JP4989916B2 - Gas generator for personnel restraint system - Google Patents

Description

  The present invention relates to a gas generator for a person restraining device that can be used for the purpose of protecting passengers and pedestrians in automobiles.

  A pyro type gas generator that generates a combustion gas by burning a solid gas generating agent or a hybrid type gas generator that uses a pressurized gas together has a combustion chamber that contains the gas generating agent. When is cylindrical, the combustion chamber is also cylindrical.

Patent Document 1 is an invention related to an inflator using a pressurized gas. The inflator 10 shown in FIG. 3 has a structure in which a pressurized gas chamber housing 22 containing a pressurized medium and a gas generator housing 32 forming a combustion chamber containing a gas generating agent are arranged in the axial direction. The pressurized gas chamber housing 22 and the gas generator housing 32 are joined by welding or the like.
JP 2003-226222 A

  In the inflator 10 shown in FIG. 3 of Patent Document 1, a predetermined amount of the gas generating agent 39 is accommodated in the combustion chamber in the gas generator housing 32. When the capacity of the chamber is increased, there are a case where the axial length of the housing is increased and a case where the inner diameter is increased.

  When the igniter 34 is attached to one end portion of the gas generator housing 32, it is not preferable to lengthen the axial length of the gas generator housing 32 because the combustion completion time of the entire gas generating agent 39 is prolonged ( Since it burns from the gas generating agent 39 present in the vicinity of the igniter 34, it takes time to complete the combustion to the opposite end). Therefore, it is preferable to expand the inner diameter of the gas generator housing 32 to increase the flame contact area of the gas generating agent 39 in terms of rapid operation of the gas generator.

  In this way, when the inner diameter of the gas generator housing 32 is expanded, in order to prevent the igniter 34 from being detached by the internal pressure generated in the combustion chamber, the end portion is contracted in order to suppress the force applied to the igniter 34. It is preferable to make the diameter. However, if a corner is formed inside the housing when the diameter is reduced, cracks are likely to occur when pressure is applied.

  The present invention increases the gas generating agent, and even when the volume is increased by enlarging the inner diameter of the combustion chamber, the high pressure resistance of the combustion chamber can be maintained. It is an object to provide a generator.

[Claim 1]
As a means for solving the problems, the present invention
A gas generator for a person restraining device having a combustion chamber housing in which ignition means and a gas generating agent are accommodated,
The combustion chamber housing has a substantially cylindrical shape that is open at both ends, and has a first reduced diameter portion and a second reduced diameter portion that are reduced in inner diameter at both ends of the opening portion, and the inner diameter is expanded at a central portion in the axial direction. Has an enlarged diameter part,
A first annular surface between the first reduced diameter portion and the enlarged diameter portion; a second annular surface between the second reduced diameter portion and the enlarged diameter portion; There is provided a gas generator for a personnel restraint device, wherein a boundary surface between the first annular surface and a boundary surface between the enlarged diameter portion and the second annular surface are curved surfaces.

  In general, when increasing the volume of a combustion chamber filled with a gas generant, increasing the diameter of the combustion chamber housing increases the area of the end face, making it easier to apply force. It needs to be thick. Further, when the combustion chamber housing is lengthened in the axial direction, it takes more time for the gas generating agent started to burn from one end by the igniter to complete the combustion to the opposite end.

  However, in the present invention, since the inner diameter of the central portion of the housing is enlarged as compared with the both end portions, the volume of the combustion chamber housing can be increased and the above two problems can be solved simultaneously. Note that the reduced diameter portion and the enlarged diameter portion indicate the relationship between the relative inner diameter dimensions of the combustion chamber housing having the reduced diameter portion and the enlarged diameter portion. It can be manufactured by a diameter processing method, a method of expanding the center of a constant diameter cylindrical material, or a method of reducing the diameter of both ends of the constant diameter cylindrical material and expanding the center of the diameter.

