EXHAUST DEVICE AND GAS GENERATOR

Abstract

An ejection device (100) for a gas generator, the ejection device (100) for ejecting a combustion product, comprising: a detonator (101) with an ignition charge and an ignition area (102) designed to burn the ignition charge; a pyrotechnic device (121) arranged to be burned by burning the ignition charge; a cup (104) made of metal, wherein the cup (104) has a base (107) and a peripheral wall (105), wherein the bottom surface (107) is arranged opposite the ignition area (102), the peripheral wall (105) adjoins a peripheral edge of the bottom surface (107) and is arranged to surround the ignition area (102), wherein the cup (104) further comprises a receiving space (120) which is defined by the peripheral wall (105) and the floor area (107) is formed and receives the pyrotechnic agent (121), wherein the bottom surface (107) of the cup (104) contains a through-hole (108) through which the receiving chamber (120) and an exterior area of ​​the cup (104) are connected, wherein the through-hole (108) is formed by several peripheral through-hole edges (108a, 108b, 108c, 108d), and the adjacent peripheral through-hole edges (108a, 108b, 108c, 108d) are connected to each other at a predetermined connection point, the through-bore (108) contains a narrow part (115) in which the width of the through-bore (108), formed by each of parts of the two peripheral through-bore edges (108a, 108b, 108c, 108d) of the several peripheral through-bore edges (108a, 108b, 108c, 108d), gradually decreases with increasing distance from a center of the bottom surface (107) to the peripheral edge of the bottom surface (107), and the narrow part (115) is closer to the peripheral edge of the bottom surface (107) than a non-narrow part (125) formed by each of the other parts of the two peripheral through-bore edges (108a, 108b, 108c, 108d), and the narrow part (115) is a predetermined part in which stress due to the emission of the combustion product is concentrated, and the bottom surface (107) is designed to be split starting from the narrow part (115), and the peripheral wall (105) is designed to be split.

Description

[Area]

[0001] The present invention relates to an ejection device for expelling a combustion product to the outside and further relates to a gas generator which includes the ejection device and generates combustion gas by burning a gas-generating agent. [Background]

[0002] Devices designed to burn a pyrotechnic agent, such as gunpowder, and a gas-generating agent or gas-generating device to expel a resulting combustion product are widely used to utilize the combustion product as a power source to achieve a desired function. Such an ejection device can, for example, be used as a power source to deploy an airbag for an airbag system installed in a vehicle or the like. In such a combustion product ejection device, the combustion product of a pyrotechnic agent generated inside the ejection device must be ejected precisely in a direction necessary for the intended operation.

[0003] DE 201 14 664 U1 discloses an ejection device comprising a detonator, a pyrotechnic agent, a cup with a peripheral wall and a base, wherein the cup has a receiving chamber for the pyrotechnic agent. A star-shaped through-hole is formed in the base.

[0004] For example, a technique described in patent specification 1 discloses an aspect in which a combustion product is ejected laterally from an ejection device. In particular, the ejection device comprises a housing as a cup according to claim 1, which covers an igniter configured to burn an ignition charge. Furthermore, several straight slit lines extending longitudinally along the ejection device are formed on the side of the housing at equal intervals around the circumference of the housing. The slit lines are thinner than other parts of the housing. Therefore, when the igniter in the housing is activated and a combustion product is generated, the internal pressure in the housing increases, causing the slit lines to widen in one direction of their extension, and as a result, the combustion product is ejected laterally from the ejection device through an opening formed by the slits. [List of citations][Patent specification]

[0005] [Patent 1] US 5,803,492 A [Overview][Technical Problem]

[0006] An ejection device in the prior art is intended to eject a combustion product radially and laterally from the device by means of grooves designed as thinned sections. If such fragile sections with lower strength are partially designed to expand under the pressure generated at the time of combustion of a pyrotechnic agent, then the fragile sections must be designed to have a strength that allows the desired gap formation. For example, if the intention is to eject a combustion product radially, as is the case in the prior art, all grooves designed as thinned sections must have the same thickness.If a variation in thickness occurs in the scribe lines, the thinnest scribe line splits first, and in some cases some scribe lines may not widen sufficiently, and as a result, the combustion product is not expelled in the desired direction.

[0007] In light of the problems described above, one object of the present invention is to provide an ejection device which can eject a combustion product of a pyrotechnic agent in a desired direction in a suitable manner laterally to the ejection device. [Solution to the problem]

[0008] To solve the preceding problem, an ejection device with the features of claim 1 or claim 2 is provided. In the present invention, a through-hole or bore form is provided on the upper surface of a component forming an outer shell of an ejection device, and a structure is provided in which the load or pressure on a predetermined part is concentrated at a peripheral edge of the through-hole due to the combustion of an ignition charge on the inside. With this structure of the outer shell component, it is possible to form a gap extending from the point where the load is concentrated to the side of the outer shell component, and to eject the combustion product laterally from the outer shell.

[0009] In particular, an ejection device according to one embodiment of the present invention is an ejection device for ejecting a combustion product, and the ejection device comprises an igniter with an ignition charge and an ignition region configured to burn the ignition charge, a pyrotechnic agent arranged to be burned by the combustion of the ignition charge, and a cup made of metal, the cup having a bottom surface and a peripheral wall. The bottom surface of the cup is arranged opposite the ignition region, and the peripheral wall of the cup is adjacent to a peripheral edge of the bottom surface and is arranged to surround the ignition region, and the cup further comprises a receiving space formed by the peripheral wall and the bottom surface, which receives the pyrotechnic agent.Furthermore, the base of the cup includes a through-hole through which the receiving chamber and an exterior area of ​​the cup are connected, the through-hole being bounded by several peripheral through-hole edges, and the adjacent peripheral through-hole edges being connected at a predetermined connection point. The through-hole also includes a narrow portion in which the width of the through-hole, bounded by portions of each of the two peripheral through-hole edges of the multiple peripheral through-hole edges, gradually decreases with increasing distance from the center of the base towards the peripheral edge of the base, and the narrow portion is located closer to the peripheral edge of the base than a non-narrow portion, which is bounded by other portions of each of the two peripheral through-hole edges.

[0010] The ejection device according to the present invention is configured to eject a combustion product from the ejection device to the outside, wherein the combustion product is generated by the combustion of a pyrotechnic agent contained in a receiving chamber formed by a metallic container, the combustion being initiated by the combustion of the ignition charge contained in the detonator. The pyrotechnic agent can be a predetermined gunpowder, which can be selected appropriately depending on the intended use of the combustion product to be ejected, or it can be a predetermined gas-generating agent. The bottom surface of the container forming the receiving chamber is arranged opposite the ignition area of ​​the detonator, and the peripheral wall of the container is arranged to surround the ignition area.Therefore, when the pyrotechnic agent is burned by the ignition charge at the ignition point, the combustion pressure acts on the inner wall surface of the cup. The through-hole is provided in the base of the cup, and in an early stage of combustion, some of the combustion product generated by the burning pyrotechnic agent is expelled to the outside through this through-hole. Consequently, a high load associated with the combustion is exerted on the peripheral edges of the through-hole, which form or define its boundaries.

[0011] The through-hole is bounded by several peripheral through-hole edges, and the adjacent peripheral through-hole edges are connected to each other at a predetermined connection point. The predetermined connection point is a boundary point for demarcating the adjacent peripheral through-hole edges. In the invention of the present application, if a peripheral through-hole edge changes smoothly and without abrupt changes, the peripheral through-hole edge is considered a single peripheral through-hole edge. In other words, from a geometric point of view, the peripheral through-hole edge is considered a single peripheral through-hole edge, provided that tangents to a peripheral through-hole edge are continuous.Furthermore, the through-hole includes a narrow section with a width that gradually decreases with increasing distance from the center of the base surface towards its peripheral edge. The width of the through-hole is defined as the distance between two peripheral through-hole edges in a direction perpendicular to the direction from the center of the base surface to its peripheral edge. This width can decrease continuously or exponentially with increasing distance from the center of the base surface to the peripheral edge. The two peripheral through-hole edges can be adjacent to each other or can be opposite each other instead of being adjacent.Furthermore, the opening area of ​​the through-hole can be correlated with the surface area of ​​the pyrotechnic agent, for example, to adjust the combustion of the pyrotechnic agent contained in the cup. It should be noted that if moisture protection for the pyrotechnic agent is required, the through-hole can be sealed with a known sealing tape made of aluminum foil or the like. The sealing tape is used to achieve an airtight seal for the interior of the cup, and it is preferred to use a sealing tape that does not substantially affect the combustion of the pyrotechnic agent.

