Gas generator with cup-shaped element and ring sealing element

Abstract

A gas generator (1, 1A, 1B, 1C) comprising: a housing (10) having a top plate (12), a bottom plate (22) and a circumferential wall (13, 23), formed with a gas outlet connection (15), in the housing (10) is, a cylindrical element (30) positioned along an axis (X) of the housing (10), and has a first communication hole (32) in a circumferential wall (31) of the same, a detonator (25) is positioned inside the cylindrical element (30) and attached to the bottom plate (22) of the housing (10), a transfer charge loaded in a space which accommodates an ignition section (27) of the detonator (25) within the cylindrical element (30), a cup-shaped element (50, 150) that has a bottom surface (51, 153, 154, 155), a perimeter wall (52, 151) and an opening (53, 152) are included and positioned, so that at least part of the circumferential wall (52, 151) is in contact with an inner wall surface (31a) of the cylindrical element (30), the opening (53, 152) is arranged on the side of the top plate (12) of the housing (10), and the bottom surface (51, 153, 154, 155), which has a second communication hole (54, 156), faces the transmission charge, and a gas generating means (61) in a first space (35), outside the cylindrical element (30), and in a second space (55), inside the cylindrical element (30), characterized in that a ring sealing element (60) made of rubber or resin is positioned in the housing (10) to be in contact with at least the bottom surface (51, 153, 154, 155) of the cup-shaped element (50, 150) and the inner wall surface (31a) of the cylindrical element (30).

Description

[0001] The present invention relates to a gas generator according to the preamble of independent claim 1 or to a gas generator according to the preamble of independent claim 2. Such a gas generator is known, for example, from US 7,347,448 B2.

[0002] US patent 7,347,448 B2 discloses an invention of a pyrotechnic gas generator used in an airbag device for an automobile.

[0003] An igniter 234 is positioned inside a housing 202 and an igniter cup 260 is positioned to surround the igniter 234.

[0004] In the detonator cup 260, both ends 270 and 272 are open, and gas outlet openings 274 are formed in a side wall 268. A canister 276 filled with detonating material is positioned inside the detonator cup 260.

[0005] An igniter cup insert 264 is positioned above the canister 276, and a lower surface of the same is provided with a gas outlet orifice passage 275.

[0006] When the ignition material inside the canister 276 is burned, a combustion product of the same passes through the gas outlet opening passages 274 and 275 to ignite a gas generating agent located along the extension lines thereof.

[0007] The object of the present invention is to create a gas generator whose ignition capability of the entire gas generating agent loaded in the housing is improved.

[0008] This problem is solved according to the invention by a gas generator having the features of independent claim 1 or by a gas generator having the features of independent claim 2. Preferred embodiments are set out in the dependent claims.

[0009] A first aspect of the present invention (hereinafter referred to as "the first aspect") creates a gas generator comprising: a housing comprising a top plate, a bottom plate and a perimeter wall, formed with a gas outlet connection, inside the case a cylindrical element positioned along an axis of the housing, and has a first communication hole in a circumferential wall of the same, a detonator is positioned inside the cylindrical element and attached to the bottom plate of the housing, a transfer charge loaded in a space that accommodates an ignition section of the detonator within the cylindrical element, a cup-shaped element comprising a bottom surface, a circumferential wall and an opening, and positioned such that at least part of the circumferential wall is in contact with an inner wall surface of the cylindrical element, the opening is located on the side of the top plate of the housing, and the bottom surface, which has a second communication hole, faces the transmission charge. a gas generating device loaded in a first space, outside the cylindrical element, and in a second space, inside the cylindrical element, and A ring sealing element made of rubber or resin is positioned to be in contact with at least the bottom surface of the cup-shaped element and the inner wall surface of the cylindrical element.

[0010] A second aspect of the present invention (hereinafter referred to as "the second aspect") creates a gas generator comprising: a housing comprising a top plate, a bottom plate and a perimeter wall, formed with a gas outlet connection, inside the case a cylindrical element positioned along an axis of the housing, and has a first communication hole in a circumferential wall of the same, a detonator is positioned inside the cylindrical element and attached to the bottom plate of the housing, a transfer charge container loaded with a transfer charge and positioned to face an ignition section of the detonator within the cylindrical element, a cup-shaped element comprising a bottom surface, a circumferential wall and an opening, and positioned such that at least part of the circumferential wall is in contact with an inner wall surface of the cylindrical element, the opening is located on the side of the top plate of the housing, and the bottom surface, which has a second communication hole, faces the transmission cargo container. a gas generating device loaded in a first space, outside the cylindrical element, and in a second space, inside the cylindrical element, and A ring sealing element made of rubber or resin is positioned to be in contact with at least the bottom surface of the cup-shaped element and the inner wall surface of the cylindrical element. Description of the drawings

[0011] The present invention is fully understood from the detailed description given below and the accompanying drawings, which are given only by way of illustration and are therefore not limiting to the invention, wherein: [ Fig. 1] Fig. Figure 1 shows a cross-sectional view in an axis-X direction of a gas generator according to an embodiment of the present invention; [ Fig. 2] Fig. Figure 2 shows a partial cross-sectional view in an axis-X direction of a gas generator according to another embodiment of the present invention; [ Fig. 3] Fig. Figure 3 shows a cross-sectional view in an axis-X direction of a gas generator according to another embodiment of the present invention; and [ Fig. 4] Fig. Figure 4 shows a partial cross-sectional view in an axis-X direction of a gas generator according to another embodiment of the present invention. Detailed description of the invention

[0012] In the gas generator disclosed in US 7 347 448 B2, when the ignition material is burned within the canister 276, it is assumed that combustion gas flows through a gap between the igniter cup 260 and the igniter cup insert 264. In such a case, the ignitability of the gas generating agent is impaired along the line of extension of the gas outlet mouth passage 275.

