JP2019098956A - Gas generator - Google Patents

Abstract

To restrain the situation of igniting a gas generating agent in the unintentional timing in a dual type gas generator.SOLUTION: In a gas generator having a first igniter, an initial stage combustion chamber housing for storing the first igniter, that is, the initial stage combustion chamber housing for forming an initial stage combustion chamber for executing combustion of a prescribed combustion substance filled in the initial stage combustion chamber housing by actuation of the first igniter and an outer shell housing for storing the initial stage combustion chamber housing and forming a gas discharge port, the outer shell housing comprises a latter stage combustion chamber partitioned on its inside by a prescribed partition wall, that is, the latter stage combustion chamber for executing combustion of a gas generating agent filled in the latter stage combustion chamber on and after the combustion of the prescribed combustion substance in the initial stage combustion chamber, and a prescribed clearance is formed between at least a part of the prescribed partition wall and the initial stage combustion chamber housing.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a gas generator that burns a gas generating agent to generate a combustion gas by explosive combustion in an igniter.

  BACKGROUND ART A gas generator that burns a gas generating agent by pyrotechnic combustion in an igniter is widely used as one that achieves a desired operation by the generated combustion gas. Such a gas generator can be used, for example, as a drive source for deploying an air bag of an air bag device mounted on a vehicle or the like. In such a gas generator, it is necessary to burn the gas generating agent as desired in order to generate the combustion gas as designed.

  For example, in the gas generator shown in Patent Document 1, in the two combustion chambers defined by the partition members, the gas generating agents loaded in the respective combustion chambers are respectively provided by igniters disposed in the respective combustion chambers. It burns independently. And in this gas generator, a cushion member is further provided in the partition member.

  Further, in the gas generator shown in Patent Document 2, two chambers of an upper combustion chamber and a lower combustion chamber separated from each other are formed by the partition member, and the gas generating agent is loaded in each of the combustion chambers. In this gas generator, an igniter for burning only the gas generating agent in one combustion chamber is disposed, and the gas generating agent in the other combustion chamber is the combustion heat generated by the combustion of the gas generating agent in the one combustion chamber. It is ignited by heat transfer. Here, the partition member is provided with a cushion member that controls heat transfer of combustion heat. As a result, the transfer of the combustion heat generated in one combustion chamber can be delayed, and the time difference between the start of combustion in the upper and lower combustion chambers can be controlled.

JP-A-11-217055 Unexamined-Japanese-Patent No. 11-091495 gazette U.S. Patent No. 6032979

  In a so-called dual type gas generator in which gas generating agents are filled in each of the mutually isolated combustion chambers, it is required to burn the gas generating agents filled in each combustion chamber at a desired timing. ing. Here, in the conventional dual type gas generator, since each of the two combustion chambers is defined by a common partition member, heat is easily transferred between the two combustion chambers via the partition member. Therefore, according to the prior art, the cushion member is provided on the partition member, but in the cushion member having a function to prevent powdering of the gas generating agent due to vibration and a function as a heat insulating material, two cushion members are provided via the partition member. The heat transfer between the combustion chambers can not be sufficiently controlled. Therefore, there is a possibility that the gas generating agent in the other combustion chamber may be ignited at an unintended timing by the transmission of the combustion heat generated in the one combustion chamber. As described above, according to the prior art, there is a possibility that it is not possible to express an arbitrary operation mode, such as burning the gas generating agent charged in each combustion chamber at a desired timing.

  An object of the present invention is, in view of the above-mentioned problems, to suppress as much as possible the situation where the gas generating agent is ignited at unintended timing in the dual type gas generator.

  The gas generator of the present invention is a dual type gas generator comprising an initial combustion chamber filled with a predetermined combustion substance to be combusted by the operation of the first igniter, and a late combustion chamber filled with a gas generating agent It is. And in order to solve the above problems, in the gas generator of the present invention, the initial combustion chamber is formed by the initial combustion chamber housing, and the latter combustion chamber is defined by the predetermined partition, and further, at least one of the predetermined partitions. A predetermined gap is formed between the part and the initial combustion chamber housing. With such a configuration, it is possible to suppress as much as possible the situation where the gas generating agent charged in the late combustion chamber is ignited at unintended timing.

  Specifically, the gas generator according to the present invention is a first igniter and an initial combustion chamber housing that accommodates the first igniter, and the operation of the first igniter allows the gas generator to be inside the initial combustion chamber housing. An initial combustion chamber housing forming an initial combustion chamber in which combustion of a predetermined combustion substance filled in the housing is performed; and an outer shell housing accommodating the initial combustion chamber housing and forming a gas outlet. The outer shell housing is a late combustion chamber defined therein by a predetermined partition, and the combustion of the gas generating agent charged in the late combustion chamber is the predetermined combustion in the initial combustion chamber. There is a late combustion chamber which takes place after the burning of the substance, and a predetermined gap is formed between at least a part of the predetermined partition and the initial combustion chamber housing.

  In the above gas generator, when gas generation is required, the first igniter is first activated, and the predetermined igniter that is charged in the initial combustion chamber is burned by the operation of the first igniter. Then, a combustion product (combustion gas) generated by the combustion of a predetermined combustion substance is discharged from the gas outlet. At this time, the heat of combustion due to the combustion of a predetermined combustion substance may affect the gas generating agent charged in the late combustion chamber. Thus, in the present invention, a predetermined gap is formed between at least a portion of the predetermined partition defining the late combustion chamber and the initial combustion chamber housing. Then, even if the initial combustion chamber housing is heated by the combustion heat, the heat insulating function of the air present in the predetermined gap suppresses the situation where the heat of the initial combustion chamber housing is transmitted to a part of the predetermined partition. Ru. In other words, even if a predetermined combustion substance is burned in the initial combustion chamber, the temperature of a part of the predetermined partition becomes difficult to rise. Therefore, the gas generating agent charged in the late combustion chamber becomes less susceptible to the combustion of a predetermined combustion substance in the early combustion chamber. According to such a configuration, it is possible to suppress as much as possible the situation where the gas generating agent filled in the late combustion chamber is ignited at unintended timing. The above-mentioned initial combustion chamber may be a space where combustion of a transfer charge, a gas generating agent, or a transfer charge and a gas generating agent charged as a combustion substance is performed.

  And, in the first aspect of the gas generator of the present invention, the initial combustion chamber is a space in which the charged transfer charge is burned. Specifically, the initial combustion chamber housing may be an igniter housing in which combustion of the transfer charge charged in the housing is performed by the operation of the first igniter. The gas generator according to the first aspect of the present invention is a main combustion chamber in communication with the initial combustion chamber and the gas outlet, and separated from the late combustion chamber by the predetermined partition wall, The fuel cell system further comprises a main combustion chamber in which combustion of the gas generating agent charged in the main combustion chamber is performed by combustion products generated by combustion of the transfer charge, and a part of the predetermined partition and the igniter housing The predetermined gap may be formed therebetween.

  In such a gas generator, when gas generation is required, the first igniter is first activated, and the transfer charge in the igniter housing is burned by the operation of the first igniter. Then, a combustion product generated by the combustion of the transfer charge flows into the main combustion chamber, and the combustion product burns a gas generating agent (hereinafter referred to as a first gas generating agent) charged in the main combustion chamber. . Then, the combustion product generated by the combustion of the transfer charge and the combustion gas generated by the combustion of the first gas generating agent are discharged from the gas outlet.

  As described above, in the gas generator in which the first gas generating agent is burned by the combustion product generated by the combustion of the transfer charge, the space (initial combustion chamber) in the igniter housing in which the transfer charge is burned is relatively high temperature. Become. Along with this, the igniter housing also becomes relatively hot. Thus, in the present invention, a predetermined gap is formed between at least a portion of the predetermined partition defining the late combustion chamber and the initial combustion chamber housing. Then, the transfer of heat from the relatively high temperature igniter housing to a part of the predetermined partition is suppressed by the heat insulating function of the air present in the predetermined gap. This will be described in detail below.

