Gas generator

Abstract

A gas generator (1, 100) comprising a housing (4) with a base surface (3b), an igniter (27, 123), a combustion chamber (25, 121), a confinement part (35, 14, 131, 102d), and a separating part (271, 281) comprising a pressure-receiving surface (271b, 281a) which receives a combustion product generated by combustion of the explosive (272) in the igniter (27, 123), the separating part (271, 281) being configured to be movable in a predetermined direction (C1) by action of the combustion product on the pressure-receiving surface (271b, 281a); The housing (4) accommodates the igniter (27) and includes the combustion chamber (25, 121) inside it. the detonator (27, 123) includes a receiving chamber (275) which receives an explosive (272) therein, and an ignition section (276) provided in the receiving chamber (275), and ignites the explosive (272), and The combustion chamber (25, 121) is configured to burn a gas-generating agent (26, 122) which is filled outside the receiving chamber (275), by the combustion of the explosive agent (272) in the detonator (27, 123), the combustion chamber (25, 121) is formed around the detonator (27, 123), and The restricting part (35, 14, 131, 102d) is positioned in a predetermined location in the predetermined direction (C1) of the detonator (27, 123), which is positioned within the combustion chamber (25, 121). The restricting part (35, 14, 131, 102d) restricts movement of the separating part (271, 281) in the predetermined direction (C1). The detonator (27, 123) includes the separating part (271, 281), which is integrated with the detonator (27, 123) before the combustion of the explosive (272) and separates from the detonator (27, 123) after the combustion of the explosive (272). The separating part (271, 281) further includes a guide that directs the combustion product, which is received by the pressure receiving surface (271b, 281a) is directed towards the igniter (27, 123), the combustion product being delivered directly to the combustion chamber (25, 121) near the bottom surface (3b) of the housing (4) by the guiding function of the separating part (271, 281), in a state,in which the movement of the separating part (271, 281) in the specified direction (C1) is restricted by the limiting part (35, 14, 131, 102d).

Description

[0001] The present invention relates to a gas generator according to the preamble of independent claim 1. In particular, the invention relates to a gas generator configured to combust a gas-generating agent by explosive combustion at an igniter, thereby producing combustion gas. Such a gas generator is known from German patent application DE 202 19 899 U1.

[0002] A gas generator configured to combust a gasifying agent through explosive combustion at an igniter is widely used as a generator to supply a power source for the desired operation of the generated combustion gas. Such a gas generator can, for example, be used as a power source to deploy an airbag in an airbag system mounted on a car or similar vehicle. In such a gas generator, the gasifying agent must be combusted as required to produce the intended combustion gas.

[0003] For example, in the gas generator shown in patent document 1, as in Fig. 14 and Fig. Figure 19 shows a detonator tip covered with a detonator cap and a detonator burning in a space covered by the detonator cap.

[0004] Furthermore, an ignition hole, configured to eject a flame due to explosive combustion, is formed in the ignition cover. This ignition hole is designed to eject a flame to an area around the axial center of a cylindrical housing of the gas generator. According to this configuration, the flame, due to explosive combustion, is released to the igniter, thereby initiating combustion of the gas-generating medium positioned around the axial center within the housing of the gas generator. [Citation list][Patent document] [Patent Document 1] JP 2000-296756 A [Patent Document 2] JP 3 044 097 U

[0005] In order for the gas-generating agent to combust as desired, the discharge direction of the combustion product generated by the explosion must be a desired direction. Furthermore, in the prior art gas generator, the combustion product is intended to be discharged laterally from the igniter in a radial pattern, away from the explosion receiving chamber. With regard to the arrangement of the gas-generating agent around the igniter in the combustion chamber, the gas-generating agent can be positioned not only laterally to the explosion receiving chamber but also below it. Furthermore, in the prior art, where the combustion product generated by the explosion is released laterally from the explosion receiving chamber, it is not easy for the combustion product to directly reach an area below the chamber.Therefore, in the current state of the art, there is a risk that the gas-generating medium positioned around the igniter cannot be burned as desired.

[0006] The object of the present invention is to provide a gas generator of the type mentioned above, which makes it possible to combust a gas-generating agent positioned around an igniter. This object is achieved according to the invention by a gas generator having the features of independent claim 1. Preferred embodiments are set forth in the dependent claims.

[0007] This includes an igniter within a gas generator, comprising a separating element configured to be detached from the igniter and movable in a predetermined direction by the action of a combustion product generated by explosive combustion at the igniter. Furthermore, according to the present invention, the gas generator is configured such that, in a state where movement of the separating element in the predetermined direction is restricted by a limiting element, a guide provided on the separating element directs a combustion product received by the separating element to the igniter. According to such a configuration, it is possible to suitably combust a gas-generating agent positioned around an igniter.

[0008] In particular, the gas generator includes an igniter, a combustion chamber, and a confinement section containing the igniter; a receiving chamber that receives an explosive; an ignition section provided in the receiving chamber that ignites the explosive; and a separating section that includes a pressure-absorbing surface that receives a combustion product generated by the combustion of the explosive at the igniter. The separating section is configured to be detachable from the igniter and movable in a predetermined direction by action of the combustion product on the pressure-absorbing surface. The combustion chamber is configured to burn a gas-generating agent that is filled outside the receiving chamber, by combustion of the explosive as the igniter. The combustion chamber is formed around the igniter. The confinement section is in a predetermined position in a predetermined direction relative to the igniter.The separating element, positioned within the combustion chamber, is designed to restrict movement of the separating element in the specified direction. Furthermore, the separating element includes a guide that directs the combustion product, captured by the pressure-bearing surface, towards the igniter, in a state where movement of the separating element in the specified direction is restricted by the separating element.

[0009] The detonator described above includes a separating element that is integrated with the detonator before the combustion of the explosive and separates from it after combustion. In the gas generator according to the present invention, which is provided with such a detonator, the combustion product generated by the combustion of the explosive acts on the pressure-bearing surface of the separating element. When this occurs, the separating element is separated from the detonator. The separating element is configured to be movable in a predetermined direction by the action of the combustion product on the pressure-bearing surface. Accordingly, the separating element, detached from the detonator, moves in the predetermined direction within the combustion chamber, which is designed to surround the detonator.Furthermore, the restrictor is positioned at a predetermined location and in a predetermined direction within the combustion chamber relative to the igniter. Accordingly, the separating element, which moves within the combustion chamber relative to the igniter in the predetermined direction, comes into contact with the restrictor during its movement, and this movement is restricted.