[0013] In the gas generator of the present invention, the ignitability of the entire gas generating agent loaded in the housing is improved.

[0014] The housing is a housing used in a known gas generator and is obtained by connecting a diffuser sleeve, which is provided with a plurality of gas delivery ports, and a closure sleeve at a contact section.

[0015] A cylindrical element is formed from a metal of the same material (iron, stainless steel, or the like) as the housing and is arranged such that one end of the element rests against a bottom plate of the housing and the other end faces a top plate of the housing. The second end and the top plate may face each other with a gap between them or may be in abutting each other.

[0016] A first communication hole for releasing a combustion product generated by the combustion of a transfer charge is formed in a circumferential wall of the cylindrical element.

[0017] The height of the cylindrical element is determined in relation to a cup-shaped element such that it is within a range between the bottom plate and the top plate of the housing.

[0018] An igniter, similar to the one used in a known gas generator, can be used. For example, an igniter in which an igniter main body has an ignition section and an electrically conductive pin fixed by a resin to a metallic igniter collar is used.

[0019] When the detonator is attached to the bottom plate of the housing, the detonator collar is inserted and fixed to the inside of a hole formed in the bottom plate, but a fastening structure of the detonator is not limited to this, and a known fastening structure can be used.

[0020] The cup-shaped element is made of a metal of the same material (iron, stainless steel or the like) as the housing, and is positioned so that at least part of a circumferential wall of the same abuts the inner wall surface of the cylindrical element, an opening is arranged on the side of the top plate of the housing, and a bottom surface faces the transfer charge.

[0021] The bottom surface of the cup-shaped element has a second communication hole for venting a combustion product generated by combustion of the transfer charge, and a plurality of second communication holes are formed in a section outside a circumferential edge of the bottom surface.

[0022] A gap may be formed between the top plate of the housing and the opening of the cup-shaped element.

[0023] The circumferential wall of the cup-shaped element may have a plurality of grooves or through-holes formed in a section close to the opening. Furthermore, a groove or through-hole may be formed at an opening of the cylindrical element on the side of the top plate of the housing to align with the groove or through-hole of the cup-shaped element.

[0024] As long as the bottom surface of the cup-shaped element faces the transfer charge, the bottom surface can be in contact with the transfer charge or face the transfer charge with a gap in between.

[0025] The cup-shaped element and the cylindrical element are preferably combined such that a central axis of the cup-shaped element coincides with a central axis of the cylindrical element.

[0026] Preferably, at least part of the circumferential wall of the cup-shaped element is pressed into the inner wall surface of the cylindrical element, or the cup-shaped element is partially welded to the cylindrical element (for example, the circumferential wall is welded at a plurality of positions in the circumferential direction).

[0027] The cup-shaped element can be formed from a combination of a cylinder and a lid element (a partition wall) which closes an opening of the cylinder.

[0028] Inside the housing, a gas generating device is loaded in a first space outside the cylindrical element and a second space inside the cup-shaped element.

[0029] The first space is a space outside the cylindrical element and is an entire space, except for the second space in the cup-shaped element.

[0030] The gas generating agent can be the same gas generating agent as is used in a known gas generator.

[0031] The gas generating agent loaded in the first and second rooms may have the same shape, dimensions, composition ratio, and the like, or may have different shapes, dimensions, composition ratios, and the like.

[0032] A ring sealing element can be positioned to bear against at least the bottom surface of the cup-shaped element and the inner wall surface of the cylindrical element, and can further bear against the transfer charge.

[0033] According to the invention, the ring sealing element is made of rubber or a resin. Alternatively, the ring sealing element can be made of metal.

[0034] In the gas generator of the present invention, a known cooling filter, holder, and the like can be positioned in the housing if necessary.

[0035] When an igniter is activated, the transfer charge is ignited and burns to produce a combustion product (a flame and a high-temperature combustion gas).

[0036] Part of the combustion product is released from the first communication hole of the cylindrical element into the first space to ignite and burn the gas-generating agent, and a combustion gas is produced.

[0037] The training position and the number of initial communication holes are determined with regard to the ignitability of the gas generating agent in the first room.

[0038] The remaining portion of the combustion product is released from the second communication hole in the bottom surface of the cup-shaped element into the second chamber to ignite and combust the gas-generating agent, producing a combustion gas. At this point, with the ring-sealing element in position, no combustion gas passes through a contact section between the inner wall surface of the cylindrical element and the circumferential wall of the cup-shaped element.

