JP2022007740A - Gas generator - Google Patents

Abstract

To provide a technology that can inhibit occurrence of a short path in a gas generator.SOLUTION: In a gas generator, a peripheral wall part has a deformation part which is formed at a position located at a predetermined height from a second wall part on a periphery of the peripheral wall part and deformed by a pressure increased in a combustion chamber by actuation of an ignition part in a manner that the height of the peripheral wall part increases. A filter is disposed in a housing so that its one end contacts with a first wall part and the other end is located at the first wall part side with respect to the deformation part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a gas generator.

Conventionally, a gas generator in which an igniter and a gas generator are arranged in a housing, the gas generator is burned by operating the igniter, and the combustion gas is discharged to the outside through a gas discharge hole formed in the housing. Is widely used.

In this connection, a gas generator in which a tubular filter is arranged between the combustion chamber and the gas discharge hole for cooling the combustion gas and collecting the residue is known (for example, Patent Document). 1). In such a gas generator, the housing includes a cylindrical peripheral wall portion, a top plate portion that closes one end of the peripheral wall portion, and a bottom plate portion that closes the other end and fixes an igniter. Widely used, one end surface of a filter abuts on a top plate portion and is supported, and the other end surface abuts on a bottom plate portion and is supported.

By the way, in a gas generator, the internal pressure of the housing increases due to the generation of combustion gas, and the housing may be deformed so as to expand. At this time, when the structure is such that the top plate portion and the bottom plate portion are connected only by the tubular peripheral wall portion as in the above-mentioned gas generator, the top plate portion and the bottom plate portion are more connected than the peripheral wall portion due to the structure. It tends to be larger and more easily deformed.

On the other hand, in the gas generator disclosed in Patent Document 1, a part of the igniter collar for attaching the igniter to the bottom plate portion of the housing is formed thinly, and the igniter collar is formed in response to the deformation of the bottom plate portion. By deforming it, it is configured to absorb the strain caused by the deformation of the bottom plate portion. This suppresses the formation of a gap between the igniter collar and the housing and the formation of cracks in the housing, thereby suppressing the leakage of combustion gas from the gap and the cracks to the outside of the housing.

Japanese Unexamined Patent Publication No. 2008-114718 U.S. Patent Application Publication No. 2016/524885

However, in the gas generator as described above, it is not possible to sufficiently suppress the top plate portion and the bottom plate portion from being separated from the end face of the filter due to the deformation of the housing due to the pressure of the combustion gas. If the top plate or bottom plate is separated from the end face of the filter and a gap is created between the end face of the filter and the top plate or between the end face of the filter and the bottom plate, part of the combustion gas will not pass through the filter. There is a risk that a so-called "short pass" will occur, which will reach the gas discharge hole through the gap and be discharged from the housing.

The technique of the present disclosure has been made in view of the above-mentioned problems, and an object thereof is to provide a technique capable of suppressing a short path in a gas generator.

In order to solve the above problems, the technology of the present disclosure adopts the following configuration. That is, the technique of the present disclosure includes an ignition unit, a combustion chamber in which a gas generating agent that burns by the operation of the ignition unit is arranged, and a combustion chamber.
A tubular peripheral wall portion, a first wall portion provided on one end side of the peripheral wall portion, and a peripheral wall portion provided on the other end side of the peripheral wall portion so as to face the first wall portion, and the peripheral wall portion and the first wall portion. A housing including a second wall portion that defines the combustion chamber together with one wall portion and to which the ignition portion is fixed, and a gas discharge hole that communicates the combustion chamber and the outside of the housing is formed. A gas generator comprising a housing and a tubular filter that surrounds the gas generating agent and is arranged in the combustion chamber so that the gas discharge holes are located outside the housing. The peripheral wall portion is formed on the peripheral surface of the peripheral wall portion at a position at a predetermined height from the second wall portion, and the height of the peripheral wall portion is increased by the pressure increase in the combustion chamber caused by the operation of the ignition portion. The filter has a deformed portion that is deformed so as to be such that one end thereof abuts on the first wall portion and the other end is located on the first wall portion side with respect to the deformed portion. A gas generator arranged in the housing.

That is, the gas generator of the present disclosure is configured so that the deformed portion is deformed so that the height of the peripheral wall portion is increased due to the increase in pressure in the combustion chamber, and the volume of the housing is increased. Therefore, the housing is deformed so that the entire first wall portion is lifted relative to the second wall portion. As a result, the expansion of the housing is absorbed by the increase in the volume of the housing due to the deformation of the deformed portion, and the deformation of the first wall portion and the second wall portion is suppressed. Further, since the filter is arranged in the housing so that one end of the filter abuts on the first wall portion and the other end is located on the first wall portion side with respect to the deformed portion, the deformed portion is deformed. When the height of the peripheral wall portion becomes high, the filter will be lifted together with the first wall portion. According to such a gas generator, even if the housing is deformed due to an increase in pressure in the combustion chamber, the deformation of the first wall portion is suppressed and the filter is lifted together with the first wall portion to form one end of the filter. The contact state with the first wall portion is maintained. As a result, according to the gas generator of the present disclosure, it is possible to suppress a short path due to the first wall portion being separated from one end of the filter. The contact state between the filter and the first wall portion may be a state in which the two are in direct contact with each other, and a state in which the two can be said to be substantially in contact with each other via a gasket or the like, that is, It may be in an indirect contact state.

Further, in the gas generator of the present disclosure, the deformed portion may be formed as a part of the peripheral wall portion, and the wall thickness may be formed thinner than other portions of the peripheral wall portion. , The peripheral wall portion may be bent and formed in a cross section along the height direction.

According to this, by forming the deformed portion to be thin, the deformed portion can be easily deformed as compared with other portions in the peripheral wall portion. Further, by forming the deformed portion by bending it, the deformed portion can be deformed so that the height of the peripheral wall portion becomes high.