  In the gas generator, the case where only the above-described first igniter is provided, ie, the case where the igniter for directly burning the gas generating agent charged in the late combustion chamber (hereinafter referred to as a second gas generating agent) is not provided In addition, the combustion characteristics of the second gas generating agent are strongly affected by the heat transfer of the combustion heat from the main combustion chamber.

  For example, when the amount of heat transfer from the main combustion chamber to the late combustion chamber is relatively small, the second gas generating agent tends not to ignite. That is, in this case, the gas generated by the combustion of the first gas generating agent is discharged from the gas outlet. Here, in the case where the gas generator is configured such that only the first gas generating agent is burned and the combustion gas is released in such an aspect that the second gas generating agent is not accompanied by ignition and combustion, temporarily, When heat is transferred from the relatively high temperature igniter housing to a part of the predetermined partition wall, the second gas generating agent filled in the late combustion chamber may unintentionally ignite. Therefore, in the gas generator of the present invention, as described above, a predetermined gap is formed. Thus, it is possible to suppress as much as possible the situation in which the second gas generating agent charged in the late combustion chamber is unintentionally ignited.

  On the other hand, when the amount of heat transfer from the main combustion chamber to the late combustion chamber is relatively large, the second gas generating agent tends to be ignited after a predetermined delay time has elapsed since the first gas generating agent was burned. . That is, in this case, first, the gas generated by the combustion of the first gas generating agent is discharged from the gas outlet, and then the gas generated by the combustion of the second gas generating agent is discharged from the gas outlet It will be Here, in the case where the gas generator is configured to release the combustion gas in such a manner that the gas generating agent is burned by such multistage ignition, the above-mentioned predetermined from the igniter housing which has become relatively high temperature temporarily If heat is transferred to a part of the partition wall of the second combustion chamber, the second gas generating agent charged in the late combustion chamber may ignite earlier than the intended timing. Therefore, in the gas generator of the present invention, as described above, a predetermined gap is formed. Accordingly, it is possible to suppress as much as possible the situation in which the second gas generating agent charged in the late combustion chamber is ignited at unintended timing. Therefore, it becomes easy to control the ignition timing of the second gas generating agent.

  In such a gas generator, the igniter housing is surrounded by the main combustion chamber so as to face the main combustion chamber, and the predetermined gap is one of the predetermined partition walls in the main combustion chamber. The predetermined narrow space formed between the part and the igniter housing may be a predetermined narrow space having a size that prevents the gas generating agent from entering the space. According to such a configuration, combustion of the gas generating agent is not performed in the above-described predetermined narrow space (predetermined space) in the main combustion chamber. The transfer of heat to a part of the partition is suitably suppressed.

Here, the predetermined partition wall may have a first communication portion configured to allow gas to flow from the late combustion chamber to the predetermined narrow space. For example, when the second gas generating agent is burned by heat transfer of combustion heat from the main combustion chamber without providing the igniter for directly burning the second gas generating agent, the second gas generating agent is First, by heat transfer from another portion (second wall portion) of the predetermined partition wall different from the portion (first wall portion) of the predetermined partition wall forming the narrow space (predetermined space) 2 Burn in the vicinity of the wall. Then, the gas generated by the combustion of the second gas generating agent flows out from the late combustion chamber to the main combustion chamber via the first communication portion. Here, since the first communication portion is configured to allow the gas to flow from the late combustion chamber to the predetermined narrow space, the first communication portion may be provided on the first wall portion. In this case, the combustion gas of the second gas generating agent generated in the vicinity of the second wall flows in the late combustion chamber toward the first communication portion provided in the first wall. Then, the combustion gas is circulated in the late combustion chamber in this manner to promote the combustion of the second gas generating agent in the vicinity of the first wall portion, whereby the second gas generating agent in the late combustion chamber becomes uniform. It becomes easy to be burned. In addition, the first gas generating agent is not filled in the predetermined narrow space (the predetermined gap). Therefore, the combustion gas of the second gas generating agent is easily discharged to a predetermined narrow space (predetermined gap).

  The gas generator according to the first aspect of the present invention is a main combustion chamber wall which divides the space in the outer shell housing up and down, and the main combustion is performed in the upper space of the divided space. A main combustion chamber wall defining a chamber, the predetermined partition, and the rear combustion chamber defined in a part of the lower space of the space in the outer shell housing divided by the main combustion chamber wall And a second igniter for burning the gas generating agent charged in the late combustion chamber. The predetermined gap is formed between a portion of the predetermined partition included in the late combustion chamber housing and the igniter housing, and further, between the late combustion chamber housing and the main combustion chamber wall. Other gaps may be formed in the In such a gas generator, the combustion timing of the gas generating agent (first gas generating agent) charged in the main combustion chamber at the operation timing of the first igniter is the latter combustion chamber at the operation timing of the second igniter. The combustion timing of the filled gas generating agent (second gas generating agent) can be independently controlled.

  And according to the above-mentioned composition, transfer of heat from the igniter housing to a part of the predetermined partition included in the late combustion chamber housing is suppressed by the heat insulation effect of the air present in the predetermined gap. In addition, when the first gas generating agent is burned in the main combustion chamber, the main combustion chamber wall is heated, but in the above configuration, another gap is formed between the late combustion chamber housing and the main combustion chamber wall. Is formed. Therefore, the heat transfer from the main combustion chamber wall to the late combustion chamber housing is suppressed by the heat insulating function of the air present in the other gaps. Thus, it is possible to suppress as much as possible the situation in which the second gas generating agent is ignited at unintended timing. As a result, the combustion timing of the second gas generating agent can be easily controlled by the second igniter (the operation timing of the second igniter).

  Here, another gap may be formed between the bottom of the late combustion chamber housing and the bottom of the shell housing. According to such a configuration, the transfer of heat from the bottom surface of the shell housing to the bottom surface of the late combustion chamber housing is further suppressed by the heat insulating action of air present in the other gap.

  Further, the late combustion chamber housing is provided such that the bottom surface thereof is in contact with the bottom surface of the outer shell housing, and the side surface on the bottom surface is in contact with the side surface of the bottom surface of the outer shell housing The side surface of the housing has an abutting portion which is a portion coming into contact with the side surface on the bottom surface side of the outer shell housing, and an annular portion which is a portion on the top surface side of the abutting portion. It may be formed apart from the side of the shell housing. According to such a configuration, the bottom surface of the late combustion chamber housing abuts on the bottom surface of the shell housing, whereby the vertical direction of the late combustion chamber housing is positioned. Further, the side surface on the bottom side of the late combustion chamber housing abuts the side surface on the bottom side of the shell housing, whereby the lateral direction of the late combustion chamber housing is positioned. And since the air layer is formed between the annular portion and the side surface by forming the annular portion of the late combustion chamber housing away from the side surface of the outer shell housing, the annular portion is formed from the side surface The transfer of heat to the air is suppressed by the thermal insulation of the air layer.

Here, the annular portion extends from the bottom to the top so that the distance between the annular portion and the side of the outer shell housing increases from the bottom to the top of the late combustion chamber housing. It may be inclined.

  Further, in the gas generator according to the first aspect of the present invention, the predetermined partition extends from the igniter housing toward the outer shell housing in the outer shell housing, thereby the outer shell housing A first divided wall that divides a space around the igniter housing into two, wherein the divided main space includes the main combustion chamber, and the other divided space includes the late combustion chamber And a second dividing wall disposed in the other space to divide the space around the igniter housing, the second dividing wall further dividing the other space. It may have a wall. The second divided wall may be a part of the predetermined partition, and the predetermined gap may be formed between the second divided wall and the igniter housing.