[0010] Furthermore, in a state where the movement of the separating element in the specified direction is restricted by the confining element, the combustion product reflected from the separating element by the pressure-bearing surface is directed by the guide from the separating element to the igniter and spreads within the combustion chamber. This combustion product then combusts the gas-generating agent on the igniter side. That is, combustion of the gas-generating agent positioned around the igniter is supported. As a result, the gas-generating agent positioned around the igniter can be combusted appropriately, so that inconsistencies in the combustion of the gas-generating agent can be suppressed as much as possible, and suitable combustion gas generation capability can be demonstrated.

[0011] Furthermore, in the gas generator according to the present invention, the igniter can further comprise a head fixed to it with the ignition section, and a receiving cup having a base surface positioned facing the ignition section and a circumferential wall connected to a circumferential edge of the base surface and positioned around the ignition section. The receiving cup forms the receiving chamber through the circumferential wall and the base surface. Furthermore, in the gas generator, the separating part can serve as the receiving cup, an inner wall surface of the receiving cup serves as the pressure-bearing surface, and the circumferential wall can act as a guide, directing the combustion product towards the head.In such a configuration, the inner wall surface of the receiving cup, which forms the receiving chamber, functions as the pressure-bearing surface, thus allowing the combustion product generated by the combustion of the explosive to act effectively upon it. This facilitates the separation of the receiving cup from the detonator. Furthermore, when movement of the receiving cup in the specified direction is restricted by the limiting element, the circumferential wall of the receiving cup, acting as a guide, directs the combustion product received from the pressure-bearing surface toward the detonator head, thereby ensuring the combustion of the gas-generating material positioned around the detonator.

[0012] In the gas generator described above, the receiving cup can be fixed to the head before the explosive is combusted at the detonator, allowing it to be detached from the head by the combustion of the explosive at the detonator. Furthermore, the gas generator can be configured such that, in a state where movement of the receiving cup in the predetermined direction is restricted by the confining element due to the combustion of the explosive at the detonator, an opening defined on a circumferential edge of the receiving cup at the head expands in diameter, and the circumferential wall containing the expanded opening directs the combustion product towards the head.

[0013] According to such a configuration, when the combustion product generated by the combustion of an explosive acts on the pressure-bearing surface of the receiving cup, the fixed state of the receiving cup and the head is no longer maintained. As a result, the receiving cup separates from the head and moves within the combustion chamber in the predetermined direction from the detonator. Subsequently, during this movement, the receiving cup comes into contact with the restraint element, and its movement is restricted. In this state, where the gas generator, as described above, is in a condition where the movement of the receiving cup is restricted from the head, a state is formed in which the opening of the receiving cup is enlarged in diameter.In such a state, the combustion product reflected from the receiving cup by the pressure-bearing surface is simply directed by the circumferential wall of the receiving cup over a wide area towards the head of the combustion chamber. As a result, the combustion product released from the receiving cup is guided over a wide area towards the head of the combustion chamber, thereby assisting the combustion of the gas-generating agent positioned around the igniter, also over a wide area. That is to say, it is possible to appropriately combust a gas-generating agent positioned around an igniter.

[0014] Furthermore, in the gas generator, as described above, the receiving cup can contain, in its circumferential wall, a first fragile part that deforms under the action of the combustion product, thus causing the opening of the receiving cup to widen in diameter. According to this configuration, the circumferential wall containing the first fragile part deforms in a direction that widens the opening of the receiving cup. This facilitates the flow of the combustion product over a wide area towards the head of the combustion chamber. As a result, the combustion of the gas-generating material positioned around the igniter is supported over a wide area, making it possible to combust the gas-generating material positioned around the igniter effectively.

[0015] Furthermore, in the gas generator as described above, the receiving cup can contain, in its circumferential wall, a second fragile part that is caused to break due to the action of the combustion product, thereby making a section of the receiving cup detachable from the head. The gas generator can also be configured such that, upon breaking of this second fragile part, the circumferential wall, at a section of the receiving cup separate from the head, directs the combustion product towards the head. According to such a configuration, when the combustion product generated by the combustion of the explosive acts upon the pressure-bearing surface of the receiving cup, the second fragile part contained in the circumferential wall breaks. When this occurs, a section of the receiving cup is separated from the head while the combustion product acts upon it.The section of the receiving cup, separate from the head end, then moves within the combustion chamber in the predetermined direction from the igniter, and this movement is restricted by the limiting element. The circumferential wall of this section of the receiving cup directs the combustion product towards the head, thus enabling the gas-generating agent positioned around the igniter to combust properly.

[0016] In the gas generator described above, the receiving cup can be either fixed to the head or anchored to the head on one side of an opening defined by a circumferential edge of the receiving cup on the head side of the circumferential wall, further forming the second fragile part in the circumferential wall near the bottom surface. Alternatively, the gas generator can be configured such that a section of the circumferential wall and the bottom surface integrally separate from the head side when the second fragile part breaks due to the combustion of the explosive at the detonator. Such a gas generator can be configured, for example, by welding any section of the circumferential wall of the receiving cup, from which the second fragile part is attached to the opening on the head.According to this configuration, when the second fragile part, contained within the circumferential wall, breaks due to the action of the combustion product, a section of the receiving cup, comprising the base and the circumferential wall near the base, is separated from the head. On the other hand, the other section of the receiving cup, comprising the opening and the circumferential wall near the opening, remains anchored to the head. Subsequently, the section of the receiving cup, separated from the head, moves within the combustion chamber in the predetermined direction from the igniter, and this movement is restricted by the limiting element. The circumferential wall of this section of the receiving cup directs the combustion product towards the head, thus enabling the gas-generating agent positioned around the igniter to combust effectively.

[0017] Furthermore, in the gas generator according to the present invention, the igniter can further include a head with the ignition section fixed thereto, and a receiving cup having a base surface positioned facing the ignition section and a circumferential wall connected to a circumferential edge of the base surface and positioned around the ignition section. The receiving cup forms the receiving chamber by means of the circumferential wall and the base surface. In such a configuration, the receiving cup can discharge the combustion product outwards from the receiving chamber by rupturing a predetermined area, and the separating part can serve as an additional cup which provides the pressure-absorbing surface that receives the combustion product discharged from the receiving cup and which is designed to cover the predetermined area of ​​the receiving cup.Furthermore, the gas generator can be configured such that, in a state where movement of the auxiliary cup is restricted in the specified direction away from the receiving cup by the combustion of the explosive at the detonator, a section of the auxiliary cup acts as a guide, directing the combustion product to the detonator.

[0018] According to this configuration, when a predetermined area of ​​the receiving cup ruptures due to the combustion of the explosive and the combustion product is released outwards from the combustion chamber, the combustion product acts on the pressure-absorbing surface of the auxiliary cup. When this occurs, the auxiliary cup separates in a predetermined direction, away from the receiving cup. Furthermore, in a state where the movement of the auxiliary cup in the predetermined direction is restricted by the confining element, the combustion product is directed towards the detonator through a section of the auxiliary cup and spreads across the combustion chamber. As a result, the combustion of the gas-generating element positioned around the detonator is assisted, thus enabling the gas-generating element positioned around the detonator to combust effectively.

