JP2021120249A - Gas generator and method of assembling gas generator - Google Patents

Abstract

To provide a technique that can effectively prevent a short pass in a gas generator.SOLUTION: In a gas generator, a support end surface that is at least one of both axial end surfaces of a filter is in a state where a first portion of the support end surface is in contact with a housing to press the housing, and a second portion that is a portion other than the first portion of the support end surface is supported by the housing while being separated from the housing. A contact state of the first portion of the support end surface with the housing is formed in an annular shape along a circumferential direction of the filter.SELECTED DRAWING: Figure 1

Description

The present invention relates to a gas generator that burns a gas generator by operating an ignition unit to generate combustion gas, and a method for assembling the gas generator.

Conventionally, a gas generator is filled in a combustion chamber formed in a housing, and a gas generator is burned by an igniter to generate a combustion gas, and the combustion gas is discharged to the outside through a gas discharge hole provided in the housing. A gas generator that emits gas is widely used. Further, in such a gas generator, a tubular filter may be arranged between the combustion chamber and the gas discharge hole in order to cool the generated combustion gas and collect the residue. Axial ends of the filter are contacted and supported within the housing so that all of the combustion gas passes through the filter.

In connection with this, Patent Document 1 and Patent Document 2 have a gas generator having a structure for suppressing a so-called "short path" in which a part of combustion gas reaches a gas discharge hole without passing through a filter. Is disclosed. In the gas generator disclosed in Patent Document 1, the end face of the filter is fixed to the housing by attaching a fixture to the end face of the filter, and a short path is suppressed. Further, the gas generator disclosed in Patent Document 2 suppresses a short path by forming a bent portion in a portion of the filter in contact with the housing and pressing the end face of the filter against the housing by the elastic force of the bent portion. ..

International Publication No. 2002/083464 JP-A-2010-234843

However, in the above-mentioned technique, the effect of suppressing the short path is not sufficient, and a technique capable of suppressing the short path more effectively is required.

The technique of the present disclosure has been made in view of the above circumstances, and an object of the present invention is to provide a technique capable of effectively 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 is a combustion chamber in which an ignition unit and a gas generating agent burned by the operation of the ignition unit are arranged, a housing defining the combustion chamber, a tubular peripheral wall portion, and the said. A first wall portion provided on one end side of the peripheral wall portion and a second wall portion provided on the other end side of the peripheral wall portion are included, and the peripheral wall portion includes the combustion chamber and the outside of the housing. A housing having a communicating gas discharge hole and a tubular filter, which are arranged between the gas generator and the gas discharge hole in the combustion chamber so as to surround the gas generator. A gas generator including a filter having one end surface in the axial direction supported by the housing on the side of the first wall portion and the other end surface supported by the housing on the side of the second wall portion. The support end face, which is at least one of both end faces in the axial direction of the filter, is in a state where the first portion, which is a part of the support end face, contacts the housing and presses the housing, and the support The second portion of the end face, which is a portion other than the first portion, is supported by the housing in a state of being separated from the housing, and the contact state between the first portion of the support end face and the housing is described as described above. It is a gas generator formed in a ring shape along the circumferential direction of the filter.

In the gas generator of the present disclosure configured as described above, the support end face is supported by the housing at the first portion, and the first portion presses the housing, so that the load is concentrated on the first portion. Therefore, the first portion of the support end face comes into contact with the housing more strongly than when the support end face is fully supported by the housing. In addition to this, by forming the contact state between the first part and the housing in an annular shape along the circumferential direction of the filter, a gap is created so that the combustion gas can pass from the inner peripheral surface side to the outer peripheral surface side of the filter. It is not formed between the support end face and the housing. Thereby, according to the gas generator of the present disclosure, the short path can be effectively suppressed.

Further, in the gas generator of the present disclosure, the support portion that supports the support end face in the housing is inclined so as to reduce the diameter as the distance from the filter increases in the axial direction of the filter, and the support end face thereof is inclined. The outer peripheral edge may be supported by the housing with the first portion as the first portion.

According to this, by inclining the support portion as described above, the support end face can be supported by the housing at the outer peripheral edge thereof, and the outer peripheral edge of the support end face can be strongly brought into contact with the housing.

Further, in the gas generator of the present disclosure, the support end face has a protruding portion which is an annular portion protruding along the axial direction of the filter from other portions on the support end face, and the protruding portion. May be supported by the housing as the first portion.

According to this, by forming the protrusion as described above on the support end face, the support end face can be supported by the housing by the protrusion, and the protrusion can be strongly contacted with the housing.

Further, in the gas generator of the present disclosure, the ignition portion is fixed to the second wall portion, and at least the other end surface of both end faces of the filter is the support end face, and the peripheral wall portion. Is formed on the side of the first wall portion and having the gas discharge hole formed in the tubular large-diameter portion, and on the side of the second wall portion and having a diameter smaller than that of the large-diameter portion. A support portion that includes a cylindrical small-diameter portion and an annular connecting portion that connects the large-diameter portion and the small-diameter portion, and supports the other end surface of the filter in the housing is the connecting portion. May be included in.

In a gas generator, the combustion gas flows toward the gas discharge hole, so most of the combustion gas that passes through the filter passes through the part of the filter near the gas discharge hole and the part farther from the gas discharge hole. The amount of combustion gas produced tends to be small. Therefore, in a gas generator in which a gas discharge hole is formed on the first wall side of the peripheral wall portion, when the filter is provided from the first wall portion to the second wall portion, the filter is far from the gas discharge hole. The portion near the two walls is a portion where the combustion gas does not pass so much and does not contribute much to the cooling and filtration of the combustion gas. On the other hand, in the gas generator of the present disclosure, the support portion that supports the other end surface of the filter is included in the connection portion located between the first wall portion and the second wall portion in the axial direction of the peripheral wall portion. .. That is, the filter does not extend to the vicinity of the second wall portion through which the combustion gas does not pass much. Therefore, according to such a gas generator, the filter can be used more efficiently as compared with the case where the filter is provided from the first wall portion to the second wall portion. That is, the filter can be made compact while sufficiently ensuring the cooling / filtering function of the combustion gas, which can contribute to the reduction in weight and cost of the filter.

Further, in the gas generator of the present disclosure, the other end surface of the filter has a housing such that a groove opened in the radial direction of the filter is formed between the second portion and the connection portion. May be supported by.

According to this, by forming a groove that opens in the radial direction of the filter, when the combustion gas flows toward the gas discharge hole, the residue of the combustion gas can be collected in the groove. Thereby, the collection performance of the combustion residue can be improved.

Further, in the above gas generator, the inner peripheral surface of the filter may be located radially inside the small diameter portion with respect to the inner peripheral surface of the small diameter portion.

According to this, the other end surface of the filter protrudes inward in the radial direction from the small diameter portion of the peripheral wall portion, and the residue of the combustion gas is easily captured by the other end surface and the groove of the filter. That is, the other end surface and the groove of the filter can be used more effectively in collecting the residue of the combustion gas.

Further, in the gas generator of the present disclosure, a tubular inner cylinder member is arranged in the combustion chamber so as to surround the ignition portion, so that the gas generator is burned by the operation of the ignition portion. A firebox in which the combustion charge to be burned is housed is formed between the ignition portion and the inner cylinder member, and the inner cylinder member has the inside and the outside of the firebox at least when the ignition portion is operated. A communication hole is formed to communicate with the filter, and the communication hole may be located between the second wall portion and the other end surface of the filter in the axial direction of the filter.

The gas generating agent is ignited by the combustion gas of the gunpowder ejected from the communication hole. Therefore, since the communication hole is located between the second wall portion and the other end surface of the filter, the gas generating agent in the combustion chamber is first located between the second wall portion and the other end surface of the filter. Burn. As a result, the flow of the combustion gas is formed so that the combustion gas of the gas generating agent flows into the groove. As a result, the residue of the combustion gas can be easily collected.