Further, the gas generator of the present disclosure is press-fitted into the inner wall surface of the peripheral wall portion on the side of the first wall portion with the deformed portion as a reference in the peripheral wall portion, and is not fixed to the second wall portion. The other end of the filter may be held by the holding member, and one end of the filter may be in contact with the inner wall surface of the first wall portion.

According to this, since the holding member is press-fitted to the inner wall surface of the peripheral wall portion on the first wall side of the deformed portion and is not fixed to the second wall portion, the deformed portion is deformed and the peripheral wall portion is deformed. When the height of the member becomes high, the holding member will be lifted together with the first wall portion. Therefore, even when the deformed portion is deformed and the height of the peripheral wall portion is increased, the holding state of the other end of the filter by the holding member is maintained. As a result, according to the gas generator of the present disclosure, it is possible to suppress a short path due to the holding member being separated from the other end of the filter.

Further, the gas generator of the present disclosure is supported by the deformed portion formed by bending inside the housing, and the second wall portion is further provided with a non-fixed holding member, and the filter is said to have the same function. The other end may be held by the holding member, and the one end of the filter may be in contact with the inner wall surface of the first wall portion.

According to this, since the holding member is supported by the deformed portion and is not fixed to the second wall portion, when the deformed portion is deformed and the height of the peripheral wall portion is increased, the holding member is the first wall. It will be lifted with the club. Therefore, even when the deformed portion is deformed and the height of the peripheral wall portion is increased, the holding state of the other end of the filter by the holding member is maintained. As a result, according to the gas generator of the present disclosure, it is possible to suppress a short path due to the holding member being separated from the other end of the filter.

Further, in the gas generator of the present disclosure, the peripheral wall portion further has a protrusion portion protruding from the inner wall surface of the peripheral wall portion on the first wall portion side toward the combustion chamber with respect to the deformed portion. The other end of the filter may be held by the protrusion, and the one end of the filter may be in contact with the inner wall surface of the first wall portion.

According to this, since the protrusion is formed on the first wall side with respect to the deformed portion, when the deformed portion is deformed and the height of the peripheral wall portion is increased, the protrusion is formed together with the first wall portion. It will be lifted. Therefore, even when the deformed portion is deformed and the height of the peripheral wall portion is increased, the holding state of the other end of the filter by the protruding portion is maintained. As a result, according to the gas generator of the present disclosure, it is possible to suppress a short path due to the protrusion being separated from the other end of the filter.

Further, in the gas generator of the present disclosure, the first wall portion has a peripheral portion connected to the peripheral wall portion and with which one end of the filter abuts, and a central portion adjacent to the peripheral portion. In the cross section along the height direction of the peripheral wall portion, the peripheral portion may be inclined so as to intersect each of the peripheral wall portion and the central portion at an obtuse angle.

Here, the obtuse angle means an angle larger than a right angle and smaller than a flat angle. According to the gas generator, the peripheral portion abuts on one end of the filter from the radial outside of the filter. As a result, one end of the filter is abutted and supported by the peripheral portion against the radial outward load due to the combustion of the gas generating agent. As a result, the filter is restricted from being displaced due to the radial outer load acting on the filter due to the combustion of the gas generating agent, and the contact state between one end of the filter and the first wall portion can be maintained. As a result, according to the gas generator of the present disclosure, the short path can be suppressed more preferably.

Further, in the gas generator of the present disclosure, the ignition unit includes a plurality of ignition devices, and the plurality of ignition devices are fixed to the second wall portion, corresponding to each of the plurality of ignition devices. A plurality of tubular inner cylinder members surrounding each ignition device may be attached along the height direction of the peripheral wall portion. The technique of the present disclosure can be applied to, for example, a so-called single type gas generator equipped with only one ignition device and a so-called dual type gas generator equipped with two ignition devices.

According to the technique of the present disclosure, it is possible to suppress a short path in a gas generator.

It is sectional drawing in the axial direction of the gas generator which concerns on Embodiment 1. FIG. It is a perspective view of the lower shell which concerns on Embodiment 1. FIG. It is a figure which shows the state which the gas generator which concerns on Embodiment 1 operates. It is sectional drawing in the axial direction of the gas generator which concerns on modification 1 of Embodiment 1. FIG. It is a figure which shows the state which the gas generator which concerns on the modification 1 of Embodiment 1 is operating. It is sectional drawing in the axial direction of the gas generator which concerns on modification 2 of Embodiment 1. FIG. It is a figure which shows the state which the gas generator which concerns on the modification 2 of Embodiment 1 operates. It is an axial sectional view of the gas generator which concerns on the modification 3 of Embodiment 1. FIG. It is sectional drawing in the axial direction of the gas generator which concerns on Embodiment 2. FIG.

Hereinafter, the gas generator according to the embodiment of the present disclosure will be described with reference to the drawings. It should be noted that the configurations and combinations thereof in each embodiment are examples, and the configurations can be added, omitted, replaced, and other changes as appropriate within the range not deviating from the gist of the present invention. The present disclosure is not limited by embodiments, but only by the claims.

<Embodiment 1>
FIG. 1 is an axial sectional view of the gas generator 100 according to the first embodiment. FIG. 1 shows a state before the operation of the gas generator 100. The gas generator 100 is an airbag gas generator used for, for example, an airbag.

[overall structure]
As shown in FIG. 1, the gas generator 100 includes a first ignition device 4X, a second ignition device 4Y, a first inner cylinder member 5X, a second inner cylinder member 5Y, a filter 6, and a retainer 7. The igniter 110, the first gas generator 120X, the second gas generator 120Y, and the housing 1 for accommodating these are provided. The gas generator 100 is configured as a so-called dual type gas generator provided with two ignition devices. The configuration including the first ignition device 4X and the second ignition device 4Y corresponds to the "ignition unit" according to the present disclosure. The gas generator 100 burns the first gas generator 120X by the operation of the first ignition device 4X, and burns the second gas generator 120Y by the operation of the second ignition device 4Y, so that a relatively large amount of combustion gas is produced. Is configured to be discharged from the gas discharge hole 11.

