WO2022138134A1

WO2022138134A1 - Gas generator

Info

Publication number: WO2022138134A1
Application number: PCT/JP2021/044897
Authority: WO
Inventors: 昌宏 ▲高▼橋; 春樹滝澤; 大空冨田
Original assignee: 日本化薬株式会社
Priority date: 2020-12-25
Filing date: 2021-12-07
Publication date: 2022-06-30
Also published as: JP2022102514A

Abstract

A gas generator (1A) comprises: a housing to which an igniter (40) is assembled on one end side in an axial direction, and in which a filter (90) is disposed toward the other end in the axial direction; and a sealed container (60) in the inside of which a gas generating agent (70) is accommodated, and which is disposed between the igniter (40) and the filter (90). The sealed container (60) includes: a cup body (61) having a cylindrical side wall part (61b) and a bottom wall part (61a) that closes one axial-direction end of the cylindrical side wall part (61b); and a cover body (62) that is attached to an opening end of the cup body (61), which is the other axial-direction end thereof, so as to close the opening end. The bottom wall part (61a) of the cup body (61) is disposed on the igniter (40) side, and the cover body (62) is disposed on the filter (90) side.

Description

Gas generator

The present invention relates to a gas generator incorporated in an airbag device as an occupant protection device installed in an automobile or the like, and in particular, a so-called cylinder type gas generator having a long columnar outer shape preferably incorporated in a side airbag device or the like. Regarding the vessel.

Conventionally, airbag devices, which are occupant protection devices, have become widespread from the viewpoint of protecting occupants of automobiles and the like. The airbag device is equipped for the purpose of protecting the occupant from the impact generated in the event of a vehicle collision. By instantly inflating and deploying the airbag in the event of a vehicle collision, the airbag acts as a cushion for the occupant. It catches the body.

The gas generator is incorporated in this airbag device, and when a vehicle collides, the igniter is ignited by energization from the control unit, and the flame generated in the igniter burns the gas generator to instantly generate a large amount of gas. , A device that inflates and unfolds the airbag.

There are various types of gas generators based on the specifications such as the installation position and output for vehicles and the like. One of them is called a cylinder type gas generator. The cylinder-type gas generator has a long cylindrical outer shape, and is suitably incorporated into a side airbag device, a curtain airbag device, a knee airbag device, a seat cushion airbag device, and the like.

Normally, in a cylinder type gas generator, an igniter is attached to one end of the housing in the axial direction, and a combustion chamber containing a gas generator is provided on the one end side of the housing, and the other end of the housing in the axial direction. A filter chamber containing a filter is provided on the portion side, and a gas outlet is provided on the peripheral wall portion of the housing of the portion defining the filter chamber.

In the cylinder type gas generator configured in this way, the gas generated in the combustion chamber flows into the filter chamber along the axial direction of the housing, passes through the inside of the filter, and passes through the filter. Is ejected to the outside through the gas outlet.

Generally, in a gas generator, it is important that the gas generator is airtightly sealed from the outside. This is because if the gas generating agent absorbs moisture, the desired gas output characteristics may not be obtained.

In a cylinder type gas generator, as a method of preventing the gas generator from absorbing moisture, gas is generated in a closed container made of a relatively fragile member that melts or bursts due to the heat or pressure generated by the operation of the igniter. There is a way to contain the agent and place it inside the housing. A cylinder type gas generator in which this method is adopted is disclosed in, for example, Japanese Patent Application Laid-Open No. 2018-69924 (Patent Document 1).

In the cylinder type gas generator disclosed in the above publication, the closed container is composed of a long bottomed cylindrical cup body and a cover body that closes the open end of the closed container, and the bottom wall of the cup body. The portion is arranged on the other end side (that is, the filter side) of the housing, and the cover body is arranged on the one end side (that is, the igniter side) of the housing. Further, a coil spring is provided between the closed container arranged inside the housing and the one end portion of the housing to which the igniter is assembled to urge the closed container toward the other end side of the housing. ing. The coil spring is mainly for fixing a closed container inside the housing.

Japanese Unexamined Patent Publication No. 2018-69924

Here, as disclosed in the above publication, the joining of the cup body and the cover body constituting the closed container is generally performed by using both winding and caulking fixing. When this winding and caulking fixing are used together, for manufacturing reasons, the open end of the cup body and the winding part of the cover body are inevitably at the end of the closed container on the side where the cover body is arranged. Will be positioned so as to project outward along the axial direction of the closed container.

Therefore, when the configuration disclosed in the above publication is adopted, the gas generator and the igniter are arranged inside the closed container by the amount that the open end of the cup body and the winding portion of the cover body are positioned so as to protrude. As a result, there is a limit to shortening the time from the time when the igniter is activated to the time when the gas starts to be discharged.

Therefore, the present invention has been made to solve the above-mentioned problems, and provides a gas generator in which the time from the time when the igniter is activated to the time when the gas starts to be discharged is shortened. The purpose.

The gas generator based on the present invention includes a housing, a gas generator, an igniter, a filter, and a closed container. The housing is made of a long member in which one end and the other end in the axial direction are closed, and has a cylindrical peripheral wall portion. The gas generating agent is arranged inside the housing. The igniter is attached to a closed end located on the one end side of the housing, and the filter is arranged inside the housing and on the other end side of the housing. The closed container defines a gas generating agent accommodating chamber in which the gas generating agent is accommodated, and is arranged inside the housing and between the igniter and the filter. The closed container has a cup body including a cylindrical side wall portion arranged substantially coaxially with the housing and a bottom wall portion that closes one axial end portion of the side wall portion, and the other shaft of the cup body. It has a cover body that closes the open end by being attached to the open end which is the directional end. The cup body is composed of a fragile member that melts or explodes due to heat or pressure generated by the operation of the igniter. The bottom wall portion of the cup body is arranged on the igniter side, and the cover body is arranged on the filter side.

The gas generator based on the present invention is arranged inside the closed container and elastically urges the gas generator to immobilize the gas generator inside the closed container. Further urging members may be provided. In that case, it is preferable that the elastic urging member is arranged at the end of the closed container on the cover body side so as to be located between the cover body and the gas generating agent.

The gas generator based on the present invention may be further provided with an auto-ignition agent that is arranged inside the closed container and automatically ignites regardless of the operation of the igniter. In that case, the auto-ignition agent is arranged on the side opposite to the side where the gas generating agent is located when viewed from the elastic urging member, so that the elastic urging member causes the gas generating agent and the auto. It is preferable that the ignition agent is separated from the ignition agent.

In the gas generator based on the present invention, the elastic urging member may be composed of a coil spring.

In the gas generator based on the present invention, the cover body may be composed of a fragile member that melts or bursts due to heat or pressure generated by the operation of the igniter, in which case. May be provided with a pressure bulkhead provided with a communication hole between the closed container and the filter.

In the gas generator based on the present invention, the cover body may be composed of a non-fragile member that does not melt or explode due to heat or pressure generated by the operation of the igniter. In that case, the fragile portion in which the communication hole is formed by the operation of the igniter is provided in the cover body, so that the pressure partition wall made of a member different from the cover body is sealed. It is preferable that it is not provided between the container and the filter.

In the gas generator based on the present invention, the cup body is made of a member made of an aluminum-based material, and the cover body is an iron-based material covered with a film of the aluminum-based material. It may be composed of a member made of, and in that case, the cup body and the cover body may be joined so as to be in direct contact with each other.

In the gas generator based on the present invention, a curved concave recess may be provided in the portion of the bottom wall portion facing the igniter.

In the gas generator based on the present invention, the igniter may have an igniter loaded with an igniter and a terminal pin connected to the igniter. In that case, the gas generator based on the present invention provides a directivity-imparting member for guiding the heat particles to the closed container by giving directivity in the traveling direction of the heat particles generated in the ignition portion. It may be further prepared. The directivity-imparting member has a tubular portion that surrounds the ignition portion in the radial direction of the peripheral wall portion, and a flange portion that extends outward from the end portion of the tubular portion on the filter side. May be. In that case, it is preferable that the bottom wall portion is in contact with the flange portion.

In the gas generator based on the present invention, the housing may have a holder constituting the closed end. In that case, the holder may include an accommodating portion that opens toward the space inside the housing, and the ignition portion is accommodated in the accommodating portion and in the radial direction of the housing. It may include an annular protrusion that projects outward along the line. Further, in that case, it is preferable that the end portion of the tubular portion located on the side opposite to the side where the flange portion is provided is inserted into the accommodating portion, and the tubular portion. The end of the portion inserted into the accommodating portion is in pressure contact with the side surface of the accommodating portion, and the annular protrusion is the portion of the tubular portion inserted into the accommodating portion. It is preferable that it is sandwiched between the end portion of the cylinder and the bottom surface of the accommodating portion.

According to the present invention, it is possible to provide a gas generator in which the time from the time when the igniter is activated to the time when the gas starts to be discharged is shortened.