  Further, when corners are formed on the boundary surface between the enlarged diameter portion and the first annular surface and the boundary surface between the enlarged diameter portion and the second annular surface on the inner surface of the combustion chamber housing, the pressure resistance of the corner portion is It is inferior to other flat surfaces. Therefore, when the gas generating agent in the combustion chamber housing burns and the internal pressure rises, cracks may occur in the corner portions and the pressure resistance may be reduced.

  However, in the present invention, the boundary surface between the enlarged-diameter portion and the first annular surface and the boundary surface between the enlarged-diameter portion and the second annular surface are curved surfaces (rounded), and no corners are formed. Therefore, a decrease in pressure resistance due to the occurrence of cracks as described above is prevented.

  In this invention, it is preferable that the curvature radius (r) in the said curved surface is the range of 1-10 mm, More preferably, it is the range of 1-5 mm.

  As the ignition means, a known electric igniter (using zirconium and potassium perchlorate as an ignition agent) widely used in gas generators for airbags can be used.

  In the gas generator according to the present invention, other members such as a pressurized gas chamber housing, a filter chamber, and a diffuser portion having a gas discharge port are formed in the gas generator type in the opening on the second reduced diameter portion side of the combustion chamber housing. Select and connect accordingly. The combustion chamber housing is substantially cylindrical, and the cross-sectional shape in the width direction can be circular, elliptical, polygonal, or the like.

  The gas generator of the present invention is a gas generator that operates vehicle personnel and pedestrian restraint devices such as airbag devices, and uses a combustion gas generated from a solid gas generating agent as an expansion medium for operating the device, The present invention can be applied to any combination of the combustion gas and pressurized gas (argon, helium, etc.).

[Claim 2]
According to the present invention, as another means for solving the problem, the ignition means is disposed in an opening on the side of the first reduced diameter portion in both end openings of the combustion chamber housing, and the second reduced diameter portion and The gas for personnel restraint device according to claim 1, further comprising a third reduced diameter portion having an inner diameter smaller than that of the first reduced diameter portion and the second reduced diameter portion between adjacent openings. Provide a generator.

  Combustion generated by activation of the igniter by providing a first reduced diameter portion and a third reduced diameter portion having a diameter smaller than that of the second reduced diameter portion between the second reduced diameter portion and the adjacent opening. Since the products (hot gas, flame, etc.) are likely to diffuse throughout the combustion chamber housing, the gas generating agent is easily ignited and combusted.

[Claim 3]
In another aspect of the present invention, the outer diameter of the combustion chamber housing has a dimension corresponding to at least the size relationship between the first reduced diameter portion and the enlarged diameter portion. A gas generator for a personnel restraint device according to 2, is provided.

  Such a combustion chamber housing can be obtained, for example, by pressing a tubular shape having substantially the same thickness from the outside to form the first reduced diameter portion. Furthermore, it is good also as an outer diameter dimension corresponding to a 2nd reduced diameter part. The thickness of the combustion chamber housing is preferably substantially uniform as a whole from the viewpoint of maintaining pressure resistance. Note that, from the viewpoint of the ease of mounting the gas generator in the vehicle, a gas generator having a substantially uniform outer diameter can be used regardless of the inner diameter.

[Claim 4]
The present invention provides other means for solving the problems,
One end opening of a cylindrical pressurized gas chamber housing filled with pressurized gas is connected to the second reduced diameter portion side of the combustion chamber housing, and gas exhaust is connected to the other end opening of the pressurized gas chamber housing. A diffuser part having an outlet is formed,
The space between the combustion chamber housing and the pressurized gas chamber housing is closed with a first rupturable plate, and the space between the pressurized gas chamber housing and the diffuser portion is closed with a second rupturable plate. A gas generator for a personnel restraint device according to any one of 3 is provided.

  Combustion gas generated from a solid gas generating agent and pressurized gas (argon, helium, etc.) are used in combination as an inflation medium for an airbag.