[housing]
Both ends of the housing 1 are closed in the axial direction by joining the upper shell 2 and the lower shell 3 made of metal, each of which is formed in a substantially cylindrical shape with a bottom, so that their open ends face each other. It is formed in a short cylindrical shape. Here, the direction along the axial direction of the housing 1 is defined as the height direction (vertical direction) of the gas generator 100, the upper shell 2 side (that is, the upper side in FIG. 1) is defined as the upper side of the gas generator 100, and the lower part. The shell 3 side (that is, the lower side in FIG. 1) is the lower side of the gas generator 100.

The upper shell 2 has a tubular upper peripheral wall portion 21 and a top plate portion 22 that closes the upper end of the upper peripheral wall portion 21, and forms an internal space by these. An opening of the upper shell 2 is formed by the lower end portion of the upper peripheral wall portion 21. The lower shell 3 has a cylindrical lower peripheral wall portion 31 and a bottom plate portion 32 that closes the lower end of the lower peripheral wall portion 31, and forms an internal space by these. A first ignition device 4X and a second ignition device 4Y are fixed to the bottom plate portion 32.

The housing 1 is formed by fitting the upper peripheral wall portion 21 of the upper shell 2 and the lower peripheral wall portion 31 of the lower shell 3. More specifically, the upper end portion of the lower peripheral wall portion 31 is press-fitted into the inner wall surface of the upper peripheral wall portion 21, and these are joined by laser welding or the like to form a short cylindrical shape in which both ends in the axial direction are closed. Housing 1 is formed. The upper peripheral wall portion 21 of the upper shell 2 and the lower peripheral wall portion 31 of the lower shell 3 form a cylindrical peripheral wall portion 12 connecting the top plate portion 22 and the bottom plate portion 32. That is, the housing 1 includes a cylindrical peripheral wall portion 12, a top plate portion 22 provided on one end side of the peripheral wall portion 12, and a bottom plate portion 32 provided on the other end side. The top plate portion 22, the bottom plate portion 32, and the peripheral wall portion 12 define a first combustion chamber 10X in which the first gas generating agent 120X is arranged. The top plate portion 22 corresponds to the “first wall portion” according to the present disclosure, and the bottom plate portion 32 corresponds to the “second wall portion” according to the present disclosure. Further, the first combustion chamber 10X corresponds to the "combustion chamber" according to the present disclosure. As shown in FIG. 1, in the upper peripheral wall portion 21 of the upper shell 2, a plurality of gas discharge holes 11 communicating with the first combustion chamber 10X and the external space of the housing 1 are formed side by side along the circumferential direction. There is. The gas discharge hole 11 is closed by a sealing tape (not shown) before the first ignition device 4X is operated.

Here, as shown in FIG. 1, the peripheral wall portion 12 has a deformed portion D1 formed on the peripheral edge of the peripheral wall portion 12 at a position at a predetermined height from the bottom plate portion 32. The deformed portion D1 is formed as a part of the peripheral wall portion 12. More specifically, the deformed portion D1 is formed as a part of the lower peripheral wall portion 31 excluding the fitting portion with the upper peripheral wall portion 21. Further, the deformed portion D1 is formed so as to be more easily deformed than other portions of the peripheral wall portion 12 in a cross section along the height direction of the peripheral wall portion 12. Specifically, the deformed portion D1 is formed to have a thinner wall than the other portions of the peripheral wall portion 12, and is further bent. Since the deformed portion D1 is formed to be thin, it is more easily deformed than other portions in the peripheral wall portion 12. FIG. 2 is a perspective view of the lower shell 3. As shown in FIG. 2, the deformed portion D1 related to the gas generator 100 is formed in an annular shape on the periphery of the peripheral wall portion, and is radially inward of the peripheral wall portion (that is, toward the first combustion chamber 10X). It is bent so that it protrudes. The technique of the present disclosure is not limited to this, and the deformed portion D1 may be bent so as to project radially outward of the peripheral wall portion, or may not be formed in an annular shape. For example, the deformed portion may be formed intermittently on the periphery of the peripheral wall portion. That is, in the present disclosure, "the deformed portion D1 is formed" means that the peripheral wall portion 12 is formed so as to be deformed when it is operated.

Further, as shown in FIG. 1, the top plate portion 22 has a peripheral portion 221 connected to the peripheral wall portion 12 and a central portion 222 adjacent to the peripheral portion 221. Here, the angle formed by the peripheral portion 221 and the peripheral wall portion 12 is defined as C1, and the angle formed by the peripheral portion 221 and the central portion 222 is defined as C2. At this time, the peripheral portion 221 is inclined so that both C1 and C2 have an obtuse angle in the cross section along the height direction of the peripheral wall portion 12. The obtuse angle means an angle larger than a right angle and smaller than a flat angle.

[Ignition system]
The first ignition device 4X and the second ignition device 4Y are fixed to the bottom plate portion 32 of the lower shell 3. Each ignition device is operated by supplying an ignition current to burn the igniting agent contained therein and release the combustion product to the outside. As a result, the gas generating agent around each igniter burns.

[Inner cylinder member]
The first inner cylinder member 5X and the second inner cylinder member 5Y are formed in a cylindrical shape in which one end (upper end) is closed and the other end (lower end) is open. The first inner cylinder member 5X is attached to the first ignition device 4X, and the second inner cylinder member 5Y is attached along the height direction so as to surround the second ignition device 4Y. A fire transmission room 51, which is a space in which the transmission charge 110 is arranged, is formed between the first inner cylinder member 5X and the first ignition device 4X. On the other hand, a second combustion chamber 10Y, which is a space in which the second gas generating agent 120Y is arranged, is formed between the second inner cylinder member 5Y and the second ignition device 4Y. Further, the first inner cylinder member 5X and the second inner cylinder member 5Y are formed with a plurality of communication holes 52 for communicating the internal space and the external space. The communication hole 52 is closed by a known method such as a sealing tape (not shown) or another closing member before each ignition device is activated.