Further, in the gas generator of the present disclosure, both end faces in the axial direction of the filter may be the support end faces.

That is, both one end surface and the other end surface of the filter may be partially supported by the housing, and the contact state with the housing may be formed in an annular shape along the circumferential direction of the filter. According to this, it is possible to prevent the formation of a gap between the both end surfaces of the filter and the housing, and it is possible to suppress the short path more effectively.

In addition, the technology of the present disclosure can be grasped from the aspect of the method of assembling the gas generator. That is, the technique of the present disclosure is a combustion chamber in which an ignition unit and a gas generating agent burned by the operation of the ignition unit are arranged, a housing defining the combustion chamber, a tubular peripheral wall portion, and the said. A first wall portion provided on one end side of the peripheral wall portion and a second wall portion provided on the other end side of the peripheral wall portion are included, and the peripheral wall portion includes the combustion chamber and the outside of the housing. A housing having a communicating gas discharge hole and a tubular filter, which are arranged between the gas generator and the gas discharge hole in the combustion chamber so as to surround the gas generator. A method for assembling a gas generator, comprising a filter having one end surface in the axial direction supported by the housing on the side of the first wall portion and the other end surface supported by the housing on the side of the second wall portion. The gas generator is prepared with a housing component that forms a part of the housing and supports at least one of the axially both end faces of the filter, and the filter. Then, the first portion, which is a part of the support end face, contacts the housing and presses the housing, and the second portion, which is a portion other than the first portion, is separated from the housing. Gas generation includes assembling the filter to the housing component so that the contact state between the first portion of the support end surface and the housing is formed in an annular shape along the circumferential direction of the filter. This is the method of assembling the vessel.

Further, in the assembly method of the present disclosure, the support portion that supports the support end surface in the housing component is inclined so as to reduce the diameter in the gas generator in the axial direction of the filter as the distance from the filter increases. In assembling the filter to the housing component, the support end surface is supported by the housing with the outer peripheral edge of the support end surface as the first portion, and the contact state between the outer peripheral edge of the support end surface and the housing is the filter. The filter may be assembled to the housing component so as to be formed in an annular shape along the circumferential direction of the filter.

Further, in the assembly method of the present disclosure, the support end face has a protruding portion protruding along the axial direction of the filter from other parts of the support end face, and in assembling the filter to the housing component, the filter is assembled. The filter is provided so that the support end surface is supported by the housing with the protrusion as the first portion, and the contact state between the protrusion and the housing is formed in an annular shape along the circumferential direction of the filter. It may be assembled to the housing component.

According to the present disclosure, in a gas generator provided with a filter, a short path of combustion gas can be suppressed more effectively.

It is sectional drawing in the axial direction of the gas generator which concerns on Embodiment 1. FIG. It is an enlarged view of the vicinity of the contact point between the lower end surface of the filter and the annular wall portion of the housing in FIG. FIG. 5 is an end view of the filter in the gas generator according to the first embodiment as viewed from the lower end surface side. It is a flowchart of the assembly method of the gas generator which concerns on Embodiment 1. FIG. It is a figure (1) for demonstrating the assembly process of the filter which concerns on Embodiment 1. FIG. It is a figure (2) for demonstrating the assembly process of the filter which concerns on Embodiment 1. FIG. It is an axial sectional view of the gas generator which concerns on the modification 1 of Embodiment 1. FIG. It is an axial sectional view of the gas generator which concerns on the modification 2 of Embodiment 1. FIG. 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. FIG. 5 is an end view of the filter in the gas generator according to the second embodiment as viewed from the lower end surface side. 12 (A) and 12 (B) are diagrams for explaining an example of a method for manufacturing a filter according to the second embodiment. It is sectional drawing in the axial direction of the gas generator which concerns on Embodiment 3. FIG. It is a figure which shows the modification of the support of a filter.

The gas generator according to the embodiment of the present disclosure will be described below with reference to the drawings. It should be noted that each configuration and a combination thereof in each embodiment are examples, and the configurations can be added, omitted, replaced, and other changes as appropriate without departing from the gist of the present invention. The present invention 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, for example, an airbag gas generator used for airbags.

[overall structure]
As shown in FIG. 1, the gas generator 100 includes an ignition device 4, an inner cylinder member 5, a filter 6, a gunpowder 110, a gas generator 120, and a housing 1 for accommodating them. There is. The gas generator 100 is configured as a so-called single type gas generator provided with only one ignition device. Further, the gas generator 100 burns the gas generator 120 by operating the igniter 41 included in the ignition device 4, and the gas discharge hole 11 formed in the housing 1 with the combustion gas which is the combustion product thereof. It is configured to emit from. Hereinafter, each configuration of the gas generator 100 will be described. In this specification, the operation of the igniter included in the ignition device (ignition unit) is expressed as "the gas generator operates" or "the ignition device (ignition unit) operates" for convenience. There is.

[housing]
The housing 1 is a member that defines a combustion chamber 10, which is a space in which the ignition device 4, the inner cylinder member 5, the filter 6, the explosive agent 110, and the gas generating agent 120 are arranged. 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, with their open ends facing 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 vertical direction of the gas generator 100, the upper shell 2 side (that is, the upper side in FIG. 1) is the upper side of the gas generator 100, and the lower shell 3 side (that is, that is). , The lower side in FIG. 1) is the lower side of the gas generator 100.

The upper shell 2 is a component that forms a part of the housing 1 in the gas generator 100 and supports the upper end surface 61 of the filter 6. 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 an internal space is formed by these. An opening of the upper shell 2 is formed by the lower end portion of the upper peripheral wall portion 21. A joint portion 23 extending radially outward is connected to the lower end portion of the upper peripheral wall portion 21. The lower shell 3 is a component that forms a part of the housing 1 in the gas generator 100 and supports the lower end surface 62 of the filter 6. The lower shell 3 has a tubular lower peripheral wall portion 31 and a bottom plate portion 32 that closes the lower end of the lower peripheral wall portion 31 and to which the ignition device 4 is fixed, thereby forming an internal space. An opening of the lower shell 3 is formed by the upper end portion of the lower peripheral wall portion 31. A joint portion 33 extending radially outward is connected to the upper end portion of the lower peripheral wall portion 31. The lower shell 3 corresponds to the "housing component" according to the present disclosure.

The joint portion 23 of the upper shell 2 and the joint portion 33 of the lower shell 3 are overlapped and joined by laser welding or the like to form a short cylindrical housing 1 in which both ends in the axial direction are closed. The upper shell 2 and the lower shell 3 are joined only at the joint portions 23 and 33. 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 tubular peripheral wall portion 12 that connects the top plate portion 22 and the bottom plate portion 32. That is, the housing 1 includes a tubular 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 and to which the ignition device 4 is fixed. It is configured to include. The combustion chamber 10 is defined by the top plate portion 22, the bottom plate portion 32, and the peripheral wall portion 12. The top plate portion 22 corresponds to the “first wall portion” according to the present disclosure. Further, the bottom plate portion 32 corresponds to the “second wall portion” according to the present disclosure. Further, in the upper peripheral wall portion 21 of the peripheral wall portion 12, a plurality of gas discharge holes 11 communicating with the combustion chamber 10 and the external space of the housing 1 are formed side by side along the circumferential direction. The gas discharge hole 11 is closed by a sealing tape (not shown) before the ignition device 4 is activated.

