JP7238302B2 - gas generator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gas generator that burns a gas generating agent to generate combustion gas by an ignition device, and a cushion member for the gas generator.

2. Description of the Related Art Gas generators are known which supply combustion gas generated by burning a gas generating agent as a power source for realizing desired operations. The gas generator supplies the combustion gas generated by burning the gas generating agent in the combustion chamber in the housing by the operation of the ignition device to the outside from the gas outlet provided in the housing. In such gas generators, a filter is arranged between the combustion chamber and the gas outlet for cooling and filtering the combustion gases. A cushion member is arranged in the combustion chamber to prevent the gas generating agent from being pulverized due to vibration or the like.

Patent Literature 1 discloses a gas generator that supplies combustion gas generated by burning a gas generating agent filled in a combustion chamber of a housing to the outside from a gas ejection port provided in the housing. In the gas generator, a filter is arranged between the combustion chamber and the gas outlet. Also, a member is disposed within the combustion chamber. A support member is arranged between the filter and the cushion member.

WO2015/163290

By the way, in the gas generator, there is a possibility that a part of the combustion gas does not pass through the filter but passes through the gap between the filter and the housing to reach the gas discharge port, which is a so-called "short path". In order to suppress the short pass, for example, a support member may be arranged in the combustion chamber where a gap between the filter and the housing may occur. However, in the gas generator, if the support member is arranged in the combustion chamber in order to suppress the short pass, the number of parts increases by the support member. Moreover, when the support member and the cushion member are assembled in the housing, the support member may hide the cushion member, making it difficult to check whether the cushion member is properly arranged. As described above, in the conventional gas generator, there is a trade-off relationship between the suppression of short path and the structure that is easy to assemble, and there is a problem that both cannot be achieved at the same time.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a gas generator capable of suppressing a short pass while having a structure that is easy to assemble, and a cushion member used therein.

In order to solve the above problems, the present invention includes a cylindrical filter and a cushion member, wherein at least a part of the outer peripheral portion of the cushion member extends around the entire circumference between the first wall portion and one end portion of the filter. The inner region of the cushion member surrounded by the outer peripheral portion is placed in contact with the gas generating agent filled in the combustion chamber. With such a configuration, short paths can be suppressed while facilitating assembly.

Specifically, the gas generator of the present invention includes an ignition device arranged in a housing, and an opening formed in at least one end of both ends, in which a gas generating agent to be combusted by the ignition device is placed. a cylindrical filter including a combustion chamber to be filled; a gas discharge port provided in the housing so that the filter is positioned between the combustion chamber and communicating between the inside and the outside of the housing; and a cushion member made of a deformable or plastically deformable material and applying a biasing force to the gas generating agent filled in the combustion chamber. At least part of the outer peripheral portion of the cushion member is sandwiched between the first wall portion and the one end portion of the filter over the entire circumference, and the inner region of the cushion member surrounded by the outer peripheral portion is It is arranged in contact with the gas generating agent filled in the combustion chamber through the opening.

In the gas generator of the present invention, at least part of the outer peripheral portion of the cushion member is sandwiched between the first wall portion and one end portion of the filter over the entire circumference, thereby suppressing short-pass of combustion gas. can be done. A short pass of combustion gas can occur due to a gap between the housing and the filter. can do. In addition, in the gas generator of the present invention, the cushion member also functions as a support member for suppressing a short pass. do not increase Further, in the gas generator of the present invention, since the support member is not arranged inside the housing, the support member does not hide the cushion member, and it is possible to check whether the cushion member is properly arranged. can be made easier. Thereby, the gas generator of the present invention can be configured to be easily assembled.

Moreover, the gas generator described above may further include a dividing wall that vertically divides the space within the housing. The filter is arranged in one of the spaces within the housing divided by the dividing wall, and at least a portion of the outer peripheral portion of the cushion member is a part of the housing over its entire circumference. is sandwiched between the first wall portion and the one end portion of the filter, or between the first wall portion that is a part of the dividing wall and the one end portion of the filter over its circumference It may be sandwiched.

The cushion member may be disposed at a position such that at least a portion of the outer peripheral portion is sandwiched between a portion of the housing and the one end portion of the filter over the entire circumference. In this case, part of the housing becomes the "first wall". Further, the cushion member may be arranged at a position sandwiched between a portion of the dividing wall and the one end of the filter over the entire circumference of the outer peripheral portion. In this case, part of the dividing wall becomes the "first wall". With this configuration as well, short paths can be suppressed while facilitating assembly.

Further, in the gas generator up to the above, the outer peripheral portion of the cushion member has an outer portion including a circumference of the outer peripheral edge of the cushion member and an inner portion covering an inner circumference of the outer portion, and the outer portion is sandwiched between a portion of the housing different from the first wall and the outside of the filter, the inner portion being sandwiched between the first wall and the one end of the filter. It may be sandwiched.

In the gas generator of the present invention having this configuration, only the outer portion of the cushion member sandwiched between a portion of the housing and the filter is added. Therefore, in the gas generator of the present invention, only the outer portion of the pinched cushion member that can suppress the short pass can be added, and the short pass can be further suppressed. Moreover, it can be set as a structure easy to assemble.