[Retainer]
The retainer 7 is a member that supports the filter 6. As shown in FIG. 1, the retainer 7 has an annular portion 71 and a tubular portion 72. The annular portion 71 is formed in an annular shape, and the peripheral wall portion 12 is formed.
It is press-fitted against the inner wall surface of. More specifically, in the peripheral wall portion 12, the annular portion 71 is press-fitted into the inner wall surface of the peripheral wall portion 12 on the top plate portion 22 side (that is, the upper side) with respect to the deformed portion D1. The tubular portion 72 is formed in a cylindrical shape extending downward from the inner peripheral edge of the annular portion 71, and its lower end is in contact with the inner wall surface of the bottom plate portion 32. The tubular portion 72 is not fixed to the bottom plate portion 32. As a result, the retainer 7 is press-fitted into the inner wall surface of the peripheral wall portion 12 on the top plate portion 22 side with respect to the deformed portion D1 in the peripheral wall portion 12, and is not fixed to the bottom plate portion 32. The retainer 7 corresponds to the "holding member" in the present disclosure. The width dimension of the annular portion 71 in the radial direction is set so that the tubular portion 72 does not come into contact with the deformed portion D1 and is not deformed. Further, in the retainer 7, the contact area between the retainer 7 and the inner wall surface of the peripheral wall portion 12 at the time of press fitting may be increased by integrally forming a tubular portion extending upward from the outer peripheral edge of the annular portion 71. ..

[filter]
As shown in FIG. 1, the filter 6 is formed in a cylindrical shape, surrounds the gas generating agent 120, and is arranged in the combustion chamber 10 so that the gas discharge hole 11 is located outside the gas discharge hole 11 in the radial direction thereof. Has been done. That is, the filter 6 is arranged between the gas generator 120 and the gas discharge hole 11 so as to surround the gas generator 120. Of both ends in the axial direction, one end (upper end surface indicated by reference numeral 61) of the filter 6 is in contact with the top plate portion 22 of the upper shell 2, and the other end (lower end surface indicated by reference numeral 62) is an annular shape of the retainer 7. It is in a state of being held by the unit 71. That is, the filter 6 is arranged in the housing 1 so that the upper end surface 61 abuts on the top plate portion 22 and the lower end surface 62 is located on the top plate portion 22 side with respect to the deformed portion D1. A gap 13 is formed between the filter 6 and the peripheral wall portion 12. The filter 6 cools the combustion gas by taking heat of the combustion gas when the combustion gas of the gas generating agent arranged in each combustion chamber 10 passes through the filter 6. Further, the filter 6 has a function of filtering the combustion gas by collecting the combustion residue contained in the combustion gas, in addition to the function of cooling the combustion gas. In FIG. 1, reference numeral 63 indicates an inner peripheral surface of the filter 6, and reference numeral 64 indicates an outer peripheral surface of the filter 6. In this example, the upper end surface 61 of the filter 6 and the top plate portion 22 are in direct contact with each other, and the lower end surface 62 and the annular portion 71 are in direct contact with each other, but a sealing member such as a gasket is interposed between them. You may.

[Gunpowder]
As the propellant 110, in addition to the known black powder, a gas generator having good ignitability and a higher combustion temperature than the first gas generating agent 120X and the second gas generating agent 120Y can be used. The combustion temperature of the propellant 110 can be set in the range of 1700 to 3000 ° C. As such a gunpowder, known ones containing, for example, nitroguanidine (34% by weight) and strontium nitrate (56% by weight) can be used. Further, various shapes such as granules, pellets, columns, and disks can be adopted for the explosive agent 110.

[Gas generator]
As the first gas generator 120X and the second gas generator 120Y, a gas generator having a relatively low combustion temperature can be used, and the combustion temperature can be set in the range of 1000 to 1700 ° C. As such a gas generating agent, known agents including, for example, guanidine nitrate (41% by weight), basic copper nitrate (49% by weight), a binder and additives can be used. Further, various shapes such as granules, pellets, columns, and disks can be adopted for the first gas generator 120X and the second gas generator 120Y.

[motion]
Hereinafter, the operation of the gas generator 100 according to the first embodiment will be described with reference to FIG. First, when the sensor (not shown) senses an impact, an ignition current is supplied to the first ignition device 4X, and the first ignition device 4X operates. As a result, the gunpowder 110 arranged in the firebox 51
Burns and combustion gas is generated. The combustion gas of the fire transfer agent 110 breaks the sealing tape that has blocked the communication hole 52 of the first inner cylinder member 5X and is discharged from the communication hole 52 to the outside of the fire transmission room 51. Then, the combustion gas of the propellant 110 comes into contact with the first gas generating agent 120X, and the first gas generating agent 120X is ignited. Combustion of the first gas generating agent 120X produces high-temperature, high-pressure combustion gas in the first combustion chamber 10X. When this combustion gas passes through the filter 6, the combustion gas is cooled and the combustion residue is collected. The combustion gas of the first gas generating agent 120X cooled and filtered by the filter 6 passes through the gap 13, breaks the sealing tape that has blocked the gas discharge hole 11, and is discharged from the gas discharge hole 11 to the outside of the housing 1. Will be done. Next, the second ignition device 4Y operates, the second gas generating agent 120Y arranged in the second combustion chamber 10Y burns, and the combustion gas is generated. The combustion gas of the second gas generating agent 120Y breaks the sealing tape blocking the communication hole 52 of the second inner cylinder member 5Y, flows into the first combustion chamber 10X, passes through the filter 6, and passes through the gas discharge hole 11. It is discharged to the outside of the housing 1. The combustion gas of the first gas generating agent 120X and the second gas generating agent 120Y flows into the airbag (not shown) after being discharged to the outside of the housing 1. The expansion of the airbag creates a cushion between the occupant and the rigid structure, protecting the occupant from impact.