[0012] In the narrow section, where, as previously described, the width of the through-hole decreases progressively, the narrowest part is its deepest end (the part furthest from the center of the base to the peripheral edge). Consequently, in an early stage of the pyrotechnic agent's combustion, the stress or pressure tends to be concentrated primarily at the deepest end, thus preferentially creating a gap at the deepest end. In other words, the through-hole is shaped to concentrate the stress caused by the emission of the combustion product in the early stage of combustion, particularly at the narrow part of the through-hole's peripheral edge. Consequently, in the early stage of combustion, a gap is created in the base of the cup, extending from the narrow section.Furthermore, in the through-bore, the narrow section is positioned closer to the peripheral edge of the base surface than a wider section. Thus, the gap extending from the narrow section quickly reaches the peripheral edge surface and continues continuously to the peripheral wall. Consequently, the peripheral wall is split vertically within the cup, i.e., from the base surface towards the igniter (in other words, away from the base surface of the cup). As a result, the combustion gas is no longer blocked by the peripheral wall of the cup in the ejection device, and the combustion product generated by the burning pyrotechnic agent can be ejected laterally, from the peripheral wall to the outer surface of the peripheral wall, i.e., laterally with respect to the ejection device.

[0013] High-precision machining, such as that required for adjusting the wall thickness of a thinned part in the prior art, is not necessary for producing this through-hole, and thus the through-hole can be formed relatively easily. From a physical perspective, it is also possible to ensure that the stress generated in an early phase of combustion is concentrated more strongly on the narrow portion than on the non-narrow portion, resulting in the previously described splitting, starting from the narrow portion and progressing to the peripheral wall, with extremely high reproducibility. Therefore, excellent combustion product ejection behavior in the ejection device according to the present invention can be expected. It should be noted that the through-hole can have a single narrow portion or several narrow portions (for example, 2 to 10).

[0014] In the previously described ejection device, the narrow section can have a lowest end, designed as a point closer to the peripheral edge of the base. If the lowest end of the narrow section is a point, then a load or force can be better concentrated and applied more precisely to this point during the early stages of the pyrotechnic device's combustion. This ensures that the gap extends from the narrow section up to the peripheral wall, thus enabling proper ejection of the combustion product. It should be noted that even if the lowest end is not a point, the load concentration in the early stages of combustion will still occur as described above, as long as the width of the through-hole progressively decreases within the narrow section.

[0015] Furthermore, in the previously described ejection device, a connection angle at the lowest end, formed at the junction between the two peripheral through-bore edges that define or form the narrow section, can be equal to or less than 120 degrees. The connection angle is defined as the angle at the junction formed by tangents to the two peripheral through-bore edges. The smaller the connection angle, the narrower and more acute the shape of the through-bore in the narrow section. Such a narrow and acute shape allows a load to be effectively concentrated on the lowest end in an early stage of combustion. Therefore, in the invention of the present application, the connection angle is preferably set to equal to or less than 120 degrees, thereby making it possible to initiate gap formation at the lowest end more reliably.

[0016] Furthermore, according to one aspect of the present invention, in the previously described ejection device, the narrow section extends up to the peripheral edge of the base surface. This design makes it possible to rapidly split the peripheral wall by the stress concentrated on the narrow section during the early stages of combustion. Moreover, because the peripheral edge of the base surface is the point where the peripheral wall and the base surface are joined, this edge has a relatively higher strength within the cup. Therefore, by forming the narrow section extending to the peripheral edge, as described above, it is possible to smoothly split the peripheral wall when the stress or pressure is applied.

[0017] In the previously described ejection device, a fragile part can be formed in the peripheral wall of the cup at a position corresponding to the narrow section. This fragile part can extend longitudinally along the cup, i.e., in the vertical direction, and can have a strength lower than that of other parts of the peripheral wall. In this case, the fragile part allows the peripheral wall to split or divide along its length. As previously described, splitting begins at the narrow section of the cup when the load is concentrated there during the early stages of combustion. By having the fragile part in the peripheral wall, the initial splitting is directed appropriately to the peripheral wall, thus ensuring more reliable lateral ejection of the combustion product from the ejection device.For example, the fragile part in the peripheral wall of the cup may be represented by a continuous line or by a dotted or dashed line extending along the vertical direction of the cup.

[0018] Furthermore, in the previously described ejection device, a stop element can be formed in the peripheral wall of the cup. This stop element is designed to halt the formation of a crack in the fragile part at a position corresponding to the fragile part, between an end on a side of the fragile part opposite the base surface and a peripheral edge on a side of the peripheral wall opposite the base surface. If the crack propagates excessively along the fragile part in the peripheral wall, fragments of the peripheral wall can be detached from the cup. Therefore, the stop element is provided to prevent the crack from propagating excessively in the peripheral wall, thus preventing the ejection of the combustion product. The stop element can be designed to divide the direction of propagation of the crack along the fragile part in the peripheral wall.

[0019] In the previously described ejection device, a perforated element can be arranged in the receiving chamber of the cup such that it covers the through-hole. This perforated element can have multiple holes dimensioned to prevent the passage of the pyrotechnic agent. By providing the perforated element in this way, it is possible to prevent the pyrotechnic agent from escaping outwards through the through-hole of the cup. Furthermore, the combustion product of the pyrotechnic agent can pass through the holes, thus preventing the formation of a crack that begins at the narrow part of the cup, as previously described.It should be noted that by appropriately adjusting the total opening area of ​​the holes in the perforated element facing the through-bore of the cup, it is possible to adjust the combustion behavior of the pyrotechnic agent in the ejection device in which the perforated element is inserted.

[0020] Two embodiments of the through-bore shape, which can be used in the previously described ejection device, are then illustrated. In a first embodiment, the narrow part can be provided as several parts within the through-bore, and these several narrow parts can have the same shape. In this case, the several narrow parts can be arranged at equal intervals along a circumferential direction of the base surface within the through-bore, with the center of the base surface serving as the central axis. When the shape of the through-bore is defined in this way, each narrow part can absorb essentially the same proportion of concentrated load or pressure, and this makes it possible for any gap originating at a particular narrow part to occur essentially simultaneously within the cup.Thus, the combustion gas can be expelled laterally from the exhaust device in a uniform and radial manner.

[0021] Furthermore, in a second embodiment, the narrow part can be defined as a width reduction rate, calculated as a reduction in the width of the narrow part due to a displacement in units of distance from the center of the base surface towards the peripheral edge of the base surface. In this case, the narrow part can be provided as multiple parts within the through-hole, and the width reduction rate of one of the narrow parts can differ from that of another. By defining the shape of the through-hole in this way, a concentrated load acting on each of the narrow parts can be deliberately controlled, thus allowing for the initiation of a gap within the cup, originating from the narrow part. The smaller the width reduction rate in the narrow part, the narrower and more pointed the narrow part becomes.Therefore, it is possible to increase the load exerted on the narrow section, thus causing the gap to form earlier. If it is desired to deliberately cause the combustion product to be preferably ejected in a predetermined direction, with the ejection device located in the center, then the through-bore can be designed to include a narrow section that, firstly, has a width reduction rate that is suitably defined, and secondly, is suitably positioned to take the predetermined direction into account.

[0022] Furthermore, the gas generator can be manufactured using the previously described ejection device. The gas generator can include the previously described ejection device and a housing containing a gas outlet for dispensing combustion gas produced by the combustion of a gas-generating gas. The housing is configured to accommodate the ejection device and the gas-generating agent. In the gas generator, the ejection device is arranged in the housing such that its bottom surface faces an inner wall surface of the housing, and the gas-generating agent is arranged along the peripheral wall. In the gas generator constructed as described above, a combustion product ejected from the ejection device is used to combust the gas-generating agent within the housing, producing combustion gas, which is then discharged from the gas outlet.As previously described, in the ejection device according to the invention of the present application, it is possible to eject the combustion product in a suitable manner in the direction of the gas-generating means which is arranged along the ejection device. Therefore, uneven combustion of the gas-generating means in the gas generator can be suppressed as far as possible, and thus the gas generator can exhibit excellent performance with regard to the generation of the combustion gas.