  In such a gas generator, in the other space divided by the first dividing wall, a late combustion chamber is formed with respect to the igniter housing with a predetermined gap by the second dividing wall. Therefore, the situation where the gas generating agent charged in the late combustion chamber is ignited at unintended timing can be suppressed as much as possible. Further, in the above gas generator, when the first gas generating agent in the main combustion chamber is burned by the combustion product generated by the combustion of the transfer charge, the heat of combustion is transmitted through the first dividing wall to the latter combustion chamber. It will be transmitted to the second gas generant. When the second gas generating agent is ignited by using the combustion heat thus transmitted, the second gas is prevented from transmitting the heat from the igniter housing to the second divided wall by the predetermined gap. It becomes easy to control the ignition timing of the generating agent.

  In the second aspect of the gas generator of the present invention, the initial combustion chamber is a space where combustion of the filled gas generating agent is performed. Specifically, the initial combustion chamber includes a main combustion chamber in which combustion of the gas generating agent charged in the initial combustion chamber is performed by the operation of the first igniter, and the initial combustion chamber housing includes the main combustion chamber A third dividing wall for dividing a space in an outer shell housing into two, wherein one of the divided spaces includes the initial combustion chamber, and the other divided space includes the late combustion chamber. As such, it may have a third dividing wall which divides the space in the outer shell housing. In the gas generator according to the second aspect of the present invention, a fourth dividing wall forming the predetermined gap between the third dividing wall and the fourth dividing wall as the predetermined dividing wall, and the second combustion chamber filled with the fourth division wall. And a second igniter for burning the gas generating agent. In such an embodiment, the transfer chamber may contain a transfer charge. In this case, the initial combustion chamber is a space in which the gas generating agent and the transfer charge are burned.

  In such a gas generator, in the other space divided by the third dividing wall, a late combustion chamber is formed with respect to the third dividing wall with a predetermined gap of the fourth dividing wall interposed therebetween. become. Therefore, in the one space divided by the third dividing wall, even if the gas generating agent (and transfer agent) charged in the initial combustion chamber is burned and the third dividing wall is heated, The heat insulating action of the existing air suppresses the transfer of the heat of the third dividing wall to the fourth dividing wall. As a result, it is possible to suppress as much as possible the situation where the gas generating agent charged in the late combustion chamber is ignited at unintended timing. As a result, the combustion timing of the gas generating agent charged in the late combustion chamber can be easily controlled by the second igniter (the operation timing of the second igniter).

  According to the present invention, in the dual type gas generator, the situation where the gas generating agent is ignited at unintended timing can be suppressed as much as possible.

It is a figure which shows schematic structure of the gas generator which concerns on Example 1 of this invention. It is a figure which shows schematic structure of the igniter applied to a gas generator. It is a figure for demonstrating the function of a 1st gap | interval. It is a 1st figure for demonstrating the discharge | release form of the combustion gas by the gas generator which concerns on Example 1 of this invention. It is a 2nd figure for demonstrating the discharge | release form of the combustion gas by the gas generator which concerns on Example 1 of this invention. It is a 3rd figure for demonstrating the discharge | release form of the combustion gas by the gas generator which concerns on Example 1 of this invention. It is a figure which shows schematic structure of the gas generator which concerns on Example 2 of this invention. It is a figure which shows schematic structure of the gas generator which concerns on the modification of Example 2 of this invention. It is a figure which shows schematic structure of the gas generator which concerns on Example 3 of this invention. It is a figure which shows schematic structure of the gas generator which concerns on the modification of Example 3 of this invention. It is a figure which shows schematic structure of the gas generator which concerns on Example 4 of this invention.

  Hereinafter, a gas generator according to an embodiment of the present invention will be described with reference to the drawings. In addition, the structure of the following embodiment is an illustration, and this invention is not limited to the structure of these embodiment.

Example 1
FIG. 1 is a cross-sectional view of the gas generator 1 in the height direction. The gas generator 1 is configured to burn the gas generating agent filled in the outer shell housing 4 formed by the upper shell 2 and the lower shell 3 to release the combustion gas. The gas generator 1 is a so-called dual type gas generator in which two combustion chambers are vertically disposed as described later, and a gas generating agent is disposed in each combustion chamber. Here, the upper shell 2 has a peripheral wall portion 2c and a top surface portion 2d, which form a concave internal space. The top surface 2d has a substantially circular shape in a top view together with the bottom surface 3b of the lower shell 3 described later, and the peripheral wall 2c and the peripheral wall 3a of the lower shell 3 described later respectively have the top surface 2d and the bottom surface It encloses the circumference of 3b, and forms an annular wall which extends approximately perpendicularly from each surface. The internal space of the upper shell 2 is a first combustion chamber 21 filled with a first gas generating agent 22 as described later. The top surface 2d is connected to one end of the peripheral wall 2c, and the other end is an opening of the upper shell 2. And the fitting wall 2a and the butting part 2b are provided in the said other end side of the surrounding wall part 2c sequentially from the said opening part. The radius of the internal space by the fitting wall 2a is larger than the radius of the internal space by the peripheral wall 2c near the top surface 2d, and the fitting wall 2a is connected to the peripheral wall 2c via the butting portion 2b ing.

  The lower shell 3 has a peripheral wall 3a and a bottom 3b, which form a concave internal space. The internal space is the second combustion chamber 25 filled with the second gas generating agent 26. The bottom surface 3b is connected to one end of the peripheral wall 3a, and the other end is an opening of the lower shell 3. The radius of the internal space by the peripheral wall 3 a is substantially the same as the radius of the internal space by the peripheral wall 2 c of the upper shell 2. The bottom surface portion 3b of the lower shell 3 is provided with a hole to which an igniter housing 16 accommodating the first igniter 23 is fixed. The detailed description of the first igniter 23 and the igniter housing 16 will be described later.

  Furthermore, in the outer shell housing 4, a partition wall 10 is disposed between the upper shell 2 and the lower shell 3. The partition wall 10 is connected to the end portion 15 and the end portion 15 and divides the inside of the outer shell housing 4 into upper and lower spaces, and connects to the division portion 14 and extends along the igniter housing 16 described later. It has a peripheral portion 13, an end 12 abutted against the bottom surface 3 b of the lower shell 3, and a projection 11 provided on the peripheral portion 13. The partition wall 10 can be attached to the lower shell 3 so that the projection 11 abuts on an igniter housing 16 described later.

Then, with the bulkhead 10 attached on the lower shell 3 in this manner, the upper shell 2 is further attached from above. As described above, since the radius of the internal space by the fitting wall 2 a of the upper shell 2 is larger than the radius of the internal space by the peripheral wall 2 c, the abutment portion 2 b of the upper shell 2 is the partition wall 10 The lower shell 3 is fitted until it abuts on the end portion 15. In the outer shell housing 4, the fitting portion and the contact portion between the upper shell 2 and the lower shell 3 are joined by a bonding method (for example, welding etc.) suitable for preventing moisture etc. of the gas generating agent filled inside. Be done. Further, the partition wall 10 can be positioned also by the abutment of the end portion 15 thereof with the fitting wall portion 2 a of the upper shell 2 regardless of the projection portion 11. Therefore, in the partition 10, the projection part 11 is not an essential structure.

  As described above, in the outer shell housing 4, the inner space is generally divided into two upper and lower spaces by the partition wall 10. A first gas generating agent 22 is disposed in a first combustion chamber 21 defined by the upper shell 2 and the partition 10 in the internal space of the outer shell housing 4, and a second combustion defined by the lower shell 3 and the partition 10 The second gas generating agent 26 is disposed in the chamber 25 so that the gas generator 1 is configured as a dual type gas generator. According to such a gas generator 1, the form of the discharge of the combustion gas to the outside can be variously adjusted by the combustion of the first gas generating agent 22 and the combustion of the second gas generating agent 26.