Here, the present invention can be viewed from the side of a cushion member for a gas generator. That is, the present invention is a cushion member for a gas generator. Specifically, a housing, an ignition device disposed in the housing, and a combustion chamber having at least one open end and filled with a gas generating agent to be combusted by the ignition device. and a gas discharge port provided in the housing so that the filter is positioned between the combustion chamber and communicating the inside and the outside of the housing. It is a member. The cushion member of the present invention is formed of a material that undergoes elastic or plastic deformation, and when placed in the gas generator, at least a portion of the outer peripheral portion of the cushion member extends around the first wall. The inner region of the cushion member sandwiched between the portion and the one end portion and surrounded by the outer peripheral portion is in contact with the gas generating agent filled in the combustion chamber through the opening. The outer peripheral portion is thinner than the inner region.

According to the present invention, it is possible to suppress short paths while facilitating assembly.

1 is a diagram showing a schematic configuration of a gas generator according to Example 1. FIG. 4 is a view showing the vicinity of the filter of the gas generator according to Example 1. FIG. FIG. 10 is a view showing the vicinity of a filter of a gas generator according to Example 2; FIG. 10 is a view showing the vicinity of a filter of a gas generator according to Example 3; FIG. 10 is a diagram showing a cushion member for a gas generator according to Example 4; FIG. 10 is a diagram showing a schematic configuration of a gas generator according to Example 5;

A gas generator according to an embodiment of the present invention will be described below with reference to the drawings. The configurations of the following embodiments are examples, and the present invention is not limited to the configurations of these embodiments.

<Example 1>
FIG. 1 is a cross-sectional view in the height direction of a gas generator 1 according to Example 1. FIG. The gas generator 1 is configured to burn a gas generating agent filled in a housing 4 formed by an upper shell 2 and a lower shell 3 to emit combustion gas. The gas generator 1 is a so-called dual-type gas generator in which two combustion chambers are arranged vertically as described later, and a corresponding igniter and gas generating agent are arranged in each combustion chamber. The upper shell 2 has a large-diameter peripheral wall portion 2c, a small-diameter peripheral wall portion 2d, and a top surface portion 2e, which form a concave internal space. The top surface portion 2e, together with the bottom surface portion 3b of the lower shell 3, which will be described later, has a generally circular shape when viewed from above. The large-diameter peripheral wall portion 2c and the small-diameter peripheral wall portion 2d form an annular wall surface that surrounds the top surface portion 2e and extends substantially perpendicularly from the top surface portion 2e. The internal space of the upper shell 2 is a space filled with the first gas generating agent 22 as described later. One end side (upper side in FIG. 1) of the small-diameter peripheral wall portion 2d is connected to the top surface portion 2e, and the other end side (lower side in FIG. 1) is connected to the large-diameter peripheral wall portion 2c having a larger diameter than the small-diameter peripheral wall portion 2d. . The radius of the internal space defined by the large-diameter peripheral wall portion 2c is formed to be larger than the radius of the internal space defined by the small-diameter peripheral wall portion 2d. The other end side (lower side in FIG. 1) of the large-diameter peripheral wall portion 2c serves as an opening of the upper shell 2. As shown in FIG. A fitting wall portion 2a and an abutment portion 2b are provided in order from the opening on the other end side of the large-diameter peripheral wall portion 2c. The radius of the internal space defined by the fitting wall portion 2a is formed to be larger than the radius of the internal space defined by the large-diameter peripheral wall portion 2c. there is

The lower shell 3 has a peripheral wall portion 3a and a bottom portion 3b, which form a concave internal space. The internal space becomes the second combustion chamber 25 filled with the second gas generating agent 26 . The bottom surface portion 3b is connected to one end side of the peripheral wall portion 3a, and the other end side serves as an opening of the lower shell 3. As shown in FIG. The radius of the internal space defined by the peripheral wall portion 3a is substantially the same as the radius of the internal space defined by the large-diameter peripheral wall portion 2c of the upper shell 2. As shown in FIG. The bottom surface portion 3b of the lower shell 3 is provided with holes to which the first igniter 23 and the second igniter 27 are respectively fixed.

Furthermore, a dividing wall 10 is arranged within the housing 4 between the upper shell 2 and the lower shell 3 . The dividing wall 10 includes a terminal end portion 15, a dividing wall portion 14 connected to the terminal end portion 15 and dividing the interior of the housing 4 into upper and lower spaces, and an accommodating wall member (accommodating wall) 16 which is connected to the dividing wall portion 14 and will be described later. and an end portion 12 arranged to partially cover the opening of the housing wall member 16 . Note that the end portion 12 forms a through hole 11 . A cylindrical housing wall member 16 is provided on the bottom surface portion 3b so as to surround the first igniter 23 attached to the bottom surface portion 3b of the lower shell 3 in the height direction. The upper opening of the housing wall member 16 is covered with the end 12 of the dividing wall 10 . A through hole 17 is provided in the housing wall member 16, and the through hole 17 communicates two spaces (the first combustion chamber 21 and the second combustion chamber 25) formed by being divided by the dividing wall 10. do. The through hole 17 is closed with an aluminum tape 37 from the first igniter 23 arrangement side before the second igniter 27 is activated.