[0023] In the gas generator constructed using the ejection device according to the invention of the present application, it may be desirable to ensure that the combustion product is preferably ejected in a predetermined direction, with the ejection device located in the center, as described above. For example, in a gas generator comprising the ejection device and housing described above, the width reduction rate of the narrow part is defined as described above.In the gas generator, for example, the narrow part can be configured as several parts within the through-bore, and the width reduction rate in one of the narrow parts can be smaller than the width reduction rate of another narrow part. Furthermore, in a state where the ejection device is housed in the casing with a non-uniform combustion distance from the ejection device relative to the gas-generating medium located between the casing and the ejection device, the narrow part inside the casing can be oriented towards a distal region where the combustion distance from the ejection device is greatest, and the other narrow part inside the casing can be oriented towards a proximal region where the combustion distance to the ejection device is smaller than the combustion distance in the distal region.distant area. It should be noted that, in the invention of the present application, the combustion distance with respect to the gas-generating means is a distance of the propagation of the combustion of the gas-generating means caused by the combustion product that is ejected from the ejection device; in other words, the combustion distance is the width of an area in which the gas-generating means is present and which lies along the extended line of the ejection direction of the combustion product. However, the definition of the combustion distance does not change even if anything other than the combustion-generating gas is present along the extended line of the ejection direction of the combustion product.Furthermore, the distal region is not represented as a single point, but rather as an area with a certain surface area, including a point where the combustion distance to the discharge direction is greatest. In the case of a non-uniform combustion distance with respect to the gas-generating agent in the housing, as previously described, it must be taken into account that combustion of the gas-generating agent in the distal region where the combustion distance to the discharge device is relatively large will be completed later than combustion of the gas-generating agent at the distal region where the combustion distance is relatively small.When splitting occurs due to concentrated stress on the narrow section, which has a relatively low width reduction rate and where splitting occurs later than on the other narrow section, the combustion product can be preferably ejected towards the distal region by orienting the first narrow section towards the distal region and the other narrow sections towards the proximal regions. As a result, the gas-generating agent, which is located relatively far from the ejection device, can be combusted more reliably, and therefore it is possible to achieve more uniform combustion of the gas-generating agent in the housing together with the gas-generating agent at a proximal position. Therefore, the gas generator can exhibit excellent combustion gas production performance. [Advantageous effects of the invention]

[0024] The present invention makes it possible to eject the combustion product of the pyrotechnic agent laterally to the ejection device in the desired direction in a suitable manner. [Brief description of drawing] [ Fig. 1] Fig. Figure 1 is a schematic view showing the construction of an ejection device according to an embodiment of the present invention. [ Fig. 2] Fig. Figure 2 is a top view of a cup that is in the Fig. The ejection device shown in 1 is included. [ Fig. 3] Fig. 3 is a cross-sectional view of the in Fig. 1 shown ejection device. [ Fig. 4] Fig. Figure 4 is a top view of a cup contained in an ejection device according to a first modified example. [ Fig. 5] Fig. Figure 5 is an enlarged view of the top of a cup contained in an ejection device according to a second modified example. [ Fig. 6] Fig. Figure 6 is a first view showing a variant of the through-hole formed in the ejection device according to the present invention. [ Fig. 7] Fig. Figure 7 is a second view showing a variant of the through-hole formed in the ejection device according to the present invention. [ Fig. 8] Fig. Figure 8 is a third view showing a variant of the through-hole formed in the ejection device according to the present invention. [ Fig. 9] Fig. Figure 9 is a fourth view showing a variant of the through-hole formed in the ejection device according to the present invention. [ Fig. 10] Fig. Figure 10 is a first view showing a variant of a thinned part formed in a peripheral wall of the ejection device according to the present invention. [ Fig. 11] Fig. Figure 11 is a second view showing a variant of the thinned part formed in the peripheral wall of the ejection device according to the present invention. [ Fig. 12] Fig. Figure 12 is a third view showing a variant of the thinned part formed in the peripheral wall of the ejection device according to the present invention. [ Fig. 13] Fig. Figure 13 is a schematic view showing the construction of a gas generator with an ejection device according to the present invention. [ Fig. 14] Fig. Figure 14 is a schematic view showing the construction of a modified example of the generator with the ejection device according to the present invention. [Description of embodiments]

[0025] With reference to the drawings, an ejection device and a gas generator according to embodiments of the present invention are now described. It should be noted that the designs of the following embodiments are for illustrative purposes only and that the present invention is not limited to the designs of these embodiments. Example 1

[0026] Fig. Figure 1 is a schematic view showing the construction of an ejection device 100 designed to eject a combustion product of a gas-generating agent to the outside. Fig. Figure 2 is a top view of a cup 104 used in the ejection device 100; and Fig. Figure 3 is a cross-sectional view of the ejection device 100. The ejection device 100 comprises an electric igniter (hereinafter simply referred to as the "igniter") 101, which is attached to a base element 103, and a metallic cup 104, which covers an ignition area 102 of the igniter 101. The ejection device 100 is configured to combust a gas-generating agent 121 (a pyrotechnic agent) which is filled into a receiving chamber 120 located between the igniter 101 and the cup 104, and to eject the combustion gas, which is a combustion product of the gas-generating agent 121, with the ejection occurring laterally to the ejection device 100. The igniter 101 is configured to receive an ignition current supplied from an external source and to combust an ignition charge contained in the ignition area 102.Due to the generation of a combustion product resulting from the combustion, an outer shell forming the ignition area is split or divided, and the combustion product is expelled towards the gas generating agent 121 in the receiving chamber 120.

[0027] The cup 104 of the ejection device 100 comprises: a base surface 107, which is substantially circular and located opposite the ignition area 102; and a peripheral wall 105, which adjoins the peripheral edge of the base surface 107 and surrounds the ignition area 102. Furthermore, a flange 106 is provided on a portion of the peripheral edges of the peripheral wall 105, which is a peripheral edge not adjoining the base surface 107, and the flange 106 and the base element 103 are connected to each other by crimping. In the state in which the flange 106 and the base element 103 are connected to each other by crimping, a receiving chamber formed inside the cup 104 serves as the receiving chamber 120. The receiving chamber 120 is filled with the gas-generating agent 121.A suitable pyrotechnic agent can be selected as the gas-generating agent 121, which makes it possible for the combustion gas emitted by the ejection device 100 to serve as a suitable power source for a predetermined device, and the like, which is to be driven by the combustion gas. If, for example, a relatively low gas temperature (for example, in the range of 1000 to 17000 °C) is preferred as a power source, then a composition with guanidine nitrate (41 wt%), basic copper nitrate (49 wt%), and a binder and / or an additive can be used. If, on the other hand, a relatively high gas temperature (for example, in the range of 1700 to 3000 °C) is preferred, then a composition with nitroguardinine (34 wt%) and strontium nitrate (56 wt%) can be used.With regard to the form of the pyrotechnic agent, any suitable shape can be used as required, such as a disc shape, the shape of a pressed piece, or a cylindrical shape with a hole in which a through hole or a non-through hole extending from one end face to the opposite end face is formed.

[0028] A through-hole 108 is formed in the base 107 of the cup 104, allowing the receiving chamber 120, which is the interior of the cup 104, to communicate with the exterior of the cup 104. The opening area of ​​the entire through-hole 108 is relatively large, so that the granular gas-generating agent 121 can pass through the through-hole 108. Therefore, a perforated element 109 with a large number of holes, dimensioned such that the granular gas-generating agent 121 cannot pass through, is arranged to cover the through-hole 108 from the side of the receiving chamber 120, thus preventing the gas-generating agent 121, which is filled into the receiving chamber 120, from escaping through the through-hole 108.Furthermore, the size of the holes in the perforated element 109 must be set to a value such that the flow of combustion gas, generated by the combustion of the gas-generating agent 121 upon actuation of the igniter 101, is not restricted to the through-bore 108. The perforated element 109 can, for example, be an element in which the holes of the size described above are arranged in a grid-like pattern, or it can be an element containing a large number of holes in a mesh-like pattern, the holes being relatively larger than the size of the granular gas-generating agent.In the perforated element 109, the total opening area of ​​holes facing the through-bore 108 is adjusted to achieve sufficient strength to prevent breakage due to the combustion pressure generated by the combustion of the gas-generating agent 121 when the igniter 101 is actuated, and it is also adjusted to ensure optimal combustion of the gas-generating agent 121.