By the way, in the gas generator, when the internal pressure of the housing forming the combustion chamber rises due to the combustion of the gas generator and the generation of combustion gas in the combustion chamber, the housing may be deformed to expand. That is, the housing may be deformed to increase its internal volume. Here, in general, in a housing having a structure in which the top plate portion and the bottom plate portion are connected only by a cylindrical peripheral wall portion, there is no member other than the peripheral wall portion for connecting or fixing the top plate portion and the bottom plate portion. The top plate and bottom plate tend to be larger and more easily deformed than the peripheral wall. As the internal pressure of the housing rises, pressure acts on the top plate and bottom plate in a direction that tends to separate the top plate and bottom plate from the end face of the filter, but the housing expands due to the rise in internal pressure. When the top plate portion and the bottom plate portion are deformed and a gap is formed between the end face of the filter and the top plate portion or the bottom plate portion, a part of the combustion gas does not pass through the filter and is discharged through the gap. There is concern that it will reach the hole. That is, there is a risk that a so-called "short pass" will occur.

Here, FIG. 3 is a diagram showing a state in which the gas generator 100 is operated. The gas generator 100 according to the first embodiment is configured to suppress a short path even when the housing 1 is deformed so as to swell due to the pressure of the combustion gas. Hereinafter, it will be described in detail.

When the first ignition device 4X and the second ignition device 4Y are operated, the internal pressure of the first combustion chamber 10X rises due to the generation of combustion gas. At this time, as described above, the peripheral wall portion 12 is formed with a deformed portion D1 that is more easily deformed than other portions of the peripheral wall portion 12. Therefore, when the housing 1 is deformed so as to expand due to the increase in pressure in the first combustion chamber 10X, the deformed portion D1 is deformed in preference to the other portions in the peripheral wall portion 12. At this time, as shown in FIGS. 1 and 3, the deformed portion D1 is deformed so as to extend from the bent state. As a result, the height of the peripheral wall portion 12 in the deformed state of the deformed portion D1 becomes higher than that in the state before the deformed portion D1 is deformed. That is, the housing 1 is deformed so that the entire top plate portion 22 is lifted relative to the bottom plate portion 32. This increases the volume of the housing 1.

[Action / Effect]
As described above, the gas generator 100 according to the first embodiment is configured so that the deformed portion D1 is deformed by the pressure increase in the first combustion chamber 10X and the height of the peripheral wall portion 12 is increased. As a result, the influence of the pressure increase in the first combustion chamber 10X is less likely to affect the top plate portion 22 and the bottom plate portion 32. That is, the expansion of the housing 1 is absorbed by the volume increase of the housing 1 due to the deformation of the deformed portion D1, so that the deformation of the top plate portion 22 and the bottom plate portion 32 is suppressed. Further, in the gas generator 100, the filter 6 is arranged in the housing 1 so that the upper end surface 61 abuts on the top plate portion 22 and the lower end surface 62 is located on the top plate portion 22 side with respect to the deformed portion D1. ing. That is, by arranging the filter 6 closer to the top plate portion 22 than the deformed portion D1, when the deformed portion D1 is deformed and the height of the peripheral wall portion 12 becomes higher, the filter 6 is lifted together with the top plate portion 22. It becomes. As shown in FIG. 3, even when the housing 1 is deformed due to the pressure increase in the first combustion chamber 10X, the deformation of the top plate portion 22 is suppressed and the filter 6 is lifted together with the top plate portion 22. The contact state between the upper end surface 61 of the filter 6 and the top plate portion 22 is maintained. As a result, according to the gas generator 100 according to the first embodiment, it is possible to suppress a short path caused by the top plate portion 22 being separated from the upper end surface 61 of the filter 6.

Further, the gas generator 100 according to the first embodiment is press-fitted into the inner wall surface of the peripheral wall portion 12 on the top plate portion 22 side with respect to the deformed portion D1 in the peripheral wall portion 12, and is not applied to the bottom plate portion 32. It is equipped with a fixed retainer 7. The gas generator 100 is configured such that the lower end surface 62 of the filter 6 is held by the retainer 7 and the upper end surface 61 of the filter 6 is in contact with the inner wall surface of the top plate portion 22. According to this, since the retainer 7 is press-fitted into the peripheral wall portion 12 on the top plate portion 22 side of the deformed portion D1 and is not fixed to the bottom plate portion 32, the deformed portion D1 is deformed and the height of the peripheral wall portion 12 is increased. When the height becomes high, the retainer 7 is lifted to the side of the top plate portion 22 together with the filter 6 without moving from the press-fitted position. Therefore, even when the deformed portion D1 is deformed and the height of the peripheral wall portion 12 becomes high, the holding state of the lower end surface 62 of the filter 6 by the retainer 7 is maintained. As a result, in the gas generator 100 according to the first embodiment, a short path due to the retainer 7 moving away from the lower end surface 62 of the filter 6 can be suppressed. The retainer 7 according to the present embodiment has a tubular portion 72 extending downward from the annular portion 71 press-fitted into the peripheral wall portion 12, but the tubular portion 72 is not an essential configuration.

Further, in the gas generator 100 according to the first embodiment, the deformed portion D1 is formed as a part of the peripheral wall portion 12, the wall thickness is thinner than the other portions of the peripheral wall portion 12, and the wall thickness is the same. It is formed by bending in a cross section along the height direction of the peripheral wall portion 12. According to this, by forming the deformed portion D1 to be thin, the deformed portion D1 can be easily deformed as compared with other portions in the peripheral wall portion 12, and by forming the deformed portion D1 by bending, the height of the peripheral wall portion 12 is formed. The deformed portion D1 can be deformed so that

Further, in the gas generator 100 according to the first embodiment, the top plate portion 22 is connected to the peripheral wall portion 12 and the upper end surface 61 of the filter 6 is in contact with the peripheral portion 221 and the central portion 222 adjacent to the peripheral portion 221. And have. Then, in the cross section along the height direction of the peripheral wall portion 12, the peripheral portion 221 is inclined so as to intersect each of the peripheral wall portion 12 and the central portion 222 at an obtuse angle. Therefore, as shown in FIGS. 1 and 3, the peripheral portion 221 abuts on the upper end surface 61 of the filter 6 from the radial outside of the filter 6. As a result, the upper end surface 61 of the filter 6 is abutted and supported by the peripheral portion 221 against the load outward in the radial direction due to the combustion of the gas generating agent. As a result, the filter 6 is restricted from being displaced due to the radial outer load acting on the filter 6 due to the combustion of the gas generating agent, and the contact state between the upper end surface 61 of the filter 6 and the top plate portion 22 is maintained. Can be done. As a result, the short path can be suppressed more preferably.