A transfer charge may be filled inside the cylindrical containing wall member 16 around the first igniter 23 . As the transfer charge, for example, a granular or cylindrical one containing nitroguanidine (34% by weight) and strontium nitrate (56% by weight) can be used. Further, when the transfer charge is filled, the through hole 11 is closed with an aluminum tape or the like to prevent the transfer charge and the first gas generating agent 22 from being mixed. The gas generator 1 according to this embodiment includes a first igniter 23 as an ignition device. The ignition device may be composed of only the first igniter 23, or may be composed of the first igniter 23 and transfer charge.

Then, in the state where the dividing wall 10 is attached on the lower shell 3 in this way, the upper shell 2 is further attached from above. As described above, the radius of the internal space defined by the fitting wall portion 2a of the upper shell 2 is formed to be larger than the radius of the internal space defined by the large-diameter peripheral wall portion 2c. It is fitted against the lower shell 3 until it abuts against the terminal end 15 of the wall 10 . In the housing 4, the fitting and contacting portions of the upper shell 2 and the lower shell 3 are joined by a suitable joining method (for example, welding) to prevent moisture from the gas generating agent filled inside. .

In this way, in the housing 4 , the internal space is generally divided into two spaces vertically by the dividing wall 10 . A first igniter 23 and a first gas generating agent 22 are arranged in the first combustion chamber 21 of the internal space of the housing 4, and a second igniter 27 and a second gas generating agent are arranged in the second combustion chamber 25. 26 is arranged, the gas generator 1 is configured as a dual-type gas generator including two first igniters 23 and a second igniter 27 . In addition, both the first igniter 23 and the second igniter 27 are fixed on the bottom surface portion 3b of the lower shell 3, so that the first igniter 23 is located on the side of the housing wall member. It is surrounded by 16. In addition, the 1st igniter 23 should just be arrange|positioned in the housing 4 so that the 1st gas generating agent 22 can be burned. Similarly, the second igniter 27 may be arranged inside the housing 4 so as to burn the second gas generating agent 26 .

Here, in the first combustion chamber 21, the internal space of the containing wall member 16 (the space defined by the inner side of the containing wall member 16 and the bottom surface portion 3b of the lower shell 3, which opens upward). The first igniter 23 is accommodated in the space), and the space above it is filled with the first gas generating agent 22 . A cylindrical filter 32 is arranged to surround the first combustion chamber 21 . The filter 32 has a tubular shape with both ends opened, and includes the first combustion chamber 21 therein. Also, the filter 32 is arranged between the gas outlet 5 and the first combustion chamber 21 . A plurality of gas discharge ports 5 are provided in the large-diameter peripheral wall portion 2c so that the filter 32 is positioned between them and the first combustion chamber 21 .

A cushion member 31 is arranged inside the first combustion chamber 21 . The cushion member 31 is made of a material that deforms elastically or plastically, and applies a biasing force to the first gas generating agent 22 filled in the first combustion chamber 21 . The first gas generating agent 22 is filled in the first combustion chamber 21 while being pressed against the filter 32, the dividing wall portion 14, etc. by the biasing force of the cushion member 31 so as not to vibrate unnecessarily. The first gas generating agent 22 uses a gas generating agent with a relatively low combustion temperature. The combustion temperature of the first gas generating agent 22 is desirably in the range of 1000 to 1700°C. A single-hole cylinder can be used. The internal space of the housing wall member 16 may be filled with a gas generating agent having a composition different from that of the first gas generating agent 22 . In this case, the composition of the gas generating agent filled in the inner space of the containing wall member 16 is configured so that the combustion temperature is higher than that of the first gas generating agent 22 in order to facilitate the ignition of the first gas generating agent 22. can be

The filter 32 is formed by radially stacking stainless steel flat-woven wire meshes and compressing them in the radial and axial directions, and cools the combustion gas generated by the first gas generating agent 22 and collects the combustion residue. (filter). Alternatively, the filter 32 may have a wound type structure formed by winding a wire around a mandrel in multiple layers. The filter 32 also collects combustion residues of the second gas generating agent 26 filled in the second combustion chamber 25 . A gap 33 formed between the large-diameter peripheral wall portion 2 c of the upper shell 2 and the filter 32 forms an annular gas passage in a radial cross section around the filter 32 . This gap 33 allows the combustion gas to pass through the entire area of the filter 32, achieving effective use of the filter 32 and effective cooling and filtration (purification) of the combustion gas. The combustion gas flowing through the gap 33 reaches the gas discharge port 5 provided in the large-diameter peripheral wall portion 2c. In order to prevent moisture from entering the housing 4 from the outside, the gas outlet 5 is blocked from the inside of the housing 4 with an aluminum tape 34 before the gas generator 1 is activated.