  Here, in the first combustion chamber 21, an annular filter 32 is disposed so as to surround the first gas generating agent 22. At this time, the first gas generating agent 22 is not filtered by an urging force of a cushion (not shown) (for example, provided on the top surface 2d side in the upper shell 2) so as to prevent unnecessary vibration in the first combustion chamber 21. It is filled in a state where it is pressed down to the partition 10 and the like. The combustion temperature of the first gas generating agent 22 is preferably in the range of 1000 to 1700 ° C. For the first gas generating agent 22, for example, guanidine nitrate (41% by weight), basic copper nitrate (49% by weight) And a binder or an additive, which can be used in the form of a single-hole cylinder.

  The filter 32 is formed by overlapping stainless steel flat braided wire netting in the radial direction and compressing it in the radial and axial directions, cooling the combustion gas by the first gas generating agent 22, and removing the combustion residue Collect. As the filter 32, it is also possible to adopt a winding type structure formed by winding a wire in multiple layers around a mandrel. The filter 32 also collects combustion residues of the second gas generating agent 26 charged in the second combustion chamber 25 and combustion residues of the transfer charge 24 charged in the igniter housing 16 described later. Further, a gas passage 33 is provided between the peripheral wall 2 c of the upper shell 2 and the filter 32. The gas passage 33 is a space formed annularly in a radial cross section around the filter 32. The gas passage 33 allows the combustion gas to pass through the entire area of the filter 32, and the effective use of the filter 32 and the effective cooling and purification of the combustion gas are achieved. The combustion gas flowing through the gas passage 33 reaches the gas outlet 5 provided in the peripheral wall 2c. In addition, before the gas generator 1 is activated, the gas outlet 5 is blocked from the inside of the shell housing 4 by the aluminum tape 34 to prevent moisture from entering the shell housing 4 from the outside. There is.

  The second combustion chamber 25 is filled with a second gas generating agent 26. The second gas generating agent 26 is also charged in a state of being urged by a cushion (not shown) so as to prevent unnecessary vibration in the second combustion chamber 25. Similarly to the first gas generating agent 22, the second gas generating agent 26 also has guanidine nitrate (41% by weight), basic copper nitrate (49% by weight), a binder and additives, and has a single-hole cylindrical shape. Can be used.

In addition, an igniter housing 16 accommodating the first igniter 23 is fixed to a hole provided in the bottom surface portion 3 b of the lower shell 3. The igniter housing 16 is a housing extending from the bottom surface portion 3b of the lower shell 3 to the top surface portion 2d of the upper shell 2, and a space on the lower side (the bottom surface portion 3b side of the lower shell 3) in the housing. , The first igniter 23 is disposed. Then, the upper side of the first igniter 23 in the igniter housing 16 (the top surface portion 2 of the upper shell 2
The transfer charge 24 is filled in the space d). In addition, as the transfer charge 24, a gas generating agent having good ignition property and having a combustion temperature higher than that of the first gas generating agent 22 and the second gas generating agent 26 can be used. The combustion temperature of the transfer charge 24 is preferably in the range of 1700 to 3000 ° C. As such a charge transfer agent 24, for example, one comprising nitroguanidine (34% by weight) and strontium nitrate (56% by weight) can be used. And the communication hole 16a mentioned later provided in the igniter housing 16 is closed with the aluminum tape not shown, and the mixture of the transfer charge 24 and the 1st gas generating agent 22 is prevented.

  Here, the igniter applied to the gas generator 1 will be described based on FIG. 2 with the first igniter 23 as an example. The first igniter 23 is an electric igniter. In the first igniter 23, a space for placing the igniter 232 is defined in the cup 231 by the cup 231 whose surface is covered with the insulating cover. And the metal header 233 is arrange | positioned in the space, and the cylindrical charge holder 234 is provided in the upper surface. The charge holder 234 holds the ignition charge 232. At the bottom of the igniter 232, a bridge wire 235 electrically connecting one of the conductive pins 237 and the metal header 233 is wired. The two conductive pins 237 are fixed to the metal header 233 via the insulator 236 so that they are in an insulated state when no voltage is applied. Furthermore, the two conductive pins 237 supported by the insulator 236 are protected by the resin collar 238 in a state where the insulation between the conductive pins 237 is well maintained.

  In the first igniter 23 thus configured, when a voltage is applied between the two conductive pins 237 by the external power supply, a current flows in the bridge wire 235, whereby the igniter 232 is burned. At this time, a combustion product of the ignition agent 232 combustion is ejected from the opening of the charge holder 234. Then, the transfer charge 24 in the igniter housing 16 is burned by the combustion product of the igniter 232 ejected from the first igniter 23 in this manner.

  Here, as the igniter 232, preferably, a pyrotechnic charge containing zirconium and potassium perchlorate (ZPP), a pyrotechnic charge containing titanium hydride and potassium perchlorate (THPP), a pyrotechnic charge containing titanium and potassium perchlorate (TiPP) ), Explosives containing aluminum and potassium perchlorate (APP), explosives containing aluminum and bismuth oxide (ABO), explosives containing aluminum and molybdenum oxide (AMO), explosives containing aluminum and copper oxide (ACO), aluminum and An explosive comprising iron oxide (AFO) or a combination of several of these explosives may be mentioned. These explosives generate high-temperature and high-pressure plasma at the time of combustion immediately after ignition, but when the temperature reaches normal temperature and the combustible organisms condense, the generated pressure does not contain a gas component, and the generated pressure is rapidly reduced. In addition, you may use explosives other than these as the ignition charge 232. FIG.

  Then, in the gas generator 1 described above, when the first igniter 23 is activated, the transfer charge 24 is burned and a relatively high temperature combustion product is generated in the igniter housing 16. Then, the combustion product flows out into the first combustion chamber 21 through the communication hole 16 a provided in the igniter housing 16, whereby the first gas generating agent 22 is burned. That is, in the gas generator 1 according to the present embodiment, the combustion timing of the first gas generating agent 22 is controlled by the operation timing of the first igniter 23.

Here, in the dual type gas generator, the first gas generating agent and the second gas generating agent are ignited at different ignition timings, that is, the gas generating agent is burned by so-called multistage ignition, whereby the combustion gas is released to the outside. Can be adjusted in various ways. In the gas generator 1 according to the present embodiment, first, the first gas generating agent 22 is ignited and burned, and after a predetermined delay time has elapsed, the second gas generating agent 26 is ignited and burned to the outside. The form of the emission of combustion gases can be adjusted in various ways. However, in the present embodiment, there is no intention to limit to this, and for the discharge form of the combustion gas by the gas generator 1, for example, only the first gas generating agent 22 is burned, and the ignition / combustion of the second gas generating agent 26 It may be a release form of combustion gas according to an aspect that does not involve. In FIG. 1, only the first igniter 23 is used, and the second gas generating agent 26 is necessarily ignited and burned after the first gas generating agent 22 is ignited and burned.

  As described above, when combustion gas is released from the gas generator 1 in a mode in which the second gas generating agent 26 is delayed or ignited, the combustion agent 24 is generated by combustion. The products of combustion may affect the ignition of the second gas generant 26. Specifically, when the transfer charge 24 is burned, relatively high temperature combustion products are generated, so the inside of the igniter housing 16 becomes relatively high temperature. Along with that, the igniter housing 16 itself becomes relatively hot. Then, the second gas generating agent 26 may be ignited at an unintended timing due to heat transfer from the igniter housing 16. Then, if the second gas generating agent 26 is unintentionally ignited, the combustion gas can not be generated as designed.

  Therefore, in the gas generator 1 of the present invention, the first gap 17 is formed between the peripheral portion 13 of the partition wall 10 and the igniter housing 16. The first gap 17 will be described in detail below.