[0029] Based on the Fig. 2 now describes the shape of the through-hole 108. Fig. 2A is a top view of cup 104, and Fig. Figure 2B is an enlarged view of a narrow part 115a of the through-hole 108. It should be noted that in Fig. 2B the peripheral edge of the base surface 107 is represented by a dotted line. The through-hole 108 is bounded by four peripheral through-hole edges 108a, 108b, 108c and 108d, each of which is an arc. The peripheral through-hole edges that are adjacent to each other are formed such that they project to an inside (towards the center of the base surface 107) and are connected to each other in such a way that a connecting angle, defined as an angle formed between tangents of the peripheral through-hole edges at each connection point between the peripheral through-hole edges, is equal to or less than a predetermined angle (for example, 120 degrees), giving the appropriate connecting angle. Fig. 2B is the angle between the peripheral through-hole edges 108a and 108b represented by θ1. Furthermore, the peripheral through-hole edges 108a, 108b, 108c and 108d each have the same size and shape, with the center of the through-hole 108 coinciding with the center of the base surface 107, and the through-hole 108 having a shape that is point-symmetric with respect to the center.

[0030] As further in Fig. As shown in Figure 2B, the through-hole 108 comprises four narrow sections 115 in which the width of the through-hole 108 decreases with increasing distance from the center of the base surface 107 towards the peripheral edge of the base surface 107. It should be noted that the width of the through-hole 108 is limited or formed by sections of the two peripheral edges of the through-hole, which define the through-hole 108 in a direction perpendicular to the radius of the base surface 107 on which the through-hole 108 is located. In the Fig. In the through-hole 108 shown in Figure 2, the width of the through-hole 108 is defined by portions of the two adjacent peripheral through-hole edges 108a and 108b near the junction between the peripheral through-hole edges 108a and 108b, as shown in Figure 2. Fig. 2B. Furthermore, if each of the narrow parts 115 is to be designated individually, these parts are identified by adding the symbols a, b, c or d to the reference numeral “115” for the purpose of distinguishing them. For example, a narrow part formed between the peripheral through-hole edges 108a and 108b is designated 115a, a narrow part formed between the peripheral through-hole edges 108b and 108c is designated 115b, a narrow part formed between the peripheral through-hole edges 108c and 108d is designated 115c, and a narrow part formed between the peripheral through-hole edges 108d and 108a is designated 115d.

[0031] Next, the narrow section 115a is described representatively. As previously described, in the narrow section 115a, the width of the through-hole 108 decreases with increasing distance from the center of the bottom surface 107 towards the peripheral edge, and the lowest point of the narrow section 115a is a lowest end Ep (in the present example: the junction between the peripheral through-hole edge 108a and the peripheral through-hole edge 108b). As in Fig. As shown in Figure 2B, the width of the through-hole 108 on the side of the center point is represented, for example, by W1, and the width of the through-hole 108 on the side of the peripheral edge is represented by W2 (W2 < W1). Furthermore, the lowest end Ep is a part that lies closest to the peripheral edge of the base surface 107 in the narrow part 115a. In the present example, the lowest end Ep lies essentially on the peripheral edge of the base surface 107. It should be noted that the other structural aspects of the narrow parts 115b, 115c, and 115d are the same as those of the narrow part 115a.

[0032] Furthermore, in the peripheral through-hole edges 108a and the other peripheral through-hole edges forming the through-hole 108, a portion that does not form the narrow 115a or the other narrow portions is referred to as a non-narrow portion. Fig. 2A is a non-narrow part 125a formed between the narrow parts 115a and 115d. Similarly, a non-narrow part 125b is formed between the narrow parts 115a and 115b, a non-narrow part 125c is formed between the narrow parts 115b and 115c, and a non-narrow part 125d is formed between the narrow parts 115c and 115d. As in Fig. As shown in Figure 2, the narrow part 115a and the other narrow parts are arranged closer to the peripheral edge of the base surface 107 than the non-narrow part 125a and the other non-narrow parts. In other words, the through-hole 108 has a shape that incorporates the narrow part 115a and the other narrow parts that are closer to the peripheral edge of the base surface 107, and the non-narrow part 125a and the other non-narrow parts that are farther away from the peripheral edge of the base surface 107.

[0033] In the cup 104, which contains the previously described through-hole 108, combustion gas is generated when the igniter 101 is activated and subsequently the gas-generating agent 121, which is filled into the receiving chamber 120, is burned. Since the through-hole 108 is provided in the cup 104, a flow of the generated combustion gas is created, which exits to the outside through the through-hole 108. In this situation, the bottom surface 107 of the cup 104 is arranged such that it resists the flow. Thus, in an early phase of the combustion gas generation (an early phase of the combustion of the gas-generating agent 121), the combustion gas exerts a resistance force on the bottom surface 107 (upward-pointing arrows 1 represent the resistance force).

[0034] In particular, the through-bore 108 includes the narrow part 115a and the other narrow parts, and the non-narrow part 125a and the other non-narrow parts, as previously described, and the load from the combustion gas tends to be exerted mainly on the non-narrow part 125. Since the narrow part 115a and the other narrow parts are formed between the non-narrow part 125a and the other non-narrow parts, and since the width of the through-bore 108 progressively decreases towards the deepest ends Ep, the load or pressure increases.which is caused by the resistance with respect to the combustion gas flowing out of the interior of the cup 104, in the direction of the lowest ends Ep of the narrow part 115a and the other narrow parts along the two peripheral through-bore edges that form the narrow part 115a and the other narrow parts (for example, the two peripheral through-bore edges 108a and 108b that bound the narrow part 115a), and thus the load exerted on the bottom surface 107 is extremely high at and near the lowest ends Ep.On the other hand, the non-narrow part 125a and the other non-narrow parts absorb compressive forces that allow them to deform in the axial direction of the cup 104. However, unlike the narrow part 115a or the other narrow parts, the non-narrow part 125a and the other non-narrow parts do not contain a portion where the load tends to concentrate. If the through-bore 108, which has the shape described above, is provided in the bottom surface 107, it is possible to provide a portion at or near the lowest end Ep where a load tends to concentrate on the bottom surface 107 during the early stages of combustion of the gas-generating agent 121, thus controlling the formation of cracks in the cup 104.

[0035] Consequently, in the early phase of the combustion of the gas-generating agent 121, a load is concentrated on a part located at or near the lowest end Ep on the base surface 107, and therefore it is possible to form a gap preferably at this part, which serves as a starting point for gap formation, compared to the other parts in the base surface 107. As further described above, the narrow part 115a and the other narrow parts containing the lowest end Ep are arranged closer to the peripheral edge of the base surface 107 compared to the non-narrow part 125a and the other non-narrow parts, and thus the gap that begins to form from the part located at or near the lowest end Ep in the base surface 107 rapidly reaches the peripheral edge of the base surface 107 and continues to the peripheral wall 105.In other words, the non-narrow part 125a and the other non-narrow parts have a shape in which a load concentration does not occur easily, and they are arranged away from the peripheral edge of the base surface 107, and thus a crack formation starting at the non-narrow part 125a and the other non-narrow parts in the base surface 107 is less likely to occur, and even if this crack formation does occur, the crack does not easily reach the peripheral wall 105.

[0036] As previously described, in the ejection device 100, during the early phase of combustion of the gas-generating agent 121, the activation of the igniter 101 concentrates the load at a predetermined part (a part located at or near the lowest end Ep) in the base surface 107, and as a consequence, cracking begins at the predetermined parts of the base surface 107, and the crack propagates into the peripheral wall 105. Furthermore, since the crack begins at the base surface 107, it is to be expected that the crack in the peripheral wall 105 will extend along the vertical (longitudinal) direction of the cup 104.In the present example, the peripheral wall 105 includes thinned portions 105a at positions corresponding to the four narrow parts, including the narrow portion 115a and the other narrow parts. These thinned portions extend in the vertical direction of the cup 104, thus creating the vertical gap in the peripheral wall 105. The thickness of the thinned portion 105a is less than that of the other parts of the peripheral wall 105, and therefore the thinned portion 105a is relatively fragile. When the peripheral wall 105 is split vertically in the direction of the cup 104, as described above, a state is reached in which the ejection device 100 is triggered or exposed on its side. Consequently, the combustion gas produced after the early phase of combustion is also ejected laterally from the ejection device 100 (in the directions of the white arrows shown in Figure 1). Fig. 1 and Fig. 3 are shown) ejected.