[0019] The gas generator, as described above, may further include a housing that accommodates the igniter and the combustion chamber within it. In such a configuration, the housing may be further divided internally by a partition wall that vertically divides the combustion chamber, forming a first combustion chamber positioned at its upper side and a second combustion chamber positioned at its lower side. At the bottom of the housing, a first igniter for igniting a first gas-generating agent filled in the first combustion chamber and a second igniter for igniting a second gas-generating agent filled in the second combustion chamber may be provided.The divider wall can include a receiving wall that surrounds the first igniter, positioned on the bottom surface, and receives the first igniter within the first combustion chamber; the second igniter can include the separating part; the restricting part can serve as a section of the divider wall, positioned within the second combustion chamber, in the predetermined direction of the second igniter; and the guide of the separating part can direct the combustion product to the second igniter in a state in which the movement of the separating part in the predetermined direction is restricted by the section of the divider wall.

[0020] With such a gas generator, the way in which the combustion gas is released to the outside can be adjusted in various ways, according to the combustion of the first gas-generating agent by triggering the first igniter; and the combustion of the second gas-generating agent by triggering the second igniter. Furthermore, such a gas generator can also generate and release a relatively large quantity of combustion gas to the outside. Furthermore, with regard to the positional relationship between the igniters and the gas-generating agent in this gas generator, in the first combustion chamber, located at the top of the housing igniter, the first gas-generating agent tends to fill above the first igniter, which is positioned at the bottom of the housing.In contrast, in the second combustion chamber, which is positioned on the lower side of the housing igniter, the second gas-generating medium tends to be filled perpendicular to the second igniter, which is located in the base of the housing. In this case, a relatively large quantity of the second gas-generating medium is simply filled around the second igniter in the second combustion chamber, along the base of the housing. Here, in the gas generator as described above, in a state where the movement of the separator elements is restricted by a section of the separator wall, the combustion product reflected by the pressure-bearing surface of the separator is directed towards the second igniter (i.e., the base of the housing) by the guide of the separator element and distributed in the second combustion chamber.As a result, even if a relatively large quantity of the second gas-generating agent is present on the bottom surface of the casing around the second igniter, the second gas-generating agent can be combusted adequately. Thus, inconsistencies in the combustion of the gas-generating agent can be suppressed as far as possible, and suitable combustion gas generation capability can be demonstrated. [Advantageous effects of the invention]

[0021] According to the present invention, it is possible to suitably burn a gas-generating means that is positioned around an igniter. [Description of the drawings] [ Fig. 1] Fig. Figure 1 is a first schematic representation of a configuration of a gas generator according to an embodiment of the present invention. [ Fig. 2] Fig. Figure 2 is a schematic representation of a configuration of an igniter applied to the gas generator, shown in Fig. 1. [ Fig. 3] Fig. Figure 3 is a schematic representation of a configuration consisting of a receiving cup and a metal head applied to the detonator, as shown in Fig. 2. [ Fig. 4A] Fig. 4A is a schematic representation of a configuration of a second igniter and its surroundings in the gas generator, shown in Fig. 1, which represents a state prior to the combustion of an ignition charge. [ Fig. 4B] Fig. 4B is a schematic representation of a configuration of the igniter and its surroundings, in the gas generator, shown in Fig. 1, which represents a state after combustion by the ignition charge. [ Fig. 5] Fig. Figure 5 is a schematic representation of a configuration of a receiving cup according to a first modified example of Example 1 of the present invention. [ Fig. 6] Fig. Figure 6 is a second schematic representation of a configuration of a gas generator according to the embodiment of the present invention. [ Fig. 7] Fig. Figure 7 is a schematic representation of a configuration of a receiving cup according to Example 2 of the present invention. [ Fig. 8] Fig. Figure 8 is a schematic representation of a configuration of a second igniter and its surroundings in the gas generator according to Example 2 of the present invention, representing a state after the combustion of an ignition charge. [ Fig. 9] Fig. Figure 9 is a schematic representation of a configuration of an ignition applied to a gas generator according to Example 3 of the present invention. [ Fig. 10] Fig. Figure 10 is a schematic representation of a configuration of an additional cup applied to the detonator, shown in Fig. 9. [ Fig. 11A] Fig. 11A is a schematic representation of a configuration of a second igniter and its surroundings in the gas generator according to Example 3 of the present invention, representing a state prior to the combustion of an ignition charge. [ Fig. 11B] Fig. 11B is a schematic representation of a configuration of the second igniter and its surroundings in the gas generator according to Example 3 of the present invention, representing a state after the combustion of the ignition charge. [Description of exemplary implementations]

[0022] A gas generator according to an embodiment of the present invention is described below with reference to the drawings. It should be noted that the configurations of the following embodiment are provided as examples, and the present invention is not limited to the configurations of this embodiment. Example 1

[0023] Fig. Figure 1 is a cross-sectional view in a vertical direction of a gas generator 1. The gas generator 1 is configured to combust a gas-generating agent that fills a casing 4, formed from an upper hemisphere 2 and a lower hemisphere 3, and to release the combustion gas. It should be noted that the gas generator 1 is a so-called dual-type gas generator, comprising two combustion chambers, one positioned on the upper side and the other on the lower side. Each of the two combustion chambers contains an igniter and a gas-generating agent corresponding to each of the combustion chambers, as described below. Here, the upper hemisphere 2 comprises a circumferential wall 2c and a top surface 2b, which form an enclosed interior. The top surface 2d and a bottom surface 3b of the lower hemisphere 3, described below, are essentially circular when viewed from above.The perimeter wall 2c and a perimeter wall 3a of the lower half-shell 3, described below, each surround the top surface 2d and the bottom surface 3b, and extend substantially perpendicularly from the corresponding surfaces to form annular wall surfaces. The interior of the upper half-shell 2 is a first combustion chamber 21, filled with a first gas-generating agent 22, as described below. The top surface 2d is connected to one end of the perimeter wall 2c, and the other end of the perimeter wall 2c serves as an opening of the upper half-shell 2. Furthermore, at the other end of the perimeter wall 2c, a connecting wall 2a and a connecting section 2b are provided in that order from the opening.The radius of the interior formed by the fitting wall 2a is larger than the radius of the interior formed by the circumferential wall 2c on one side closer to the top surface 2d, and the fitting wall 2a is connected to the circumferential wall 2c, with the attachment section 2b placed in between.