[Modified Example 1]
Hereinafter, the gas generator according to the modified example of the first embodiment will be described. In the explanation of the modification, the differences from the gas generator 100 described with reference to FIGS. 1 to 3 will be mainly described, and the same points as those of the gas generator 100 will be designated by the same reference numerals, so that detailed explanations will be omitted. do.

[Modification 1 of Embodiment 1]
FIG. 4 is an axial sectional view of the gas generator 100A according to the first modification of the first embodiment. FIG. 4 shows a state before the operation of the gas generator 100A. FIG. 5 is a diagram showing a state in which the gas generator 100A is operated. As shown in FIG. 4, in the gas generator 100A, the lower end surface 62 of the filter 6 is held by the retainer 7A, and the upper end surface 61 of the filter 6 is the top plate portion 2.
It is in a state of being in contact with the inner wall surface of 2. The retainer 7A related to the gas generator 100A is press-fitted into the inner wall surface of the peripheral wall portion 12, and is further supported by the deforming portion D1 inside the housing 1 by being placed on the deforming portion D1. .. The retainer 7A is not fixed to the bottom plate portion 32.

In the gas generator 100A, the same effect as that of the gas generator 100 described above can be obtained. That is, according to the gas generator 100A, even when the housing 1 is deformed due to an increase in pressure in the first combustion chamber 10X, the deformed portion D1 is deformed so that the height of the peripheral wall portion 12 becomes higher, so that the top plate portion is formed. Deformation of 22 is suppressed, and the filter 6 is lifted to the side of the top plate portion 22 together with the retainer 7A. Therefore, as shown in FIG. 5, the contact state between the upper end surface 61 of the filter 6 and the top plate portion 22 and the lower end surface 62 of the filter 6 and the retainer 7A is maintained. As a result, according to the gas generator 100A, the short path generated on the upper end surface 61 and the lower end surface 62 of the filter 6 can be suppressed.

[Modification 2 of Embodiment 1]
FIG. 6 is an axial sectional view of the gas generator 100B according to the second modification of the first embodiment. FIG. 6 shows the state before the operation of the gas generator 100B. FIG. 7 is a diagram showing a state in which the gas generator 100B is operated. As shown in FIG. 6, the peripheral wall portion 12 related to the gas generator 100B is a protrusion protruding from the inner wall surface of the peripheral wall portion 12 on the top plate portion 22 side toward the first combustion chamber 10X with respect to the deformed portion D1. It has a portion 121. The protrusion 121 is intermittently formed on the periphery of the peripheral wall portion 12. However, the protrusions according to the present disclosure may be continuously formed in an annular shape on the periphery of the peripheral wall portion. The gas generator 100B is configured to hold the lower end surface 62 of the filter 6 by the protrusion 121 without providing the retainer 7 and the retainer 7A described above. As shown in FIG. 6, in the gas generator 100B, the lower end surface 62 of the filter 6 is held by the protrusion 121, and the upper end surface 61 of the filter 6 is in contact with the inner wall surface of the top plate portion 22. ing.

In the gas generator 100B as well, similarly to the gas generator 100 described above, it is possible to suppress a short path due to the top plate portion 22 being separated from the upper end surface 61 of the filter 6. Further, since the protrusion 121 is formed on the top plate 22 side with the deformed portion D1 as a reference, when the deformed portion D1 is deformed and the height of the peripheral wall portion 12 becomes high, the protrusion 121 is formed on the top plate. It will be lifted together with the part 22. Therefore, as shown in FIG. 7, even when the deformed portion D1 is deformed and the height of the peripheral wall portion 12 becomes high, the holding state of the lower end surface 62 of the filter 6 by the protrusion 121 is maintained. As a result, according to the gas generator 100B, it is possible to suppress a short path caused by the protrusion 121 being separated from the lower end surface 62 of the filter 6. When the protrusion 121 is formed intermittently on the peripheral wall portion 12, between the lower end surface 62 of the filter 6 and the protrusion 121 from the viewpoint of preventing a short path of combustion gas in the vicinity of the lower end of the filter 6. The structure may be such that an annular seal member is arranged. When the sealing member is not used, the outer peripheral surface 64 on the lower end surface 62 side of the filter 6 may be press-fitted into the lower peripheral wall portion 31.

[Modification 3 of Embodiment 1]
FIG. 8 is an axial sectional view of the gas generator 100C according to the third modification of the first embodiment. FIG. 8 shows a state before the operation of the gas generator 100C. As shown in FIG. 8, the housing 1 according to the third modification of the first embodiment separates the internal space of the housing 1 into the first combustion chamber 10X and the second combustion chamber 10Y, and abuts the lower end surface 62 of the filter 6. It has a partition wall portion 14 that supports the partition wall portion 14. The partition wall portion 14 is provided between the top plate portion 22 and the bottom plate portion 32 in the height direction of the peripheral wall portion 12. A through hole 14a is formed in the partition wall portion 14. The first inner cylinder member 5X according to the gas generator 100C is attached along the height direction of the peripheral wall portion 12 so as to surround the first ignition device 4X, and also penetrates the through hole 14a of the partition wall portion 14. The upper end is open. The second inner cylinder member 5Y related to the gas generator 100C is attached along the height direction of the peripheral wall portion 12 so as to surround the second ignition device 4Y, and the upper end portion is closed without penetrating the partition wall portion 14. There is. The second inner cylinder member 5Y may be filled with the explosive charge 110. In the gas generator 100C, the first combustion chamber 10X is defined by the top plate portion 22, the bottom plate portion 32, the peripheral wall portion 12, the partition wall portion 14, and the first inner cylinder member 5X. The internal space of the first inner cylinder member 5X is included in the first combustion chamber 10X. Further, the second combustion chamber 10Y is defined by the partition wall portion 14, the peripheral wall portion 12, the bottom plate portion 32, and the second inner cylinder member 5Y. A first gas generating agent 120X that burns by the operation of the first ignition device 4X is arranged in the first combustion chamber 10X, and a second gas that burns by the operation of the second ignition device 4Y is generated in the second combustion chamber 10Y. Agent 120Y is placed.