[0037] Furthermore, the predetermined portion where the load is concentrated in the base surface 107 in the present example depends on the shape of the through-bore 108, and therefore the gap formation can begin as intended and with high reproducibility in the cup 104. Since the narrow part 115a and the other narrow parts of the ejection device 100 are designed to have the same shape, the gap formation begins at the narrow parts 115 and extends in the base surface 107 and the peripheral wall 105 in essentially the same way. Therefore, the combustion gas can be ejected laterally from the ejection device 100 in a uniform and radial manner.

[0038] Furthermore, the through-hole 108 can be produced in a relatively simple manner using a press of the same type, and the manufacturing requirements for this are significantly reduced compared to the prior art requiring the execution of a thickness control at the thinned scoring lines or the like. It should be noted that, since the thinned portion 105a is positioned on the peripheral wall 105 of the cup 104 in such a way as to guide the direction of the scoring that has already begun in the cup 104, the thickness of the thinned portion 105a does not need to be set with great precision. Modified Example 1

[0039] Based on the Fig. Section 4 describes a first modified example of the ejection device 100. Fig. Figure 4 is a top view of the cup 104. The difference between the present modified example and the first example is that the connecting end of the narrow part 115a of the through-bore 108 does not reach the peripheral edge of the bottom surface 107. In other words, in the present modified example, there is a distance ∧L between the lowest end Ep and the narrow part 115a and the peripheral edge of the bottom surface 107. Even if the through-bore 108 is configured in this way, once the igniter 101 is actuated and the gas-generating medium 121 is burned, producing combustion gas, a load will be concentrated on the narrow part 115a and the other narrow parts of the through-bore 108. Consequently, a gap will appear in the bottom surface 107, starting at the narrow part 115a and the other narrow parts.After reaching the peripheral edge of the base surface 107, the gap continues continuously in the peripheral wall 105 in the vertical direction of the cup 104, similar to the example described above, and as a result, the combustion gas can be ejected laterally from the ejection device 100. Modified Example 2

[0040] Based on the Fig. Section 5 describes a second modified example of the ejection device 100. Fig. Figure 5 is an enlarged partial view of the through-hole 108 provided in the cup 104, showing the narrow portion 115a and its surroundings. The difference between the present modified example and the first modified example is that in this modified example, the peripheral through-hole edge 108a and the peripheral through-hole edge 108b are not directly connected, and the peripheral through-hole edge 108a and the peripheral through-hole edge 108d are connected by an extremely short peripheral through-hole edge 108x lying between them. The length of the peripheral through-hole edge 108x is ΔW0. In this case, the width of the through-bore 108 is a distance between the peripheral through-bore edge 108a and the peripheral through-bore edge 108b facing each other, along a direction perpendicular to the radius of the base surface 107. Also in Fig. 5. The width of the through-bore 108 in the narrow section 115a gradually decreases with increasing distance from the center of the base surface 107 to the peripheral edge. Again, if the through-bore 108 is designed in this way, once the igniter 101 is activated and the gas-generating agent 121 is burned, producing combustion gas, a load is concentrated on the narrow section 115a and the other sections of the through-bore 108. Consequently, a gap appears in the base surface 105, starting at the narrow section 115a and the other narrow sections. After reaching the peripheral edge of the base surface 107, the gap continues continuously in the peripheral wall 105 in the vertical direction of the cup 104, similar to the example described previously, and consequently, the combustion gas can be ejected laterally from the ejection device 100. Modified Example 3

[0041] Based on the Fig. 6, Fig. 7, Fig. 8 to Fig. Section 9 describes a third modified example of the ejection device 100. This modified example differs from the first example in the shape of the through-bore 108. In the figures relating to this modified example, the narrow part 115a, formed by the peripheral through-bore edge 108a and the peripheral through-bore edge 108b, is shown as an example of the narrow part of the through-bore 108, although the person skilled in the art will recognize from the drawings that the through-bore 108 can be another narrow part with a similar structure.

[0042] First, in the Fig. In the variant shown in Figure 6, the through-hole 108 is formed as an equilateral triangle. In this case, three peripheral edges of the through-hole, which form the through-hole 108, are straight. Furthermore, three identically shaped narrow parts, including the narrow part 115a, which is in Fig. Figure 6 shows that the elements are arranged uniformly along the peripheral edge of the base surface 107. Non-narrow parts, each formed between the narrow parts, are located further from the peripheral edge than the narrow parts. Next, in a variant shown in Figure 6, the elements are arranged evenly along the peripheral edge of the base surface 107. Non-narrow parts, each formed between the narrow parts, are located further away from the peripheral edge than the narrow parts. Next, in a variant shown in Figure 6, the elements are arranged evenly along the peripheral edge of the base surface 107. Fig. Figure 7 shows the through-hole 108, which has a so-called star shape. In this case, ten peripheral through-hole edges forming the through-hole 108 are straight. Furthermore, five narrow parts of identical shape are present, including the narrow part 115a, which is shown in Fig. Figure 7 shows that the parts are arranged uniformly along the peripheral edge of the base surface 107. Non-narrow parts, each formed between two narrow parts, are located further away from the peripheral edge than the narrow parts.

[0043] In a Fig. In the variant shown in Figure 8, the through-bore 108 is formed by three arcs of the same shape. Furthermore, three identically shaped narrow parts are included, including the narrow part 115a, which is located in Fig. Figure 8 shows that the components are arranged uniformly along the peripheral edge of the base surface 107. Non-narrow parts, each formed between two narrow parts, are located further from the peripheral edge than the narrow parts. Finally, in a Fig. In the variant shown in Figure 9, the through-bore 108 is formed by two arcs with different shapes and has a so-called crescent shape. Furthermore, there are two identically shaped narrow parts, including the narrow part 115a, which is located in Fig. Figure 9 shows the arrangement along the peripheral edge of the base surface 107. Non-narrow parts, each formed between two narrow parts, are located further from the peripheral edge than the narrow parts.

[0044] Even if the through-hole 108 is designed as in Fig. 6, Fig. 7, Fig. 8 to Fig. As shown in Figure 9, as soon as the igniter 101 is activated and the gas-generating medium 121 is burned to produce combustion gas, a load is concentrated on the narrow part 115a and the other narrow parts of the through-bore 108. Consequently, a gap appears in the bottom surface 107, starting at the narrow part 115a and the other narrow parts. After reaching the peripheral edge of the bottom surface 107, the gap continues continuously in the peripheral wall 105 in the vertical direction of the cup 104, similar to the example described previously, and as a result, the combustion gas can be ejected laterally from the ejection device 100. Modified Example 4

[0045] Based on the Fig. 10, Fig. 11 to Fig. 12 describes a fourth modified example of the ejection device 100. Fig. Figure 10 is a side view of the ejection device 100. The present modified example differs from the first example with respect to a design including a thinned section provided in the peripheral wall 105. In the first example described above, the peripheral wall 105 contains the thinned sections 105a, which are designed to promote the formation of a gap in the peripheral wall 105 in the vertical direction of the cup 104. In the present modified example, a thinned section is provided for stopping the gap formation at a predetermined position in the peripheral wall 105.

[0046] In particular, one in Fig. In the variant shown in Figure 10, at a terminal end of the thinned part 105a, which is a terminal end on the side of the detonator 101 (i.e., a terminal end on the opposite side of the thinned part with respect to the base surface 107), an annular thinned part 105b is provided adjacent to the thinned part 105a. It should be noted that the thinned part 105b does not abut the peripheral edge of the peripheral wall 105 on the side of the detonator 101. When the annular thinned part 105b is used in this form, a stress that causes cracking in the thinned part 105a is fanned out and attenuated at the annular thinned part 105b, thus interrupting further expansion of the crack in the peripheral wall 105. Furthermore, in a Fig. In the variant shown in Figure 11, an arc-shaped thinned section 105b, spaced apart from the thinned section 105a, is provided at a terminal end of the thinned section 105a, which is a terminal end on the side of the detonator 101. It should be noted that the thinned section 105b does not abut the peripheral edge of the peripheral wall 105 on the side of the detonator 101. When the arc-shaped thinned section 105b is used in this form, the stress that causes the gap running in the thinned section 105a is similarly widened and then attenuated at the thinned section 105b, thus interrupting the further propagation of the gap in the peripheral wall 105. Furthermore, in a Fig. In the variant shown in Figure 12, thinned parts 105b1 and 105b2 are provided at a terminal end of the thinned part 105a, which is a terminal end on the side of the detonator 101. These thinned parts are adjacent to the thinned part 105a and are forked in two directions. It should be noted that neither thinned part 105b1 nor 105b2 adjoins the peripheral edge of the peripheral wall 105 on the side of the detonator 101. When the thinned parts 105b1 and 105b2, which fork in two directions, are used, a stress that causes a gap extending in the thinned part 105a is similarly widened and subsequently attenuated by the thinned parts 105b1 and 105b2, thus preventing the further propagation of the gap in the peripheral wall 105.