[0024] Furthermore, the lower half-shell 3 includes the circumferential wall 3a and the base surface 3b, which form an enclosed interior space. The interior space is a second combustion chamber 25, filled with a second gas-generating agent 26, as described below. The base surface 2b is connected to one end of the circumferential wall 3a, and the other end of the circumferential wall 3a serves as an opening in the lower half-shell 3. The radius of the interior space formed by the circumferential wall 3a is essentially the same as the radius of the interior space formed by the circumferential wall 2c of the upper half-shell 2. The base surface 3b of the lower half-shell 3 is provided with holes in which a first igniter 23 and a second igniter 27 are fixed.

[0025] Furthermore, within the housing 4, a partition wall 10 is positioned between the upper half-shell 2 and the lower half-shell 3. The partition wall 10 comprises a terminal end 15, a partition wall 14 connected to the terminal end 15, which essentially divides the interior of the housing 4 into upper and lower compartments, a perimeter wall 13 connected to the partition wall 14 and extending along a receiving wall element (receiving wall) 16, described below, and an end 12 positioned to partially cover the opening of the receiving wall element 16. The end 12 forms a through-hole 11. The receiving wall element 16, which is tubular in shape, is located on the bottom surface 3b and surrounds the circumference of the first detonator 23, in its vertical direction, attached to the bottom surface 3b of the lower half-shell 3.An opening above the receiving wall element 16 is covered by the end 12 of the partition wall 10. Additionally, a through-hole 17 is provided in the receiving wall element 16, and the through-hole 17 allows communication between two chambers (the first combustion chamber 21 and the second combustion chamber 25) resulting from the division by the partition wall 10.

[0026] In a state where the partition wall 10 is attached to the lower half-shell 3 as described above, the upper half-shell 2 is also attached from above. As described above, since the radius of the interior formed by the fitting wall 2a of the upper half-shell 2 is larger than the radius of the interior formed by the circumferential wall 2c, the upper half-shell 2 fits snugly with the lower half-shell 3, and thus the system section 2b rests against the end 15 of the partition wall 10. It should be noted that in the housing 4, at one side of the fitting or contact between the upper half-shell 2 and the lower half-shell 3, the upper half-shell 2 and the lower half-shell 3 are joined by a joining method (for example, welding) suitable for preventing moisture, etc., from entering the housing 4 and containing the gas generating medium.

[0027] As described above, the interior of the housing 4 is essentially divided by the partition wall 10 into two compartments, one positioned at the top and one at the bottom. Within the interior of the housing 4, the first igniter 23 and the first gas-generating device 22 are positioned in the first combustion chamber 21, which is defined by the upper half-shell 2 and the partition wall 10, and the second igniter 27 and the second gas-generating device 26 are positioned in the second combustion chamber 25, which is defined by the lower half-shell 3 and the partition wall 10. Thus, the gas generator 1 is configured as a dual-type gas generator, incorporating two igniters: the first igniter 23 and the second igniter 27.It can be determined that both, the first detonator 23 and the second detonator 27, are fixed to the bottom surface 3b of the lower half-shell 3 and thus the first detonator 23 is received in a state in which the side of the first detonator 23 is surrounded by the receiving wall element 16.

[0028] In the first combustion chamber 21, while the first igniter 23 is housed in the space defined by the interior of the first receiving wall element 16 (the space defined by the receiving wall element 16 and the bottom surface 3b of the lower hemisphere 3, opening upwards), and the upper space is filled with the first gas-generating agent 22, a ring-shaped filter 23 is positioned to surround the first gas-generating agent 22. At this point, the first gas-generating agent 22 is pressed against the filter 23, the partition wall 14, and the like by a compressive force applied by a damping cushion 31, thus preventing unwanted vibrations from the gas-generating agent 22 in the first combustion chamber 21. The first gas-generating agent 22 is used as a gas-generating agent with a relatively low combustion temperature.It is preferred that the first gas-generating agent 22 has a combustion temperature in the range of 1000 to 1700 °C. The first gas-generating agent 22 can be a single-hole cylindrical gas-generating agent comprising, for example, guanidine nitrate (41 wt%), basic copper nitrate (49 wt%), and a binder or additive. It should be noted that the interior of the receiving wall element 16 can be filled with a gas-generating agent having a different composition than that of the first gas-generating agent 22. In this case, the composition of the gas-generating agent filled into the interior of the receiving wall element 16 can be configured with a combustion temperature higher than that of the first gas-generating agent 22 to facilitate ignition of the first gas-generating agent 22.

[0029] Filter 32 is configured with layers of flat, woven fabric made of stainless steel in the radial direction and compression of the fabric in both the radial and axial directions. Filter 32 is configured to cool the combustion gas from the first gas-generating device 22 and to collect combustion residues contained in the combustion gas. Alternatively, a filter with a wire-wound structure, in which a wire is wound to form multiple layers on a core rod, can be used as filter 32. It should be noted that filter 32 also collects the combustion residues from the second gas-generating device 26, which is filled in the second combustion chamber 25. Additionally, a gap 33, formed between the circumferential wall 2c of the upper half-shell 2 and the filter 32, creates a gas passage that surrounds the filter 32 and has a ring shape in the radial direction in cross-sectional view.The gap 33 allows the combustion gas to pass through the entire area of ​​the filter 32, thus enabling effective use of the filter 32 and effective cooling and purification of the combustion gas. The combustion gas flowing through the gap 33 reaches the gas outlet 5, which is provided in the perimeter wall 2c. Additionally, to prevent moisture from entering the housing from the outside, the gas outlet 5 is sealed from the inside of the housing 4 by an aluminum band 34 until the gas generator is activated.

[0030] Furthermore, the second combustion chamber 25 is filled with the second gas-generating medium 26, corresponding to the second igniter 27, which is fixed to the bottom surface 3b of the lower hemisphere 3. In this case, a relatively large quantity of the second gas-generating medium 26 is simply filled at the bottom surface 3b of the lower hemisphere 3, surrounding the second igniter 27 in the second combustion chamber 25. The second gas-generating medium 26 is also filled in such a way that it is pressed through a damping cushion 35, thus preventing unwanted vibrations of the second gas-generating medium 26 in the second combustion chamber 25. Furthermore, similar to the first gas-generating agent 22, a single-hole cylindrical gas-generating agent containing guanidine nitrate (41 wt.%), base copper nitrate (49 wt.%) and a binder or additive can also be used for the second gas-generating agent 26.

[0031] With such a configuration, in the gas generator 1, the form of the release of combustion gas to the outside can be adjusted in various ways by the combustion of the first gas-generating medium 22, caused by the activation of the first igniter 23; and combustion of the second gas-generating medium 26, caused by the activation of the second igniter 27. Furthermore, a relatively large quantity of combustion gas can be generated and released to the outside.