It is a schematic sectional drawing of the cylinder type gas generator which concerns on Embodiment 1. FIG. It is a schematic enlarged sectional view in the vicinity of the bottom wall portion of the cup body of the cylinder type gas generator shown in FIG. 1. It is a schematic enlarged sectional view in the vicinity of the cover body of the cylinder type gas generator shown in FIG. It is a schematic sectional drawing of the cylinder type gas generator which concerns on Embodiment 2. FIG. It is a schematic enlarged sectional view of the vicinity of the cover body of the cylinder type gas generator shown in FIG. It is a schematic sectional drawing of the cylinder type gas generator which concerns on Embodiment 3. FIG. FIG. 6 is a schematic enlarged cross-sectional view of the vicinity of the cover body of the cylinder type gas generator shown in FIG. It is a schematic sectional drawing of the cylinder type gas generator which concerns on Embodiment 4. FIG. FIG. 8 is a schematic enlarged cross-sectional view of the vicinity of the cover body of the cylinder type gas generator shown in FIG. It is a schematic sectional drawing of the cylinder type gas generator which concerns on Embodiment 5. FIG. FIG. 10 is a schematic enlarged cross-sectional view of the vicinity of the bottom wall portion of the cup body of the cylinder type gas generator shown in FIG. It is a schematic sectional drawing of the cylinder type gas generator which concerns on Embodiment 6. It is a schematic sectional drawing of the cylinder type gas generator which concerns on Embodiment 7. FIG. 13 is a schematic enlarged cross-sectional view of the vicinity of the bottom wall portion of the cup body of the cylinder type gas generator shown in FIG. It is a schematic sectional drawing of the cylinder type gas generator which concerns on Embodiment 8. It is a schematic sectional drawing of the cylinder type gas generator which concerns on Embodiment 9. FIG. FIG. 16 is a schematic enlarged cross-sectional view of the vicinity of the bottom wall portion of the cup body of the cylinder type gas generator shown in FIG. It is a schematic sectional drawing of the cylinder type gas generator which concerns on Embodiment 10. FIG. It is a schematic sectional drawing of the cylinder type gas generator which concerns on Embodiment 11. FIG. It is a schematic sectional drawing of the cylinder type gas generator which concerns on Embodiment 12. It is a schematic cross-sectional view of the cylinder type gas generator which concerns on the related form. FIG. 21 is a schematic enlarged cross-sectional view of the vicinity of the bottom wall portion of the cup body of the cylinder type gas generator shown in FIG. 21. FIG. 21 is a schematic enlarged cross-sectional view of the vicinity of the cover body of the cylinder type gas generator shown in FIG. 21.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiments shown below exemplify the case where the present invention is applied to a cylinder type gas generator incorporated in a side airbag device. In the embodiments shown below, the same or common parts are designated by the same reference numerals in the drawings, and the description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic cross-sectional view of the cylinder type gas generator according to the first embodiment. 2 and 3 are a schematic enlarged cross-sectional view in the vicinity of the bottom wall portion of the cup body of the cylinder type gas generator shown in FIG. 1 and a schematic enlarged cross-sectional view in the vicinity of the cover body, respectively. First, the configuration of the cylinder type gas generator 1A according to the present embodiment will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, the cylinder type gas generator 1A according to the present embodiment has a long cylindrical outer shape, and one end and the other end located in the axial direction are closed. It has a cylindrical housing. In the housing, the housing main body 10 constituting the peripheral wall portion of the housing, the holder 20 arranged on the above-mentioned one end side in the axial direction of the housing, and the above-mentioned other end side in the axial direction of the housing are arranged. The closed member 30 is included.

Inside the housing composed of the housing body 10, the holder 20, and the closing member 30, an igniter 40, a partition member 50, a closed container 60, a gas generator 70, coil springs 73, 80 and a filter 90 as internal components are included. Etc. are housed. Further, inside the housing, a combustion chamber S1 in which the gas generating agent 70 of the above-mentioned internal components is mainly arranged and a filter chamber S2 in which the filter 90 is arranged are located.

The housing body 10 is made of a long cylindrical member having openings formed at both ends in the axial direction. The holder 20 is made of a cylindrical member having a through-hole-shaped accommodating portion 21 extending in the same direction as the axial direction of the housing main body 10, and has an annular groove portion 22 for fixing caulking described later on the outer peripheral surface thereof. ing. The closing member 30 is made of a disk-shaped member having a predetermined thickness, and has an annular groove portion 31 for fixing caulking described later on its peripheral surface. The

annular groove portions

22 and 31 for fixing the caulking are both formed so as to extend along the circumferential direction on the outer peripheral surface of the holder 20 and the peripheral surface of the closing member 30.

The housing body 10 may be made of a metal member such as stainless steel, steel, aluminum alloy, or stainless alloy, or is pressed into a cylindrical shape by pressing a rolled steel plate typified by SPCE. It may be composed of a molded product. Further, the housing main body 10 may be composed of an electric sewing pipe typified by STKM.

In particular, when the housing body 10 is made of a pressed molded product of rolled steel plate or an electric sewing pipe, the housing body 10 can be easily and inexpensively compared with the case where a metal member such as stainless steel or steel is used. It can be formed and can be significantly reduced in weight.

On the other hand, the holder 20 and the closing member 30 are made of metal members such as stainless steel, steel, aluminum alloy, and stainless alloy.

The holder 20 is fixed to the housing body 10 so as to close one open end of the housing body 10 in the axial direction. Specifically, with the holder 20 inserted in the one open end of the housing body 10, the housing body 10 of the portion corresponding to the annular groove portion 22 provided on the outer peripheral surface of the holder 20 is radially inside. The holder 20 is caulked and fixed to the housing body 10 by being reduced in diameter toward the surface and engaging with the annular groove portion 22. As a result, the closed end on the one end side in the axial direction of the housing is formed by the holder 20.

The closing member 30 is fixed to the housing body 10 so as to close the other opening end of the housing body 10 in the axial direction. Specifically, with the closing member 30 inserted in the other opening end of the housing main body 10, the diameter of the housing main body 10 of the portion corresponding to the annular groove portion 31 provided on the peripheral surface of the closing member 30 is large. The closing member 30 is caulked and fixed to the housing body 10 by being reduced in diameter toward the inside in the direction and engaging with the annular groove portion 31. As a result, the closed end on the other end side in the axial direction of the housing is formed by the closed member 30.

These caulking fixings are caulking fixings called Happo caulking in which the diameter of the housing body 10 is reduced substantially evenly toward the inside in the radial direction. By performing this eight-way caulking, the housing body 10 is provided with the

caulking portions

12, 13. As a result, the caulked

portions

12 and 13 come into direct contact with the

annular groove portions

22 and 31, respectively, and it is prevented that a gap is generated between them.

The assembly structure of the holder 20 and the closing member 30 with respect to the housing body 10 is not limited to the above-mentioned assembly structure, and other assembly structures may be adopted. Further, the housing main body 10 and the closing member 30 may not be separated from each other, but may be configured by one member having a bottomed cylindrical shape.

As shown in FIGS. 1 and 2, the igniter 40 is supported by the holder 20 and is attached to the above-mentioned one end portion in the axial direction of the housing. The igniter 40 is for burning the gas generating agent 70, and is installed so as to face the space inside the housing.

The igniter 40 includes an ignition unit 41 and a pair of terminal pins 42 connected to the ignition unit 41. The ignition unit 41 includes an ignition charge, an embolus, and a squib cup, and the ignition charge is housed in the ignition unit 41 by being loaded into a space defined by the embolism and the squib cup. The pair of terminal pins 42 are held by embolism. Further, a resistor (bridge wire) is attached to the inside of the ignition unit 41 so as to be connected to the pair of terminal pins 42, and described above so as to surround or contact the resistor. The igniter is located. The inside of the ignition unit 41 may be loaded with a gunpowder, if necessary.

Here, as the resistor, a nichrome wire, a resistance wire made of an alloy containing platinum and tungsten, or the like is generally used, and as an igniter, ZPP (zirconium / potassium perchlorate) or ZWPP (zirconium / tungsten / lead) is generally used. (Potassium chlorate), lead tricinate, etc. are used. Further, as the explosive, a composition composed of a metal powder / oxidizing agent typified by B / KNO ₃ , B / NaNO ₃ , Sr (NO ₃ ) ₂ , etc., and a composition composed of titanium hydride / potassium perchlorate. A composition consisting of B / 5-aminotetrazole / potassium nitrate / molybdenum trioxide and the like are used.

When a collision is detected, a predetermined amount of current flows through the resistor through the terminal pin 42. When a predetermined amount of current flows through the resistor, Joule heat is generated in the resistor and the igniter starts combustion. The hot heat particles produced by the combustion cleave the squib cup containing the igniter. The time from when a current flows through the resistor until the igniter 40 operates is generally 2 milliseconds or less when a nichrome wire is used for the resistor.

A combustion control cover 43 is extrapolated to the ignition unit 41 of the igniter 40 as a directivity imparting member. The combustion control cover 43 is made of a metal member and includes a substantially cylindrical tubular portion 43a. The combustion control cover 43 is for efficiently guiding the heat particles generated by the igniter 40 during operation to the closed container 60 and the gas generating agent 70 contained therein, and more specifically, ignition. It gives directivity to the traveling direction of the heat particles generated in the ignition unit 41 of the vessel 40.

Specifically, since the ignition portion 41 is surrounded by the tubular portion 43a of the combustion control cover 43 in the radial direction of the housing body 10, gas is generated in the squib cup when the squib cup bursts. An opening is mainly formed in the tip portion located on the agent 70 side, and the traveling direction of the heat particles generated in the ignition portion 41 is narrowed in the axial direction of the housing body 10 accordingly. Therefore, by providing the combustion control cover 43 as described above, it becomes possible to efficiently guide the heat particles generated by the igniter 40 to the gas generating agent 70.

The igniter 40 and the combustion control cover 43 are fixed to the holder 20 by a caulking portion 23 provided on the holder 20, whereby the igniter 40 has its ignition portion 41 protruding toward the inside of the housing. It is assembled to the holder 20 so as to be located.

Specifically, the accommodating portion 21 provided in the holder 20 is open toward the space inside the housing, and the holder 20 is an annular shape protruding inward from the wall surface of the portion defining the accommodating portion 21. It has a pedestal portion 24 having a shape, and has the above-mentioned caulking portion 23 for caulking and fixing the igniter 40 at the axial end portion facing the space inside the housing. Further, the end portion 43a1 of the cylindrical portion 43a of the combustion control cover 43 on the holder 20 side has a larger diameter than the other portions of the tubular portion 43a, and the igniter 40 has a diameter at a predetermined position of the ignition portion 41. It has an annular protrusion 41a that projects outward in the direction.