Inside the first inner cylinder member 5X, a partition member P1 that partitions the internal space up and down is arranged. As a result, of the internal space of the first inner cylinder member 5X, the space below the partition member P1 (on the side of the first ignition device 4X) is formed as a fire transmission room 51 in which the fire transfer agent 110 is arranged. .. Further, the first inner cylinder member 5X is formed with a plurality of communication holes 52 for communicating the internal space (that is, the first combustion chamber 10X) and the second combustion chamber 10Y. The communication hole 52 is closed by a sealing tape (not shown) or the like before the second ignition device 4Y is operated.

As shown in FIG. 8, in the gas generator 100C, the deformed portion D1 is a part of the peripheral wall portion 12 at a predetermined height position on the top plate portion 22 side with respect to the partition wall portion 14 in the peripheral wall portion 12. It is formed on the periphery of the peripheral wall portion 12. The deformed portion D1 is formed in a cross section along the height direction of the peripheral wall portion 12 so that the wall thickness is thinner than the other portions of the peripheral wall portion 12 and the deformed portion D1 is bent. Further, the retainer 7 related to the gas generator 100C is press-fitted into the inner wall surface of the peripheral wall portion 12 on the top plate portion 22 side with the deformed portion D1 as a reference in the peripheral wall portion 12, and is not fixed to the partition wall portion 14. It has become. Further, in the filter 6 of the gas generator 100C, the lower end surface 62 is held by the retainer 7, and the upper end surface 61 is in contact with the inner wall surface of the top plate portion 22.

When such a gas generator 100C is activated, first, the first ignition device 4X is activated, the combustion charge 110 arranged in the transmission chamber 51 of the first combustion chamber 10X is burned, and the combustion gas is generated. .. When the partition member P1 is burned and removed by the combustion gas of the propellant 110, the combustion gas comes into contact with the first gas generating agent 120X, and the first gas generating agent 120X is ignited. Combustion gas is generated in the first combustion chamber 10X by burning the first gas generating agent 120X. The combustion gas of the first gas generating agent 120X passes through the filter 6 and is discharged from the gas discharge hole 11 to the outside of the housing 1. Next, the second ignition device 4Y operates, the second gas generating agent 120Y arranged in the second combustion chamber 10Y burns, and the combustion gas is generated. The combustion gas of the second gas generating agent 120Y breaks the sealing tape blocking the communication hole 52 of the first inner cylinder member 5X, flows into the first combustion chamber 10X, passes through the filter 6, and passes through the gas discharge hole 11. It is discharged to the outside of the housing 1.

In the gas generator 100C, the same effect as that of the gas generator 100 described above can be obtained. That is, according to the gas generator 100C, even when the housing 1 is deformed due to an increase in pressure in the first combustion chamber 10X, the deformed portion D1 is deformed so that the height of the peripheral wall portion 12 becomes higher, so that the top plate portion is formed. Deformation of 22 is suppressed and the filter 6 is lifted together with the top plate portion 22. Therefore, the contact state between the upper end surface 61 of the filter 6 and the top plate portion 22 is maintained, and a short path due to the top plate portion 22 moving away from the upper end surface 61 of the filter 6 can be suppressed. Further, since the retainer 7 is press-fitted into the peripheral wall portion 12 on the top plate portion 22 side of the deformed portion D1 and is not fixed to the partition wall portion 14, the deformed portion D1 is deformed and the height of the peripheral wall portion 12 is increased. When it becomes high, the retainer 7 will be lifted together with the top plate portion 22. Therefore, even when the deformed portion D1 is deformed and the height of the peripheral wall portion 12 becomes high, the holding state of the lower end surface 62 of the filter 6 is maintained by the retainer 7, and the retainer 7 is separated from the lower end surface 62 of the filter 6 to cause a short circuit. The path can also be suppressed.

<Embodiment 2>
FIG. 9 is an axial sectional view of the gas generator 200 according to the second embodiment. FIG. 9 shows a state before the operation of the gas generator 200. The gas generator 200 is configured as a so-called single type gas generator equipped with only one ignition device. In the first embodiment described above, the ignition unit includes a plurality of ignition devices fixed to the second wall portion, and a plurality of cylindrical inner cylinder members surrounding each ignition device corresponding to each of the plurality of ignition devices. Has described a gas generator having a configuration in which it is mounted along the height direction of the peripheral wall portion, but the technique according to the present disclosure can also be applied to a single type gas generator. Hereinafter, the gas generator 200 according to the second embodiment will be described focusing on the differences from the gas generator 100, and the same points as those of the gas generator 100 will be designated by the same reference numerals, and detailed description thereof will be omitted. ..

As shown in FIG. 9, the gas generator 200 according to the second embodiment includes an ignition device 4, an inner cylinder member 5, a filter 6, a retainer 7, a gunpowder 110, a gas generator 120, and the like. It includes a housing 1 for accommodating. The combustion chamber 10 in which the gas generating agent 120 is arranged is defined by the top plate portion 22, the bottom plate portion 32, and the peripheral wall portion 12 of the housing 1. Further, the inner cylinder member 5 is formed in a cylindrical shape in which one end (upper end) is closed and the other end (lower end) is open, and is attached along the height direction so as to surround the ignition device 4. A fire transmission room 51 is formed between the inner cylinder member 5 and the ignition device 4, and a fire transmission agent 110 is arranged. In the gas generator 200, the ignition device 4 corresponds to the "ignition unit" according to the present disclosure.