Here, as shown in FIG. 1, the lower peripheral wall portion 31 of the lower shell 3 includes a first tubular wall portion 311 and a second tubular wall portion 312 and an annular wall portion 313. The first tubular wall portion 311 is a tubular portion including the upper end portion of the lower peripheral wall portion 31, and is formed to have substantially the same diameter as the upper peripheral wall portion 21. The second tubular wall portion 312 is a tubular portion including the lower end portion of the lower peripheral wall portion 31, and is formed to have a smaller diameter than the first tubular wall portion 311. The annular wall portion 313 is an annular portion that connects the lower end portion of the first tubular wall portion 311 and the upper end portion of the second tubular wall portion 312. That is, the annular wall portion 313 is located in the middle of the peripheral wall portion 12 in the axial direction of the peripheral wall portion 12, and is located between the top plate portion 22 and the bottom plate portion 32. Further, as shown in FIG. 1, the annular wall portion 313 is inclined so as to reduce its diameter toward the bottom plate portion 32 side. Here, among the peripheral wall portions 12, the configuration including the upper peripheral wall portion 21 and the first tubular wall portion 311 corresponds to the “large diameter portion” according to the present disclosure, and the second tubular wall portion 312 has a “small diameter portion”. The annular wall portion 313 corresponds to the "section" and corresponds to the "connection portion". That is, the large diameter portion is a portion of the peripheral wall portion 12, which is a tubular portion located on the top plate portion 22 side and in which the gas discharge hole 11 is formed. The small diameter portion is a portion of the peripheral wall portion 12, which is a tubular portion located on the bottom plate portion 32 side and having a diameter smaller than that of the large diameter portion. Further, the connecting portion is an annular portion connecting the large diameter portion and the small diameter portion. In this example, the large diameter portion is formed by the entire upper peripheral wall portion 21 and a part of the lower peripheral wall portion 31, and the small diameter portion and the connecting portion are formed by a part of the lower peripheral wall portion 31. However, the present disclosure is not limited to this. In the present disclosure, it is sufficient that the peripheral wall portion has a large diameter portion, a small diameter portion, and a connecting portion. For example, the large diameter portion is formed only by the upper peripheral wall portion 21, and the small diameter portion and the connecting portion are on the lower side. It may be formed only by the peripheral wall portion 31.

[Ignition system]
As shown in FIG. 1, the ignition device 4 includes an igniter 41, a collar 42, and a resin portion 43, and is fixed to a bottom plate portion 32 of the lower shell 3. The ignition device 4 corresponds to the "ignition unit" according to the present disclosure. The igniter 41 has a metal cup body 411 containing an igniter and a pair of energizing pins 421 and 412 for receiving an electric current supply from the outside. The igniter 41 is operated by the ignition current supplied to the pair of energizing pins 421 and 412 to burn the igniter and release the combustion product to the outside of the cup body 411. The collar 42 is a member that supports the igniter 41. The collar 42 is formed in a tubular shape, and is fixed by welding or the like in a state of being press-fitted into a mounting hole 32a formed in the bottom plate portion 32. The resin portion 43 is a resin member that fixes the igniter 41 to the collar 42 by being interposed between the igniter 41 and the collar 42. The resin portion 43 covers the lower portion of the igniter 41 and engages with the collar 42 so that at least a part of the cup body 411 is exposed from the resin portion 43. To fix. However, the entire cup body 411 may be overmolded by the resin portion 43. That is, the entire cup body 411 may be covered with resin. Further, the resin portion 43 forms a connector insertion space inside the collar 42 into which a connector (not shown) for supplying electric power from an external power source can be inserted into a pair of energizing pins 421 and 412. The resin portion 43 covers and holds a part of the pair of energizing pins 421 and 412 so that the lower ends of the pair of energizing pins 421 and 412 are exposed in the connector insertion space. The resin portion 43 maintains the insulating property between the pair of energizing pins 421 and 412. The fixing of the igniter 41 and the collar 42 and the relationship between the collar 42 and the bottom plate portion 32 are not limited to FIG. 1, and known techniques can be used.

[Inner cylinder member]
The inner cylinder member 5 is a tubular member extending from the bottom plate portion 32 toward the top plate portion 22 so as to surround the ignition device 4. The inner cylinder member 5 is formed in a tubular shape in which one end (upper end) is closed and the other end (lower end) is open, and the collar 42 is fitted (press-fitted) into the lower end to be attached to the bottom plate portion 32. ing. The inner cylinder member 5 is arranged between the ignition device 4 and the gas generating agent 120, and between the inner cylinder member 5 and the ignition device 4, there is a fire transmission room 51 which is a space for accommodating the gunpowder 110. It is formed. The ignition charge 110 is burned by the operation of the igniter 41 to generate combustion gas and the like. Further, the inner cylinder member 5 is formed with a plurality of communication holes 52 for communicating the internal space (that is, the fire transmission room 51) and the external space. The communication hole 52 is closed by a sealing tape (not shown) before the ignition device 4 is activated, and when the ignition device 4 is activated, the sealing tape is torn by the pressure of the combustion gas, and the fire transmission room 51 The inside and the outside communicate. The communication hole 52 may communicate with the inside and the outside of the fire transmission room 51 at least when the ignition device 4 is operated, and may not be blocked by the sealing tape.

[filter]
The filter 6 is a tubular member made of a metal material and has a plurality of holes. As shown in FIG. 1, the filter 6 is arranged in the combustion chamber 10 so that the gas generating agent is located inside the filter 6 and the gas discharge hole 11 is located outside the filter 6. That is, the filter 6 is arranged between the gas generator 120 and the gas discharge hole 11 in the combustion chamber 10 so as to surround the gas generator 120. Both end faces in the axial direction of the filter 6 are formed as flat surfaces. Of the both end surfaces, one end surface (upper end surface indicated by reference numeral 61) is supported by the housing 1 on the upper shell 2 side, and the other end surface (lower end surface indicated by reference numeral 62) is supported by the housing 1 on the lower shell 3 side. There is. More specifically, the upper end surface 61 is supported by the top plate portion 22 of the upper shell 2, and the lower end surface 62 is supported by the annular wall portion 313 of the peripheral wall portion 12. A known sealing means may be arranged between the upper end surface 61 and the top plate portion 22. As a result, the axial direction of the filter 6 is parallel to the axial direction of the housing 1 (that is, the axial direction of the peripheral wall portion). In this example, the lower end surface 62 of the filter 6 corresponds to the “support end surface” according to the present disclosure. The filter 6 is supported by the housing 1 in a state where a load is applied in the axial direction.

The filter 6 according to this example has a multi-layer structure. The porous metal plates are stacked in the radial direction (wound in a plurality of layers) to form the filter 6. Examples of the porous metal plate used as the material of the filter 6 include expanded metal, lath metal, punching metal and the like. Since a plurality of holes are formed in the filter 6, the combustion gas of the gas generating agent 120 arranged in the combustion chamber 10 can pass through the filter 6. When the combustion gas passes through the filter 6, the filter 6 cools the combustion gas by taking heat of the combustion gas. Further, in addition to the above-mentioned combustion gas cooling function, the filter 6 also has a function of filtering the combustion gas by collecting the combustion residue contained in 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. As will be described later, other known filters can be used as the filter 6.

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

[Gas generator]
As the gas generator 120, a gas generator having a relatively low combustion temperature can be used. The combustion temperature of the gas generating agent 120 can be set in the range of 1000 to 1700 ° C. As such a gas generating agent 120, known ones containing, for example, guanidine nitrate (41% by weight), basic copper nitrate (49% by weight), a binder and additives can be used. Further, the gas generating agent 120 may have various shapes such as a granular shape, a pellet shape, a columnar shape, and a disc shape.

[motion]
Hereinafter, the operation of the gas generator 100 according to the first embodiment will be described. First, it will be described with reference to FIG. When the sensor (not shown) detects an impact, an ignition current is supplied to the pair of energizing pins 421 and 412 to operate the igniter 41. Then, the igniting agent contained in the cup body 411 of the igniter 41 burns, and the flame, high-temperature gas, or the like which is the combustion product thereof is released to the outside of the cup body 411. As a result, the fire-transmitting agent 110 housed in the fire-transmitting room 51 burns, and combustion gas is generated. The combustion gas of the transmission hole 110 breaks the sealing tape that has blocked the communication hole 52 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 gas generating agent 120, and the gas generating agent 120 is ignited. When the gas generating agent 120 burns, high-temperature and high-pressure combustion gas is generated in the combustion chamber 10. 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 gas generating agent 120 cooled and filtered by the filter 6 passes through the gap 13 and breaks the sealing tape blocking the gas discharge hole 11 and is discharged from the gas discharge hole 11 to the outside of the housing 1. .. The combustion gas of the gas generating agent 120 flows into an 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.