[Claim 5]
The present invention provides other means for solving the problems,
A diffuser portion having a gas discharge port is formed on the second reduced diameter portion side of the combustion chamber housing;
A filter is disposed in the diffuser section,
The gas generator for personnel restraint apparatus according to any one of claims 1 to 3, wherein a space between the combustion chamber housing and the diffuser portion is closed by a closing member.

  As the inflation medium of the airbag, only the combustion gas generated from the solid gas generating agent is used.

  Since the gas generator for the personnel restraint device of the present invention increases the gas generating agent, even if the volume is increased by enlarging the inner diameter of the combustion chamber, the high pressure resistance and operating performance of the combustion chamber are achieved. Can be maintained.

(1) Gas Generator in FIG. 1 FIG. 1 is an axial sectional view of a gas generator for a personnel restraint device. FIG. 2A is a partial view of FIG. 1, and FIG. 2B is a cross-sectional view of a portion corresponding to FIG. 2A in a conventional gas generator.

  The inflator 10 includes a pressurized gas chamber 20, a combustion chamber 30, and a diffuser portion 50, and is a gas generator suitable for an occupant protection airbag system from a side collision of a vehicle.

  The pressurized gas chamber 20 has an outer shell formed by a cylindrical pressurized gas chamber housing 22 and is filled with a pressurized gas made of an inert gas such as argon or helium, or a mixture thereof. Since the pressurized gas chamber housing 22 is symmetrical with respect to the axial direction and the radial direction, it is not necessary to adjust the orientation in the axial direction and the radial direction during assembly.

  A pressurized gas filling hole 24 is formed in a side surface of the pressurized gas chamber housing 22 and is closed by a pin 26 after being filled with the pressurized gas.

  The combustion chamber 30 includes ignition means (electric igniter) 37 and a gas generating agent 39 accommodated in a combustion chamber housing 32, and is connected to one end side of the pressurized gas chamber 20. The combustion chamber housing 32 and the pressurized gas chamber housing 22 are resistance welded at a joint 49. When the gas generator 10 is incorporated in an airbag system, the igniter 34 is connected to an external power source via a connector and a conductive wire.

  The gas generating agent 39 includes, for example, 34% by mass of nitroguanidine as a fuel, 56% by mass of strontium nitrate as an oxidizing agent, and 10% by mass of sodium carboxymethylcellulose as a binder (exhaust gas temperature 700 to 1630 ° C.). Can be used.

  The first communication hole 38 between the pressurized gas chamber 20 and the combustion chamber 30 is closed by the first rupturable plate 40, and the inside of the combustion chamber 30 is maintained at normal pressure. The first rupturable plate 40 is resistance-welded to the combustion chamber housing 32 at the peripheral edge portion 40a.

  A diffuser portion 50 having a gas discharge hole 52 for discharging the pressurized gas and the combustion gas is connected to the other end side of the pressurized gas chamber 20, and the diffuser portion 50 and the pressurized gas chamber housing 22 are connected to each other. Resistance welding is performed at 54.

  The diffuser part 50 has a cap shape having a plurality of gas discharge holes 52 through which gas passes. The diameter of the plurality of gas discharge holes 52 is preferably 0.5 to 2 mm, more preferably 0.5 to 1.2 mm.

  The second communication hole 56 between the pressurized gas chamber 20 and the diffuser portion 50 is closed by the second rupturable plate 58, and the inside of the diffuser portion 50 is maintained at normal pressure. The second rupturable plate 58 is resistance welded to the diffuser portion 50 at the peripheral edge portion 58a.

  The combustion chamber housing 32 has a first reduced diameter portion 33 on the igniter 37 side and a second reduced diameter portion 34 on the pressurized gas chamber housing 22 side. The first reduced diameter portion 33 and the second reduced diameter portion. An enlarged diameter portion 35 is provided between the portions 34. The inner diameter A of the first reduced diameter portion 33 and the inner diameter C of the second reduced diameter portion 34 are equal, and the inner diameter B of the enlarged diameter portion 35 has a relationship of B> A and B> C. The thickness of the combustion chamber housing 32 is substantially uniform.