At the time of assembly, the igniter 40 to which the combustion control cover 43 is attached is inserted into the accommodating portion 21 and is held against the pedestal portion 24, and the caulking portion 23 is crimped in this state. The annular protrusion 41a of the igniter 40 and the above-mentioned end 43a1 of the combustion control cover 43 are sandwiched between the caulking portion 23 and the pedestal portion 24 that defines the bottom surface of the accommodating portion 21 of the holder 20. As a result, both the igniter 40 and the combustion control cover 43 are fixed to the holder 20.

The terminal pin 42 of the igniter 40 is arranged at the axial end of the accommodating portion 21 that is exposed to the outside of the holder 20. The accommodating portion 21 of the portion where the terminal pin 42 is arranged forms a female connector portion that receives a male connector (not shown) of a harness for connecting the igniter 40 and a control unit (not shown). ing. A male connector is inserted into the accommodating portion 21 of the portion that functions as the female connector portion, whereby electrical conduction between the core wire of the harness and the terminal pin 42 is realized.

As shown in FIGS. 1 and 3, the partition member 50 is arranged at a predetermined position in the space inside the housing. The partition member 50 is a member for partitioning the space inside the housing into the combustion chamber S1 and the filter chamber S2 in the axial direction.

The partition member 50 has a bottomed cylindrical shape, and is made of a metal member such as stainless steel, steel, aluminum alloy, or stainless alloy. The partition member 50 functions as a pressure bulkhead, and has a flat plate-shaped partition wall 51 arranged so as to be orthogonal to the axial direction of the housing body 10 and a tubular plate-like structure erected from the peripheral edge of the bulkhead 51. It has an annular wall portion 52 of the above. The partition member 50 is arranged so that the outer main surface of the partition wall portion 51 abuts on the filter 90, and the outer peripheral surface of the annular wall portion 52 abuts on the inner peripheral surface of the housing body 10.

The partition wall 51 is provided with a through-hole-shaped communication hole 51a, and the main surface of the partition wall 51 located on the filter 90 side is provided with a score 51b so as to surround the communication hole 51a. The communication hole 51a is for communicating the combustion chamber S1 and the filter chamber S2. On the other hand, the score 51b is for causing the partition wall portion 51 to break from the communication hole 51a described above as a starting point and form a larger opening as the internal pressure of the combustion chamber S1 increases due to the combustion of the gas generating agent 70. For example, it is composed of a plurality of grooves provided so as to intersect each other radially.

The communication hole 51a does not necessarily have to be provided in the partition wall 51 in advance, and the partition wall 51 is cleaved by receiving the pressure generated in the combustion chamber S1 when the cylinder type gas generator 1A is operated. It may be configured to open and thereby form a communication hole. Further, the score 51b does not necessarily have to be provided in the partition wall portion 51, but if the communication hole 51a is not provided in the partition wall portion 51 in advance as described above, the score 51b can be used as a starting point for opening the partition wall portion 51. It is preferable that this is provided in the partition wall portion 51.

As shown in FIGS. 1 to 3, a closed container 60 and a coil spring 80 are arranged in a space (that is, a combustion chamber S1) sandwiched between a holder 20 and a partition member 50 in the space inside the housing. ing. Further, the gas generating agent 70 and the coil spring 73 are housed in the gas generating agent accommodating chamber S1A, which is the space inside the closed container 60.

The closed container 60 is for sealing the gas generating agent 70 contained therein, and includes a cup body 61 and a cover body 62. By joining the cup body 61 and the cover body 62, the gas generating agent accommodating chamber S1A described above is formed inside the closed container 60.

The closed container 60 has a substantially cylindrical shape with both ends closed, and is arranged substantially coaxially with the housing. Both the cup body 61 and the cover body 62 constituting the closed container 60 are made of a fragile member that melts or bursts due to heat or pressure generated by the operation of the igniter 40.

The cup body 61 has a flat plate-shaped bottom wall portion 61a and a cylindrical side wall portion 61b extending from the peripheral edge of the bottom wall portion 61a. On the other hand, the cover body 62 extends from the flat plate-shaped lid portion 62a located inside the cup body 61 by being inserted into the opening end 61b1 of the cup body 61 and the peripheral edge of the lid portion 62a, and opens the cup body 61. It has a winding portion 62b which is partially curved so as to cover the inner peripheral surface, the end surface, and the outer peripheral surface of the end 61b1.

Here, the above-mentioned joining of the cup body 61 and the cover body 62 is performed between the open end 61b1 of the cup body 61 and the winding portion 62b of the cover body 62 provided so as to cover the open end 61b1. As a result, the open end 61b1 of the cup body 61 is closed by the cover body 62.

More specifically, the open end 61b1 of the cup body 61 is wound by the winding portion 62b of the cover body 62, and the first caulking portion is provided on the winding portion 62b provided so as to cover the open end 61b1 of the cup body 61. By providing 62b1 and the second caulking portion 62b2, the joining between the cup body 61 and the cover body 62 is realized. Both the first caulking portion 62b1 and the second caulking portion 62b2 are formed by reducing the diameter of a predetermined portion of the cup body 61 inward in the radial direction.

As described above, both the cup body 61 and the cover body 62 are composed of fragile members that melt or explode due to heat or pressure generated by the operation of the igniter 40. More specifically, in the cover body 62, the heat or pressure generated by the combustion of the igniter or the igniter in addition to the igniter and the combustion of the igniter or the igniter in addition to the igniter 40 by the operation of the igniter 40. The cup body 61 is composed of a fragile member that melts or bursts due to the operation of the igniter 40 to burn the gas generating agent 70, and the heat or pressure generated by the burning of the gas generating agent 70. It is composed of fragile members that melt or burst due to.

Specifically, the cup body 61 and the cover body 62 are preferably made of a press-molded product made of a metal such as copper, aluminum, a copper alloy, or an aluminum alloy, and these are joined as described above. As a result, the gas generating agent 70 contained therein is hermetically sealed from the outside.

The closed container 60 is inserted into the housing body 10 so that the bottom wall portion 61a of the cup body 61 is located on the igniter 40 side and the cover body 62 is located on the filter 90 side. As a result, the bottom wall portion 61a of the cup body 61 faces the ignition portion 41 of the igniter 40, and the lid portion 62a of the cover body 62 faces the partition wall portion 51 of the partition member 50.

More specifically, the end of the closed container 60 on the side where the bottom wall portion 61a of the cup body 61 is located is loosely fitted to the housing body 10, and the closed container on the side where the lid portion 62a of the cover body 62 is located is located. The end portion of the 60 is fitted or loosely fitted to the partition member 50 by being inserted into the partition member 50. As a result, the closed container 60 is positioned with the annular wall portion 52 of the partition member 50 interposed between the closed container 60 and the housing main body 10, and is arranged at a predetermined distance from the inner peripheral surface of the housing main body 10. Will be done.

Therefore, a heat insulating layer S1B, which is a space of a predetermined size, is formed between the housing main body 10 constituting the peripheral wall portion of the housing and the side wall portion 61b of the closed container 60, and the heat insulating layer S1B is formed. Will extend in a substantially cylindrical shape along the axial direction of the combustion chamber S1.

In this way, by providing the heat insulating layer S1B having a cylindrical shape between the closed container 60 containing the gas generating agent 70 and the housing main body 10, the heat insulating layer S1B becomes a thermal resistance and the housing main body 10 It becomes difficult for the heat of the gas generator 70 to be transferred to the gas generating agent 70. Therefore, it is possible to suppress the temperature rise and fall of the gas generator 70 under the influence of the ambient temperature of the cylinder type gas generator 1A, and the temperature change of the gas generator 70 is less likely to occur. Therefore, with such a configuration, the operation of the cylinder type gas generator 1A is stabilized.

Further, by providing the heat insulating layer S1B, the gas generator 70 is heated from the outside even when a fire or the like occurs in a vehicle or the like equipped with an airbag device incorporating a cylinder type gas generator 1A. It is possible to effectively suppress the temperature rise. That is, by providing the heat insulating layer S1B, even when the above-mentioned fire or the like occurs, the temperature of the gas generating agent 70 rises at an early stage and the gas generating agent 70 spontaneously ignites regardless of the operation of the igniter 40. It will be possible to prevent this from happening, and improvements will be made in terms of safety.

Here, the heat insulating layer S1B preferably has a thermal conductivity lower than that of the housing body 10, and in the present embodiment, it is composed of an air layer. However, the heat insulating layer S1B does not necessarily have to be an air layer, and may be composed of a gas layer filled with another gas or a vacuum layer. Furthermore, in addition to this, the heat insulating layer S1B may be formed by arranging various heat insulating members in the space.

A coil spring 73 as an elastic urging member is arranged at the end of the gas generating agent accommodating chamber S1A formed inside the closed container 60 on the partition member 50 side. On the other hand, in the gas generating agent accommodating chamber S1A formed inside the closed container 60, the gas generating agent 70 is arranged in a portion other than the end portion on the partition member 50 side.

The gas generating agent 70 is a chemical that generates gas by being ignited by heat particles generated by the operation of the igniter 40 and burning. As the gas generator 70, it is preferable to use a non-azid gas generator, and the gas generator 70 is generally configured as a molded body containing a fuel, an oxidizing agent, and an additive.

As the fuel, for example, a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, or a combination thereof is used. Specifically, for example, nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole and the like are preferably used.

Examples of the oxidizing agent include basic metal salts such as basic copper nitrate and basic copper carbonate, perchlorates such as ammonium perchlorate and potassium perchlorate, alkali metals, alkaline earth metals, transition metals, and ammonia. Nitrate and the like containing cations selected from the above are used. As the nitrate, for example, sodium nitrate, potassium nitrate and the like are preferably used.

Examples of the additive include a binder, a slag forming agent, a combustion adjusting agent, and the like. As the binder, for example, an organic binder such as a metal salt of carboxymethyl cellulose or stearate, or an inorganic binder such as synthetic hydrotalcite or acidic clay can be preferably used. As the slag forming agent, silicon nitride, silica, acidic white clay and the like can be preferably used. As the combustion regulator, metal oxides, ferrosilicon, activated carbon, graphite and the like can be preferably used.