  The first gap 17 is a space of the first combustion chamber 21 between the peripheral portion 13 extending along the igniter housing 16 and the igniter housing 16, and an air layer is formed in the first gap 17 Be done. Here, as shown in FIG. 3, when the transfer charge 24 is burned by the operation of the first igniter 23, the combustion product flows out to the first combustion chamber 21 via the communication hole 16a (this is Represented by arrow C1 in FIG. At this time, even if the igniter housing 16 is heated by the combustion product generated by the combustion of the transfer charge 24, the heat of the igniter housing 16 is transferred to the circumferential portion 13 by the heat insulating function of the air present in the first gap 17. The transmission situation is suppressed (this is represented by the "x" mark in FIG. 3). In other words, even if the transfer charge 24 is burned, the temperature of the partition wall 10 hardly rises. According to such a configuration, it is possible to suppress as much as possible the situation where the second gas generating agent 26 is ignited at an unintended timing.

  The first gap 17 may be a narrow space having a size such that the first gas generating agent 22 does not enter the space. Alternatively, means for preventing the first gas generating agent 22 from invading the first gap 17 (for example, arranging a wire mesh at the inlet of the first gap 17 or igniter the projection extending toward the first gap 17 The housing 16 or the partition 10 may be provided. In the gas generator 1 according to the present embodiment, the first gap 17 is such a narrow space, and the communication hole 13a communicating the second combustion chamber 25 with the first gap 17 is formed in the circumferential portion 13 ing. Here, a blocking member 35 covering the hole is attached to the communication hole 13a from the first combustion chamber 21 side. Thereby, the situation where the combustion gas by the first gas generating agent 22 burned in the space excluding the first gap 17 in the first combustion chamber 21 flows into the second combustion chamber 25 is suppressed. On the other hand, when the second gas generating agent 26 is burned in the second combustion chamber 25, the closing member 35 is detached from the peripheral portion 13 by the pressure of the generated combustion gas, whereby the second combustion is performed via the communication hole 13a. The combustion gas is allowed to flow from the chamber 25 to the first gap 17 (first combustion chamber 21). However, in the present embodiment, there is no intention to limit the first gap 17 to a narrow space, and the first gap 17 is formed between the peripheral portion 13 of the partition 10 and the igniter housing 16. Just do it.

  The discharge form of the combustion gas by the gas generator 1 described above will be described based on FIGS. 4A to 4C. In the gas generator 1 described below, the first gap 17 is a narrow space as described above.

In the gas generator 1 according to the present embodiment, first, the transfer charge 24 is burned by the operation of the first igniter 23. Then, as represented by arrow C1 in FIG. 4A, the combustion product generated by the combustion of the transfer charge 24 flows out into the first combustion chamber 21 through the communication hole 16a formed in the igniter housing 16. At this time, as shown in FIG. 3 described above, the heat insulating action of the air present in the first gap 17 suppresses the transfer of the heat of the igniter housing 16 to the peripheral portion 13 of the partition wall 10.

  Then, when the above-mentioned combustion product flows into the first combustion chamber 21, the first gas generating agent 22 is burned by the combustion product, and combustion gas is generated in the first combustion chamber 21. The combustion gas (and the combustion product of the transfer charge 24) thus generated flows through the filter 32 and flows into the gas passage 33, and finally, as represented by the arrow C2 in FIG. 4B, the gas outlet The gas is released to the outside of the gas generator 1 from 5. Here, when the first gas generating agent 22 is burned in the first combustion chamber 21, the partition 10 is heated, but in this embodiment, the first gas generation to be burned in the first gap 17 is generated. Since the agent 22 does not exist, the dividing portion 10 of the partition 10 is mainly heated. Then, the heat due to the combustion of the first gas generating agent 22 is transmitted to the second gas generating agent 26 in the vicinity of the dividing portion 14 in the second combustion chamber 25 via the dividing portion 14.

  As a result, in the second combustion chamber 25, first, the second gas generating agent 26 in the vicinity of the dividing portion 14 is burned. Then, the combustion gas generated by this combustion flows in the second combustion chamber 25 toward the communication holes 13a provided in the circumferential portion 13 of the partition 10, as represented by the arrow C3 in FIG. 4C. It flows out to the first combustion chamber 21 from the communication hole 13a. At this time, since the combustion of the second gas generating agent in the vicinity of the peripheral portion 13 is promoted by the flow of the combustion gas described above, the second gas generating agent 26 in the second combustion chamber 25 is easily combusted uniformly.

  Then, the combustion gas that is generated by the combustion of the second gas generating agent 26 and flows into the first combustion chamber 21 flows through the filter 32 and the gas passage 33 and is final as represented by the arrow C4 in FIG. 4C. It is discharged from the gas outlet 5 to the outside of the gas generator 1. As described above, the delayed ignition of the second gas generating agent 26 adjusts the form of the release of the combustion gas to the outside.

  According to the gas generator 1 of the present invention described above, it is possible to suppress as much as possible the situation where the second gas generating agent 26 is ignited at unintended timing due to the combustion of the transfer charge 24. As a result, the combustion gas can be generated as designed.

Example 2
Next, a second embodiment of the present invention will be described based on FIG. In the present embodiment, the detailed description of the configuration substantially the same as that of the first embodiment described above is omitted. FIG. 5 is a sectional view in the height direction of the gas generator 1A according to the present embodiment.

  As shown in FIG. 5, a first combustion chamber wall 40 is disposed between the upper shell 2 and the lower shell 3 in the outer shell housing 4 of the gas generator 1A according to the present embodiment. The first combustion chamber wall 40 has a first end 41 which is one end of the wall member, a second end 42 which is the other end, and a first end 41 and a second end 42. It has the division part 43 which divides | segments the inside of the connection outer shell housing 4 into the upper and lower space substantially. The first combustion chamber wall 40 can be attached to the lower shell 3 such that its second end 42 abuts the igniter housing 16.

The second combustion chamber housing 50 is disposed in the lower space of the space in the outer shell housing 4 divided by the first combustion chamber wall 40. The second combustion chamber housing 50 has a housing portion 51, a top plate portion 52, and a projection portion 53. The housing portion 51 forms a concave internal space by the peripheral wall and the bottom wall thereof, and the top plate portion 52 is attached to the opening of the housing portion 51. Also, a projection 53 is formed on the bottom wall of the housing 51. Then, the second gas generating agent 26 is disposed in a space in the second combustion chamber housing 50 surrounded by the housing portion 51 and the top plate portion 52. A plurality of communicating holes of a size that does not allow the second gas generating agent 26 to pass through is formed in the top plate portion 52, and when the second gas generating agent 26 is burned, the combustion gas passes through the communicating holes. It flows out of the second combustion chamber housing 50 via the second combustion chamber housing 50. Furthermore, in the second combustion chamber housing 50, a second igniter 27 is accommodated. The second igniter 27 is fixed to a hole provided on the bottom surface 3 b of the lower shell 3.

  Such a second combustion chamber housing 50 is disposed in the lower shell 3 such that a second gap 18 is formed between the second combustion chamber housing 50 and the first combustion chamber wall 40. In the present embodiment, the second combustion chamber housing 50 is disposed in the lower shell 3 such that the projection 53 of the second combustion chamber housing 50 abuts on the bottom surface 3 b of the lower shell 3. The first combustion chamber wall 40 is attached to the lower shell 3 so as to close the opening of the lower shell 3 in which the second combustion chamber housing 50 is disposed. At this time, the cushion 60 is disposed so as to be sandwiched between the top plate portion 52 of the second combustion chamber housing 50 and the divided portion 43 of the first combustion chamber wall 40, thereby the second combustion chamber housing 50. May be fixed between the first combustion chamber wall 40 and the bottom portion 3 b of the lower shell 3.