[Filter support]
As shown in FIG. 1, in the gas generator 100, the lower end surface 62 is annular so as to be divided into a portion in contact with the annular wall portion 313 and a portion separated from the annular wall portion 313 in the radial direction of the filter 6. It is supported by the wall portion 313. Reference numeral 62a shown in FIG. 1 indicates the outer peripheral edge of the lower end surface 62 of the filter 6. Further, reference numeral 62b indicates a portion of the lower end surface 62 excluding the outer peripheral edge 62a, that is, a portion inside the outer peripheral edge 62a, which is referred to as a non-outer peripheral portion. The outer peripheral edge 62a of the filter 6 corresponds to the "first site" according to the present disclosure. Further, the non-peripheral portion 62b of the filter 6 corresponds to the "second portion" according to the present disclosure. Further, reference numeral 313a indicates a surface of the annular wall portion 313 on the side defining the combustion chamber 10, and this is referred to as an annular wall surface. That is, the annular wall surface 313a is a surface that supports the lower end surface 62 of the filter 6 in the housing 1. The annular wall surface 313a corresponds to the "support portion" according to the present disclosure.

As shown in FIG. 1, the annular wall surface 313a is inclined so as to reduce its diameter as it is separated from the filter 6 in the axial direction of the filter 6. Therefore, the lower end surface 62 is supported by the annular wall portion 313 in a state where the outer peripheral edge 62a, which is a part thereof, is in contact with the annular wall portion 313 and the non-outer peripheral portion 62b is separated from the annular wall portion 313. ing. That is, the lower end surface 62 is supported by the housing 1 by the outer peripheral edge 62a which is a part of the lower end surface 62. Further, as described above, since the filter 6 is in a state where the load is applied in the axial direction by the housing 1, the outer peripheral edge 62a of the filter 6 presses the housing 1. The lower end surface 62 is supported by the annular wall portion 313 by the outer peripheral edge 62a, and the outer peripheral edge 62a presses the annular wall portion 313, so that the load is concentrated on the outer peripheral edge 62a. Therefore, the outer peripheral edge 62a of the lower end surface 62 comes into contact with the annular wall portion 313 more strongly than when the entire lower end surface 62 including the non-outer peripheral portion 62b is supported by the annular wall portion 313 (that is, the filter 6 is in contact with the annular wall portion 313). The load is concentrated on the outer peripheral edge 62a with respect to 313a). Here, FIG. 2 is an enlarged view of the vicinity of the contact portion between the lower end surface 62 of the filter 6 and the annular wall portion 313 of the housing 1 in FIG. As shown in FIG. 2, in the gas generator 100, the load is concentrated on the outer peripheral edge 62a of the lower end surface 62, so that the outer peripheral edge 62a bites into the annular wall portion 313. Here, when the outer peripheral edge 62a bites into the annular wall portion 313, it means that the outer peripheral edge 62a has entered the annular wall surface 313a even if the corner portion (the corner portion defined by the outer peripheral surface 64 and the lower end surface 62) is small. The state. In other words, it can be said that the annular wall portion 313 is slightly deformed so as to accept the corner portion of the outer peripheral edge 62a. At this time, the outer peripheral edge 62a that bites into the annular wall portion 313 does not have to be deformed. Further, FIG. 3 is an end view of the filter 6 in the gas generator 100 according to the first embodiment as viewed from the lower end surface side. In the gas generator 100, the outer peripheral edge 62a in contact with the annular wall portion 313 of the housing 1 is formed in an annular shape along the circumferential direction of the filter 6 as shown in FIG. Therefore, in the gas generator 100, the outer peripheral edge 62a of the lower end surface 62 and the annular wall portion 313 of the housing 1 come into contact with each other.
These contact states are formed in an annular shape along the circumferential direction of the filter 6. That is, the contact state between the lower end surface 62 of the filter 6 and the housing 1 is formed over the entire circumference of the lower end surface 62. There may be a difference between the hardness of the housing 1 (annular wall portion 313) and the hardness of the filter 6. For example, when the filter 6 is harder than the annular wall portion 313, in the state of FIG. 1, the outer peripheral edge 62a is in a state where the outer peripheral edge 62a bites into the annular wall portion 313 in an annular shape. On the contrary, when the annular wall portion 313 is harder than the filter 6, the outer peripheral edge 62a of the filter 6 is deformed even if it is slightly deformed, and the annular wall portion 313 comes into contact with the annular wall surface portion 313 in an increased contact area.

[Assembly method of gas generator]
Next, a method of assembling the gas generator according to the first embodiment will be described. However, the method of assembling the gas generator of the present disclosure is not limited to the following methods. FIG. 4 is a flowchart of a method of assembling the gas generator 100 according to the first embodiment. Hereinafter, description will be given with reference to FIG.

First, in the preparation step of step S101, the upper shell 2, the lower shell 3 (housing component), the ignition device 4, the inner cylinder member 5, and the filter 6 are prepared.

Next, in the step of attaching the ignition device in step S102, the ignition device 4 is attached to the lower shell 3. In step S102, the ignition device 4 is inserted through the opening of the lower shell 3. The ignition device 4 is fixed to the lower shell 3 by being welded to the bottom plate portion 32 in a state of being fitted into the mounting hole 32a.

Next, in the step of attaching the inner cylinder member in step S103, the inner cylinder member 5 is attached to the lower shell 3 to which the ignition device 4 is fixed. In step S103, the ignition device 4 (more specifically, the collar 42) is fitted (press-fitted) through the opening of the inner cylinder member 5 filled with the explosive gun 110 so as to surround the inner cylinder member 4. 5 is attached. As a result, the fire transmission room 51 is formed.

Next, in the filter assembly step of step S104, the filter 6 is assembled concentrically with respect to the lower shell 3 to which the inner cylinder member 5 is attached. 5 and 6 are diagrams for explaining the filter assembling step according to the first embodiment. In step S104, first, as shown in FIG. 5, the filter 6 is inserted through the opening of the lower shell 3, and the lower end surface 62 of the filter 6 is brought into contact with the annular wall portion 313 of the lower shell 3. Here, as described above, since the annular wall surface 313a of the annular wall portion 313 is inclined so as to reduce its diameter as it is separated from the filter 6 in the axial direction of the filter 6, it is below the filter 6 as shown in FIG. The end surface 62 is in a state in which the outer peripheral edge 62a is in contact with the annular wall surface 313a and the non-outer peripheral portion 62b is separated from the annular wall surface 313a. Further, the contact state between the outer peripheral edge 62a and the annular wall surface 313a is formed in an annular shape along the circumferential direction of the filter 6. In step S104, the inside of the filter 6 is then filled with the gas generating agent 120. In step S104, the housing 1 is then formed by attaching the upper shell 2 to the lower shell 3, as shown in FIG. The housing 1 is formed by joining the joint portion 23 and the joint portion 33 in a state where the opening of the upper shell 2 and the opening of the lower shell 3 face each other. At this time, in the housing 1, the contact portions of the upper shell 2 and the lower shell 3 are joined by a joining method (for example, welding or the like) suitable for moisture-proofing or the like of the gas generating agent filled inside. In step S104, the upper shell 2 is attached so that the top plate portion 22 of the upper shell 2 comes into contact with the upper end surface 61 of the filter 6. The filter 6 is sandwiched from both sides in the axial direction by the top plate portion 22 of the upper shell 2 and the annular wall portion 313 of the lower shell 3, and the outer peripheral edge 62a of the lower end surface 62 of the filter 6 holds the annular wall portion 313 of the housing 1. It will be in the pressed state. As described above, the lower end surface 62 of the filter 6 is supported by the annular wall portion 313, and the gas generator 100 is assembled.