[0047] If, as previously described, the thinned part 105b (105b1 and 105b2) is provided for stopping, which is designed to halt the gap in the peripheral wall 105 at a predetermined location, fragments of the peripheral wall 105, which are produced due to the gap created for the lateral ejection of the combustion gas, remain connected to the body of the cup 104, and consequently, detachment of the fragments due to the ejection of the combustion gas can be prevented. The thinned parts 105b (105b1 and 105b2) are each arranged at a predetermined position located between the terminal end of the thinned part 105a and the peripheral edge of the peripheral wall 105 to ensure sufficient strength to hold the fragments of the peripheral wall 105 after the gap formation, and the peripheral wall 105 is partially removed to allow the combustion gas to escape laterally and without obstruction. Example 2

[0048] A gas generator 1, which includes the ejection device 100 of the first example described above, is now based on the Fig. 13 described. Fig. Figure 13 is a cross-sectional view of the gas generator 1 along a vertical direction. The gas generator 1 is configured to combust a gas-generating agent contained within a housing 4 formed by an upper shell 2 and a lower shell 3, thereby expelling combustion gas. It should be noted that the gas generator 1 is a so-called dual gas generator, comprising two combustion chambers arranged accordingly on the upper and lower sides, each combustion chamber containing an igniter and a gas-generating agent (one of the combustion chambers being the ejection device 100 in the form of the igniter), as described below. The upper shell 2 comprises a peripheral wall 2c and a top surface 2d, forming a recessed interior. The top surface 2d and a bottom surface 3b of the lower shell 3 are substantially round, respectively.The circular shape in plan view and the peripheral wall 2c and a peripheral wall 3a of the lower shell 3 enclose the top surface 2d and the bottom surface 3b accordingly, forming a wall surface with an annular shape extending substantially perpendicularly from each surface. The interior of the upper shell 2 is a first combustion chamber 21 filled with a first transfer charge 24 and a first gas-generating agent 22, as described below. The top surface 2d is connected to one end of the peripheral wall 2c, and the other end of the peripheral wall 2c serves as an opening in the upper shell 2. Furthermore, at the other end of the peripheral wall 2c, a corresponding wall 2a and a section 2b are provided from the opening in this order.The radius of the interior formed by the corresponding wall 2a is larger than the radius of the interior formed by the peripheral wall 2c near the top surface 2d, and the corresponding wall 2a is connected to the peripheral wall 2c, with the installation section 2b lying in between.

[0049] Furthermore, the lower shell 3 includes the peripheral wall 3a and the bottom surface 3b, which form an interior space with a concave shape. This interior space is a second combustion chamber 25, which is filled with a second gas-generating agent 29. The bottom surface 3b is connected to one end of the peripheral wall 3a, and the other end of the peripheral wall 3a serves as an opening in the lower shell 3. The radius of the interior space formed by the peripheral wall 3a is essentially equal to the radius of the interior space formed by the peripheral wall 2c of the upper shell 2. The bottom surface 3d of the lower shell 3 is provided with a hole or bore to which a first detonator 23 is attached, and with a bore to which the previously described ejection device 100, which constitutes a second detonator, is attached.

[0050] Furthermore, a partition wall 10 is arranged in the housing 4 between the upper shell 2 and the lower shell 3. The partition wall 10 comprises a terminal end 15, a partition wall 14 connected to the terminal end 15 and essentially dividing the interior of the housing 4 into an upper and a lower space, a peripheral wall 13 connected to the partition wall 14 and extending along the receiving wall element 16, which is described below, and an end 12 arranged to partially cover an opening in the receiving wall element 16. Note that a through-hole 11 is formed at the end 12. The cylindrical receiving wall element 12 is arranged on the bottom surface 3b such that it surrounds the first detonator 23 in its vertical direction, with the first detonator 23 being attached to the bottom surface 3b of the lower shell 3.The upper opening of the receiving wall element 16 is covered by the end 12 of the subdivision wall 10. The first transfer charge or propellant charge 24 is placed in a predetermined space 20, which is the interior of the receiving wall element 16, but is not contained in a space occupied by the first detonator 23. Note that the first transfer charge 24 is placed in an aluminum receiving container 18, which substantially fills the predetermined space 20. A gas-generating agent with excellent ignitability and a combustion temperature higher than that of the first gas-generating agent 22 can be used as the first transfer charge 24. The combustion temperature of the first transfer charge 24 can be in the range of 1700 to 3000 °C. Examples of the first transfer charge 24 include a pellet-shaped or cylindrical transfer charge containing, for example, nitroguanidine (34 wt%) and strontium nitrate (56 wt%).In the first combustion chamber 21, the first through-bore 11, which essentially serves as the opening of the predetermined space 20, is closed by an aluminum band 36, thus preventing mixing with the first gas-generating medium 22, which is filled into a space above the predetermined space 20 (a space that is essentially above the partition wall 14).

[0051] Furthermore, a through-hole 17 is provided in a portion of the peripheral wall of the receiving wall element 16, which is located on the opposite side of the peripheral wall from the ejection device 100. The through-hole 17 allows a connection between the two chambers (the first combustion chamber 21 and the second combustion chamber 25) formed by the partition wall 10. It should be noted that the through-hole 17 is closed off by a wall surface of the receiving container 18 from the side of the predetermined chamber 20. When such a configuration is used, a difference in burst pressure occurs on the wall surfaces of the receiving container 18, and thus the receiving container 18 is only split or divided when the ejection device 100 in the second combustion chamber 25 is activated, as described below.

[0052] When the partition wall 10 is attached to the lower shell 3 in the manner described above, the upper shell 2 is attached from above. As previously described, the upper shell 2 is snugly connected to the lower shell 3 because the radius of the interior formed by the corresponding wall 2a of the upper shell 2 is larger than the radius of the interior formed by the peripheral wall 2c, thus ensuring that the system section 2b abuts the connection end 15 of the partition wall 10. It should be noted that within the housing 4, corresponding parts and contact elements, the upper shell 2 and the lower shell 3, are joined together by any suitable joining method (for example, by welding) in such a way as to prevent moisture and the like from entering the housing 4 and from the gas generating medium.

[0053] As previously described, the interior of the housing 4 is essentially divided into two compartments by the partition wall 10, located on the upper and lower sides. Within the interior of the housing 4, the first combustion chamber 21, which is bounded by the upper shell 2 and the partition wall 10, contains the first igniter 23, the first transfer charge 24, and the first gas-generating device 22. The second combustion chamber 25, which is bounded by the lower shell 3 and the partition wall 10, contains the ejection device 100 and the second gas-generating device 29. Thus, the gas generator 1 is configured as a dual gas generator with the first igniter 23 and the ejection device 100. It should be noted that the first fuze 23 and the ejection device 100 are each attached to the bottom surface 3b of the lower casing 3, and that thus the side of the first fuze 23 is surrounded by the receiving wall element 16.

[0054] In the first combustion chamber 21, the space above the aluminum strip 36, which closes the opening of the predetermined space 20, is filled with the first gas-generating agent 22, and an annular filter 32 is arranged to enclose the first gas-generating agent 22. The first gas-generating agent 22 is filled in a state in which it is pressurized by the preload force exerted on the filter 32, the partition wall 14, and the like by a cushion 31, thus preventing unnecessary vibrations of the first gas-generating agent 22 in the first combustion chamber 21. The first gas-generating agent 22 is a gas-generating agent with a combustion temperature lower than that of the first transfer charge 24. It is preferred that the first gas-generating agent 22 has a combustion temperature in the range of 1000 to 1700 °C.Furthermore, for example, the first gas-generating agent 22 can be a cylindrical gas-generating agent with a single bore, containing guanidine nitrate (41 wt%), basic copper nitrate (49 wt%) and a binder and / or an additive.