  On the distal end side of the second reduced diameter portion 34, there is a third reduced diameter portion 36 to which the first rupturable plate 40 is attached. The inner diameter of the third reduced diameter portion 36 is smaller than the inner diameter of the second reduced diameter portion 34.

  A first annular surface 60 is provided between the first reduced diameter portion 33 and the enlarged diameter portion 35, and a second annular surface 61 is provided between the second reduced diameter portion 34 and the enlarged diameter portion 35. The boundary surface 60a between the enlarged diameter portion 35 and the first annular surface 60 and the boundary surface 61a [FIG. 2 (a)] between the enlarged diameter portion 35 and the second annular surface 61 are curved surfaces (r = 2 mm).

  Since the combustion chamber housing 32 has the enlarged diameter portion 35 at the axial center, the combustion volume is increased. Therefore, the distance between the igniter 37 and the first rupturable plate 40 can be shortened as compared with the case where the combustion volume is increased by increasing the axial length of the combustion chamber housing 32. Therefore, although the combustion volume is increased, the time required for the gas generating agent 39 in the vicinity of the igniter 37 to burn first and the combustion to reach the first rupturable plate 40 does not increase. Therefore, rapidity can be maintained from gas generation to gas generation.

  The combustion chamber housing 32 uses a tube member equal to the outer diameter of the diameter-expanded portion 35, and from the end side that forms the first diameter-reduced portion 33 and the second diameter-reduced portion 34 (or the third diameter-reduced portion 36). It can be formed with a reduced diameter by a press, and may be additionally processed by cutting as necessary or attaching another member by welding or the like.

  Next, the operation when the inflator 10 shown in FIG. 1 is incorporated in an airbag system mounted on an automobile will be described.

  When the automobile collides and receives an impact, the igniter 37 is activated and ignited by the operation signal output means to burn the gas generating agent 39 and generate high-temperature combustion gas. Thereafter, the first rupturable plate 40 is destroyed by the pressure increase in the combustion chamber 30 due to the high-temperature combustion gas. The gas enters the pressurized gas chamber 20 and increases the pressure in the pressurized gas chamber 20. As a result, the second rupturable plate 58 is broken, and the pressurized gas and the combustion gas are discharged from the gas discharge hole 52 through the second communication hole 56, and the airbag is inflated.

  In such an operation, when the gas generating agent 39 is combusted, the inside of the combustion chamber housing 32 becomes a high pressure. At this time, the boundary surface 60a between the enlarged diameter portion 35 and the first annular surface 60 and the boundary surface 61a between the enlarged diameter portion 35 and the second annular surface 61 have angles as shown in FIG. Then, there is a possibility that cracks may occur as shown in the figure due to the increase in internal pressure. However, in the gas generator 10 of FIG. 1, as shown in FIG. 2A, the boundary surface 60 a between the enlarged diameter portion 35 and the first annular surface 60 and the boundary surface between the enlarged diameter portion 35 and the second annular surface 61. Since 61a has a curved surface (r = 2 mm), it has a high pressure resistance and does not generate cracks or the like even when the internal pressure increases.

(2) Gas Generator in FIG. 3 FIG. 3 is an axial cross-sectional view of a gas generator for a personnel restraint device according to another embodiment.

  The gas generator 100 includes a combustion chamber 130 and a cup-shaped filter housing 150 connected to one end of a combustion chamber housing 132 having a long cylindrical shape that forms an outer shell of the combustion chamber 130.

  One end of the filter housing 150 is closed by the bottom 151, and the other end is open. A plurality of rows of gas discharge holes 152 are formed in the circumferential wall portion 154 of the filter housing 150 at equal intervals in the circumferential direction. A cylindrical filter 153 is accommodated in the filter housing 150, and a cylindrical space 155 is formed between the filter 153 and the peripheral wall portion 154.