[Action / Effect]
By the way, in a gas generator, when a gas generator is burned to generate combustion gas in a combustion chamber, a load acting on the filter in the radial direction is applied by the pressure of the combustion gas. If the end of the filter is separated from the housing by a load acting outward in the radial direction and a gap is formed between the end of the filter and the housing, a part of the combustion gas does not pass through the filter and passes through the gap. There is concern that it will reach the gas outlet hole through it. That is, there is a risk that a so-called "short pass" will occur.

On the other hand, in the gas generator 100, the lower end surface 62 of the filter 6 is in a state where the outer peripheral edge 62a, which is a part of the lower end surface 62, is in contact with the annular wall portion 313 of the housing 1 and presses the annular wall portion 313. The non-peripheral portion 62b, which is a portion of the lower end surface 62 excluding the outer peripheral edge 62a, is supported by the annular wall portion 313 in a state of being separated from the annular wall portion 313. The contact state between the outer peripheral edge 62a of the filter 6 and the annular wall portion 313 is formed in an annular shape along the circumferential direction of the filter 6.

According to this, by supporting the lower end surface 62 by the outer peripheral edge 62a and concentrating the load on the outer peripheral edge 62a, the outer peripheral edge 62a and the housing 1 can be strongly brought into contact with each other. In addition, by forming the contact state between the outer peripheral edge 62a and the housing 1 in an annular shape along the circumferential direction of the filter 6, the combustion gas can pass from the inner peripheral surface 63 side of the filter 6 to the outer peripheral surface 64 side. No gap is formed between the lower end surface 62 and the housing 1. As a result, according to the gas generator 100, the short path can be effectively suppressed.

Further, in the gas generator 100, by making the outer peripheral edge 62a of the filter 6 bite into the annular wall portion 313 of the housing 1, it is more difficult to form a gap, and the short path is effectively suppressed. As long as the contact state between the outer peripheral edge 62a of the lower end surface 62 and the annular wall portion 313 is formed over the entire circumference of the lower end surface 62, the outer peripheral edge 62a does not bite into the annular wall portion 313 of the housing 1. It is also good.

Further, in the gas generator 100, the annular wall surface 313a supporting the lower end surface 62 in the housing 1 is inclined so as to shrink in diameter as the distance from the filter 6 increases in the axial direction of the filter 6. As a result, the lower end surface 62 can be supported by the housing 1 by the outer peripheral edge 62a.

Here, in the gas generator, since the combustion gas flows toward the gas discharge hole, most of the combustion gas passing through the filter passes through the portion of the filter near the gas discharge hole and is far from the gas discharge hole. The amount of combustion gas that passes through the part tends to be small. Therefore, in a gas generator such as the gas generator 100 in which a gas discharge hole is formed on the top plate portion side of the peripheral wall portion, when the filter is provided from the top plate portion to the bottom plate portion, the gas is discharged from the filter. The portion near the bottom plate portion far from the hole is a portion where the combustion gas does not pass so much and does not contribute much to the cooling and filtration of the combustion gas.

On the other hand, in the gas generator 100, the lower end surface 62 is supported by the annular wall surface 313a included in the annular wall portion 313. As described above, the annular wall portion 313 is located between the top plate portion 22 and the bottom plate portion 32 in the axial direction of the peripheral wall portion 12. That is, the filter 6 whose lower end surface 62 is supported by the annular wall portion 313 is unevenly distributed on the top plate portion 22 side, and does not extend to the vicinity of the bottom plate portion 32 where the combustion gas does not pass so much. Therefore, in the gas generator 100, the filter 6 can be used more efficiently as compared with the case where the upper end surface of the filter is supported by the top plate portion and the lower end surface is supported by the bottom plate portion. That is, the filter can be made compact while sufficiently ensuring the cooling / filtering function of the combustion gas, which can contribute to the reduction in weight and cost of the filter.

Here, as shown in FIG. 1, in the gas generator 100, a groove indicated by reference numeral G1 is formed between the non-peripheral portion 62b and the annular wall portion 313 while the outer peripheral edge 62a is in contact with the annular wall portion 313. As described above, the lower end surface 62 of the filter 6 is supported by the housing 1. The groove G1 is annularly opened inward in the radial direction of the filter 6. Therefore, when the combustion gas flows toward the gas discharge hole 11, the residue of the combustion gas tends to accumulate in the groove G1. Thereby, the collection performance of the combustion residue can be improved.

Further, as shown in FIG. 1, the inner cylinder member 5 of the gas generator 100 is formed with a communication hole 52 that communicates between the inside and the outside of the fire transmission room 51 at least when the ignition device 4 is operated. The hole 52 is located between the bottom plate portion 32 and the lower end surface 62 of the filter 6 in the axial direction of the filter 6. The gas generating agent 120 is ignited by the combustion gas of the transmission agent 110 ejected from the communication hole 52. Therefore, since the communication hole 52 is located between the bottom plate portion 32 and the lower end surface 62 of the filter 6, the gas generating agent 120 in the combustion chamber 10 is located between the bottom plate portion 32 and the lower end surface 62 of the filter 6. It burns first from the one that is located. As a result, the combustion gas of the gas generating agent 120 flows from the bottom plate portion 32 toward the top plate portion 22. As a result, the groove G1 in the middle functions as a residue collecting pocket, and the residue of the combustion gas is easily collected. The inner cylinder member 5 may have a communication hole at another position in addition to the communication hole 52 shown in FIG.

Further, a compression molding filter as disclosed in Japanese Patent Application Laid-Open No. 10-119705 and a winding filter as disclosed in Japanese Patent Application Laid-Open No. 11-348712 are used as the filter 6, and the annular wall portion is formed by the outer peripheral edge 62a. The filter 6 may be arranged so that the non-peripheral portion 62b and the annular wall portion 313 form the groove G1 by strongly pressing the 313 to deform it.

[Modification of Embodiment 1]
Hereinafter, the gas generator according to the modified example of the first embodiment will be described. In the description of the modified example, the differences from the gas generator 100 described with reference to FIGS. 1 to 6 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 description thereof will be omitted. do.

[Modification 1 of Embodiment 1]
FIG. 7 is an axial sectional view of the gas generator 100A according to the first modification of the first embodiment. FIG. 7 shows the state of the gas generator 100A before operation. As shown in FIG. 7, in the gas generator 100A, the inner peripheral surface 63 of the filter 6 has a diameter of the second tubular wall portion 312 rather than the inner peripheral surface 312a of the second tubular wall portion 312 of the lower peripheral wall portion 31. The filter 6 is supported by the housing 1 so as to be located inward in the direction. According to this, the lower end surface 62 of the filter 6 protrudes radially inward from the second tubular wall portion 312 of the lower peripheral wall portion 31, and the residue of the combustion gas is formed on the lower end surface 62 and the groove G1 of the filter 6. It becomes easy to be supplemented. That is, the lower end surface 62 of the filter 6 can be used more effectively in collecting the residue of the combustion gas.

[Modification 2 of Embodiment 1]
FIG. 8 is an axial sectional view of the gas generator 100B according to the second modification of the first embodiment. FIG. 8 shows the state before the operation of the gas generator 100B. In the gas generator 100B, both the upper end surface 61 and the lower end surface 62 of the filter 6 correspond to the "support end surface" according to the present disclosure.

As shown in FIG. 8, in the gas generator 100B, similarly to the gas generator 100, the outer peripheral edge 62a is in contact with the annular wall portion 313 of the housing 1 and presses the annular wall portion 313, and is not the outer periphery. The lower end surface 62 of the filter 6 is supported by the annular wall portion 313 in a state where the portion 62b is separated from the annular wall portion 313. Further, the contact state between the outer peripheral edge 62a of the filter 6 and the annular wall portion 313 is formed in an annular shape along the circumferential direction of the filter 6. Further, in the gas generator 100B, the upper end surface 61 of the filter 6 is also supported by the housing 1 by the outer peripheral edge 61a which is a part thereof.