Also, in the second combustion chamber 25, a second gas generating agent 26 is filled corresponding to a second igniter 27 fixed to the bottom surface portion 3b of the lower shell 3. As shown in FIG. A cushion member 35 is arranged inside the second combustion chamber 25 . The cushion member 35 is made of a material that deforms elastically or plastically, and applies a biasing force to the second gas generating agent 26 filled in the second combustion chamber 25 . In this manner, the second gas generating agent 26 is also filled in the second combustion chamber 25 while being biased by the cushion member 35 so as not to vibrate unnecessarily. Similarly to the first gas generating agent 22, the second gas generating agent 26 is also composed of guanidine nitrate (41% by weight), basic copper nitrate (49% by weight), a binder, and additives. can be used.

The cushion members 31 and 35 are made of a resin material such as ethylene propylene diene rubber or silicon rubber, an inorganic material such as ceramic fiber, or a metal material such as a knitted wire mesh. The cushion members 31 and 35 may be made of elastically or plastically deformable material that is difficult to burn or that does not generate undesirable gas when burned.

Further, the area around the second igniter 27 may be filled with transfer charge. As the transfer charge, for example, a granular or cylindrical one containing nitroguanidine (34% by weight) and strontium nitrate (56% by weight) can be used. Further, when a transfer charge is charged, a predetermined member is arranged to separate the transfer charge and the second gas generation agent 26 so that the transfer charge and the second gas generation agent 26 are not mixed. The gas generator 1 according to this embodiment includes a second igniter 27 as an ignition device. The ignition device may be composed only of the second igniter 27, or may be composed of the second igniter 27 and transfer charge.

With such a configuration, in the gas generator 1, the combustion of the first gas generating agent 22 by the operation of the first igniter 23 and the combustion of the second gas generating agent 26 by the operation of the second igniter 27 cause external The form of discharge of the combustion gases to the can be adjusted in a variety of ways. Further, the gas generator 1 can generate a relatively large amount of combustion gas and discharge it to the outside.

Next, the cushion member 31 and the filter 32 are described in detail with reference to FIG. FIG. 2 is a cross-sectional view in the height direction near the filter 32 in the gas generator 1 according to this embodiment. In this embodiment, the filter 32 has a tubular shape with openings of the same size formed at both ends on the upper end 32a side and the lower end 32b side, and includes the first combustion chamber 21 therein. . The opening on the upper end portion 32a side of the filter 32 faces the cushion member 31, and the opening on the lower end portion 32b side of the filter 32 faces the dividing wall portion 14 and the like. The inside of the filter 32 faces the first combustion chamber 21, and the outside of the filter 32 is the gas discharge port 5 and the large diameter peripheral wall portion 2.
c, the small-diameter peripheral wall portion 2d, and the like. The outer periphery of the filter 32 on the side of the top surface 2e (upper side) is in contact with the small-diameter peripheral wall portion 2d, and the outer periphery of the filter 32 on the side of the dividing wall portion 14 (lower side) is connected to the dividing wall portion 14 of the end portion 15. It is in contact with an inner end portion 15a extending from the dividing wall portion 14 in the direction of the top surface portion 2e. Further, the upper end portion 32a of the filter 32 is in contact with the outer peripheral portion 31a of the cushion member 31, and the lower end portion 32b of the filter 32 is in contact with the dividing wall portion .

The cushion member 31 is arranged on the side of the top surface portion 2e, and has a substantially circular shape when viewed from above, like the top surface portion 2e. The cushion member 31 has an outer peripheral portion 31a including a circular outer peripheral edge and an inner region 31b surrounded by the outer peripheral portion 31a. The outer peripheral portion 31a is sandwiched between the top surface portion 2e and the upper end portion 32a of the filter 32 over its entire circumference. In this embodiment, the top surface portion 2e corresponds to the "first wall portion". The inner region 31b is in contact with the first gas generating agent 22 through the opening of the filter 32 on the upper end portion 32a side.

In this embodiment, the cushion member 31 has a uniform thickness prior to assembly within the housing 4 . The cushion member 31 is made of an elastically or plastically deformable material, and is deformable in the thickness direction. Therefore, when the outer peripheral portion 31a is sandwiched between the top surface portion 2e and the upper end portion 32a of the filter 32, the outer peripheral portion 31a is compressed in the thickness direction and becomes thinner than the inner region 31b. The outer peripheral portion 31a compressed in the thickness direction has a higher density than the inner region 31b, and is less susceptible to thermal effects such as melting due to the heat generated when the first gas generating agent 22 is burned. Therefore, the outer peripheral portion 31a of the cushion member 31 in particular remains between the top surface portion 2e and the upper end portion 32a of the filter 32 without melting or the like even during the combustion of the first gas generating agent 22. Short pass of the combustion gas can be suppressed by not forming a gap between the .