The shape of the molded body of the gas generating agent 70 includes various shapes such as granules, pellets, cylinders and the like, and discs. Further, in the case of a columnar type, a perforated (for example, single-hole cylinder shape, perforated cylinder shape, etc.) molded body having a through hole inside the molded body is also used. These shapes are preferably selected as appropriate according to the specifications of the airbag device into which the cylinder type gas generator 1A is incorporated. For example, the shape in which the gas generation rate changes with time when the gas generator 70 is burned. It is preferable to select the optimum shape according to the specifications, such as selecting. Further, it is preferable to appropriately select the size and filling amount of the molded product in consideration of the linear combustion speed, pressure index and the like of the gas generating agent 70 in addition to the shape of the gas generating agent 70.

The coil spring 73 is provided for the purpose of preventing the gas generating agent 70 made of a molded body from being crushed by vibration or the like, and is a spring portion 73a and a pressing portion 73b formed by bending a metal wire rod. have. The coil spring 73 is arranged at the end of the closed container 60 on the cover body 62 side, and more specifically, the coil spring 73 is arranged so that one end of the spring portion 73a abuts on the lid portion 62a of the cover body 62. The pressing portion 73b is formed at the other end of the spring portion 73a. The pressing portion 73b is configured such that, for example, metal wires are arranged substantially in parallel at predetermined intervals, and is in contact with the gas generating agent 70.

As a result, the gas generating agent 70 is elastically urged toward the igniter 40 side by the coil spring 73, and is prevented from moving inside the closed container 60. Instead of the coil spring 73 as described above, it is made of, for example, a ceramic fiber molded body, rock wool, a foamed resin (for example, foamed silicone, foamed polypropylene, foamed polyethylene, etc.), chloroprene, and a member made of rubber typified by EPDM. The cushioning material may be used as an elastic urging member.

In the space of the combustion chamber S1 located closer to the holder 20 than the closed container 60, the coil spring 80, which is a separate component from the coil spring 73 described above, is arranged. The coil spring 80 is formed by spirally winding a metal wire, and unlike the coil spring 73 described above, it does not have a pressing portion 73b as the coil spring 73 has. In the present embodiment, the coil spring 80 has a substantially cylindrical outer shape as a whole because the metal wire is wound so as to have the same inner diameter at any position in the axial direction.

The coil spring 80 is a member for fixing the closed container 60 inside the housing while absorbing dimensional variations of various components housed inside the housing. Further, the coil spring 80 is also for maintaining an appropriate distance from the igniter 40 assembled at one end of the housing to the gas generating agent 70 housed in the closed container 60.

Therefore, the coil spring 80 is interposed between the above-mentioned one end portion in the axial direction of the housing and the closed container 60, the one end thereof is arranged so as to abut on the holder 20, and the other end is the closed container. It is arranged so as to abut on the end portion of the 60 on the holder 20 side (that is, the bottom wall portion 61a of the cup body 61). As a result, the closed container 60 is elastically urged by the coil spring 80 toward the partition member 50 side which is the other end side in the axial direction of the housing, and is sandwiched between the partition member 50 and the coil spring 80 described above. By doing so, it will be fixed to the housing.

As shown in FIG. 1, in the space inside the housing, the filter 90 is arranged in the space sandwiched between the closing member 30 and the partition member 50 (that is, the filter chamber S2). The filter 90 is composed of a cylindrical member having a hollow portion 91 extending in the same direction as the axial direction of the housing body 10, one end surface of the axial direction is in contact with the closing member 30, and the other in the axial direction thereof. The end face is in contact with the partition member 50.

The filter 90 functions as a cooling means for cooling the gas by taking away the high-temperature heat of the gas when the gas generated by the combustion of the gas generating agent 70 passes through the filter 90, and also in the gas. It also functions as a removing means for removing slag (residue) and the like contained in. By using the filter 90 made of a cylindrical member as described above, the flow resistance to the gas flowing in the filter chamber S2 during operation can be suppressed to a low level, and efficient gas flow can be realized. ..

As the filter 90, a filter 90 preferably made of a metal wire rod made of stainless steel, steel or the like, or an aggregate of metal net materials can be used. Specifically, a knitted wire mesh, a plain weave wire mesh, an aggregate of crimp-woven metal wire rods, or a material obtained by pressing these can be used.

Further, as the filter 90, one wound by winding a perforated metal plate or the like can also be used. In this case, the perforated metal plate may be, for example, an expanded metal in which a staggered cut is made in the metal plate and the metal plate is expanded to form a hole and processed into a mesh shape, or an expanded metal in which a hole is made in the metal plate and at that time. Hook metal or the like flattened by crushing burrs generated on the periphery of the hole can be used.

A plurality of gas outlets 11 are provided along the circumferential direction and the axial direction in the housing main body 10 of the portion defining the filter chamber S2. These plurality of gas outlets 11 are for leading the gas after passing through the filter 90 to the outside of the housing.

Next, with reference to FIG. 1, the operation of the cylinder type gas generator 1A according to the present embodiment during operation will be described.

With reference to FIG. 1, when a vehicle equipped with the cylinder type gas generator 1A according to the present embodiment collides, the collision is detected by a collision detecting means separately provided for the vehicle, and based on this, the collision is detected. The igniter 40 is operated by energization from a control unit separately provided in the vehicle.

When the igniter 40 is activated, the pressure inside the ignition unit 41 rises due to the combustion of the igniter or the igniter in addition to the igniter, which causes the squib cup of the ignition unit 41 to open and the igniter to burn. The generated heat particles flow out to the outside of the ignition unit 41.

Directivity is given to the heat particles flowing out from the ignition unit 41 by the above-mentioned combustion control cover 43, which leads to the bottom wall portion 61a of the cup body 61 of the closed container 60. Along with this, the bottom wall portion 61a of the cup body 61 melts or bursts due to the heat or pressure generated by the operation of the igniter 40, and the above-mentioned heat particles are contained in the closed container 60 as a gas generating agent. Reach 70.

The heat particles that have reached the gas generating agent 70 burn the gas generating agent 70, whereby a large amount of gas is generated. Along with this, the pressure and temperature of the gas generating agent storage chamber S1A rise, the side wall portion 61b of the cup body 61 of the closed container 60 bursts or melts, and the lid portion 62a of the cover body 62 of the closed container 60 bursts. Or melt.

As a result, the combustion chamber S1 and the filter chamber S2 are in a state of communicating with each other through the communication hole 51a provided in the partition wall portion 51 of the partition member 50, and the gas generated in the combustion chamber S1 passes through the communication hole 51a. And flows into the filter chamber S2. Further, as the gas generating agent 70 continues to burn, the pressure of the entire combustion chamber S1 further rises, so that the portion of the partition wall portion 51 of the partition member 50 provided with the score 51b is broken. As a result, a larger amount of gas flows into the filter chamber S2.

The gas that has flowed into the filter chamber S2 flows through the hollow portion 91 of the filter 90 along the axial direction, then turns in the radial direction, and passes through the inside of the filter 90. At that time, heat is taken away by the filter 90 to cool the gas, and the slag contained in the gas is removed by the filter 90.

Then, the gas after passing through the filter 90 is ejected to the outside of the housing through the gas ejection port 11. The ejected gas is introduced into the inside of the airbag provided adjacent to the cylinder type gas generator 1A, and expands and expands the airbag.

As described above, in the cylinder type gas generator 1A according to the present embodiment, the joint between the cup body 61 and the cover body 62 constituting the closed container 60 is combined with winding and caulking fixing. The closed container 60 is arranged so that the bottom wall portion 61a of the cup body 61 is located on the igniter 40 side and the cover body 62 is located on the filter 90 side. Therefore, for manufacturing reasons, the open end 61b1 of the cup body 61 and the winding portion 62b of the cover body 62, which are positioned so as to project along the axial direction of the closed container 60, are arranged on the igniter 40 side. Instead, it will be placed on the filter 90 side.

Therefore, in the case of such a configuration, the distance between the igniter 40 and the closed container 60 can be set to a desired distance without any restriction. In this regard, in the cylinder type gas generator 1A according to the present embodiment, the elastic modulus of the coil spring 80 is adjusted so that the distance between the igniter 40 and the closed container 60 is accurately adjusted to a predetermined distance. Can be included.

Therefore, by adopting the above-described configuration, the distance between the gas generating agent 70 arranged inside the closed container 60 and the igniter 40 can be made shorter than before, and as a result, the igniter 40 can be used. It is possible to shorten the time from the time when the gas is activated to the time when the gas starts to be discharged. This makes it possible to obtain a cylinder-type gas generator with higher performance than before.

Further, in the cylinder type gas generator 1A according to the present embodiment, the cover body of the closed container 60 is located so that the coil spring 73 as the elastic urging member is located between the cover body 62 and the gas generator 70. It is arranged at the end on the 62 side. With this configuration, the coil spring 73 is not arranged in the portion of the closed container 60 on the igniter 40 side, so that the gas generator 70 and the igniter 40 further arranged inside the closed container 60 The distance between them can be shortened.

Therefore, by adopting this configuration, it becomes possible to further shorten the distance between the gas generating agent 70 arranged inside the closed container 60 and the igniter 40, and as a result, the igniter 40 operates. It is possible to further shorten the time from the time point to the time when the gas starts to be discharged. This makes it possible to obtain a cylinder-type gas generator with even higher performance than before.

(Embodiment 2)
FIG. 4 is a schematic cross-sectional view of the cylinder type gas generator according to the second embodiment, and FIG. 5 is a schematic enlarged cross-sectional view of the vicinity of the cover body of the cylinder type gas generator shown in FIG. Hereinafter, the cylinder type gas generator 1B according to the present embodiment will be described with reference to FIGS. 4 and 5.