As shown in FIG. 8, the top plate portion 22B of the gas generator 100B includes a top wall portion 221 and an inclined wall portion 222. The top wall portion 221 is a portion that defines the upper end of the combustion chamber 10, and extends in the radial direction of the filter 6 so as to be orthogonal to the axial direction of the filter 6. The inclined wall portion 222 is an annular portion that supports the upper end surface 61 of the filter 6, is connected to the upper peripheral wall portion 21, and is inclined so as to be reduced in diameter as it is separated from the filter 6 in the axial direction of the filter 6.

Reference numeral 61a shown in FIG. 8 indicates the outer peripheral edge of the upper end surface 61 of the filter 6. Further, reference numeral 61b indicates a non-peripheral portion which is a portion of the upper end surface 61 excluding the outer peripheral edge 61a. Further, reference numeral 222a indicates a surface of the inclined wall portion 222 on the side defining the combustion chamber 10, and this is referred to as an inclined wall surface. The inclined wall surface 222a of the inclined wall portion 222 corresponds to the "support portion" according to the present disclosure. The inclined wall surface 222a is inclined so as to reduce its diameter as the distance from the filter 6 increases in the axial direction of the filter 6. Therefore, the upper end surface 61 is in a state in which the outer peripheral edge 61a, which is a part thereof, contacts the inclined wall portion 222 and presses the inclined wall portion 222, and the non-outer peripheral portion 61b is separated from the inclined wall portion 222. , Supported by housing 1. The contact state between the outer peripheral edge 61a of the filter 6 and the inclined wall portion 222 is formed in an annular shape along the circumferential direction of the filter 6.

According to the gas generator 100B, similarly to the gas generator 100, no gap is formed between the lower end surface 62 and the housing 1. Further, according to the gas generator 100B, the upper end surface 61 is supported by the outer peripheral edge 61a, the load is concentrated on the outer peripheral edge 61a, the outer peripheral edge 61a and the housing 1 (inclined wall portion 222) are strongly brought into contact with each other, and the outer peripheral edge 61a is brought into strong contact with the outer peripheral edge 61a. By forming the contact state between the peripheral edge 61a and the housing 1 in an annular shape along the circumferential direction of the filter 6, a gap is not formed between the upper end surface 61 and the housing 1.

That is, according to the gas generator 100B, it is possible to prevent a gap from being formed between the gas generator 100B and the housing 1 on both end faces of the filter 6. As a result, according to the gas generator 100B, the short path can be suppressed more effectively.

[Modification 3 of Embodiment 1]
FIG. 9 is an axial sectional view of the gas generator 100C according to the third modification of the first embodiment. FIG. 9 shows the state before the operation of the gas generator 100C. The gas generator 100C is mainly different from the gas generator 100 in that the lower end surface 62 of the filter 6 is supported not by a part of the peripheral wall portion but by a part of the bottom plate portion.

As shown in FIG. 9, the gas generator 100C peripheral wall portion 12C does not have the annular wall portion 313 and has the same diameter from the top plate portion 22 to the bottom plate portion 32C. Further, the bottom plate portion 32C of the gas generator 100C includes a bottom wall portion 321 and an inclined wall portion 322. The bottom wall portion 321 is a portion that defines the lower end of the combustion chamber 10, and extends in the radial direction of the filter 6 so as to be orthogonal to the axial direction of the filter 6. The inclined wall portion 322 is an annular portion that supports the lower end surface 62 of the filter 6, is connected to the lower peripheral wall portion 31, and is inclined so as to be reduced in diameter as it is separated from the filter 6 in the axial direction of the filter 6.

Reference numeral 322a shown in FIG. 9 indicates a surface of the inclined wall portion 322 on the side defining the combustion chamber 10, and this is referred to as an inclined wall surface. The inclined wall surface 322a of the inclined wall portion 322 corresponds to the “support portion” according to the present disclosure. The inclined wall surface 322a is inclined so as to reduce its diameter as the distance from the filter 6 increases in the axial direction of the filter 6.

According to the gas generator 100C, similarly to the gas generator 100, a gap is not formed between the lower end surface 62 and the housing 1, and the short path can be effectively suppressed.

<Embodiment 2>
FIG. 10 is an axial sectional view of the gas generator 200 according to the second embodiment. FIG. 10 shows the state of the gas generator 200 before operation. Hereinafter, the gas generator 200 according to the second embodiment will be described focusing on the differences from the gas generator 100 according to the first embodiment, and the same points as the gas generator 100 will be described in detail by adding the same reference numerals. I will omit the explanation.

As shown in FIG. 10, the lower end surface 62 of the filter 6D of the gas generator 200 has a protruding portion 62c which is an annular portion protruding along the axial direction of the filter 6D from other portions on the lower end surface 62. The portion of the lower end surface 62 other than the protruding portion 62c is referred to as a non-protruding portion and is indicated by reference numeral 62d. The protruding portion 62c of this example is formed by projecting the outermost layer of the multilayer layers constituting the filter 6D in the axial direction of the filter 6D more than the other layers. However, the protrusion in the example of FIG. 10 does not have to be formed in the outermost layer of the filter, and may be formed in, for example, an intermediate layer. The protruding portion 62c of the filter 6D corresponds to the "first site" according to the present disclosure. Further, the non-protruding portion 62d of the filter 6D corresponds to the “second portion” according to the present disclosure.

Further, as shown in FIG. 10, the annular wall surface 313a of the annular wall portion 313D of the peripheral wall portion 12 supporting the lower end surface 62 of the filter 6D is a flat surface without being inclined, and is orthogonal to the axial direction of the filter 6D. As such, it extends in the radial direction of the filter 6D.

In the filter 6D, since the protruding portion 62c protrudes in the axial direction on the lower end surface 62, as shown in FIG. 10, the protruding portion 62c is in contact with the annular wall portion 313D of the housing 1 and presses the annular wall portion 313D. In addition, the lower end surface 62 of the filter 6D is supported by the annular wall portion 313D in a state where the non-protruding portion 62d is separated from the annular wall portion 313D. Therefore, the load is concentrated on the protruding portion 62c, and the protruding portion 62c strongly contacts the annular wall portion 313D. In the gas generator 200, the load is concentrated on the protruding portion 62c of the lower end surface 62, so that the protruding portion 62c bites into the annular wall portion 313D. Here, the fact that the protruding portion 62c bites into the annular wall portion 313D means that the protruding portion 62c has penetrated into the annular wall surface 313a even if it is slight. In other words, it can be said that the annular wall portion 313D is slightly deformed so as to accept the protrusion 62c. Here, FIG. 11 is an end view of the filter 6D in the gas generator 200 according to the second embodiment as viewed from the lower end surface side. In the gas generator 200, the protruding portion 62c that contacts the annular wall portion 313D of the housing 1 is formed in an annular shape along the circumferential direction of the filter 6D as shown in FIG. Therefore, in the gas generator 200, the protruding portion 62c of the lower end surface 62 and the annular wall portion 313D of the housing 1 come into contact with each other, so that these contact states are formed in an annular shape along the circumferential direction of the filter 6D.

According to such a gas generator 200, similarly to the gas generator 100, a gap is not formed between the lower end surface 62 and the housing 1, and a short path can be effectively suppressed.

Further, also in the gas generator 200, by making the protruding portion 62c of the filter 6D bite into the annular wall portion 313D of the housing 1, it is more difficult to form a gap, and the short path is effectively suppressed. As long as the protruding portion 62c of the lower end surface 62 and the annular wall portion 313D are formed in contact with each other over the entire circumference of the lower end surface 62, the protruding portion 62c does not bite into the annular wall portion 313D of the housing 1. It is also good. Further, the annular wall portion to be combined with the filter 6D may be the inclined annular wall portion 313 shown in FIG. 1 or the like.