In the gas generator 1 according to this embodiment, the outer peripheral portion 31a of the cushion member 31 is sandwiched between a portion of the housing 4 (top surface portion 2e) and one end portion of the filter 32 (upper end portion 32a). , the short pass of the combustion gas can be suppressed. A short pass of the combustion gas may occur due to a gap between the housing 4 and the filter 32, but the gas generator 1 prevents the gap from being created by the outer peripheral portion 31a of the cushion member 31, thereby preventing the short path. Passes can be suppressed. In addition, in the gas generator 1 according to the present embodiment, the cushion member 31 also functions as a support member for suppressing a short pass. Do not increase the number of parts by the amount of Further, if the support member is made of metal, if the support member is arranged in the housing 4, the support member may vibrate due to vibrations from the outside of the gas generator 1, causing an abnormal noise. The gas generator 1 according to the embodiment does not use the support member, and can prevent the generation of abnormal noise due to vibration. In addition, since the gas generator 1 does not have the support member arranged in the housing 4, the cushion member 31 can be easily confirmed in a top view after the cushion member 31 is assembled and before the upper shell 2 is assembled. This makes it easy to check whether the cushion member 31 is properly arranged.

As described above, the gas generator 1 according to the present embodiment can be configured to be easily assembled while suppressing short-path.

The filter 32 is arranged in the space in which the gas discharge port 5 is formed, of the spaces inside the housing 4 divided by the dividing wall 10 . In this embodiment, the gas discharge port 5 is formed in the space on the upper side (upper shell 2 side) of the divided spaces within the housing 4 .

<Example 2>
Next, the gas generator 1 according to Example 2 will be described with reference to FIG. The gas generator 1 according to this embodiment has the same configuration as the gas generator 1 according to the first embodiment except that the cushion member 31 is arranged on the dividing wall 14 side.

FIG. 3 is a cross-sectional view in the height direction near the filter 32 in the gas generator 1 according to this embodiment. As shown in FIG. 3, the cushion member 31 is arranged on the dividing wall portion 14 side. The cushion member 31 has the same shape as the dividing wall portion 14 when viewed from above, and is arranged on the entire surface of the dividing wall portion 14 . Thus, in the first combustion chamber 21, the cushion member 31 may be arranged on the dividing wall portion 14 side. In this case, the first gas generating agent 22 is filled in the first combustion chamber 21 while being pressed against the filter 32, the top surface portion 2e, etc. by the biasing force of the cushion member 31 so as not to vibrate unnecessarily.

The outer peripheral portion 31a of the cushion member 31 is sandwiched between the dividing wall portion 14 and the lower end portion 32b of the filter 32 over its entire circumference. In this embodiment, the dividing wall portion 14 corresponds to the "first wall portion". In addition, the inner region 31b is in contact with the first gas generating agent 22 through the opening of the filter 32 on the lower end portion 32b side. Further, the upper end portion 32a of the filter 32 is in contact with the top surface portion 2e, and the lower end portion 32b of the filter 32 is in contact with the outer peripheral portion 31a of the cushion member 31. As shown in FIG.

In the gas generator 1 according to this embodiment, the outer peripheral portion 31a of the cushion member 31 is sandwiched between a portion of the dividing wall 10 (dividing wall portion 14) and one end portion of the filter 32 (lower end portion 32b). As a result, the short pass of the combustion gas can be suppressed. A short pass of combustion gas may occur due to a gap between the housing 4 and the dividing wall portion 14. , can suppress short passes. In addition, in the gas generator 1 according to the present embodiment, the cushion member 31 also functions as a support member for suppressing a short pass. Do not increase the number of parts by the amount of Moreover, since the gas generator 1 does not arrange the support member inside the housing 4, it is possible to easily check whether the cushion member 31 is appropriately arranged.

As described above, the gas generator 1 according to the present embodiment can be configured to be easily assembled while suppressing short-path.

<Example 3>
Next, the gas generator 1 according to Example 3 will be described with reference to FIG. In the gas generator 1 according to this embodiment, the outside of the outer peripheral portion 31a of the cushion member 31 is sandwiched between a part of the housing 4 (the small-diameter peripheral wall portion 2d) and the outside of the filter 32, except for this point. and has the same configuration as the gas generator 1 according to the first embodiment.

FIG. 4 is a cross-sectional view in the height direction near the filter 32 in the gas generator 1 according to this embodiment. As shown in FIG. 4 , the outer peripheral portion 31 a of the cushion member 31 has an outer portion 311 that includes the outer peripheral edge of the cushion member 31 and an inner portion 312 that covers the inner side of the outer portion 311 . The outer portion 311 is sandwiched between the small-diameter peripheral wall portion 2 d and the outside of the filter 32 . The inner portion 312 is sandwiched between the top surface portion 2 e and the upper end portion 32 a of the filter 32 . In this embodiment, the top surface portion 2e corresponds to the "first wall portion".

When the cushion member 31 is assembled to the housing 4, the outside of the outer peripheral portion 31a is bent along the small-diameter peripheral wall portion 2d, so that the outer portion (peripheral edge side) of the bent portion of the outer peripheral portion 31a becomes the outer portion 311. The inner portion 312 is the inner portion from the location.