As shown in FIGS. 4 and 5, the cylinder type gas generator 1B according to the present embodiment further comprises an autoignition agent 71 when compared with the cylinder type gas generator 1A according to the above-described first embodiment. The composition is different only in that it is provided.

The autoignition agent 71 is composed of pellets formed into flat and substantially columnar shapes, and is arranged inside the closed container 60. More specifically, the auto-ignition agent 71 is arranged on the side opposite to the side where the gas generating agent 70 is located (that is, the filter 90 side) when viewed from the coil spring 73, and the lid portion 62a of the cover body 62 and the coil spring. It is sandwiched and held by 73. As a result, the autoignition agent 71 is separated from the gas generating agent 70 by the coil spring 73.

The auto-ignition agent 71 is an agent that automatically ignites regardless of the operation of the igniter 40. More specifically, the autoignition agent 71 spontaneously ignites at a temperature lower than that of the gas generator 70, and in the unlikely event of a fire or the like in a vehicle equipped with an airbag device incorporating a cylinder type gas generator 1B. This is to prevent abnormal operation from being induced by heating the cylinder type gas generator 1B from the outside when the above occurs.

Here, since the auto-ignition agent 71 is composed of a composition similar to that of the gas generating agent 70, depending on the combination of these compositions, when the gas generating agent 70 and the auto-ignition agent 71 are contact-arranged, the auto-ignition agent 71 is gradually arranged. It may cause aging deterioration that causes changes in each other's composition. Therefore, in the past, it was common to arrange a metal plate-shaped member between them so that the gas generating agent 70 and the autoignition agent 71 would not come into direct contact with each other. An example of the configuration is shown in a related form (see FIG. 21 and the like) described later. In the related form, the partition member 72 is an auto-ignition agent 71 and a gas generating agent as the metal plate-shaped member. It is arranged between 70 and 70.

However, in the cylinder type gas generator 1B according to the present embodiment, the coil spring 73 as the elastic urging member is the cover body 62 as in the cylinder type gas generator 1A according to the above-described first embodiment. Since it is arranged at the end of the closed container 60 on the cover body 62 side so as to be located between the gas generator 70 and the gas generator 70, the gas generator 70 and the auto ignition agent are used by using the coil spring 73 as described above. It is supposed to be separated from 71. Therefore, with such a configuration, it is not necessary to separately arrange a metal plate-shaped member as described above, so that it is possible to reduce the number of parts and reduce the weight and size of the cylinder type gas generator. Become.

Further, by configuring as described above, the auto-ignition agent 71 is connected to the housing body 10 at the end of the closed container 60, which is a metal member, near the cover body 62, and a partition, which is a metal member. Thermal contact is made via the member 50 in a substantially shortest path. Therefore, when a fire or the like occurs in a vehicle or the like, the timing of the auto-ignition operation started by the automatic ignition of the auto-ignition agent 71 is accelerated, and as a result, the auto-ignition operation is generated. The temperature of the gas generating agent 70 can be kept relatively low. Therefore, it becomes possible to significantly suppress an increase in the internal pressure of the housing during the auto-ignition operation, and it is possible to improve the safety.

As described above, when the cylinder type gas generator 1B according to the present embodiment is used, it is possible to further obtain these various effects in addition to the effects described in the above-described first embodiment.

(Embodiment 3)
FIG. 6 is a schematic cross-sectional view of the cylinder type gas generator according to the third embodiment, and FIG. 7 is a schematic enlarged cross-sectional view of the vicinity of the cover body of the cylinder type gas generator shown in FIG. Hereinafter, the cylinder type gas generator 1C according to the present embodiment will be described with reference to FIGS. 6 and 7.

As shown in FIGS. 6 and 7, the cylinder type gas generator 1C according to the present embodiment is the cylinder type gas generator when compared with the cylinder type gas generator 1A according to the above-described first embodiment. The configuration is different only in that the partition member 50 (see FIG. 1 and the like) provided in 1A is not provided and the material of the cover body 62 in the closed container 60 is different.

Specifically, the cover body 62 of the closed container 60 is made of a non-fragile member that does not melt or explode due to heat or pressure generated by the operation of the igniter 40. As an example, the cover body 62 is made of a press-molded product made of metal such as stainless steel or steel. On the other hand, the cup body 61 of the closed container 60 is press-molded from a metal such as copper, aluminum, a copper alloy, or an aluminum alloy, as in the case of the cylinder type gas generator 1A according to the first embodiment described above. It is composed of products.

As described above, by forming the cover body 62 of the closed container 60 with a non-fragile member, the partition member 50 provided in the cylinder type gas generator 1A according to the first embodiment described above is replaced with the partition member 50. The cover body 62 can be used as a pressure bulkhead.

As shown in FIG. 7, a score 62a1 as a fragile portion is provided on the main surface of the cover portion 62 on the filter 90 side of the cover portion 62a. The score 62a1 is for allowing the lid portion 62a of the cover body 62 made of a non-fragile member to break and a communication hole to be formed as the internal pressure of the combustion chamber S1 rises due to the combustion of the gas generating agent 70. For example, it is composed of a plurality of grooves provided so as to intersect each other radially. The score 62a1 is provided in a portion of the filter 90 facing the hollow portion 91.

By using the cylinder type gas generator 1C according to the present embodiment described above, in addition to the effects described in the above-described first embodiment, the cylinder type gas generator 1A according to the first embodiment is provided. Since the partition member 50 that has been used can be abolished, it is possible to obtain the effects of reducing the number of parts and reducing the weight and size of the cylinder type gas generator.

Here, when the cup body 61 of the closed container 60 is made of a member made of, for example, an aluminum-based material, and the cover body 62 is made of a member made of, for example, an iron-based material, dissimilar metals come into direct contact with each other. Since they are joined in the same state, so-called galvanic corrosion may occur. In order to prevent this, the cover body 62 may be composed of a member made of an iron-based material covered with a film of an aluminum-based material, and this may be directly bonded to the cup body 61. Here, as a method of covering the surface of a member made of an iron-based material with a film of an aluminum-based material, for example, aluminum plating is assumed.

As described above, the cylinder type gas generator 1C according to the present embodiment is not provided with the partition member 50 provided in the cylinder type gas generator 1A according to the first embodiment. Therefore, if no measures are taken, the closed container 60, which was performed by the annular wall portion 52 of the partition member 50 in the cylinder type gas generator 1A according to the first embodiment, cannot be positioned. As a result, the heat insulating layer S1B cannot be reliably formed between the closed container 60 and the housing body 10.

In this respect, in the cylinder type gas generator 1C according to the present embodiment, the cup body 61 and the cover body constituting the closed container 60 are the same as in the case of the cylinder type gas generator 1A according to the above-described first embodiment. Since the joining with the 62 is performed by the combined use of winding and caulking fixing, the closed container 60 can be positioned by this.

That is, by providing the winding portion 62b in the cover body 62 so as to cover the opening end 61b1 of the cup body 61, the thickness of the portion of the winding portion 62b that covers the outer surface of the opening end 61b1 of the cup body 61 is increased. A gap can be provided between the side wall portion 61b of the cup body 61 and the housing body 10. Further, of the winding portion 62b of the cover body 62, the portion covering the outer peripheral surface of the opening end 61b1 of the cup body 61 and facing the winding portion 62b of the portion covering the inner peripheral surface of the opening end 61b1 of the cup body 61. Since the second caulking portion 62b2 is provided in the portion, the winding portion 62b of the portion adjacent to the second caulking portion 62b2 is slightly pushed outward due to the pressure flow during the caulking process. The protruding portion also functions as a spacer for arranging the side wall portion 61b of the cup body 61 and the housing body 10 at a distance.

Therefore, by using the cylinder type gas generator 1C according to the present embodiment, the effect obtained by providing the heat insulating layer S1B described in the above-described first embodiment can also be obtained.

(Embodiment 4)
FIG. 8 is a schematic cross-sectional view of the cylinder type gas generator according to the fourth embodiment, and FIG. 9 is a schematic enlarged cross-sectional view of the vicinity of the cover body of the cylinder type gas generator shown in FIG. Hereinafter, the cylinder type gas generator 1D according to the present embodiment will be described with reference to FIGS. 8 and 9.

As shown in FIGS. 8 and 9, the cylinder type gas generator 1D according to the present embodiment has a characteristic configuration of the cylinder type gas generator 1B according to the above-mentioned second embodiment and the above-mentioned embodiment. It has the characteristic configuration of the cylinder type gas generator 1C according to No. 3.

Specifically, in the cylinder type gas generator 1B according to the present embodiment, the autoignition agent 71 is inside the closed container 60 and is opposite to the side where the gas generator 70 is located when viewed from the coil spring 73. By arranging it on the side (that is, on the filter 90 side), it is arranged separated from the gas generator 70 by a coil spring 73, and the cover body 62 of the closed container 60 is composed of a non-fragile member. The partition member 50 (see FIG. 1 and the like) provided in the cylinder type gas generator 1A according to the first embodiment is abolished, and the cover body 62 is used as a pressure partition.

When configured in this way, all of the effects described in the above-described embodiments 2 and 3 can be obtained, and in terms of safety, compactness and weight reduction, and higher performance than before. It can also be a cylinder type gas generator with significantly improved.

(Embodiment 5)
10 is a schematic cross-sectional view of the cylinder type gas generator according to the fifth embodiment, and FIG. 11 is a schematic enlarged cross-sectional view of the vicinity of the bottom wall portion of the cup body of the cylinder type gas generator shown in FIG. .. Hereinafter, the cylinder type gas generator 1E according to the present embodiment will be described with reference to FIGS. 10 and 11.

As shown in FIGS. 10 and 11, the cylinder type gas generator 1E according to the present embodiment is a cup body of the closed container 60 when compared with the cylinder type gas generator 1A according to the above-described first embodiment. The configuration is different only in that the recessed portion 61a1 is provided in the bottom wall portion 61a of the 61.