  The combustion chamber housing 132 accommodates an electric igniter 137 and a gas generating agent 139 (the same as the gas generating agent 39 in FIG. 1), and the open end of the filter housing 150 is resistance welded at the joint 149. Has been. The communication hole 138 between the filter housing 150 and the combustion chamber housing 132 is closed by the seal member 140, and moisture is prevented from entering the combustion chamber 130.

  The combustion chamber housing 132 has a first reduced diameter portion 133 on the igniter 137 side, and a second reduced diameter portion 134 on the filter housing 150 side, and the first reduced diameter portion 133 and the second reduced diameter portion 134 An enlarged diameter portion 135 is provided therebetween. The inner diameter A of the first reduced diameter portion 133 and the inner diameter C of the second reduced diameter portion 134 are equal, and the inner diameter B of the enlarged diameter portion 135 has a relationship of B> A and B> C. The thickness of the combustion chamber housing 132 is substantially uniform.

  On the distal end side of the second reduced diameter portion 134, there is a third reduced diameter portion 136 to which a seal member 140 is attached. The third reduced diameter portion 136 is formed in a flange shape protruding inward, and the inner diameter of the hole formed thereby is smaller than the inner diameter of the second reduced diameter portion 134.

  A first annular surface 160 is provided between the first reduced diameter portion 133 and the enlarged diameter portion 135, and a second annular surface 161 is provided between the second reduced diameter portion 134 and the enlarged diameter portion 135. The boundary surface 160a between the enlarged diameter portion 135 and the first annular surface 160 and the boundary surface 161a between the enlarged diameter portion 135 and the second annular surface 161 are the same curved surface (r = 2 mm) as in FIG.

  Since the combustion chamber housing 132 has the enlarged diameter portion 135 at the axial center, the combustion volume is increased. Therefore, the distance between the igniter 137 and the seal member 140 can be shortened as compared with the case where the combustion volume is increased by increasing the axial length of the combustion chamber housing 132. Therefore, although the combustion volume is increased, the time required for the gas generating agent 139 near the igniter 137 to burn first and the combustion to reach the seal member 140 does not increase. Rapidity can be maintained until the occurrence of

  Next, an operation when the inflator 100 shown in FIG. 3 is incorporated in an airbag system mounted on an automobile will be described.

  When the automobile collides and receives an impact, the igniter 137 is activated and ignited by the operation signal output means to burn the gas generating agent 139 and generate a high-temperature combustion gas. Thereafter, the seal member 140 is destroyed by the pressure increase in the gas generator 130 due to the high-temperature combustion gas. After entering the filter housing 150, the gas is filtered and cooled by the filter 153, discharged from the gas discharge hole 152, and inflates the airbag.

  In such an operation, similarly to the gas generator 10 of FIG. 1, the boundary surface 160a between the enlarged diameter portion 135 and the first annular surface 160 and the boundary surface 161a between the enlarged diameter portion 135 and the second annular surface 161 are: Since the curved surface (r = 2 mm) is the same as that in FIG. 2A, the pressure resistance is high, and cracks and the like are not generated even when the internal pressure increases.

(3) Gas Generator in FIG. 4 FIG. 4 is a partial axial sectional view of an embodiment in which only the combustion chamber housing 132 is different from the gas generator 100 in FIG.

  The combustion chamber housing 232 contains an electric igniter 137 and a gas generating agent 139 (the same as the gas generating agent 39 in FIG. 1), and the open end of the filter housing 150 is resistance welded at the joint. ing. The filter housing 150 and the combustion chamber housing 232 are closed by a partition wall 205 having a communication hole 238 to which a seal member 240 is attached.