[0055] Filter 32 is formed by arranging flat woven stainless steel meshes radially and compressing the meshes in both the radial and axial directions. Filter 32 is designed to cool the combustion gas of the first gas-generating agent 22 and to filter out combustion residues contained in the combustion gas. Alternatively, a filter with a coiled wire structure, in which a wire is wound onto a core rod, forming multiple layers, can be used as filter 32. It should be noted that filter 32 also filters the combustion residues of the second gas-generating agent 29, which is filled into the second combustion chamber 25. Furthermore, a gap 33, formed between the peripheral wall 2c of the upper shell 2 and filter 32, creates a gas passage surrounding filter 32 and has an annular cross-sectional shape in the radial direction.The gap 33 allows the combustion gas to penetrate the entire area of ​​the filter 32, thus enabling efficient use of the filter 32 and effective cooling and purification of the combustion gas. The combustion gas flowing through the gap 33 reaches a gas outlet port 5, which is provided in the peripheral wall 2c. Furthermore, to prevent moisture from entering the housing 4 from the outside, the gas outlet port 5 in this gas generator 1 is closed from the inside of the housing 4 by an aluminum band 34 before it is activated.

[0056] The second combustion chamber 25 is then filled with the second gas-generating agent 29, corresponding to the ejection device 100, which is attached to the bottom surface 3b of the lower shell 3. The second combustion chamber 25 is a space bounded by the inner wall surface of the peripheral wall 3a of the lower shell 3 and the receiving wall element 16, which serves as side surfaces, by the bottom surface 3b of the lower shell 3, which serves as a bottom surface, and by the dividing wall 14 of the dividing wall 10, which serves as a top surface. Furthermore, for the second gas-generating agent 29, a monoporous cylindrical material consisting of guanidine nitrate (41 wt%), basic copper nitrate (49 wt%), and a binder or additive can be used, similarly to the first gas-generating agent 22.

[0057] In the gas generator 1 constructed in this manner, the first propellant 24 is ignited by activating the first igniter 23, and the first gas-generating agent 22 is then combusted. Subsequently, the combustion gas produced by the first gas-generating agent 22 is expelled to the outside via the gas outlet connection 5 and the filter 32. When the discharge device 100 is then actuated, the second gas-generating agent 29 is combusted.

[0058] This is how it is, as in Fig. As shown in Figure 13, the second combustion chamber 25 on the side of the lower shell 3 is filled with the second gas-generating agent 29 on the side of the ejection device 100. In this respect, it can be seen that this state differs from the state in which the first gas-generating agent 22, which is filled into the first combustion chamber 21 on the side of the upper shell 2, is positioned above the first igniter 23. As shown in the first example above, the ejection device 100 appropriately ejects combustion gas (combustion gas produced by the combustion of the gas-generating agent 121) laterally from the ejection device 100.That is, unlike a flow that is generated when a portion of the combustion gas collides with the partition wall 10 through the through-bore 108 formed on the bottom surface 107 of the cup 104 and is reflected towards the side of the bottom surface 3b of the lower shell 3, another flow is generated that is discharged laterally and radially from the peripheral wall 105 of the cup 104. Thus, in the dual gas generator 1, as shown in . Fig. As shown in Figure 13, the combustion gas is effectively fed to the second gas-generating agent 29, which is filled into the second combustion chamber 25, and therefore the second gas-generating agent 29 can be effectively combusted to produce the combustion gas. The combustion gas expelled from the discharge device 100 and the combustion gas produced by the combustion of the second gas-generating agent 29 are expelled from the gas outlet connection 5 through the through-bore 17 via the first combustion chamber 21 to the outside. Modified Example 1

[0059] Based on the Fig. 14 now describes a modified example 1 of the gas generator 1. Fig. Figure 14 is a view of the inside of the lower shell 3 of the gas generator 1 of the present modified example, viewed from above. One difference between the present modified example and the second example is the shape of the through-hole 108 provided in the bottom surface 107 of the cup 104 of the ejection device 100. In the present modified example, the through-hole 108 is configured to form an isosceles triangle. In particular, the through-hole 108 is formed by the peripheral through-hole edges 108a and 108b of equal length and the peripheral through-hole edge 108c of a length shorter than that of the preceding edges 108a and 108b. Consequently, as shown in Figure 14, the through-hole 108 is formed by the peripheral through-hole edges 108a and 108b of equal length and the peripheral through-hole edge 108c of a length shorter than that of the preceding edges 108a and 108b. Fig. Figure 14 shows the cup-like shape of the ejection device 100 elongated.

[0060] Furthermore, the narrow part formed by the peripheral through-hole edges 108a and 108b is designated 115a, the narrow part formed by the peripheral through-hole edges 108b and 108c is designated 115b, and the narrow part formed by the peripheral through-hole edges 108c and 108a is designated 115c. If a reduction in the width of the narrow part due to a displacement expressed in unit distances from the center of the base surface 107 to the edge of the base surface 107 into the narrow part is defined as a width reduction rate of the narrow part, then the width reduction rate of the narrow part 115a is smaller than the width reduction rates of the other narrow parts 115b and 115c. It should be noted that the width reduction rate of the narrow part 115b is the same as the reduction rate of the narrow part 115c.

[0061] In the ejection device 100, in which the through-bore 108 is configured in this way, the narrow part 115a, with a smaller width reduction rate, experiences a greater load in an early phase of the combustion of the gaseous fuel 121 than the other narrow parts 115b and 115c. Consequently, splitting in the region of the bottom surface 107 occurs earlier near the narrow part 115a than in the other narrow parts 115b and 115c. Therefore, in the second combustion chamber 25, the second gas-generating fuel 29, which is located near the narrow part 115a, can be combusted more preferentially than the second gas-generating fuel 29, which is located near the narrow parts 115b and 115c.

[0062] Because the first igniter 23 is arranged in the second combustion chamber 25, the ejection device 100 is displaced in its position away from the center of the second combustion chamber (i.e., a positional displacement to the right side occurs). Fig. 14), and furthermore, the receiving wall element 16 is arranged inside the second combustion chamber 25. If a distance over which the combustion of the second gas-generating agent 29 propagates through the combustion product ejected by the ejection device 100 is defined as a combustion distance or combustion path, then the combustion distance from the ejection device 100 in the second combustion chamber 25 varies depending on the position of the ejection device 100 and the receiving wall element 16 in the second combustion chamber 25. For example, if the ejection device 100 is located in the middle in Fig. If the combustion distance to the ejection device 100 is located in an area near the inner wall surface on the right side of the lower shell 3, then the combustion distance is relatively small, whereas, on the other hand, in areas near the inner wall surface on the left side of the lower shell 3 and on the rear surface of the receiving wall element 16, the combustion distance to the ejection device 100 is relatively large. If the ejection device 100 is located in the middle based on the combustion distance, then the first-mentioned area is referred to as the proximal or nearby area and the last-mentioned area as a distal or distant area.

[0063] With regard to the properties of the ejection device 100 and the positional arrangement of the ejection device 100 and the receiving wall element 16 in the second combustion chamber 25, in the present modified example, as in Fig. As shown in Figure 14, the ejection device 100 is attached to the lower shell 3 in a state in which the narrow part 115a of the ejection device 100 is oriented towards the distal region, which is a region on the side of the rear surface of the receiving wall element 16, and the other narrow parts 115b and 115c are oriented towards the proximal region, which is a region near the inner wall surface on the right side of the lower shell 3. As a result, the combustion gas, which is primarily ejected near the narrow part 115a, collides with the receiving wall element 16 and splits, as shown in Figure 14. Fig.14 is shown, and then rapidly reaches the distal area on the rear side of the receiving wall element 16 and near the inner wall surface on the left side of the lower shell 3. By arranging the ejection device 100 in this way, the second gas-generating agent 29, which is located far from the ejection device 100, can be combusted appropriately, and the combustion of the second gas-generating agent 29 in the second combustion chamber 25 can be made uniform.As further described in the first example, the through-bore 108 can be formed relatively easily using a press or the like, so that the effort in manufacturing can be significantly reduced compared to the effort required to adjust the wall thickness when a thinned part is produced in the prior art, and at the same time the combustion of the second gas-generating agent 29 can be made uniform, as previously described. [List of reference symbols] 1 gas generator 2 Upper cover 3 Lower cover 4 cases 5 Gas outlet connection 10 partition wall 16 Mounting wall element 21 First combustion chamber 22 First gas production device 23 First detonator 24 First transfer charge 25 Second combustion chamber 29 Second gas production means 31 cushions or pads 32 filters 100 Ejection device 101 detonators 102 Ignition range 103 Basic element 104 cups 105 Peripheral wall 105a, 105b, 105b1, 105b2 Thinned part 107 floor area 108 Through hole 108a, 108b, 108c, 108d, 108x Peripheral through-hole edge 109 Perforated element 115, 115a, 115b, 115c, 115d Narrow part 120 recording room 121 Gas production equipment 125a, 125b, 125c, 125d Non-narrow part Ep Lowest End