In the gas generator 200, the deformed portion D1 is formed as a part of the peripheral wall portion 12. The deformed portion D1 is formed in a cross section along the height direction of the peripheral wall portion 12 so that the wall thickness is thinner than the other portions of the peripheral wall portion 12 and the deformed portion D1 is bent. Further, the retainer 7 is press-fitted into the inner wall surface of the peripheral wall portion 12 on the top plate portion 22 side with the deformed portion D1 as a reference in the peripheral wall portion 12, and is not fixed to the bottom plate portion 32. Further, in the filter 6 of the gas generator 200, the lower end surface 62 is held by the retainer 7, and the upper end surface 61 is in contact with the inner wall surface of the top plate portion 22.

Also in the gas generator 200, the same effect as that of the gas generator 100 according to the first embodiment can be obtained. That is, according to the gas generator 200, even when the housing 1 is deformed due to an increase in pressure in the combustion chamber 10, the deformed portion D1 is deformed so that the height of the peripheral wall portion 12 is increased, so that the top plate portion 22 is deformed. Deformation is suppressed and the filter 6 is lifted together with the top plate portion 22. Therefore, the contact state between the upper end surface 61 of the filter 6 and the top plate portion 22 is maintained, and a short path due to the top plate portion 22 moving away from the upper end surface 61 of the filter 6 can be suppressed. Further, since is pressed into the peripheral wall portion 12 on the top plate portion 22 side of the deformed portion D1 and is not fixed to the bottom plate portion 32, the deformed portion D1 is deformed and the height of the peripheral wall portion 12 becomes high. Occasionally, the retainer 7 will be lifted together with the top plate portion 22. Therefore, even when the deformed portion D1 is deformed and the height of the peripheral wall portion 12 becomes high, the holding state of the lower end surface 62 of the filter 6 is maintained by the retainer 7, and the retainer 7 is separated from the lower end surface 62 of the filter 6 to cause a short circuit. The path can also be suppressed.

<Others>
Although preferred embodiments of the present disclosure have been described above, each aspect disclosed herein can be combined with any other feature disclosed herein.

100,200 Gas generator 1 Housing 11 Gas discharge hole 12 Peripheral wall part 121 Protrusion part 2 Upper shell 22 Top plate part (example of the first wall part)
3 Lower shell 32 Bottom plate (an example of the second wall)
4,4X, 4Y ignition device (an example of ignition unit)
5,5X, 5Y Inner cylinder member 6 Filter 61 Upper end surface (one end of filter)
62 Bottom surface (the other end of the filter)
7,7A retainer (an example of holding member)
10,10X,10Y Combustion chamber 120,120X,120Y Gas generator D1 Displacement part

Claims (7)

Ignition part and
A combustion chamber in which a gas generating agent that burns by the operation of the ignition unit is arranged, and
A tubular peripheral wall portion, a first wall portion provided on one end side of the peripheral wall portion, and a peripheral wall portion provided on the other end side of the peripheral wall portion so as to face the first wall portion, and the peripheral wall portion and the first wall portion. A housing including a second wall portion that defines the combustion chamber together with one wall portion and to which the ignition portion is fixed, and a gas discharge hole that communicates the combustion chamber and the outside of the housing is formed. With the housing
A tubular filter that surrounds the gas generating agent and is arranged in the combustion chamber so that the gas discharge hole is located outside the filter.
It is a gas generator equipped with
The peripheral wall portion is formed on the peripheral surface of the peripheral wall portion at a position at a predetermined height from the second wall portion, and the height of the peripheral wall portion is increased by the pressure increase in the combustion chamber caused by the operation of the ignition portion. It has a deformed part that deforms to be higher,
The filter is arranged in the housing so that one end thereof abuts on the first wall portion and the other end is located on the first wall portion side with respect to the deformed portion.
Gas generator. The deformed portion is formed as a part of the peripheral wall portion, is thinner than the other portions of the peripheral wall portion, and is bent in a cross section along the height direction of the peripheral wall portion. Has been,
The gas generator according to claim 1. The peripheral wall portion is press-fitted into the inner wall surface of the peripheral wall portion on the first wall portion side with the deformed portion as a reference, and the second wall portion is further provided with a non-fixed holding member.
The other end of the filter is held by the holding member, and the one end of the filter is in contact with the inner wall surface of the first wall portion.
The gas generator according to claim 1 or 2. Inside the housing, the second wall portion is further provided with a non-fixed holding member, which is supported by the deformed portion formed by bending.
The other end of the filter is held by the holding member, and the one end of the filter is in contact with the inner wall surface of the first wall portion.
The gas generator according to claim 2. The peripheral wall portion further has a protrusion portion that protrudes from the inner wall surface of the peripheral wall portion on the first wall portion side toward the combustion chamber with respect to the deformed portion.
The other end of the filter is held by the protrusion, and the one end of the filter is in contact with the inner wall surface of the first wall portion.
The gas generator according to claim 1 or 2. The first wall portion has a peripheral portion connected to the peripheral wall portion and with which one end of the filter abuts, and a central portion adjacent to the peripheral portion.
In the cross section along the height direction of the peripheral wall portion, the peripheral portion is inclined so as to intersect each of the peripheral wall portion and the central portion at an obtuse angle.
The gas generator according to any one of claims 1 to 5. The ignition unit includes a plurality of ignition devices.
The plurality of ignition devices are fixed to the second wall portion, and the plurality of ignition devices are fixed to the second wall portion.
Corresponding to each of the plurality of ignition devices, a plurality of tubular inner cylinder members surrounding each ignition device are attached along the height direction of the peripheral wall portion.
The gas generator according to any one of claims 1 to 6.

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