  Here, the cushion 60 is an elastic member having a predetermined thickness, and for example, an elastic member having a function as a heat insulating material such as a ceramic fiber can also be used. Then, by providing such a cushion 60 between the top plate portion 52 of the second combustion chamber housing 50 and the divided portion 43 of the first combustion chamber wall 40, the second combustion chamber housing 50 and the first A second gap 18 is formed between the combustion chamber wall 40.

  Then, with the second combustion chamber housing 50 and the first combustion chamber wall 40 attached on the lower shell 3 as described above, the upper shell 2 is further attached from above. The upper shell 2 is fitted on the lower shell 3 until the abutment 2 b is abutted against the first end 41 of the first combustion chamber wall 40. Then, the first combustion chamber wall 40 is fixed in the outer shell housing 4, thereby maintaining the fixed state of the second combustion chamber housing 50 between the first combustion chamber wall 40 and the bottom portion 3 b of the lower shell 3. Be done. At this time, since the second combustion chamber housing 50 is fixed in the outer shell housing 4 so that the projection 53 abuts on the bottom surface portion 3b of the lower shell 3, as shown in FIG. A third gap 19 is formed between the chamber housing 50 and the lower shell 3.

  Here, the first combustion chamber 21 is formed in the upper space of the space in the outer shell housing 4 which is divided into the two spaces generally vertically by the first combustion chamber wall 40. On the other hand, a second combustion chamber housing 50 is disposed in the lower space, and the second combustion chamber 25 is defined by the second combustion chamber housing 50.

  The second igniter 27 housed in the second combustion chamber housing 50 is configured in the same manner as the first igniter 23, the details of which are as described in the description of FIG. 2 above. Then, the second gas generating agent 26 in the second combustion chamber 25 is burned by the combustion product of the igniter ejected from the second igniter 27. Note that the transfer charge 24 may be disposed in the second combustion chamber 25. In this case, the transfer charge 24 is burned by the combustion product of the igniter ejected from the second igniter 27, and the transfer charge 24 is burned. The product may burn the second gas generant 26.

  In such a gas generator 1A, the combustion timing of the first gas generating agent 22 is controlled by the operation timing of the first igniter 23, and the combustion timing of the second gas generating agent 26 by the operation timing of the second igniter 27 is It can be controlled. In the present embodiment, there is no intention to limit the invention to the mode in which the first gas generating agent 22 and the second gas generating agent 26 are burned, and only the first gas generating agent 22 is burned by the operation of the first igniter 23. It may be an aspect.

Here, the discharge mode of the combustion gas by the gas generator 1A according to the present embodiment will be briefly described below. In the following description, an embodiment in which the first gas generating agent 22 and the second gas generating agent 26 are burned will be described as an example.

  In the gas generator 1A according to the present embodiment, the transfer charge 24 filled in the igniter housing 16 is burned by the operation of the first igniter 23. Then, the combustion product of the transfer charge 24 flows into the first combustion chamber 21, and the first gas generating agent 22 is burned by the combustion product. Then, the combustion gas generated by the combustion of the first gas generating agent 22 flows through the filter 32 and the gas passage 33 and finally flows out from the gas discharge port 5, whereby the combustion gas is released from the gas generator 1A. Ru.

  On the other hand, the second gas generating agent 26 is burned by the operation of the second igniter 27 as described above. Then, the combustion gas generated by the combustion of the second gas generating agent 26 flows out of the second combustion chamber housing 50 through the communication hole provided in the top plate portion 52 of the second combustion chamber housing 50. Then, the combustion gas flows out to the first combustion chamber 21 through the communication hole 43 a provided in the divided portion 43 of the first combustion chamber wall 40. Then, the combustion gas flows through the filter 32 and the gas passage 33 and finally flows out from the gas outlet 5, whereby the combustion gas is released from the gas generator 1A. A closing member 36 covering the hole is attached to the communication hole 43a from the first combustion chamber 21 side, and the pressure of the combustion gas of the second gas generating agent 26 separates the closing member 36 from the divided portion 43 Thus, the combustion gas is caused to flow into the first combustion chamber 21 through the communication hole 43a.

  As described above, the gas generator 1A according to the present embodiment adjusts the operation timings of the first igniter 23 and the second igniter 27 arbitrarily to variously adjust the form of emission of combustion gas to the outside. It is However, if the gas generating agent is ignited regardless of the operation of the igniter, there is a possibility that the combustion gas can not be generated as designed.

  Therefore, in the gas generator 1A according to the present embodiment, a first gap 17 'is formed between the housing portion 51 of the second combustion chamber housing 50 and the igniter housing 16. Thereby, the situation where the heat of the igniter housing 16 is transmitted to the housing portion 51 is suppressed. Furthermore, in the gas generator 1A, a second gap 18 and a third gap 19 are formed around the second combustion chamber housing 50. Thereby, the situation where the heat of the first combustion chamber wall 40 or the lower shell 3 is transferred to the second combustion chamber housing 50 is suppressed.

  According to the gas generator 1A described above, the second gas generating agent 26 can be prevented from being ignited at unintended timing as much as possible, thereby generating the combustion gas as designed. It becomes possible.

Modification of Example 2
Next, a modification of the second embodiment described above will be described based on FIG. In the present modification, the detailed description of the configuration substantially the same as that of the second embodiment described above is omitted. FIG. 6 is a cross-sectional view in the height direction of the gas generator 1A according to the present modification.

  As shown in FIG. 6, in the gas generator 1A according to the present modification, the second combustion chamber housing 50 is in contact with the bottom 3b of the lower shell 3 so that the bottom of the second combustion chamber housing 50 abuts on the lower shell 3. Placed inside. Further, the second combustion chamber housing 50 has a lower portion so that the side surface (hereinafter referred to as an abutting portion) 54 on the bottom surface side of the housing portion 51 of the second combustion chamber housing 50 abuts on the side surface 3 c on the bottom surface side of the lower shell 3 It is placed in the shell 3. In the gas generator 1A according to the present modification, the second combustion chamber housing 50 is fixed in the outer shell housing 4 by arranging the second combustion chamber housing 50 in the lower shell 3 in this manner.

Here, in the gas generator 1A shown in FIG. 6, similarly to the gas generator 1A shown in FIG. 5 described above, the top plate portion 52 of the second combustion chamber housing 50 and the divided portion of the first combustion chamber wall 40 Although the cushion 60 is provided between it and 43, in the present variation in which the second combustion chamber housing 50 is fixed as described above, the cushion 60 may not be disposed. However, the second gap 18 is formed between the second combustion chamber housing 50 and the first combustion chamber wall 40, as in the gas generator 1A shown in FIG. 5 described above.

  Further, the housing portion 51 of the second combustion chamber housing 50 has an annular portion 55 extending from the contact portion 54 to the top plate 52 side on the side surface thereof. An annular portion 55 is formed separately from the peripheral wall portion 3 a of the lower shell 3. Specifically, in the annular portion 55, the distance from the peripheral wall 3a of the lower shell 3 increases from the bottom to the top in the second combustion chamber housing 50, from the bottom to the top It is inclined towards. As a result, as shown in FIG. 6, a third gap 19 is formed between the second combustion chamber housing 50 and the peripheral wall portion 3 a of the lower shell 3.

  In the gas generator 1A according to the present modification, the first gap 17 'is formed between the housing portion 51 of the second combustion chamber housing 50 and the igniter housing 16 so that the heat of the igniter housing 16 is the housing. The situation of transmission to the unit 51 is suppressed. Furthermore, the second gap 18 is formed between the second combustion chamber housing 50 and the first combustion chamber wall 40, so that the heat of the first combustion chamber wall 40 is transferred to the second combustion chamber housing 50. Be suppressed.