[0032] Next, an igniter, applied to gas generator 1, is based on Fig. 2 and Fig. 3, using the second detonator 27 as an example. The second detonator 27 is an electrical detonator. As in Fig. As shown in Figure 2, a space for receiving an ignition charge 272 is defined by a receiving cup 271, made of metal, the surface of which is covered by an insulating cover. Furthermore, a metal head 273 is positioned in the space, and a charge holder 274, which has a tubular shape, is provided on its upper surface. The ignition charge 272 is held by the charge holder 274. As shown in Fig. As shown in Figure 3, the receiving cup 271 comprises a base surface 271a, a circumferential wall 271b, and an opening 271c. Furthermore, the base surface 271a and the circumferential wall 271b of the receiving cup 271 cover an upper surface 273a and a circumferential surface 273b of the metal head 273, and the receiving cup 271 and the metal head 273 are fixed together, thereby forming a receiving chamber 275. The ignition charge 272 is sealed to this receiving chamber 275. A connecting cable 276, which electrically connects one of the connecting pins 278 and the metal head 273, is also routed to the base of the ignition charge 272, which is received in the receiving chamber 275. It can be observed that two conductor pins 278 are fixed to the metal head 273, with an insulator 277 positioned between them, and thus the two conductor pins 278 are in an insulated state during a non-voltage application.Furthermore, the opening 271c, defined by a circumferential edge of the receiving cup 271 on the metal head 273 side, is protected in a state in which the insulating properties between the lead pins 278 are suitably maintained by a resin collar 279. In the second igniter 27, which is configured such that when a voltage is applied between the two lead pins 278 by an external power supply, current flows to the bridge cable 276, which ignites the ignition charge 272. It should be noted that the bridge cable 276, which ignites the ignition charge 272, corresponds to the ignition section of the present invention.

[0033] Examples of the ignition charge used in the detonator, applied to the gas generator 1, include an explosive containing zirconium and potassium perchlorate (ZPP), an explosive containing titanium hydride and potassium perchlorate (THPP), an explosive containing titanium and potassium perchlorate (TiPP), an explosive containing aluminum and potassium perchlorate (APP), an explosive containing aluminum and bismuth oxide (ABO), an explosive containing aluminum and molybdenum oxide (AMO), an explosive containing aluminum and copper oxide (ACO), an explosive containing aluminum and iron oxide (AFO), or an explosive consisting of a combination of a plurality of the same explosives.These explosives exhibited characteristics such that, although they generated a high-temperature and high-pressure plasma during combustion immediately after ignition, when the combustion product condensed at room temperature, the explosives contained no gaseous components, and the generated pressure dropped abruptly. It should be noted that these explosives, unlike others, could be used as the ignition charge.

[0034] Then, when the ignition charge 272 burns, a combustion product is generated. When this occurs, the combustion product is ejected from the charge holder 274. At this point, the combustion product ejected from the upper end of the charge holder 274 tends to act mainly on the inner wall surface of the bottom surface 271a of the receiving cup 271, which is located facing the upper end of the charge holder 274.

[0035] Here, as in Fig. As shown in Figure 4A, a combustion chamber space (second combustion chamber 25) is located laterally from (area A1 in Fig. 4A), above (an area above area A1 in Fig. 4A), below (an area below area A1 in Fig. 4A), and outside the receiving chamber 275 provided by the second igniter 27, and the second gas-generating agent 26 is filled in the space. Provided that the combustion product from the receiving chamber 275 is released into the second combustion chamber 25 by rupturing a predetermined area of ​​the bottom surface 271a of the receiving cup 271, combustion of the second gas-generating agent 26, which is filled into the second combustion chamber 25 above, outside the receiving chamber 275, is readily supported. In this case, the combustion of the second gas-generating agent 26, which is filled into the second combustion chamber 25 laterally from below and outside the receiving chamber 275, is delayed, resulting in a risk of uneven combustion of the gas-generating agent.

[0036] In the gas generator 1 according to the present invention, the receiving chamber 271 separates from the second igniter 27 and moves in a predetermined direction by the action of the combustion product generated by the ignition charge 272. In a state where movement of the receiving chamber 271 is restricted by a damping pad 35 and the partition wall 14, the combustion product received by the receiving cup 271 is directed towards the second igniter 27 (i.e., towards the bottom surface 3b of the lower half-shell 3) through the circumferential wall 271b of the receiving cup 271. As a result, the combustion of the second gas-generating means 26 is laterally assisted from below and outside the receiving chamber 275. This is described in detail below.

[0037] As described above, the combustion product generated by the combustion of the ignition charge 272 is ejected from the upper end of the charge holder 274. This combustion product, ejected from the charge holder 274, acts on the inner wall surface of the receiving cup 271. As a result, the fixed state of the receiving cup 271 and the metal head 273 is no longer maintained, and the receiving cup 271 separates from the metal head 273. It should be noted that the receiving cup 271 is fixed to the metal head 273 before the combustion of the ignition charge 272 and is separated from the metal head 273 by the combustion of the ignition charge 272. Such a fixed state is achieved by not fixing the receiving cup 271 to the metal head 273 by welding. In this case, the receiving cup 271 is fixed to the metal head 273, for example, by potting it with a resin collar 279.Alternatively, the receiving cup 271 can be fixed to the metal head 273 by forming an indentation in the circumferential surface 273b of the metal head 273 and lightly crimping a section of the circumferential wall 271b of the receiving cup 271 corresponding to the indentation; or by injecting a resin around the receiving cup 271 and pressing the circumferential wall 271b of the receiving cup 271 against the circumferential surface 273b of the metal head 273, utilizing shrinkage during curing. It should be noted that in this case, a sealant can be applied to the circumferential wall 271b of the receiving cup 271 and the circumferential surface 273b of the metal head 273.