  The combustion chamber housing 232 includes a first reduced diameter portion 233 on the igniter 137 side, and a second reduced diameter portion 234 on the filter housing 150 side, and the first reduced diameter portion 233 and the second reduced diameter portion 234 An enlarged diameter portion 235 is provided therebetween. The inner diameter of the first reduced diameter portion 233 and the inner diameter of the second reduced diameter portion 234 are equal, and the inner diameter of the enlarged diameter portion 235 is larger than the inner diameter of the first reduced diameter portion 233 and the inner diameter of the second reduced diameter portion 234. The thickness of the combustion chamber housing 232 is substantially uniform.

  The boundary surface 260 between the first reduced diameter portion 233 and the enlarged diameter portion 235 and the boundary surface 261 between the enlarged diameter portion 235 and the second reduced diameter portion 234 are both curved surfaces similar to FIG. (R = 2 mm). The first reduced diameter portion 233 and the enlarged diameter portion 235, and the second reduced diameter portion 234 and the enlarged diameter portion 235 are connected by the first annular surface 201 and the second annular surface 202, respectively.

(4) Gas Generator in FIG. 5 FIG. 5 is an axial sectional view of an embodiment in which a part of the gas generator 10 in FIG. 1 is modified. This is the same as the gas generator 10 of FIG. 1 to 4 has an outer diameter corresponding to the inner diameter of the combustion chamber housing, the gas generator 300 of FIG. 5 has a combustion chamber housing. The difference is that the correspondence between the inner diameter and the outer diameter is not the same.

  The gas generator 300 includes a combustion chamber 330 and a pressurized gas chamber 20 connected to one end of a combustion chamber housing 332 that forms an outer shell of the combustion chamber 330. The combustion chamber housing 332 and the pressurized gas chamber housing 22 are resistance welded at a stepped portion 350 formed on the end surface of the combustion chamber housing 332.

  The first communication hole 338 between the pressurized gas chamber 20 and the combustion chamber 330 is closed by the first rupturable plate 340, and the inside of the combustion chamber 330 is maintained at normal pressure.

  The combustion chamber housing 332 includes a first reduced diameter portion 333 on the igniter 337 side and a second reduced diameter portion 334 on the pressurized gas chamber housing 22 side, and the first reduced diameter portion 333 and the second reduced diameter. An enlarged diameter portion 335 is provided between the portions 334. The inner diameter A of the first reduced diameter portion 333 and the inner diameter C of the second reduced diameter portion 334 have a relationship of A> C, and the inner diameter B of the enlarged diameter portion 335 has a relationship of B> A and B> C. ing.

  A first annular surface 360 is provided between the first reduced diameter portion 333 and the enlarged diameter portion 335, and a second annular surface 361 is provided between the second reduced diameter portion 334 and the enlarged diameter portion 335. A boundary surface 360a between the enlarged diameter portion 335 and the first annular surface 360 and a boundary surface 361a between the enlarged diameter portion 335 and the second annular surface 361 are curved surfaces (r = 2 mm) similar to those in FIG.

  As shown in FIG. 5, the angle (θ1) formed between the first annular surface 360 and the perpendicular from the inner surface of the enlarged diameter portion 335 and the angle formed between the second annular surface 361 and the perpendicular from the inner surface of the enlarged diameter portion 335. (Θ2) has a relationship of θ1> θ2, and the outer diameter dimensions corresponding to the enlarged diameter portion 335 and the second reduced diameter portion 334 are the same. For this reason, the maximum outer diameter of the combustion chamber housing 332 and the outer diameter of the pressurized gas chamber housing 22 are uniform.

  The combustion chamber housing 332 has an enlarged diameter portion 335 at the center in the axial direction, so that the combustion volume is increased. Therefore, the distance between the igniter 337 and the first rupturable plate 340 can be shortened as compared with the case where the combustion volume is increased by increasing the axial length of the combustion chamber housing 332. For this reason, although the combustion volume is increased, the time required for the gas generating agent near the igniter 337 to burn first and the combustion to proceed to the first rupturable plate 340 does not increase. Rapidity can be maintained until gas generation.