Specifically, a portion of the bottom wall portion 61a of the cup body 61 facing the igniter 40 is formed with a curved concave portion toward the inside of the closed container 60, and the curved concave portion is formed. The recessed portion 61a1 described above is formed by the recessed portion. By providing the recessed portion 61a1, a buffer space S1C is provided between the ignition portion 41 of the igniter 40 and the closed container 60.

As described above, when the igniter 40 is operating, a tear occurs at the tip of the squib cup of the ignition unit 41. Therefore, in order to further shorten the time from the time when the igniter 40 is activated to the time when the gas starts to be discharged, the tip of the squib cup of the ignition unit 41 is smoothly restricted by other members. Cleavage is preferred. For that purpose, it is conceivable to arrange the recessed portion 61a1 at a distance from the igniter 40 without providing the recessed portion 61a1 on the bottom wall portion 61a of the cup body 61. It will lead to the increase in size, and it is not always a preferable solution.

On the other hand, in the cylinder type gas generator 1E according to the present embodiment, the bottom wall portion 61a of the cup body 61 is ignited by providing the curved concave recessed portion 61a1 in the bottom wall portion 61a as described above. Although the gas generator is arranged at a predetermined distance from 40, the volume of the buffer space S1C formed by the buffer space S1C is reduced, and the size of the cylinder type gas generator is suppressed as much as possible.

In addition, the heat particles emitted from the ignition unit 41 due to the squib cup exploding will proceed radially. Therefore, by providing the curved concave recessed portion 61a1 in the bottom wall portion 61a as described above, most of the heat particles traveling radially reach the bottom wall portion 61a of the cup body 61 without delay, and the closed container. 60 melts or bursts will be achieved early. Therefore, also in this respect, it is possible to shorten the time from the time when the igniter 40 is operated to the time when the gas starts to be discharged.

Therefore, by using the cylinder type gas generator 1E according to the present embodiment, in addition to the effects described in the above-described first embodiment, an effect that a higher performance cylinder type gas generator can be obtained can be obtained. Will be.

(Embodiment 6)
FIG. 12 is a schematic cross-sectional view of the cylinder type gas generator according to the sixth embodiment. Hereinafter, the cylinder type gas generator 1F according to the present embodiment will be described with reference to FIG. 12.

As shown in FIG. 12, the cylinder type gas generator 1F according to the present embodiment relates to the characteristic configuration of the cylinder type gas generator 1B according to the above-mentioned second embodiment and the above-mentioned embodiment 5. It has the characteristic configuration of the cylinder type gas generator 1E.

Specifically, in the cylinder type gas generator 1F according to the present embodiment, the autoignition agent 71 is inside the closed container 60 and is opposite to the side where the gas generator 70 is located when viewed from the coil spring 73. By arranging it on the side (that is, on the filter 90 side), it is arranged separated from the gas generator 70 by the coil spring 73, and the bottom wall portion 61a of the cup body 61 is provided with the curved concave recessed portion 61a1. , The buffer space S1C is located between the ignition unit 41 of the igniter 40 and the closed container 60.

When configured in this way, all of the effects described in the above-described embodiments 2 and 5 can be obtained, and in terms of safety, compactness and weight reduction, and higher performance than before. It can also be a cylinder type gas generator with significantly improved.

(Embodiment 7)
13 is a schematic cross-sectional view of the cylinder type gas generator according to the seventh embodiment, and FIG. 14 is a schematic enlarged cross-sectional view of the vicinity of the bottom wall portion of the cup body of the cylinder type gas generator shown in FIG. .. Hereinafter, the cylinder type gas generator 1G according to the present embodiment will be described with reference to FIGS. 13 and 14.

As shown in FIGS. 13 and 14, the cylinder type gas generator 1G according to the present embodiment is the cylinder type gas generator when compared with the cylinder type gas generator 1A according to the above-described first embodiment. The configuration is mainly different in that the coil spring 80 (see FIG. 1 and the like) provided in 1A is not provided and the shape of the combustion control cover 43 as the directivity imparting member is different.

Specifically, the combustion control cover 43 is provided from the cylindrical portion 43a and the end portion of the tubular portion 43a on the other end side (that is, the filter 90 side) of the housing to the outside in the radial direction of the housing body 10. It includes a flange portion 43b that is extended toward the end. Of these, the tubular portion 43a is located so as to surround the ignition portion 41 of the igniter 40 in the radial direction of the housing body 10, and the flange portion 43b is attached to the bottom wall portion 61a of the cup body 61 of the closed container 60. It is in contact.

As shown in FIG. 14, the combustion control cover 43 is fixed to the holder 20 by being press-fitted into the accommodating portion 21 provided in the holder 20, and the igniter 40 is fitted with the press-fitted combustion control cover 43. It is fixed to the holder 20 by being sandwiched by the holder 20. More specifically, in the combustion control cover 43, the end portion 43a1 located on the side opposite to the side where the flange portion 43b of the cylindrical portion 43a is provided is press-fitted into the accommodating portion 21 of the holder 20. The end portion 43a1 of the tubular portion 43a is in pressure contact with the side surface of the accommodating portion 21. On the other hand, the annular protrusion 41a provided in the ignition portion 41 of the igniter 40 is accommodated in the accommodating portion 21 of the holder 20, and the end portion 43a1 of the tubular portion 43a of the combustion control cover 43 and the accommodating portion of the holder 20. It is sandwiched by a pedestal portion 24 that defines the bottom surface of the 21.

Along with this, in the cylinder type gas generator 1G according to the present embodiment, the caulking portion 23 provided by the holder 20 of the cylinder type gas generator 1A according to the above-described first embodiment (see FIG. 2 and the like). Is not provided. Therefore, with such a configuration, processing for providing the caulking portion 23 on the holder 20 becomes unnecessary, and the manufacturing cost can be reduced.

In the cylinder type gas generator 1G according to the present embodiment, in order to increase the assembling strength of the holder 20 with respect to the housing body 10, the housing body 10 of the portion corresponding to the end portion of the combustion chamber S1 on the holder 20 side is used. A caulking portion 14 is provided. The caulked portion 14 is formed by reducing the diameter of the portion of the housing body 10 inward in the radial direction. As a result, the end portion of the holder 20 on the combustion chamber S1 side is sandwiched along the axial direction of the housing body 10 by the pair of

caulking portions

12, 14 provided on the housing body 10, and the holder 20 is assembled. The strength will be improved. The caulking portion 14 is not always essential, and it may not be provided.

By using the cylinder type gas generator 1G according to the present embodiment described above, in addition to the effects described in the above-described first embodiment, the cylinder type gas generator 1A according to the first embodiment is provided. Since the coil spring 80 that has been used can be eliminated, it is possible to obtain the effect of reducing the number of parts and reducing the weight of the cylinder type gas generator.

Further, in the cylinder type gas generator 1G according to the present embodiment, the end portion of the closed container 60 on the igniter 40 side is positioned by being attached to the flange portion 43b of the combustion control cover 43. Therefore, the gas generator arranged inside the closed container 60 is more than the case where the closed container 60 is fixed by using the coil spring 80 as provided in the cylinder type gas generator 1A according to the first embodiment described above. The distance between the 70 and the igniter 40 is less likely to vary. Therefore, it is possible to obtain a high-performance cylinder type gas generator in which a desired gas output can be stably obtained.

(Embodiment 8)
FIG. 15 is a schematic cross-sectional view of the cylinder type gas generator according to the eighth embodiment. Hereinafter, the cylinder type gas generator 1H according to the present embodiment will be described with reference to FIG. 15.

As shown in FIG. 15, the cylinder type gas generator 1H according to the present embodiment relates to the characteristic configuration of the cylinder type gas generator 1B according to the above-mentioned second embodiment and the above-mentioned embodiment 7. It has the characteristic configuration of the cylinder type gas generator 1G.

Specifically, in the cylinder type gas generator 1H according to the present embodiment, the auto-ignition agent 71 is inside the closed container 60 and is opposite to the side where the gas generator 70 is located when viewed from the coil spring 73. By arranging on the side (that is, on the filter 90 side), the igniter 40 is held by the combustion control cover 43 provided with the tubular portion 43a and the flange portion 43b, while being disposed separated from the gas generating agent 70 by the coil spring 73. While being fixed to 20, the end portion of the closed container 60 on the igniter 40 side is attached to the flange portion 43b of the combustion control cover 43.

When configured in this way, all of the effects described in the above-described embodiments 2 and 7 can be obtained, and in terms of safety, compactness and weight reduction, and higher performance than before. It can also be a cylinder type gas generator with significantly improved.

(Embodiment 9)
16 is a schematic cross-sectional view of the cylinder type gas generator according to the ninth embodiment, and FIG. 17 is a schematic enlarged cross-sectional view of the vicinity of the bottom wall portion of the cup body of the cylinder type gas generator shown in FIG. .. Hereinafter, the cylinder type gas generator 1I according to the present embodiment will be described with reference to FIGS. 16 and 17.

As shown in FIGS. 16 and 17, the cylinder type gas generator 1I according to the present embodiment has the characteristic configuration of the cylinder type gas generator 1E according to the above-mentioned fifth embodiment and the above-mentioned embodiment. It has the characteristic configuration of the cylinder type gas generator 1G according to No. 7.

Specifically, in the cylinder type gas generator 1I according to the present embodiment, the igniting portion 41 of the igniter 40 and the closed container are provided by providing the curved concave recessed portion 61a1 in the bottom wall portion 61a of the cup body 61. The buffer space S1C is located between the 60 and the igniter 40, and the igniter 40 is fixed to the holder 20 by the combustion control cover 43 provided with the cylindrical portion 43a and the flange portion 43b, while the igniter 40 side of the closed container 60 is located. The end portion is fastened to the flange portion 43b of the combustion control cover 43.