[0038] After the receiving cup 271 separates from the metal head 273 side, the combustion product generated by the combustion of the ignition charge 273 continues to act on the inner wall surface of the receiving cup 271. As a result, the receiving cup 271, separated from the metal head 273 side, moves in a predetermined direction from the second igniter 27 in the second combustion chamber 25. In this embodiment, the predetermined direction is perpendicular to the bottom surface 271a of the receiving cup 271. Furthermore, in the gas generator 1, the damping pad 35 and the partition wall 14 are positioned in the predetermined direction from the second igniter 27. Thus, the receiving cup 271, moving as described above, comes into contact with the damping pad 35 during this movement.The receiving cup 271 then proceeds in contact with the damper cushion 35, moving in the predetermined direction during deformation of the damper cushion 35, and is ultimately held in place by the partition wall 14, which contains the damper cushion 35. That is, the movement of the receiving cup 271 is restricted by the damper cushion 35 and the partition wall 14, and the damper cushion 35 and the partition wall 14 correspond to the restriction element in the present invention. It should be noted that, preferably, the second gas-generating means 26 is not located above the bottom surfaces 271a of the receiving cup 271 in the second combustion chamber 25 in the state before the receiving cup 271 has separated from the metal head 273, and thus the space for movement of the receiving cup 271, separate from the metal head 273 side, is adequately ensured.However, even in the case where the second gas-generating means 26 is present, a narrow opening is formed in the bottom surface 271a of the receiving cup 271, and the second gas-generating means 26, above the bottom surface 271a, is preferably burned when the second igniter 27 is activated, which makes it possible to ensure that the movement space of the receiving cup 271 is adequately separated from the metal head 273 side.

[0039] Here, the distribution of the combustion product in the second combustion chamber 25 is restricted in a state by which movement from the receiving cup 271, separate from the metal head 273 side, is based on Fig. 4B described. As in Fig. As shown in Figure 4B, the receiving cup 271 is held by the partition wall 14 with the damping cushion 35 interposed. Furthermore, in this state, a condition is formed in which the opening 271c of the receiving cup 271 is enlarged in diameter. This condition is formed by the receiving cup 271 being separated from the metal head 273 side, and by the metal forming the receiving cup 271 being elastically or plastically deformed. The distribution of the combustion product in the second combustion chamber 25 at this time is described in detail below.

[0040] As described above, the combustion product generated by the combustion of the ignition charge 272 is ejected from the upper end of the charge holder 274 (this is indicated by arrow C1 in Fig. 4B represents). This combustion product acts on the inner wall surface of the receiving cup 271, is reflected by the inner wall surface, and distributed into the second combustion chamber 25. Here, the stream of the combustion product reflected by the inner wall surface of the receiving cup 271 is guided through the circumferential wall 271b (this is represented by arrow C2 in Fig. 4B represents). As a result, as indicated by arrow C2 in Fig. As shown in figure 4B, the combustion product is directed towards the metal head 273 (second igniter 27). Furthermore, at this point, the opening 271c of the receiving cup 271 is enlarged in diameter, and thus the combustion product is guided over a wide area to the metal head 273 (second igniter 27). As a result, combustion can be supported over a wide area by the second gas-generating means 26, which is positioned around the second igniter 27. It can be noted that the upper end of the charge holder 274 is positioned in a space relatively high in the second combustion chamber 25, while a space near the bottom surfaces 3b of the lower hemisphere 3 in the second combustion chamber 25 is the lowest space in the second combustion chamber 25.Thus, assuming that the receiving cup 271 does not provide a guiding function as described above, the combustion product does not easily reach the space near the base 3b directly. On the other hand, in the present embodiment, the combustion product can be delivered directly to the space from the second combustion chamber 25 near the base 3b by the guiding function of the receiving cup 271, as described above, and thus ignition of the second gas-generating device 26 near the base 3b is readily achieved. It should be noted that, in the second igniter 27, the ignition charge 272 in the receiving chamber 275 can be sealed and is not held by the charge holder 274, and, in this case, the charge holder 274 need not be provided on the second igniter 27.

[0041] According to the gas generator according to the present invention, as described above, the gas-generating means positioned around the igniter can be suitably combusted so that inconsistency in the combustion of the gas-generating means can be suppressed as far as possible, and good combustion gas generation capability can be demonstrated. First modified example of Example 1

[0042] Next, a first modified example of Example 1, described above, will be presented, based on Fig. 5 described. It should be noted that in the present modified example, detailed descriptions of components, which are essentially the same as those of Example 1 described above, have been omitted. Fig. Figure 5 is a schematic representation of a configuration of the receiving cup 271 according to the present modified example.

[0043] As in Fig. As shown in Figure 5, the receiving cup 271, according to the present modified example, includes a thinned portion 271d in the circumferential wall 271b. The thinned portion 271d extends vertically from the circumferential wall 271b, is thinner compared to other areas of the circumferential wall 271b, and has a relatively fragile configuration. It can be noted that the thinned portion 271d corresponds to the first fragile part in the present invention. According to such a configuration, when the combustion product generated by the combustion of the ignition charge 272 acts on the inner wall surface of the receiving cup 271, the circumferential wall 271b ruptures along the thinned portion 271d. As a result, a condition is formed in which the opening 271c of the receiving cup 271 is slightly enlarged in diameter.This makes it easier to guide the combustion product over a wider area to the metal head 273 (second igniter 27). Second modified example of example 1

[0044] Next, a second modified example of Example 1, described above, will be presented, based on Fig. 6 described. It should be noted that in the present modified example, detailed descriptions of components that are essentially the same as those in Example 1 described above have been omitted. While the gas generator of Example 1 described above is a dual-type gas generator 1, as described in Fig. The gas generator to which the present invention is applied, as shown in Figure 1, is not limited to this type of gas generator. The present invention can, for example, also be applied to a single-type gas generator 100, as shown in Figure 1. Fig. 6 shown, applied.

[0045] In the gas generator 100, shown in Fig. 6, an igniter 123 is fixed to a base surface 103b of the lower half-shell 103 by an upper half-shell 102 and a lower half-shell 103, which form a housing 104. Subsequently, in a combustion chamber 121 formed around the igniter 123, a gas-generating agent 122 is combusted. The combustion gas from the gas-generating agent 122 passes through a filter 132, which is positioned around the gas-generating agent 122, and reaches a gas discharge port 105. It should be noted that, comparable to the gas generator 1 shown in Fig. 1. As described above, the gas outlet 105 is sealed from the inside of the housing 104 by an aluminum band 134. Furthermore, the igniter 123, applied to the gas generator 100, is as described in the explanations for Fig. 2 and Fig. 3 described above.

[0046] In such a gas generator 100, the separation process is similar to that in the gas generator 1, as shown in Fig. As described above, the receiving cup of the igniter 123 moves in the predetermined direction due to the action of the combustion product generated by the ignition charge. The movement of the receiving cup is then restricted by a damping pad 131 and a top surface 102d of the upper half-shell 102. In a state where the movement of the receiving cup is thus restricted, the combustion product received by the receiving cup is directed towards the igniter 123 through the circumferential wall of the receiving cup. As a result, the combustion of the gas-generating agent 122 is laterally supported from below and outside the receiving chamber of the igniter 123. It should be noted that the damping pad 131 and the top surface 102d of the upper half-shell 102 correspond to the restriction element of the present invention. Additionally, in the gas generator 100, comparable to the gas generator 1, shown in Fig. 1. As described above, for example, a narrow opening can be formed in the base of the receiving cup, and the gas-generating medium 122, which is located between the base of the receiving cup of the igniter 123 and the damper pad 131, can preferably be combusted using the combustion product ejected from the opening. As a result, the movement space of the receiving cup can be suitably ensured, separate from the metal head side. Example 2

[0047] Next, a second example of the present invention will be presented based on the Fig. 7 and Fig. 8 described. It should be noted that in the present example, detailed descriptions of components, which are essentially the same as those in Example 1 described above, have been omitted. Fig. Figure 7 is a schematic representation of a configuration of the receiving cup 271, according to the present example.