The axial sectional view of the gas generator for personnel restraint devices. The fragmentary sectional view of FIG. 1 and the partial sectional view of the prior art of the same site | part. The axial direction sectional view of the gas generator for personnel restraint devices of other embodiments. The axial direction fragmentary sectional view of the gas generator for personnel restraint devices of other embodiments. The axial direction sectional view of the gas generator for personnel restraint devices of other embodiments.

Explanation of symbols

10, 100, 200, 300 Gas generator 20 Pressurized gas chamber 22 Pressurized gas chamber housing 30 Combustion chamber 32 Combustion chamber housing 33 First reduced diameter portion 34 Second reduced diameter portion 35 Expanded diameter portion 50 Diffuser portion 60 First Annular surface 60a Curved surface 61 Second annular surface 61a Curved surface

Claims (4)

A gas generator (10) for a person restraining device having a combustion chamber housing (32) in which an ignition means (37) and a gas generating agent (39) are accommodated,
The combustion chamber housing (32) has a substantially cylindrical shape that is open at both ends, and has a first reduced diameter portion (33) and a second reduced diameter portion (34) whose inner diameter is reduced at both ends of the opening. It has an enlarged diameter part (35) whose inner diameter is expanded at the center of the direction,
A first annular surface (60a) is provided between the first reduced diameter portion (33) and the enlarged diameter portion (35), and the second reduced diameter portion (34) and the enlarged diameter portion (35) There is a second annular surface (61a) in between, the boundary surface between the enlarged diameter portion (35) and the first annular surface (60a), and the enlarged diameter portion (35) and the second annular surface (61a). boundary surface is curved surface der with is,
One end opening of a cylindrical pressurized gas chamber housing (22) filled with pressurized gas is connected to the second reduced diameter portion (34) side of the combustion chamber housing (32), and the pressurized gas chamber housing ( A diffuser portion (50) having a gas discharge port (52) is formed at the other end opening of 22),
The space between the combustion chamber housing (32) and the pressurized gas chamber housing (22) is closed by the first rupturable plate (40), and the space between the pressurized gas chamber housing (22) and the diffuser section (50) is second ruptured. A gas generator for personnel restraint , which is blocked by a plate (58) . A gas generator (100) for a person restraining device having a combustion chamber housing (132) in which an ignition means (137) and a gas generating agent (139) are accommodated,
The combustion chamber housing (132) has a substantially cylindrical shape that is open at both ends, and has a first reduced diameter portion (133) and a second reduced diameter portion (134) whose inner diameter is reduced at both ends of the opening. It has an expanded diameter part (135) whose inner diameter is expanded at the center of the direction,
A first annular surface (160a) is provided between the first reduced diameter portion (133) and the enlarged diameter portion (135), and the second reduced diameter portion (134) and the enlarged diameter portion (135) A second annular surface (161a) in between, a boundary surface between the enlarged diameter portion (135) and the first annular surface (160a), and the enlarged diameter portion (135) and the second annular surface (161a); The boundary surface is a curved surface,
A diffuser part (150) having a gas discharge port (152) is formed on the second reduced diameter part (134) side of the combustion chamber housing (132),
A filter (153) is arranged in the diffuser section (150),
A gas generator for a person restraining device in which a space between a combustion chamber housing (132) and a diffuser part (150) is closed by a closing member (140) . The ignition means is disposed in an opening on the first reduced diameter portion side in both end openings of the combustion chamber housing, and further between the second reduced diameter portion and an opening adjacent to the second reduced diameter portion. The gas generator for a personnel restraint device according to claim 1 or 2 , further comprising a first reduced diameter part and a third reduced diameter part having an inner diameter smaller than that of the second reduced diameter part. The personnel restraint device according to any one of claims 1 to 3, wherein an outer diameter of the combustion chamber housing has a size corresponding to at least a size relationship between the first reduced diameter portion and the enlarged diameter portion. Gas generator.

Images