When configured in this way, all of the effects described in the above-described embodiments 5 and 7 can be obtained, and the cylinder type gas generator is significantly improved in terms of high performance. Can be.

Further, in the cylinder type gas generator 1I according to the present embodiment, since the recessed portion 61a1 is provided in the bottom wall portion 61a of the cup body 61 as described above, the igniter 40 side of the closed container 60 is provided. The ends will have an annular shape with a concave center. Therefore, in the case of such a configuration, the end portion of the annular closed container 60 comes into contact with the flange portion 43b of the combustion control cover 43 having the same annular shape, so that the flange portion 43b is easily bent. Become.

Therefore, similarly to the coil spring 80 provided in the cylinder type gas generator 1A according to the first embodiment described above, the flange portion 43b of the combustion control cover 43 is a component of various components housed inside the housing. It also functions to absorb dimensional variations. Therefore, with such a configuration, it is possible to obtain the effect of facilitating the dimensional control of various parts at the time of manufacturing.

(Embodiment 10)
FIG. 18 is a schematic cross-sectional view of the cylinder type gas generator according to the tenth embodiment. Hereinafter, the cylinder type gas generator 1J according to the present embodiment will be described with reference to FIG. 18.

As shown in FIG. 18, the cylinder type gas generator 1J according to the present embodiment relates to the characteristic configuration of the cylinder type gas generator 1B according to the above-mentioned second embodiment and the above-mentioned embodiment 9. It has the characteristic configuration of the cylinder type gas generator 1I.

Specifically, in the cylinder type gas generator 1I according to the present embodiment, the auto-ignition agent 71 is inside the closed container 60 and is opposite to the side where the gas generator 70 is located when viewed from the coil spring 73. By arranging it on the side (that is, on the filter 90 side), it is arranged separated from the gas generating agent 70 by the coil spring 73, and the bottom wall portion 61a of the cup body 61 is provided with the curved concave recessed portion 61a1. , The buffer space S1C is located between the ignition portion 41 of the igniter 40 and the closed container 60, and further, the igniter 40 is placed in the holder 20 by the combustion control cover 43 provided with the tubular portion 43a and the flange portion 43b. While being fixed, the end portion of the closed container 60 on the igniter 40 side is attached to the flange portion 43b of the combustion control cover 43.

When configured in this way, all of the effects described in the above-described embodiments 2 and 9 can be obtained, and in terms of safety, compactness and weight reduction, and higher performance than before. It can also be a cylinder type gas generator with significantly improved.

(Embodiment 11)
FIG. 19 is a schematic cross-sectional view of the cylinder type gas generator according to the eleventh embodiment. Hereinafter, the cylinder type gas generator 1K according to the present embodiment will be described with reference to FIG. 19.

As shown in FIG. 19, the cylinder type gas generator 1K according to the present embodiment relates to the characteristic configuration of the cylinder type gas generator 1C according to the above-mentioned third embodiment and the above-mentioned embodiment 10. It has the characteristic configuration of the cylinder type gas generator 1J.

Specifically, in the cylinder type gas generator 1K according to the present embodiment, the autoignition agent 71 is inside the closed container 60 and is opposite to the side where the gas generator 70 is located when viewed from the coil spring 73. By arranging it on the side (that is, on the filter 90 side), it is arranged separated from the gas generating agent 70 by a coil spring 73, and the cover body 62 of the closed container 60 is composed of a non-fragile member. The partition member 50 (see FIG. 1 and the like) provided in the cylinder type gas generator 1A according to the first embodiment is abolished, and the cover body 62 is used as a pressure partition, and further, a cup body. By providing the curved concave recessed portion 61a1 in the bottom wall portion 61a of the 61, the buffer space S1C is located between the ignition portion 41 of the igniter 40 and the closed container 60, and in addition, the tubular portion 43a. The igniter 40 is fixed to the holder 20 by the combustion control cover 43 provided with the flange portion 43b, and the end portion of the closed container 60 on the igniter 40 side is attached to the flange portion 43b of the combustion control cover 43.

When configured in this way, all of the effects described in the above-described embodiments 3 and 10 can be obtained, and in terms of safety, compactness and weight reduction, and higher performance than before. It can also be a cylinder type gas generator with significantly improved.

(Embodiment 12)
FIG. 20 is a schematic cross-sectional view of the cylinder type gas generator according to the twelfth embodiment. Hereinafter, the cylinder type gas generator 1L according to the present embodiment will be described with reference to FIG. 20.

As shown in FIG. 20, the cylinder type gas generator 1L according to the present embodiment has a tubular portion 43a of the combustion control cover 43 when compared with the cylinder type gas generator 1G according to the above-described seventh embodiment. Is different only in that is extended toward the other end side (that is, the filter 90 side) of the housing body 10.

Specifically, in the cylinder type gas generator 1L according to the present embodiment, the tubular portion 43a of the combustion control cover 43 is extended as compared with the cylinder type gas generator 1G according to the above-mentioned embodiment 7. Therefore, the flange portion 43b is located at a greater distance from the ignition portion 41 of the igniter 40, whereby the buffer space S1C is provided inside the combustion control cover 43.

When configured in this way, the distance between the gas generator 70 arranged inside the closed container 60 and the igniter 40 is compared with the cylinder type gas generator 1G according to the seventh embodiment described above. However, there is a possibility that the time from the time when the igniter 40 is operated to the time when the gas starts to be discharged may be delayed due to the lengthening of the gas, but the provision of the buffer space S1C may hinder the opening of the squib cup. Therefore, a high-performance cylinder type gas generator can be obtained by appropriately setting the distance.

Therefore, by using the cylinder type gas generator 1L according to the present embodiment, it is possible to obtain an effect similar to the effect described in the above-mentioned embodiment 7.

(Related form)
FIG. 21 is a schematic cross-sectional view of a cylinder type gas generator according to a related embodiment. 22 and 23 are a schematic enlarged cross-sectional view in the vicinity of the bottom wall portion of the cup body of the cylinder type gas generator shown in FIG. 21, and a schematic enlarged cross-sectional view in the vicinity of the cover body, respectively. First, the configuration of the cylinder type gas generator 1M according to the present related embodiment will be described with reference to FIGS. 21 to 23.

As shown in FIGS. 21 to 23, the cylinder type gas generator 1M according to the present related embodiment has the orientation of the closed container 60 and the direction thereof when compared with the cylinder type gas generator 1G according to the seventh embodiment described above. The configurations and layouts of the various parts housed in the closed container 60 are different.

Specifically, in the cylinder type gas generator 1M according to the present related embodiment, the closed container 60 has the bottom wall portion 61a of the cup body 61 located on the filter 90 side, and the cover body 62 has the igniter 40. It is inserted into the housing body 10 so as to be located on the side. As a result, the bottom wall portion 61a of the cup body 61 faces the partition wall portion 51 of the partition member 50, and the lid portion 62a of the cover body 62 faces the ignition portion 41 of the igniter 40.

Here, as shown in FIG. 22, also in the cylinder type gas generator 1M according to the present embodiment, the tubular portion 43a and the flange portion are similar to the cylinder type gas generator 1G according to the above-described seventh embodiment. The igniter 40 is fixed to the holder 20 by the combustion control cover 43 including 43b, and the end portion of the closed container 60 on the igniter 40 side is attached to the flange portion 43b of the combustion control cover 43.

The end portion of the closed container 60 on the igniter 40 side, which is attached to the flange portion 43b of the combustion control cover 43, is positioned so as to project along the axial direction of the closed container 60 for manufacturing reasons. It is composed of an open end 61b1 of the cup body 61 and a winding portion 62b of the cover body 62. Therefore, since the open end 61b1 of the cup body 61 and the winding portion 62b of the cover body 62 which are positioned so as to protrude serve as spacers, a buffer is provided between the ignition portion 41 of the igniter 40 and the lid portion 62a of the cover body 62. Space S1C will be provided.

As shown in FIGS. 21 to 23, in the gas generating agent accommodating chamber S1A formed inside the closed container 60, the autoignition agent 71 and the partition member 72 are arranged at the end on the partition member 50 side. A coil spring 73 is arranged at the end of the holder 20 side. On the other hand, in the gas generating agent accommodating chamber S1A formed inside the closed container 60, the gas generating agent 70 is arranged in a portion other than the end portion on the partition member 50 side and the end portion on the holder 20 side. ..

As shown in FIG. 23, the partition member 72 is a member for partitioning the gas generating agent accommodating chamber S1A in the axial direction of the housing. The partition member 72 has a positioning recess 72a in a portion facing the partition member 50 in the axial direction of the peripheral wall portion of the housing main body 10, and has a skirt-shaped fixing cylinder portion 72b on the outer edge. Further, at the bottom of the positioning recess 72a of the partition member 72, a pair of spaces partitioned by the partition member 72 (that is, a space in which the gas generating agent 70 is housed and a space in which the autoignition agent 71 is housed) are mutually formed. A single or a plurality of through holes 72c are provided for communicating with the through hole 72c.

Here, the partition member 72 is preferably made of a metal press-molded product, and is made of a brass member that does not break or melt even when the gas generating agent 70 is burned, for example. preferable. However, the partition member 72 does not necessarily have to be made of brass, and the partition member 72 may be formed of stainless steel, steel, iron, aluminum, an aluminum alloy, or the like.

It should be noted that the partition member 72 does not necessarily have to be provided with a through hole 72c, and by providing a score in the partition member 72, a through hole is formed in the partition member 72 with the combustion of the gas generating agent 70. It may be configured as follows. Further, the partition member 72 itself may be made of a fragile member that breaks or melts due to the combustion of the gas generating agent 70 without providing a through hole or a score in the partition member 72.

The partition member 72 is inserted into the side wall portion 61b of the cup body 61 of the closed container 60, and the fixing cylinder portion 72b of the partition member 72 is in contact with the inner peripheral surface of the side wall portion 61b. That is, the partition member 72 is press-fitted into the side wall portion 61b of the cup body 61, whereby the partition member 72 is fixed to the closed container 60.