[0048] As in Fig. As shown in Figure 7, the receiving cup 271, according to the present example, includes a thinned section 271e on the circumferential wall 271b. The thinned section 271e extends circumferentially from the circumferential wall 271b, is thinner compared to other areas of the circumferential wall 271b, and has a relatively fragile configuration. It can be noted that the thinned section 271e corresponds to the second fragile part in the present invention. Here, according to the present embodiment, the receiving cup 271 is anchored to the metal head 273 on the side of the opening 271c of the circumferential wall 271b. The thinned section 271e is located closer to the bottom surface 271a in the circumferential wall 271b than the anchored section. It can be stated that the receiving cup 271 is anchored to the metal head 273, for example by welding the receiving cup 271 and the metal head 273 together.

[0049] When the combustion product, generated by combustion of the ignition charge 272 at the second detonator 27, which includes such a receiving cup 271, acts on the inner wall surface of the receiving cup 271, the thinned portion 271e, which is contained in the circumferential wall 271b, breaks off. When this occurs, a section of the circumferential wall 271b and the bottom surface 271a are integrally separated from the metal head 273 side. It should be noted that another section of the circumferential wall 271b, which is a section of the circumferential wall 271b at the opening 271c side, remains anchored to the metal head 273. Thereupon, the receiving cup, which is separated from the metal head 273 side as described above, moves in the predetermined direction from the second detonator 27 in the second combustion chamber 25, and, as in Fig. As shown in Figure 8, the receiving element is received by the partition wall 14, with the damping pad 35 positioned between them. Furthermore, in the receiving cup 271, received by the partition wall 14, a condition is formed in which the circumferential edge on the metal head 273 side is expanded in diameter. This condition, comparable to Example 1 described above, is formed by the metal of the receiving cup 271, separated from the metal head 273 side, being elastically or plastically deformed. At this point, the stream of combustion product reflected by the inner wall surface of the receiving cup 271, separated from the metal head 273 side, is guided through the circumferential wall portion 271b, which is fractured (this is indicated by arrow C2 in Figure 8). Fig. 8 represents). As a result, as indicated by arrow C2 in Fig. As indicated in figure 8, the combustion product is directed towards the metal head 273 (second igniter 27). The combustion product, thus directed, is then guided across a wide area towards the metal head 273 (second igniter 27). As a result, the combustion can be supported across a wide area by the second gas-generating agent 26, which is positioned around the second igniter 27. Example 3

[0050] Next, a third example of the present invention will be presented based on Fig. Sections 9 to 11B are described. It should be noted that in the present example, detailed descriptions of components that are essentially the same as those in Example 1 described above have been omitted. Fig. Figure 9 is a schematic representation of a configuration of the igniter, according to the present example. In the present example, the second igniter 27 is located in the gas generator 1, as shown in Figure 9. Fig. 1, as described above, as an example. In the second detonator 27, according to the present example, as in Fig. As shown in Figure 9, an additional cup 281 is provided, which covers the base surface 271a of the receiving cup 271. This additional cup 281 is a conical cup, as shown in Figure 9. Fig. 10 shown.

[0051] Subsequently, a second igniter 27 causes the combustion product to be discharged to the outside of the receiving chamber 275 by tearing open the predetermined area of ​​the base surface 271a of the receiving cup 271. In particular, as in Fig. As shown in Figure 11a, before combustion by the ignition charge 272, the base surface 271a of the receiving cup 271 is covered by the auxiliary cup 281. Thus, the specified area of ​​the base surface 271a (represented as an area corresponding to area A2 in Figure 11a) is covered by the receiving cup 271. Fig. 11A) is also covered by the additional cup 281. It can be stated that at this point, a predetermined space is formed by the base surface 271a of the receiving cup 271 and the additional cup 281, and the wall surface of the additional cup 281, which defines the predetermined space, is defined as an inner wall surface 281a of the additional cup. Subsequently, when the predetermined area is ruptured by the combustion of the ignition charge 272, as described above, the combustion product acts on the inner wall surface 281a of the additional cup. That is, the inner wall surface 281a of the additional cup corresponds to the pressure-bearing surface of the present invention. When this occurs, the receiving cup 281 separates from the receiving cup 271 and moves in the specified direction from the second igniter 27 in the second combustion chamber 25. The additional cup 281 is then restricted in its movement by the damping cushion 35 and the partition wall 14.It can be established that the auxiliary cup 281 is fixed to the receiving cup 271 in the state prior to combustion by the ignition charge 272, and can be separated from the receiving cup 271 by combustion by the ignition charge 272. Furthermore, the receiving cup 271 is anchored to the metal head 273 and thus cannot be separated from the metal head 273 by combustion of the ignition charge 272. Such anchoring is achieved, for example, by welding the receiving cup 271 and the metal head 273 together.

[0052] Then, when the additional cup 281 is received by the partition wall 14, with the damping cushion 35 placed between them, the flow of the combustion product is guided through the inner wall surface 281a of the additional cup, as shown by arrow C2' in Fig.11B is displayed. As a result, the combustion product is directed towards the metal head 273 (second igniter 27). Thus, the combustion can be supported by the second gas-generating agent 26, which is positioned around the second igniter 27.

