim 8 or 9, wherein the holding member is a lid member that holds the outer periphery of the protruding portion at both ends in the axial direction of the hollow cylinder and seals the openings at both ends of the hollow cylinder. Generator.

Images