A part of the autoignition agent 71 formed into pellets is housed in the positioning recess 72a provided in the partition member 72. As a result, the auto-ignition agent 71 is sandwiched between the bottom portion of the positioning recess 72a of the partition member 72 and the bottom wall portion 61a of the cup body 61. Therefore, the auto-ignition agent 71 comes into contact with both the partition member 72 and the cup body 61.

With this configuration, the auto-ignition agent 71 is located between the housing body 10 and the partition member 72, which is a metal member, and the end portion of the closed container 60, which is a metal member, near the bottom wall portion 61a. And through the partition member 50, which is a metal member, thermal contact is made in a substantially shortest path.

Next, with reference to FIG. 21, the operation of the cylinder type gas generator 1M according to the present embodiment during operation will be described.

With reference to FIG. 21, when a vehicle equipped with the cylinder type gas generator 1M according to the present embodiment collides, the collision is detected by a collision detecting means separately provided for the vehicle, and based on this, the collision is detected. The igniter 40 is operated by energization from a control unit separately provided in the vehicle.

When the igniter 40 is activated, the pressure in the igniter 41 rises due to the combustion of the igniter or the igniter in addition to the igniter, which causes the squib cup of the igniter to open and the igniter to burn. The generated heat particles flow out to the outside of the ignition unit 41.

Directivity is given to the heat particles flowing out from the ignition unit 41 by the tubular portion 43a of the combustion control cover 43 described above, which leads to the lid portion 62a of the cover body 62 of the closed container 60. Along with this, the lid portion 62a of the cover body 62 melts or bursts due to the heat or pressure generated by the operation of the igniter 40, and the above-mentioned heat particles reach the gas generating agent 70.

The heat particles that have reached the gas generating agent 70 burn the gas generating agent 70, whereby a large amount of gas is generated. Along with this, the pressure and temperature of the gas generating agent accommodating chamber S1A rise, the side wall portion 61b of the cup body 61 of the closed container 60 bursts or melts, the autoignition agent 71 burns, and further, the cup of the closed container 60. The bottom wall portion 61a of the body 61 bursts or melts.

Then, the gas after passing through the filter 90 is ejected to the outside of the housing through the gas ejection port 11. The ejected gas is introduced into an airbag provided adjacent to the cylinder type gas generator 1M, and expands and expands the airbag.

In the cylinder type gas generator 1M according to the present related embodiment described above, as described above, the igniter 40 is fixed to the holder 20 by the combustion control cover 43 provided with the tubular portion 43a and the flange portion 43b. The end of the closed container 60 on the igniter 40 side is attached to the flange portion 43b of the combustion control cover 43. Therefore, processing for providing the caulking portion 23 (see FIG. 2 and the like) on the holder 20 becomes unnecessary, and the manufacturing cost can be reduced.

Further, in the cylinder type gas generator 1M according to the present related embodiment, the end portion of the closed container 60 on the igniter 40 side is positioned by being attached to the flange portion 43b of the combustion control cover 43. , The distance between the gas generator 70 arranged inside the closed container 60 and the igniter 40 is less likely to vary than when the closed container 60 is fixed using the coil spring 80 (see FIG. 1 and the like). .. Therefore, it is possible to obtain a high-performance cylinder type gas generator in which a desired gas output can be stably obtained.

Further, in the cylinder type gas generator 1M according to the present related embodiment, the open end 61b1 of the cup body 61 and the winding portion 62b of the cover body 62, which are positioned so as to project, are provided at the end of the closed container 60 on the igniter 40 side. Since the closed container 60 is provided, the end portion of the closed container 60 on the igniter 40 side has an annular shape with a recessed central portion. Therefore, in the case of such a configuration, the end portion of the annular closed container 60 comes into contact with the flange portion 43b of the combustion control cover 43 having the same annular shape, so that the flange portion 43b is easily bent. Become.

(Other forms, etc.)
In the above-described embodiments and related embodiments of the present invention, the present invention is applied to a cylinder type gas generator configured such that a heat insulating layer is formed inside the housing and radially outside the closed container. However, the heat insulating layer is not necessarily an indispensable configuration. That is, the present invention can naturally be applied to a cylinder type gas generator that is not provided with the heat insulating layer as described above. In that case, the closed container is press-fitted into the housing body to form the housing body. The side wall of the closed container comes into contact with the inner peripheral surface of the closed container.

Further, the characteristic configurations shown in the above-described embodiments and related embodiments of the present invention can naturally be combined with each other as long as they do not deviate from the gist of the present invention.

Further, in the above-described embodiments and related embodiments of the present invention, the case where the present invention is applied to a cylinder type gas generator incorporated in a side airbag device has been described as an example, but the present invention has been applied. The target is not limited to this, but the cylinder type gas generator incorporated in the curtain airbag device, knee airbag device, seat cushion airbag device, etc., and the long outer shape like the cylinder type gas generator. It can also be applied to the so-called T-shaped gas generator that has.

As described above, the above-described embodiment disclosed this time is an example in all respects and is not restrictive. The technical scope of the present invention is defined by the scope of claims and includes all modifications within the meaning and scope of the description of the claims and the equivalent.

1A-1M cylinder type gas generator, 10 housing body, 11 gas outlet, 12-14 caulking part, 20 holder, 21 accommodating part, 22 annular groove part, 23 caulking part, 24 pedestal part, 30 closing member, 31 annular groove part , 40 igniter, 41 ignition part, 41a annular protrusion, 42 terminal pin, 43 combustion control cover, 43a tubular part, 43a1 end part, 43b flange part, 50 partition member, 51 partition wall part, 51a communication hole, 51b score , 52 annular wall, 60 closed container, 61 cup body, 61a bottom wall part, 61a1 recess, 61b side wall part, 61b1 opening end, 62 cover body, 62a lid part, 62a1 score, 62b entanglement part, 62b1 first caulking Part, 62b2 2nd caulking part, 70 gas generating agent, 71 auto-ignition agent, 72 partition member, 72a positioning recess, 72b fixing cylinder part, 72c through hole, 73 coil spring, 73a spring part, 73b pressing part, 80 coil spring , 90 filter, 91 hollow part, S1 combustion chamber, S1A gas generating agent storage chamber, S1B heat insulating layer, S1C buffer space, S2 filter chamber.

Claims

A long housing with a cylindrical peripheral wall with one end and the other end closed in the axial direction.
With the gas generating agent placed inside the housing,
An igniter attached to the closed end located on the one end side of the housing, and
A filter located inside the housing and on the other end side of the housing.
A closed container that is located inside the housing and is located between the igniter and the filter and defines a gas generating agent storage chamber in which the gas generating agent is housed.
A cup body in which the closed container includes a cylindrical side wall portion arranged substantially coaxially with the housing and a bottom wall portion that closes one axial end portion of the side wall portion, and the other shaft of the cup body. It has a cover body that closes the open end by being attached to the open end, which is the directional end.
The cup body is composed of a fragile member that melts or bursts due to the heat or pressure generated by the operation of the igniter.
The bottom wall portion of the cup body is arranged on the igniter side.
A gas generator in which the cover body is arranged on the filter side.
Further provided with an elastic urging member arranged inside the closed container and elastically urging the gas generating agent to immobilize the gas generating agent inside the closed container.
The gas generator according to claim 1, wherein the elastic urging member is arranged at an end portion of the closed container on the cover body side so as to be located between the cover body and the gas generator.
Further equipped with an auto-ignition agent which is arranged inside the closed container and automatically ignites regardless of the operation of the igniter.
By arranging the autoignition agent on the side opposite to the side where the gas generator is located when viewed from the elastic urging member, the gas generator and the autoignition agent are separated by the elastic urging member. The gas generator according to claim 2.
The gas generator according to claim 2 or 3, wherein the elastic urging member comprises a coil spring.
The cover body is composed of a fragile member that melts or explodes due to heat or pressure generated by the operation of the igniter.
The gas generator according to any one of claims 1 to 4, wherein a pressure bulkhead provided with a communication hole is provided between the closed container and the filter.
The cover body is composed of a non-fragile member that does not melt or explode due to heat or pressure generated by the operation of the igniter.
By providing the cover body with a fragile portion in which a communication hole is formed by operating the igniter, a pressure bulkhead made of a member different from the cover body is provided with the closed container and the filter. The gas generator according to any one of claims 1 to 4, which is not provided between the two.
The cup body is made of a member made of an aluminum-based material.
The cover body is composed of a member made of an iron-based material covered with a film of an aluminum-based material.
The gas generator according to claim 6, wherein the cup body and the cover body are joined so as to be in direct contact with each other.
The gas generator according to any one of claims 1 to 7, wherein a curved concave recess is provided in a portion of the bottom wall portion facing the igniter.
The igniter has an igniter loaded with an igniter and a terminal pin connected to the igniter.
Further provided with a directivity imparting member for guiding the heat particles to the closed container by giving directivity to the traveling direction of the heat particles generated in the ignition portion.
The directivity-imparting member has a cylindrical portion that surrounds the ignition portion in the radial direction of the peripheral wall portion, and a flange portion that extends outward from the end portion of the tubular portion on the filter side. ,
The gas generator according to any one of claims 1 to 8, wherein the bottom wall portion is in contact with the flange portion.
The housing has a holder that constitutes the closed end.
The holder comprises an accommodating portion that opens toward the space inside the housing.
The ignition portion includes an annular protrusion that is housed in the housing and projects outward along the radial direction of the housing.
The end of the cylindrical portion located on the side opposite to the side on which the flange portion is provided is inserted into the accommodating portion.
The end portion of the tubular portion inserted into the accommodating portion is in pressure contact with the side surface of the accommodating portion, and the annular protrusion is brought into the accommodating portion of the tubular portion. The gas generator according to claim 9, wherein the gas generator is sandwiched between the end portion of the inserted portion and the bottom surface of the accommodating portion.