  Also by the gas generator 1A described above, it is possible to suppress as much as possible the situation where the second gas generating agent 26 is ignited at unintended timing, thereby generating the combustion gas as designed. Is possible.

Example 3
Next, a third embodiment of the present invention will be described based on FIG. In the present embodiment, the detailed description of the configuration substantially the same as that of the first embodiment described above is omitted. FIG. 7 is a cross-sectional view of a gas generator 1B according to the present embodiment.

  As shown in FIG. 7, the gas generator 1B according to the present embodiment is configured to burn the gas generating agent filled in the round outer shell housing 4 'and release the combustion gas. . The gas generator 1B is a dual type gas generator in which two combustion chambers are arranged side by side in the circumferential direction as described later, and a gas generating agent is arranged in each combustion chamber.

  An igniter housing 16 accommodating the first igniter 23 is disposed substantially at the center of the outer shell housing 4 ′. Then, the transfer charge 24 is filled in the igniter housing 16, and the transfer charge 24 is burned by the operation of the first igniter 23. A communication hole 16 a is formed in the igniter housing 16, and a combustion product generated by the combustion of the transfer charge 24 spreads in the space around the igniter housing 16 through the communication hole 16 a.

Here, the space around the igniter housing 16 includes a combustion chamber filled with a gas generating agent, an annular filter 32 disposed so as to surround the combustion chamber, and the filter 32 and the outer shell housing 4 '. A gas passage 33 is formed between the two. This will be described in detail below. The gas generator 1B according to the present embodiment includes a first dividing wall 100 that divides the space around the igniter housing 16 by extending from the igniter housing 16 toward the outer shell housing 4 ′. There is. The first divided wall 100 is connected to a first end 101 abutting on the igniter housing 16, a second end 102 abutting on the filter 32, and the first end 101 and the second end 102, and the igniter housing A dividing portion 103 is provided to divide the space between the filter 16 and the filter 32 in the circumferential direction of the shell housing 4 '. The filter 32 is positioned by the first dividing wall 100. And, by arranging two such first divided walls 100 in the circumferential direction of the outer shell housing 4 ', the space between the igniter housing 16 and the filter 32 is the circumference of the outer shell housing 4'. Divided into two in the direction. Then, one of the divided spaces contains the first combustion chamber 21 filled with the first gas generating agent 22, and the other divided space is filled with the second gas generating agent 26. A combustion chamber 25 is included.

  The first combustion chamber 21 is defined by the igniter housing 16, the first dividing wall 100, and the filter 32. The communication hole 16 a of the igniter housing 16 is configured to allow the space in the igniter housing 16 to communicate with the first combustion chamber 21. Therefore, when the first igniter 23 operates, the combustion product generated by the combustion of the transfer charge 24 flows into the first combustion chamber 21 and the first gas generating agent 22 is burned by the combustion product. Then, the combustion gas generated by the combustion of the first gas generating agent 22 flows through the filter 32 and the gas passage 33 and flows out from the gas discharge port 5 formed in the outer shell housing 4 ′. Here, since the gas passage 33 is annularly formed along the annular filter 32, and the gas outlet 5 is formed in plural in the circumferential direction of the outer shell housing 4 ', the combustion gas is a gas The passage 33 can be circulated in the circumferential direction.

  On the other hand, the second divided wall 200 is further disposed in the other space divided by the first divided wall 100. The second divided wall 200 is disposed such that one end thereof abuts on one of the first divided walls 100 and the other end thereof abuts on the other first divided wall 100. Thereby, a first gap 170 is formed between the second divided wall 200 and the igniter housing 16. The second divided wall 200 has a projection 201 between both ends, and the projection 201 is disposed so as to abut on the igniter housing 16. Thereby, when the 2nd division wall 200 receives external force, the situation where the 2nd division wall 200 changes can be controlled. However, this projection 201 is not an essential component.

  The second combustion chamber 25 is defined by the first dividing wall 100, the second dividing wall 200, and the filter 32. Here, the heat insulating function of the air present in the first gap 170 suppresses the transfer of the heat of the igniter housing 16 to the second divided wall 200, so the second gas generating agent 26 is the first divided wall It will be burned by the heat by combustion of the 1st gas generant 22 transmitted via 100. Then, the combustion gas generated by the combustion of the second gas generating agent 26 flows through the filter 32 and the gas passage 33 and flows out from the gas outlet 5. However, in the present embodiment, only the first gas generating agent 22 may be burned, and the combustion gas may be released from the gas generator 1B in such an aspect that the second gas generating agent 26 is not involved in ignition and combustion.

  Also with such a configuration, it is possible to suppress as much as possible the situation where the second gas generating agent 26 is ignited at an unintended timing. Therefore, the combustion gas can be generated as designed.

<Modification of Embodiment 3>
Next, a modification of the third embodiment described above will be described based on FIG. In the present modification, the detailed description of the configuration substantially the same as that of the third embodiment described above will be omitted. FIG. 8 is a cross-sectional view of a gas generator 1B according to the present modification.

  A gas generator 1B according to the present modification is different from the gas generator 1B according to the third embodiment shown in FIG. 7 in that a communicating hole 103a is formed in the divided portion 103 of the first divided wall 100. Only As shown in FIG. 8, the communication hole 103 a is configured to allow the first combustion chamber 21 and the second combustion chamber 25 to communicate with each other. And according to such a communicating hole 103a, it is possible to guide the combustion gas generated by the combustion of the first gas generating agent 22 to the second combustion chamber 25, and using the combustion gas, the second gas generating agent 26 can be It can be burned.

  In this modification, the second gas generating agent 26 is burned after a predetermined delay time has elapsed since the combustion gas of the first gas generating agent 22 is released from the gas generator 1B to the outside, and the combustion gas is released to the outside As a result, the opening area of the communication hole 103a is adjusted. According to such a configuration, the ignition timing of the second gas generating agent 26 can be adjusted by adjusting the opening area of the communication hole 103a, thereby variously adjusting the form of the discharge of the combustion gas to the outside. it can. The opening area of the communication hole 103a at this time is made relatively small. In addition, means for controlling the combustion gas passing through the communication hole 103a (for example, a screen such as an aluminum tape or a wire mesh) may be disposed to cover the communication hole 103a.

  The second gas generating agent 26 can also be delayed and ignited by filling the communication hole 103a having a relatively large opening area with a thermoplastic resin or the like. In this case, the first combustion chamber 21 and the second combustion chamber 25 are melted until the thermoplastic resin or the like filling the communication hole 103 a and closing the communication hole 103 a is melted by the heat of the first gas generating agent 22. Can not communicate. Therefore, the second gas generating agent 26 can be delayed and ignited.

  Further, as described in the description of the third embodiment, since the combustion gas can flow in the gas passage 33 in the circumferential direction, the combustion gas of the first gas generating agent 22 can be supplied through the gas passage 33. 2 can flow into the combustion chamber 25; Therefore, the second gas generating agent 26 may be delayed and ignited using the combustion gas of the first gas generating agent 22 which has flowed into the second combustion chamber 25 through the gas passage 33 regardless of the communication hole 103 a described above. it can.

Example 4
Next, a fourth embodiment of the present invention will be described based on FIG. In the present embodiment, the detailed description of the configuration substantially the same as that of the third embodiment described above is omitted. FIG. 9 is a cross-sectional view of a gas generator 1C according to the present embodiment.

  As shown in FIG. 9, the gas generator 1C according to the present embodiment is the same as the gas generator 1B shown in FIG. 7 described above, except that the gas generator filled in the round outer shell housing 4 'is used. The combustion is configured to release the combustion gas. The gas generator 1C is a dual type gas generator in which two combustion chambers are disposed on the left and right as described later, and a gas generating agent is disposed in each combustion chamber.