12 (A) and 12 (B) are diagrams for explaining an example of a method for manufacturing the filter 6D according to the second embodiment. The filter 6D can be manufactured, for example, by winding the porous metal plate 60 shown in FIG. 12 (A) as shown in FIG. 12 (B). As shown in FIG. 12 (A), the porous metal plate 60 is formed in a long shape, and in the longitudinal direction thereof, the main body portion 601 located on one end side and the main body portion 601 located on the other end side thereof are larger than the main body portion 601. It is partitioned into a wide portion 602 having a large width. The wide portion 602 is a portion that becomes the outermost layer in the filter 6D. By winding the perforated metal plate 60 from the main body portion 601 as shown in FIG. 12B, a filter 6D having a protruding portion 62c is manufactured.

The method of assembling the gas generator 200 is substantially the same as the method of assembling the gas generator 100 described with reference to FIG. In the method of assembling the gas generator 200, in the filter assembling step of step S104, the lower end surface 62 is supported by the annular wall portion 313D by the protruding portion 62c, and the contact state between the protruding portion 62c and the annular wall portion 313D is the contact state of the filter 6D. The filter 6D is assembled to the lower shell 3 so as to form an annular shape along the circumferential direction.

<Embodiment 3>
FIG. 13 is an axial sectional view of the gas generator 300 according to the third embodiment. FIG. 13 shows the state of the gas generator 300 before operation. Hereinafter, the gas generator 300 according to the third embodiment will be described focusing on the differences from the gas generator 100 according to the first embodiment, and the same points as the gas generator 100 will be described in detail by adding the same reference numerals. I will omit the explanation.

As shown in FIG. 13, the gas generator 300 includes a first ignition device 4X, a second ignition device 4Y, an inner cylinder member 5E, a filter 6, a gunpowder 110, a first gas generator 120X, and the like. A second gas generator 120Y and a housing 1E for accommodating the second gas generator 120Y are provided. The gas generator 300 is configured as a so-called dual type gas generator provided with two ignition devices. In the gas generator 300, the first ignition device 4X corresponds to the "ignition unit" according to the present disclosure. Further, the gas generator 300 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 is produced. The combustion gas is configured to be discharged from the gas discharge hole 11. In the gas generator 300, the second igniter 4Y operates independently of the first igniter 4X, and when it operates, it operates at a predetermined timing after the first igniter 4X operates. ..

As shown in FIG. 13, the housing 1E according to the third embodiment separates the internal space of the housing 1E into the first combustion chamber 10X and the second combustion chamber 10Y, and abuts and supports the lower end surface 62 of the filter 6. It has a partition wall portion 14. The partition wall portion 14 is provided between the top plate portion 22E and the bottom plate portion 32 in the axial direction of the filter 6. That is, the partition wall portion 14 is provided on the other end side of the peripheral wall portion 12 with respect to the top plate portion 22E provided on one end side of the peripheral wall portion 12. The first combustion chamber 10X is defined by the top plate portion 22E, the partition wall portion 14, and the peripheral wall portion 12. Further, the second combustion chamber 10Y is defined by the partition wall portion 14, the bottom plate portion 32, and the peripheral wall portion 12. In the gas generator 300, the top plate portion 22E corresponds to the "first wall portion" according to the present disclosure, and the partition wall portion 14 corresponds to the "second wall portion" according to the present disclosure. The first combustion chamber 10X contains a first gas generating agent 120X that burns by the operation of the first ignition device 4X, and the second combustion chamber 10Y generates a second gas that burns by the operation of the second ignition device 4Y. Agent 120Y is contained. The first combustion chamber 10X corresponds to the "combustion chamber" according to the present disclosure, and the first gas generating agent 120X corresponds to the "gas generating agent" according to the present disclosure.

The partition wall portion 14 includes a split wall portion 141, a fitting wall portion 142, and a terminal portion 143. The dividing wall portion 141 is a portion that defines the lower end of the first combustion chamber 10X, and extends in the radial direction of the filter 6 so as to be orthogonal to the axial direction of the filter 6. A through hole 14a, which is a hole through which the inner cylinder member 5E penetrates, is formed in the divided wall portion 141. The fitting wall portion 142 is a tubular portion that fits into the lower peripheral wall portion 31 of the lower shell 3, and is an internal side of the first combustion chamber 10X from the peripheral edge of the divided wall portion 141 along the axial direction of the filter 6. (Ie, it extends upward). The terminal portion 143 is an annular portion placed on the upper end of the lower peripheral wall portion 31 of the lower shell 3, and extends radially outward from the upper end of the fitting wall portion 142.

The inner cylinder member 5E according to the third embodiment extends from the bottom plate portion 32 toward the top plate portion 22E so as to surround the first ignition device 4X fixed to the bottom plate portion 32, and penetrates the through hole 14a of the partition wall portion 14. However, its end is open. Therefore, the space inside the inner cylinder member 5E is included in the first combustion chamber 10X, and the first ignition device 4X is arranged in the first combustion chamber 10X. Further, inside the inner cylinder member 5E, a partition member P1 for partitioning the internal space vertically is arranged. As a result, of the internal space of the inner cylinder member 5, the space below the partition member P1 (on the side of the first ignition device 4X) is formed as the fire transmission room 51. The fire-transmitting agent 110 is housed in the fire-transmitting room 51 without being mixed with the first gas generating agent 120X. The partition member P1 is made of a material that is rapidly burned, melted, or extinguished by the combustion gas of the gunpowder 110 so as not to prevent the ignition of the first gas generating agent 120X by the combustion gas of the gunpowder 110. Further, the inner cylinder member 5E is formed with a plurality of communication holes 52 that communicate the internal space of the inner cylinder member 5E (by extension, the first combustion chamber 10X) and the second combustion chamber 10Y. The communication hole 52 is closed by a sealing tape (not shown) before the second ignition device 4Y is operated.

As shown in FIG. 13, in the gas generator 300, the upper end surface 61 of the filter 6 abuts on the top plate portion 22E and is supported, and the lower end surface 62 abuts on the divided wall portion 141 of the partition wall portion 14 and is supported. As such, it is arranged in the first combustion chamber 10X. Further, the top plate portion 22E of the gas generator 300 includes a top wall portion 221 and an inclined wall portion 222. The top wall portion 221 is a portion that defines the upper end of the first combustion chamber 10X, and extends in the radial direction of the filter 6 so as to be orthogonal to the axial direction of the filter 6. The inclined wall portion 222 is an annular portion that supports the upper end surface 61 of the filter 6. The inclined wall surface 222a, which is the surface of the inclined wall portion 222 on the side that defines the first combustion chamber 10X, is connected to the upper peripheral wall portion 21 and is inclined so as to be reduced in diameter as it is separated from the filter 6 in the axial direction of the filter 6. There is.

Therefore, the upper end surface 61 of the filter 6 is in a state where the outer peripheral edge 61a, which is a part thereof, contacts the inclined wall portion 222 and presses the inclined wall portion 222, and the non-outer peripheral portion 61b is separated from the inclined wall portion 222. In this state, it is supported by the housing 1E. The contact state between the outer peripheral edge 61a of the filter 6 and the inclined wall portion 222 is formed in an annular shape along the circumferential direction of the filter 6.

When such a gas generator 300 is activated, first, the first ignition device 4X is activated, the combustion charge 110 housed 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 1E. Next, the second ignition device 4Y operates, the second gas generating agent 120Y housed 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 that blocked the communication hole 52, flows from the communication hole 52 into the first combustion chamber 10X, passes through the filter 6, and passes through the gas discharge hole 11 to the housing 1E. It is released to the outside.