Claims

[1] An ejection device (100) for a gas generator, the ejection device (100) for ejecting a combustion product, comprising: a detonator (101) with an ignition charge and an ignition area (102) designed to burn the ignition charge; a pyrotechnic device (121) arranged to be burned by burning the ignition charge; a cup (104) made of metal, wherein the cup (104) has a base (107) and a peripheral wall (105), wherein the bottom surface (107) is arranged opposite the ignition area (102), the peripheral wall (105) adjoins a peripheral edge of the bottom surface (107) and is arranged to surround the ignition area (102), wherein the cup (104) further comprises a receiving space (120) which is defined by the peripheral wall (105) and the floor area (107) is formed and receives the pyrotechnic agent (121), wherein the bottom surface (107) of the cup (104) contains a through-hole (108) through which the receiving chamber (120) and an exterior area of ​​the cup (104) are connected, wherein the through-hole (108) is formed by several peripheral through-hole edges (108a, 108b, 108c, 108d), and the adjacent peripheral through-hole edges (108a, 108b, 108c, 108d) are connected to each other at a predetermined connection point, the through-bore (108) contains a narrow part (115) in which the width of the through-bore (108), formed by each of parts of the two peripheral through-bore edges (108a, 108b, 108c, 108d) of the several peripheral through-bore edges (108a, 108b, 108c, 108d), gradually decreases with increasing distance from a center of the bottom surface (107) to the peripheral edge of the bottom surface (107), and the narrow part (115) is closer to the peripheral edge of the bottom surface (107) than a non-narrow part (125) formed by each of the other parts of the two peripheral through-bore edges (108a, 108b, 108c, 108d), and the narrow part (115) is a predetermined part in which stress due to the emission of the combustion product is concentrated, and the bottom surface (107) is designed to be split starting from the narrow part (115), and the peripheral wall (105) is designed to be split. [2] An ejection device (100) for a gas generator, the ejection device (100) for ejecting a combustion product, comprising: a detonator (101) with an ignition charge and an ignition area (102) designed to burn the ignition charge; a pyrotechnic device (121) arranged to be burned by burning the ignition charge; a cup (104) made of metal, wherein the cup (104) has a base (107) and a peripheral wall (105), wherein the bottom surface (107) is arranged opposite the ignition area (102), the peripheral wall (105) adjoins a peripheral edge of the bottom surface (107) and is arranged to surround the ignition area (102), wherein the cup (104) further comprises a receiving space (120) which is defined by the peripheral wall (105) and the floor area (107) is formed and receives the pyrotechnic agent (121), wherein the bottom surface (107) of the cup (104) contains a through-hole (108) through which the receiving chamber (120) and an exterior area of ​​the cup (104) are connected, wherein the through-hole (108) is formed by several peripheral through-hole edges (108a, 108b, 108c, 108d), and the adjacent peripheral through-hole edges (108a, 108b, 108c, 108d) are connected to each other at a predetermined connection point, the through-bore (108) contains a narrow part (115) in which the width of the through-bore (108), formed by each of parts of the two peripheral through-bore edges (108a, 108b, 108c, 108d) of the several peripheral through-bore edges (108a, 108b, 108c, 108d), gradually decreases with increasing distance from a center of the bottom surface (107) to the peripheral edge of the bottom surface (107), and the narrow part (115) is closer to the peripheral edge of the bottom surface (107) than a non-narrow part (125) formed by each of the other parts of the two peripheral through-bore edges (108a, 108b, 108c, 108d), and the narrow part (115) is a predetermined part in which stress is concentrated due to the emission of the combustion product, and the narrow part (115) extends to the peripheral edge of the bottom surface (107). [3] The ejection device (100) according to claim 1 or 2, wherein the narrow part (115) has a lowest end (Ep) which is designed as a point that is closest to the peripheral edge of the bottom surface (107). [4] The ejection device (100) according to claim 3, wherein at the lowest end (Ep) a connecting angle formed at the connection point between the two peripheral through-hole edges (108a, 108b, 108c, 108d) forming the narrow part (115) is equal to or less than 120 degrees. [5] Ejection device (100) according to any one of claims 1 to 4, wherein in the peripheral wall (105) of the cup (104) a fragile part (105a) is formed at a position corresponding to the narrow part (115), wherein the fragile part (105a) extends in a longitudinal direction of the cup (104) and has a strength that is less than that of the other parts of the peripheral wall (105), and the fragile part (105a) is formed to allow splitting of the peripheral wall (105) along the fragile part (105a). [6] The ejection device (100) according to claim 5, wherein a stop element (105b) is formed in the peripheral wall (105) of the cup (104) for stopping the formation of a gap on the fragile part (105a) at a position corresponding to the fragile part (105a) between an end on a side of the fragile part (105a) opposite the bottom surface (107) and a peripheral edge on a side of the peripheral wall (105) opposite the bottom surface (107). [7] The ejection device (100) according to any one of claims 1 to 6, wherein a perforated element (109) is arranged in the receiving space (120) of the cup (104) such that the through-hole (108) is covered, wherein the perforated element (109) contains several holes which are dimensioned such that the passage of the pyrotechnic agent (121) is not possible. [8] The ejection device (100) according to any one of claims 1 to 7, wherein the narrow part (115) is provided as several parts in the through-bore (108) and the several narrow parts (115) have the same shape, and in the through-bore (108) the several narrow parts (115) are arranged at equal intervals along a circumferential direction of the base surface (107), with a center point of the base surface (107) serving as the central axis. [9] The ejection device (100) according to any one of claims 1 to 7, wherein for the narrow part (115) a reduction amount of a width of the narrow part (115) due to a shift in the form of unit distances from the center of the base surface (107) to the peripheral edge of the base surface (107) is defined as a width reduction rate of the narrow part (115), and the narrow part (115) is formed as several parts in the through-bore (108), and a width reduction rate of one of the several narrow parts (115) differs from a width reduction rate of another narrow part (115). [10] A gas generator (1), comprising: an ejection device (100) according to any one of claims 1 to 9; and a housing (4) with a gas outlet connection (5) for dispensing combustion gas produced by combustion of a gas-generating means (22, 29), wherein the housing (4) is configured to accommodate the ejection device (100) and the gas-generating means (22, 29), wherein the ejection device (100) is arranged in the housing (4) such that the bottom surface (107) faces an inner wall surface of the housing (4) and the gas generating means (22, 29) is arranged along the peripheral wall (105). [11] A gas generator (1), comprising: an ejection device (100) according to any one of claims 1 to 7; and a housing (4) with a gas outlet connection (5) for dispensing combustion gas produced by combustion of a gas-generating means (22, 29), wherein the housing (4) is configured to accommodate the ejection device (100) and the gas-generating means (22, 29), wherein for a narrow part (115) a reduction amount of a width of the narrow part (115) due to a shift in the form of unit distances from a center of the floor surface (107) to the peripheral edge of the floor surface (107) is defined as a width reduction rate of the narrow part (115), the narrow part (115) is formed as several parts in the through-bore (108), and a width reduction rate in one narrow part (115) of the several narrow parts (115) is smaller than a width reduction rate of another narrow part (115), and in a state in which the ejection device (100) is received in the housing (4) with a non-uniform combustion distance to the ejection device (100) with respect to the gas-generating means (22, 29) which is arranged between the housing (4) and the ejection device (100), the narrow part (115) inside the housing (4) is oriented towards a distal region in which the combustion distance to the ejection device (100) is greatest, and the other narrow part (115) inside the housing (4) is oriented towards a proximal region in which the combustion distance to the ejection device (100) is smaller than the combustion distance in the distal region.

Images