  In the shell housing 4 ', a third dividing wall 300 is disposed which divides the space in the shell housing 4' into two. The third divided wall 300 divides the space surrounded by the filter 32 in the outer shell housing 4 ′ into right and left by being disposed so that both ends thereof abut on the inner peripheral surface of the annular filter 32. Then, one of the divided spaces includes the first combustion chamber 21 filled with the first gas generating agent 22 and the first igniter 23 for burning the first gas generating agent 22, and the other divided The second combustion chamber 25 filled with the second gas generating agent 26 and the second igniter 27 for burning the second gas generating agent 26 are included in the space of

  The first combustion chamber 21 is defined by the third dividing wall 300 and the filter 32. Further, the first igniter 23 is as described in the description of FIG. 2 above. Then, when the first igniter 23 operates, the first gas generating agent 22 in the first combustion chamber 21 is burned by the combustion product of the ignition charge 232 ejected from the first igniter 23. Then, the combustion gas generated by the combustion of the first gas generating agent 22 flows through the filter 32 and the gas passage 33 and flows out from the gas discharge port 5 formed in the outer shell housing 4 ′. Note that the transfer charge 24 may be disposed in the first combustion chamber 21. In this case, the transfer charge 24 is burned by the combustion product of the ignition charge 232 ejected from the first igniter 23, and the transfer charge 24 is The first gas generating agent 22 may be burned by the combustion product.

  On the other hand, the fourth divided wall 400 is further disposed in the other space divided by the third divided wall 300. The fourth divided wall 400 is disposed such that its both ends abut on the inner circumferential surface of the filter 32. Thus, the first gap 171 is formed between the fourth divided wall 400 and the third divided wall 300. The fourth divided wall 400 has a holding portion 401 between both ends, and the holding portion 401 is arranged to abut on the third divided wall 300 to maintain the first gap 171. It can be done.

  The second combustion chamber 25 is defined by the fourth dividing wall 400 and the filter 32. Further, a second igniter 27 is disposed in the second combustion chamber 25. Here, the heat insulating function of the air present in the first gap 171 suppresses the transfer of the heat of the third divided wall 300 to the fourth divided wall 400, so the second gas generating agent 26 performs the second ignition. It will be burned by the operation of vessel 27. Then, the combustion gas generated by the combustion of the second gas generating agent 26 flows through the filter 32 and the gas passage 33 and flows out from the gas outlet 5.

  Also with such a configuration, it is possible to suppress as much as possible the situation where the second gas generating agent 26 is ignited at an unintended timing. And according to such a configuration, only the first gas generating agent 22 is burned, and the discharge form of the combustion gas according to an aspect not involving the ignition and combustion of the second gas generating agent 26, or the second igniter 27. It is possible to preferably realize the discharge form of the combustion gas according to an aspect in which the operation timing of is delayed from the operation timing of the first igniter 23, and the second gas generating agent 26 is delayed and ignited. That is, the combustion gas can be generated as designed.

1, 1A, 1B, 1C: gas generator 2: upper shell 3: lower shell 4, 4 ': outer shell housing 5: gas outlet 10: partition 13: peripheral portion 14: divided portion 16: igniter housing 17, 17 ', 170, 171: first gap 18: second gap 19: third gap 21: first combustion chamber 22: first gas generating agent 23: first igniter 24: transfer charge 25: second combustion chamber 26 : Second gas generating agent 27: second igniter 32: filter 33: gas passage 40: first combustion chamber wall 50: second combustion chamber housing 60: cushion 100: first divided wall 200: second divided wall 300: Third divided wall 400: Fourth divided wall

Claims (10)

A first igniter,
An initial combustion chamber housing for accommodating the first igniter, wherein the operation of the first igniter forms an initial combustion chamber in which combustion of a predetermined combustion substance charged in the initial combustion chamber housing is performed. Initial combustion chamber housing,
An outer shell housing containing the initial combustion chamber housing and forming a gas outlet;
In a gas generator comprising
The outer shell housing is a late combustion chamber defined therein by a predetermined partition, and the combustion of the gas generating agent charged in the late combustion chamber corresponds to that of the predetermined combustion substance in the initial combustion chamber. Has a late combustion chamber, which takes place after the combustion,
A predetermined gap is formed between at least a portion of the predetermined partition and the initial combustion chamber housing.
Gas generator. The initial combustion chamber housing is an igniter housing in which combustion of the transfer charge charged in the housing is performed by the operation of the first igniter,
The gas generator is a main combustion chamber which is in communication with the initial combustion chamber and the gas outlet, and is separated from the late combustion chamber by the predetermined partition, and is generated by combustion of the transfer charge. Further comprising a main combustion chamber where combustion of the gas generating agent charged in the main combustion chamber is performed by
The predetermined gap is formed between a portion of the predetermined partition and the igniter housing.
The gas generator according to claim 1. The igniter housing is surrounded by the main combustion chamber to face the main combustion chamber;
The predetermined gap is a predetermined narrow space formed between a portion of the predetermined partition and the igniter housing in the main combustion chamber, and has a size that prevents the gas generating agent from entering the space. Characterized by a predetermined narrow space,
The gas generator according to claim 2. The predetermined partition has a first communication portion configured to allow gas to flow from the late combustion chamber to the predetermined narrow space,
The gas generator according to claim 3. A main combustion chamber wall dividing the space in the outer shell housing up and down, and defining the main combustion chamber in the upper space of the divided spaces;
A late combustion chamber housing that includes the predetermined partition, and which defines the late combustion chamber in a part of the lower space of the space in the outer shell housing divided by the main combustion chamber wall;
And a second igniter for burning the gas generating agent charged in the late combustion chamber.
The predetermined gap is formed between a part of the predetermined partition included in the late combustion chamber housing and the igniter housing, and the space between the late combustion chamber housing and the main combustion chamber wall is further formed. A gap is formed,
The gas generator according to claim 2. Another further gap is formed between the bottom of the late combustion chamber housing and the bottom of the shell housing,
The gas generator according to claim 5. The late combustion chamber housing is provided such that the bottom surface thereof is in contact with the bottom surface of the shell housing, and the side surface on the bottom surface is in contact with the side surface on the bottom surface of the shell housing.
The side surface of the late combustion chamber housing has an abutting portion which is a portion abutting on the side surface on the bottom surface side of the outer shell housing, and an annular portion which is a portion on the top surface side than the abutting portion. A portion is formed spaced from the side surface of the shell housing,
The gas generator according to claim 5. The annular portion is inclined from the bottom to the top so that the distance between the annular portion and the side of the shell housing increases from the bottom to the top of the rear combustion chamber housing.
The gas generator according to claim 7. The predetermined partition wall is
A first dividing wall which divides the space around the igniter housing in the outer shell housing into two by extending from the igniter housing toward the outer shell housing in the outer shell housing. And a first dividing wall for dividing the space around the igniter housing such that the divided space includes the main combustion chamber and the divided space includes the late combustion chamber. ,
And a second dividing wall disposed in the other space, the second dividing wall further dividing the other space,
The second dividing wall is a part of the predetermined dividing wall, and the predetermined gap is formed between the second dividing wall and the igniter housing.
The gas generator according to claim 2. The initial combustion chamber includes a main combustion chamber in which the gas generating agent charged in the initial combustion chamber is burned by the operation of the first igniter,
The initial combustion chamber housing is a third divided wall that divides the space in the outer shell housing into two, the divided initial space includes the initial combustion chamber, and the other divided space And a third dividing wall that divides the space in the outer shell housing so that the later combustion chamber is included in
The gas generator is
A fourth divided wall forming the predetermined gap between the third dividing wall and the predetermined dividing wall;
A second igniter for burning the gas generating agent charged in the late combustion chamber;
Further comprising
The gas generator according to claim 1.

Images