In the gas generator 1 according to this embodiment, the outer portion 311 of the outer peripheral portion 31a of the cushion member 31 is sandwiched between the small-diameter peripheral wall portion 2d of the housing 4 and the outside of the filter 32, and the inner portion 312 of the outer peripheral portion 31a is By sandwiching between the top surface portion 2e of the housing 4 and one end portion (upper end portion 32a) of the filter 32, it is possible to suppress a short pass of the combustion gas. The gas generator 1 according to the present embodiment has a longer length than the gas generator 1 according to the first embodiment, where the cushion member 31 is sandwiched between a part of the housing 4 and the filter 32 and compressed. The length is increased by the outer portion 311 . Therefore, in the gas generator 1 according to this embodiment, the portion of the clamped and compressed cushion member 31 that can suppress the short pass can be lengthened by the outer portion 311, thereby further suppressing the short pass. can do. Moreover, the gas generator 1 according to the present embodiment can be configured to be easily assembled as in the first embodiment.

As described above, the gas generator 1 according to the present embodiment can be configured to be easily assembled while suppressing short-path.

<Example 4>
Next, a cushion member 31 for a gas generator according to Example 4 will be described with reference to FIG. The cushion member 31 according to this embodiment can be used in the gas generator according to Embodiments 1 to 3 and Embodiment 5 which will be described later.

FIG. 5A is a top plan view of the cushion member 31 according to this embodiment. The cushion member 31 has a generally circular shape when viewed from above, and has an outer peripheral portion 31a and an inner region 31b. The cushion member 31 having such a shape is applied to the gas generator 1 according to Example 1 shown in FIG. Note that the cushion member 31 when applied to the gas generator 1 according to the second embodiment shown in FIG. Moreover, when applied to the gas generator 1 according to the third embodiment shown in FIG.

The cushion member 31 according to the present embodiment is made of a material that undergoes elastic deformation or plastic deformation, similarly to the cushion member 31 in the first to third embodiments. At least part of the portion 31a is sandwiched between the housing 4 or the like and the one end portion of the filter 32, and the inner region 31b comes into contact with the gas generating agent filled in the combustion chamber.

FIG. 5(b) is a cross-sectional view of the cushion member 31 shown in FIG. 5(a) taken along line A-A'. In the cushion member 31 according to this embodiment, the outer peripheral portion 31a is thinner than the inner region 31b. The cushion member generally has a uniform thickness. However, in the cushion member, the thickness of the portion in contact with the gas generating agent is different from the thickness necessary for suppressing the short pass by being sandwiched between the housing and the like and the filter. Therefore, in the cushion member 31 according to this embodiment, the thickness of the inner region 31b that contacts the gas generating agent and the thickness of the outer peripheral portion 31a that is sandwiched between the housing or the like and the filter to suppress the short pass are formed to be different. It is According to the cushion member 31 of this embodiment, for example, when the filling amount of the gas generating agent is changed, the thickness of the inner region 31b can be changed while keeping the thickness of the outer peripheral portion 31a constant. can be done. As a result, according to the cushion member 31 of this embodiment, even when the filling amount of the gas generating agent is changed, it is possible to retain the gas generating agent by changing the thickness of the inner region 31b. can be applied to the gas generating agent.

Further, in the cushion member 31 according to the present embodiment, the thickness of the inner region 31b does not have to be changed according to the filling amount of the gas generating agent. In the cushion member 31 according to this embodiment, the amount of elastic deformation and the amount of plastic deformation of the inner region 31b change according to the filling amount of the gas generating agent. It can be applied to the gas generating agent.

In addition, the cushion member 31 according to the present embodiment can suppress the short pass while facilitating the assembly of the gas generator.

<Example 5>
Next, a gas generator 101 according to Example 5 will be described with reference to FIG. FIG. 6 is a cross-sectional view in the height direction of the gas generator 101 according to this embodiment. The gas generator 101 shown in FIG. 6 accommodates only one combustion chamber 121 and one igniter 123 in a housing 104 formed by welding and fixing flange portions each having an upper shell 102 and a lower shell 103. It is configured as a single type gas generator.

The upper shell 102 has a large-diameter peripheral wall portion 102c, a small-diameter peripheral wall portion 102d, and a top surface portion 102e, which form a concave internal space. The top surface portion 102e, together with the bottom surface portion 103c of the lower shell 103, which will be described later, has a substantially circular shape when viewed from above. The large-diameter peripheral wall portion 102c and the small-diameter peripheral wall portion 102d form an annular wall surface that surrounds the top surface portion 102e and extends substantially perpendicularly from the top surface portion 102e. One end side (upper side in FIG. 6) of the small-diameter peripheral wall portion 102d is connected to the top surface portion 102e, and the other end side (lower side in FIG. 6) is connected to the large-diameter peripheral wall portion 102c expanded from the small-diameter peripheral wall portion 102d. . The other end side (lower side in FIG. 6) of the large-diameter peripheral wall portion 102c serves as an opening portion of the upper shell 102. As shown in FIG.