[0053] According to such a gas generator, the gas-generating agent positioned around the igniter can be combusted in a suitable manner so that inconsistency in the combustion of the gas-generating agent can be suppressed as far as possible and a suitable gas-generating capability can be demonstrated. [List of reference symbols] 1,100 gas generator 2 Upper half-shell 3 Lower half-shell 3b Floor area 4 cases 5 Gas outlet connection 10 partition wall 14 Dividing wall 16 Mounting wall element 21 First combustion chamber 22 First gas production device 23 First detonator 25 Second combustion chamber 26 Second gas production means 27 Second detonator 31 damping cushions 32 filters 35 damping cushions 102d Top surface 121 Combustion chamber 123 detonators 131 damping cushions 271 Receipt cup 271a Floor area 271b Perimeter wall 271c Opening 271d Thinned section 271e Thinned section 272 Ignition charge 273 Metal head 274 load holders 275 Admission chamber 276 bridge cables 277 Insulator 278 Conductor pin 279 resin collars 281 Extra cup 281a Additional cup inner wall surface

Claims

[1] A gas generator (1, 100) comprising a housing (4) with a base surface (3b), an igniter (27, 123), a combustion chamber (25, 121), a confinement part (35, 14, 131, 102d), and a separating part (271, 281) comprising a pressure-receiving surface (271b, 281a) which receives a combustion product generated by combustion of the explosive (272) in the igniter (27, 123), the separating part (271, 281) being configured to be movable in a predetermined direction (C1) by action of the combustion product on the pressure-receiving surface (271b, 281a); The housing (4) accommodates the igniter (27) and includes the combustion chamber (25, 121) inside it. the detonator (27, 123) includes a receiving chamber (275) which receives an explosive (272) therein, and an ignition section (276) provided in the receiving chamber (275), and ignites the explosive (272), and The combustion chamber (25, 121) is configured to burn a gas-generating agent (26, 122) which is filled outside the receiving chamber (275), by the combustion of the explosive agent (272) in the detonator (27, 123), the combustion chamber (25, 121) is formed around the detonator (27, 123), and The restricting part (35, 14, 131, 102d) is positioned in a predetermined position in the predetermined direction (C1) by the igniter (27, 123) which is positioned inside the combustion chamber (25, 121); the restricting part (35, 14, 131, 102d) restricts movement of the separating part (271, 281) in the predetermined direction (C1). characterized by, that the detonator (27, 123) includes the separating element (271, 281) which is integrated with the detonator (27, 123) before the combustion of the explosive (272) and separates from the detonator (27, 123) after the combustion of the explosive (272), the separating element (271, 281) further includes a guide which directs the combustion product, received by the pressure-receiving surface (271b, 281a), to the detonator (27, 123), wherein the combustion product is delivered directly to the combustion chamber (25, 121) near the bottom surface (3b) of the housing (4) by the guide function of the separating element (271, 281), in a state in which the movement of the separating element (271, 281) in the predetermined direction (C1) by the restricting element (35, 14, 131, 102d) is limited. [2] The gas generator (1) according to claim 1, the igniter (27) characterized by : a head (273) which is fixed to the ignition section (276), and a receiving cup (271) which is provided with a bottom surface (271a) positioned facing the ignition section (276) and with a circumferential wall (271b) connected to a circumferential edge of the bottom surface (271a) and positioned around the ignition section (276), the receiving cup (271) forms the receiving chamber (275) by the circumferential wall (271b) and the bottom surface (271a), where: the separating part serves as the receiving cup (271), an inner wall surface of the receiving cup (271) serves as the pressure receiving surface, and the circumferential wall (271b), as the guide, directs the combustion product to the head (273). [3] The gas generator (1) according to claim 2, characterized by, that the receiving cup (271) is fixed to the head (273) prior to the combustion of the explosive (272) at the detonator (27), so that the latter is separable from the head side by the combustion of the explosive (272) at the detonator (27, 123); and in a state in which movement of the receiving cup (271), separated in the predetermined direction (C1), by the combustion of the explosive (272) at the detonator (27) is restricted by the restricting part (35, 14), an opening (271c), defined at a circumferential edge of the receiving cup (271) at the head side, expands in diameter, and the circumferential wall (271b), which includes the opening (271c) that is expanded in diameter, directs the combustion product towards the head (273). [4] The gas generator (1) according to claim 3, characterized by, that the receiving cup (271), in the circumferential wall (271b), includes a first fragile part (271d) which deforms through the action of the combustion product and thus causes the opening (271c) of the receiving cup (271) to widen in diameter. [5] The gas generator (1) according to claim 2, characterized by , that the receiving cup (271) includes, in the circumferential wall (271b), a second fragile part (271e) which causes to break due to the action of the combustion product, whereby a section of the receiving cup (271) is detachable from the head side; and the circumferential wall (271b) at a section of the receiving cup (271), separated from the head side by the breaking of the second fragile part (271e) by the combustion of the explosive (272) at the detonator (27), directs the combustion product to the head (273). [6] The gas generator (1, 100) according to claim 5, characterized by, that the receiving cup (271) is both fixed to the head (273) and anchored to the head (273) on one side of an opening (271c) defined by a circumferential edge of the receiving cup (271) on the head side of the circumferential wall (271b), and further forming the second fragile part (271e) in the circumferential wall (271b) near the bottom surfaces (271a); and a section of the circumferential wall (271b) and the bottom surface (271a) are integrally separated from the head side by the breaking of the second fragile part (271e) by the combustion of the explosive (272) at the detonator (27). [7] The gas generator (1) according to claim 1, characterized by , that the detonator (27) further comprises: a head (273) provided with the ignition section (276) fixed to it, and a receiving cup (271) which is provided with a bottom surface (271a) positioned facing the ignition section (276) and with a circumferential wall (271b) connected to a circumferential edge of the bottom surface (271a) and positioned around the ignition section (276), the receiving cup (271) forms the receiving chamber (275) by the circumferential wall (271b) and the bottom surface (271a), where: the receiving cup (271) releases the combustion product outwards from the receiving chamber (275) by tearing open a predetermined area, The separating part serves as an additional cup (281) which receives the pressure-absorbing surface (281a) that receives the combustion product discharged from the receiving cup (271), and which is designed to cover the specified area of ​​the receiving cup (271), and In a state in which movement of the auxiliary cup (281), separated in the specified direction (C1) away from the receiving cup (271) by the combustion of the explosive (272) at the detonator (27), is restricted by the limiting part (35, 14), a section of the auxiliary cup (281), as the guide, directs the combustion product to the detonator (27). [8] The gas generator (1) according to any one of claims 1 to 7, characterized by , that: the housing (4) further includes inside the same, a partition wall (10) which vertically divides the combustion chamber (25), and a first combustion chamber (21) positioned on an upper side of the same, and the combustion chamber (25), positioned on a lower side of the same, forms, and on the bottom surface (3b) of the housing (4), a first igniter (23) for burning a first gas-generating agent (22) filled in the first combustion chamber (21), and the igniter (27) for burning the gas-generating agent (26) filled in the combustion chamber (25); the partition wall (10) which includes a receiving wall (16) which surrounds the first igniter (23) positioned on the bottom surface (3b) and receives the first igniter (23) within the first combustion chamber (21); the confining part, which is a section (14) of the divider wall (10), positioned within the combustion chamber (25), in the predetermined direction (C1) from the igniter (27); and the guide of the separating part (271, 281), which directs the combustion product to the igniter (27, 123), in a state in which the movement of the separating part (271, 281) in the specified direction (C1) is restricted by the section (14) of the divider wall (10).

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