According to the gas generator 300 according to the third embodiment, the upper end surface 61 is supported by the outer peripheral edge 61a, the load is concentrated on the outer peripheral edge 61a, and the outer peripheral edge 61a and the housing 1E (inclined wall portion 222) are strongly brought into contact with each other. Further, by forming the contact state between the outer peripheral edge 61a and the housing 1E in an annular shape along the circumferential direction of the filter 6, a gap is not formed between the upper end surface 61 and the housing 1E. As a result, according to the gas generator 300, the short path can be effectively suppressed.

<Other Examples>
FIG. 14 is a diagram showing a modified example of the support of the filter. FIG. 14 shows a case where a modified example of the support of the filter is applied to the gas generator 100C shown in FIG. As shown in FIG. 14, the lower end surface 62 of the filter 6 may be supported by the R wall portion 322C having R (curvature) instead of the inclined wall portion 322. The R wall portion 322C is an annular portion that connects the lower peripheral wall portion 31 and the bottom wall portion 321 and has an arc shape in a cross section orthogonal to the peripheral length direction. The R wall surface 322Ca, which is the side surface of the R wall portion 322C that defines the combustion chamber 10, is curved so as to shrink in diameter as the distance from the filter 6 increases in the axial direction of the filter 6. Therefore, the lower end surface 62 is in a state in which the outer peripheral edge 62a, which is a part thereof, contacts the R wall portion 322C and presses the R wall portion 322C, and the non-outer peripheral portion 62b is separated from the R wall portion 322C. , Supported by housing 1. At this time, the contact state between the outer peripheral edge 62a of the lower end surface 62 of the filter 6 and the R wall portion 322C is formed in an annular shape along the circumferential direction of the filter 6. A groove G1 is formed between the non-peripheral portion 62b and the R wall portion 322C.

Such a configuration in which the filter is supported by the R portion can be applied to any of the examples shown in FIGS. 1, 7 to 10 and 13. For example, in the gas generator shown in FIG. 10, an R wall portion is formed between the first tubular wall portion 311 and the annular wall portion 313D, and the protruding portion 62c of the lower end surface 62 of the filter 6D is strongly strengthened at the R portion. A gap G1 may be formed between the non-protruding portion 62d and the annular wall portion 313D by hitting and supporting the portion.

<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.

100,200,300 Gas generator 1 Housing 11 Gas discharge hole 12 Peripheral wall part 14 Partition wall part (example of second wall part)
2 Upper shell 22 Top plate (an example of the first wall)
222 Inclined wall 3 Lower shell 312 Circular wall (example of connection)
32 Bottom plate (an example of the second wall)
322 Inclined wall part 4 Ignition device (example of ignition part)
5 Inner cylinder member 6 Filter 61 Upper end surface (one end surface of filter)
62 Lower end surface (the other end surface of the filter)
62a Outer peripheral edge (an example of the first part)
62b Non-peripheral part (an example of the second part)
62c Protruding part (an example of the first part)
62d Non-protruding part (an example of the second part)
10 Combustion chamber 120 Gas generator

Claims (11)

A combustion chamber in which an ignition unit and a gas generating agent that burns by the operation of the ignition unit are arranged, and
A housing that defines the combustion chamber, that is, a tubular peripheral wall portion, a first wall portion provided on one end side of the peripheral wall portion, and a second wall portion provided on the other end side of the peripheral wall portion. , And a housing in which a gas discharge hole for communicating the combustion chamber and the outside of the housing is formed in the peripheral wall portion.
A tubular filter, which is arranged between the gas generator and the gas discharge hole in the combustion chamber so as to surround the gas generator, and one end surface in the axial direction thereof is the first wall. A filter supported by the housing on the side of the portion and the other end surface supported by the housing on the side of the second wall portion.
It is a gas generator equipped with
The support end face, which is at least one of both end faces in the axial direction of the filter, is in a state where the first portion, which is a part of the support end face, contacts the housing and presses the housing, and the support end face. The second portion, which is a portion other than the first portion, is supported by the housing in a state of being separated from the housing.
The contact state between the first portion of the support end surface and the housing is formed in an annular shape along the circumferential direction of the filter.
Gas generator. The support portion that supports the support end surface in the housing is inclined so as to reduce the diameter as the distance from the filter increases in the axial direction of the filter.
The support end face is supported by the housing with its outer peripheral edge as the first portion.
The gas generator according to claim 1. The support end surface has a protruding portion which is an annular portion protruding along the axial direction of the filter from other portions on the support end surface, and the protruding portion is used as the first portion to support the housing. Has been
The gas generator according to claim 1 or 2. The ignition portion is fixed to the second wall portion.
At least the other end surface of both end faces of the filter is the support end surface.
The peripheral wall portion is located on the side of the first wall portion and has a large diameter tubular portion on which the gas discharge hole is formed, and is located on the side of the second wall portion and has a smaller diameter than the large diameter portion. Includes a tubular small-diameter portion formed in the above and an annular connecting portion that connects the large-diameter portion and the small-diameter portion.
A support portion that supports the other end surface of the filter in the housing is included in the connection portion.
The gas generator according to any one of claims 1 to 3. The other end surface of the filter is supported by the housing so that a groove opened radially inward of the filter is formed between the second portion and the connection portion.
The gas generator according to claim 4. The inner peripheral surface of the filter is located radially inside the small diameter portion with respect to the inner peripheral surface of the small diameter portion.
The gas generator according to claim 5. In the combustion chamber, a tubular inner cylinder member is arranged so as to surround the ignition portion, so that a fire-transmitting agent that burns by the operation of the ignition portion and burns the gas generating agent is housed. A chamber is formed between the ignition portion and the inner cylinder member.
The inner cylinder member is formed with a communication hole that communicates the inside and the outside of the fire transmission room at least when the ignition unit is operated.
The communication hole is located between the second wall portion and the other end surface of the filter in the axial direction of the filter.
The gas generator according to any one of claims 4 to 6. Both end faces in the axial direction of the filter are the support end faces.
The gas generator according to any one of claims 1 to 7. A combustion chamber in which an ignition unit and a gas generating agent that burns by the operation of the ignition unit are arranged, and
A housing that defines the combustion chamber, that is, a tubular peripheral wall portion, a first wall portion provided on one end side of the peripheral wall portion, and a second wall portion provided on the other end side of the peripheral wall portion. , And a housing in which a gas discharge hole for communicating the combustion chamber and the outside of the housing is formed in the peripheral wall portion.
A tubular filter, which is arranged between the gas generator and the gas discharge hole in the combustion chamber so as to surround the gas generator, and one end surface in the axial direction thereof is the first wall. A filter supported by the housing on the side of the portion and the other end surface supported by the housing on the side of the second wall portion.
It is a method of assembling a gas generator equipped with
To prepare a housing component that forms a part of the housing in the gas generator and supports at least one of both end faces in the axial direction of the filter, and the filter.
The first portion, which is a part of the support end face, contacts the housing and presses the housing, and the second portion, which is a portion other than the first portion, is separated from the housing. The filter is assembled to the housing component so that the contact state between the first portion of the support end surface and the housing is formed in an annular shape along the circumferential direction of the filter.
How to assemble a gas generator. The support portion that supports the support end face in the housing component is inclined so as to shrink in diameter as the distance from the filter increases in the axial direction of the filter in the gas generator.
In assembling the filter to the housing component, the support end surface is supported by the housing with the outer peripheral edge of the support end surface as the first portion, and the contact state between the outer peripheral edge of the support end surface and the housing is described. The filter is assembled to the housing component so that it is formed in an annular shape along the circumferential direction of the filter.
The method for assembling a gas generator according to claim 9. The support end face has a protrusion that protrudes along the axial direction of the filter from other parts of the support end face.
In assembling the filter to the housing component, the support end surface is supported by the housing with the protrusion as the first portion, and the contact state between the protrusion and the housing is along the circumferential direction of the filter. Assemble the filter to the housing component so that it is formed in an annular shape.
The method for assembling a gas generator according to claim 9 or 10.

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