The lower shell 103 has a large-diameter peripheral wall portion 103a, a small-diameter peripheral wall portion 103b, and a bottom surface portion 103c, which form a concave internal space. The large-diameter peripheral wall portion 103a and the small-diameter peripheral wall portion 103b form an annular wall surface that surrounds the bottom surface portion 103c and extends substantially vertically from the bottom surface portion 103c. One end side (upper side in FIG. 6) of the large-diameter peripheral wall portion 103a serves as an opening of the lower shell 3, and the other end side (lower side in FIG. 6) is a small-diameter peripheral wall portion 103b whose diameter is smaller than that of the large-diameter peripheral wall portion 103a. is connected. A bottom surface portion 103c is connected to the other end side (lower side in FIG. 6) of the small-diameter peripheral wall portion 103b. Here, the inner diameter of the large-diameter peripheral wall portion 103a of the lower shell 103 is approximately the same as the inner diameter of the large-diameter peripheral wall portion 102c of the upper shell 102, and the inner diameter of the small-diameter peripheral wall portion 103b of the lower shell 103 is the same as that of the small-diameter peripheral wall portion of the upper shell 102. It is approximately the same as the inner diameter of 102d.

An igniter 123 is arranged in the central portion of the internal space of the housing 104 . The gas generator 101 according to this embodiment includes an igniter 123 as an ignition device. The ignition device may be composed of only the igniter 123, or may be composed of the igniter 123 and transfer charge. The transfer charge used in the first embodiment can be used. The lower end of the igniter 123 is joined to the bottom surface 103c of the lower shell 103, and the upper end of the igniter 123 is in contact with the top surface 102e of the upper shell 102. As shown in FIG. Thereby, a combustion chamber 121 which is an annular space surrounding the igniter 123 is formed in the inner space of the housing 104 . The combustion chamber 121 is filled with a gas generating agent 122 . As the gas generating agent 122, one similar to the first gas generating agent 22 shown in FIG. 1 is used.

A cylindrical filter 132 is arranged to surround the first combustion chamber 21 . The filter 132 has a tubular shape with both ends opened, and includes the combustion chamber 121 therein. Also, the filter 132 is arranged between the gas outlet 50 and the combustion chamber 121 . A plurality of gas discharge ports 50 are provided in the large-diameter peripheral wall portion 102 c such that the filter 32 is positioned between them and the combustion chamber 121 .

As in the first embodiment, the filter 132 is formed by stacking flat-woven stainless steel wire meshes in the radial direction and compressing them in the radial and axial directions. , to collect its combustion residue. In order to prevent moisture from entering the housing 104 from the outside, the gas outlet 50 is blocked from the inside of the housing 104 with an aluminum tape 134 before the gas generator 101 is activated. The gas outlet may be formed in the large-diameter peripheral wall portion 103 a of the lower shell 103 .

A cushion member 131 is arranged in the combustion chamber 121 . The cushion member 131 is made of a material that deforms elastically or plastically, and applies a biasing force to the gas generating agent 122 filled in the combustion chamber 121 . The cushion member 131 is similar to the cushion members 31 and 35 shown in FIG. The gas generating agent 122 is filled in the combustion chamber 121 while being held down by the biasing force of the cushion member 131 against the filter 132, the bottom portion 103c and the like so as not to vibrate unnecessarily.

Next, the filter 132 and the cushion member 131 in the gas generator 101 according to this embodiment will be described in detail. The filter 132 has a cylindrical shape with openings formed at both ends on the upper end portion 132a side and the lower end portion 132b side, and includes the combustion chamber 121 therein. The filter 132 has openings of the same size at both ends, and has a cylindrical shape with both ends open. An opening on the upper end portion 132a side of the filter 132 faces the cushion member 131, and an opening on the lower end portion 132b side of the filter 132 faces the bottom portion 103c. The inside of the filter 132 faces the combustion chamber 121, and the outside of the filter 132 faces the gas discharge port 50, the large-diameter peripheral wall portions 102c and 103a, the small-diameter peripheral wall portions 102d and 103b, and the like. The outer periphery of the filter 132 on the side of the top surface portion 102e (upper side) is in contact with the small diameter peripheral wall portion 102d, and the outer periphery of the filter 132 on the side of the bottom surface portion 103c (lower side) is in contact with the small diameter peripheral wall portion 103b. Further, the upper end portion 132a of the filter 132 is in contact with the outer peripheral portion 131a of the cushion member 131, and the lower end portion 132b of the filter 132 is in contact with the bottom surface portion 103c.

The cushion member 131 is arranged on the side of the top surface portion 102e, and has a substantially circular shape when viewed from above, like the top surface portion 102e. The cushion member 131 is arranged over the entire surface of the top surface portion 102 e inside the combustion chamber 121 . The cushion member 131 has an outer peripheral portion 131a including a circular outer peripheral edge and an inner region 131b surrounded by the outer peripheral portion 131a. The outer peripheral portion 131a is sandwiched between the top surface portion 102e and the upper end portion 132a of the filter 132 over its entire circumference. In this embodiment, the top surface portion 102e corresponds to the "first wall portion". The inner region 131b is in contact with the gas generating agent 122 through the opening of the filter 132 on the upper end portion 132a side.

In the gas generator 101 according to this embodiment, the outer peripheral portion 131a of the cushion member 131 is sandwiched between a portion of the housing 104 (top surface portion 102e) and one end portion of the filter 132 (upper end portion 132a). , the short pass of the combustion gas can be suppressed. A short pass of the combustion gas can occur due to a gap between the housing 104 and the filter 132, but the gas generator 101 prevents the gap from being created by the outer peripheral portion 131a of the cushion member 131, thereby preventing the short path. Passes can be suppressed. Further, the gas generator 101 according to this embodiment can be configured to be easily assembled, as in the first embodiment.

As described above, the gas generator 101 according to the present embodiment can be configured to be easily assembled while suppressing short-path.

Further, in this embodiment, the cushion member 131 may be arranged on the bottom surface portion 103c side. In this case, the outer peripheral portion 131 a of the cushion member 131 is sandwiched between the bottom portion 103 c and the lower end portion 132 b of the filter 132 . Note that the bottom surface portion 103c serves as the "first wall portion".

Further, in this embodiment, the outer peripheral portion 131a of the cushion member 131 has an outer portion including a circumference of the outer peripheral edge and an inner portion covering a circumference of the inner side of the outer portion. It may be sandwiched between the outside and the inner portion sandwiched between the top surface portion 102e and the upper end portion 132a of the filter 132 . In addition, the cushion member 131 is arranged on the bottom surface portion 103c side, the outer portion of the outer peripheral portion 131a is sandwiched between the small-diameter peripheral wall portion 103b and the outside of the filter 132, and the inner portion of the outer peripheral portion 131a is sandwiched between the bottom portion 103c and the bottom portion 103c. It may be held between the lower end portion 132b of the filter 132 and the lower end portion 132b.

In the above embodiment, the cylindrical filter has openings at both ends, but it is sufficient that at least one of the two ends has an opening. It is sufficient that the cushion member is arranged so as to face the opening at the end of the filter. The cushion member contacts the gas generating agent through openings at the ends of the filter. Further, for example, in the first embodiment shown in FIGS. 1 and 2 and the third embodiment shown in FIG. may correspond to the shapes of the end portion 12 of the dividing wall 10, the peripheral wall portion 13, the containing wall member 16, and the through hole 11 to form the opening. Further, in the second embodiment shown in FIG. 3, the opening may be formed on the entire surface of the end portion on the lower end portion 32b side without forming the opening on the end portion on the upper end portion 32a side of the filter 32 . In the fifth embodiment shown in FIG. 6, an opening is formed in the entire end portion of the filter 132 on the side of the upper end portion 132a, and an opening is formed in the end portion on the side of the lower end portion 32b so as to correspond to the shape of the igniter 123. You may

Note that the gas generators according to the above embodiments and modifications have a disc shape whose length in the axial direction (height direction) is shorter than the outer diameter when viewed from above. The present invention may be applied to a gas generator having a cylindrical shape whose length is longer than the outer diameter when viewed from above.

Reference Signs List 1, 101: gas generator 2, 102: upper shell 3, 103: lower shell 4, 104: housing 5, 50: gas outlet 10: dividing wall 14: dividing wall portion 16: containing wall member 21: first combustion Chamber 22: First gas generating agent 23: First igniter 25: Second combustion chamber 26: Second gas generating agent 27: Second igniters 31, 35: Cushion members 32, 132: Filter

Claims (3)

an igniter disposed within the housing;
a cylindrical filter including a combustion chamber in which an opening is formed in at least one end of both ends and which is filled with a gas generating agent to be combusted by the ignition device;
a gas discharge port provided in the housing such that the filter is positioned between the combustion chamber and the housing, the gas outlet communicating between the inside and the outside of the housing;
a cushion member made of an elastically deformable or plastically deformable material and applying a biasing force to the gas generating agent filled in the combustion chamber;
with
At least part of the outer peripheral portion of the cushion member is sandwiched between the first wall portion forming the combustion chamber and the one end portion of the filter over the entire circumference, and the cushion member is surrounded by the outer peripheral portion. is arranged in contact with the gas generating agent filled in the combustion chamber through the opening,
The outer peripheral portion of the cushion member has an outer portion that includes a circumference of the outer peripheral edge of the cushion member and an inner portion that covers an inner circumference of the outer portion,
the outer portion is sandwiched between a portion of the housing different from the first wall and the outside of the filter;
the inner portion is sandwiched between the first wall and the one end of the filter;
gas generator. further comprising a dividing wall that vertically divides the space within the housing,
The filter is arranged in any one of the spaces within the housing divided by the dividing wall,
At least a portion of the outer peripheral portion of the cushion member is sandwiched between the first wall portion, which is a part of the housing, and the one end portion of the filter over its entire circumference, or the dividing wall is sandwiched over its entire circumference. sandwiched between the first wall and the one end of the filter, which is part of
The gas generator according to claim 1. The outer peripheral portion is thinner than the inner region,
The gas generator according to claim 1 or 2.

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