[0039] A predetermined amount of the combustion product generated by burning the transfer charge is ensured in the second space, so that, in particular, the ignitability of the gas-generating agent in the second space is maintained, and the ignitability and combustibility of the entire gas-generating agent are improved.

[0040] The combustion gas produced in the first and second rooms is discharged from the gas supply connection.

[0041] The invention of a second aspect is different from the invention of the first aspect, in which a transfer cargo container is used.

[0042] The transfer cargo container can be the same type used in a known gas generator. For example, a column-shaped container made of aluminum or resin can be used as the transfer cargo container.

[0043] The transfer cargo container is positioned in the cylindrical element in such a state that a bottom surface of the same faces the ignition section of the detonator, and a top surface of the same faces the bottom surface of the cup-shaped element.

[0044] The top surface of the transfer cargo container can be against the bottom surface of the cup-shaped element, or it can be facing the bottom surface with a gap in between.

[0045] The ring sealing element is positioned to abut against the bottom surface of the cup-shaped element and the inner wall surface of the cylindrical element, and can further abut against the transfer cargo container. According to the invention, the ring sealing element is made of rubber or a resin. Alternatively, the ring sealing element can be made of metal.

[0046] When an igniter is activated, the transfer charge container is ruptured and a transfer charge within the transfer charge container is ignited and burned to produce a combustion product (a flame and a high-temperature combustion gas).

[0047] Part of the combustion product flows from the first communication hole of the cylindrical element into the first chamber to ignite and burn the gas-generating agent, and a combustion gas is produced.

[0048] A training position and the number of the first communication hole are determined with regard to the ignitability of the gas generating agent in the first room.

[0049] The remaining portion of the combustion product flows from the second communication hole in the bottom surface of the cup-shaped element into the second chamber to ignite and combust the gas-generating agent, producing a combustion gas. At this point, with the ring-sealing element in position, no combustion product passes through a contact section between the inner wall surface of the cylindrical element and the circumferential wall of the cup-shaped element.

[0050] A predetermined amount of the combustion product generated by burning the transfer charge is ensured in the second space, so that, in particular, the ignitability of the gas-generating agent in the second space is maintained, and the ignitability and combustibility of the entire gas-generating agent are improved.

[0051] The combustion gas produced in the first and second rooms is discharged from the gas supply connection.

[0052] In the inventions of the first and second aspects, it is preferred that the entire bottom surface of the cup-shaped element and the entire or part of the circumferential wall of the cup-shaped element are positioned inside the cylindrical element, and the entire or part of the circumferential wall of the cup-shaped element is in contact with the inner wall surface of the cylindrical element.

[0053] In the inventions of the first and second aspects, it is preferred that the entire cup-shaped element is positioned inside the cylindrical element, and an outer surface of the circumferential wall of the cup-shaped element and the inner wall surface of the cylindrical element are in contact with each other.

[0054] When the entire cup-shaped element is positioned inside the cylindrical element, the contact area between the outer surface of the circumferential wall of the cup-shaped element and the inner wall surface of the cylindrical element is increased, and the sealing effect of the ring sealing element and the leakage prevention effect of the combustion product are preferably further increased.

[0055] The cup-shaped element is preferably pressed into the interior of the cylindrical element.

[0056] In the inventions of the first and second aspects, it is preferred that the bottom surface of the cup-shaped element has a ring-bottom surface formed on a circumferential edge of the bottom surface, a ring-wall surface projecting from the ring-bottom surface, and a circular bottom surface surrounded by the ring-wall surface. The entire cup-shaped element is positioned inside the cylindrical element, and the circumferential wall of the cup-shaped element and the inner wall surface of the cylindrical element are in contact with each other, and The ring sealing element is inserted into a ring groove, which is surrounded by the ring bottom surface of the cup-shaped element, the ring wall surface of the cup-shaped element, and the inner wall surface of the cylindrical element.

[0057] When the ring sealing element is inserted into the ring groove, the ring sealing element is pressed and fixed from both sides through the ring wall surface of the cup-shaped element and the inner wall surface of the cylindrical element, thus preventing the combustion product from escaping from the contact section between the circumferential wall of the cup-shaped element and the inner wall surface of the cylindrical element.

[0058] When the transfer cargo container is used, as in the invention of the second aspect, the ring sealing element can also be in contact with the transfer cargo container.

[0059] In the invention of the second aspect, it is preferred that the bottom surface of the cup-shaped element has a ring-bottom surface formed on a circumferential edge of the bottom surface, a ring-wall surface projecting from the ring-bottom surface, and a circular-bottom surface surrounded by the ring-bottom surface. The ring-bottom surface of the cup-shaped element rests against a ring-end surface at an opening of the cylindrical element on the side of the top plate of the housing, and the ring-wall surface of the cup-shaped element is in contact with the inner wall surface of the cylindrical element, and The ring sealing element is in a state in which it is in contact with the inner wall surface of the cylindrical element, the bottom surface of the circle, and the transfer cargo container.

[0060] When the transfer cargo container is used, the ring sealing element is positioned in a state where it is in contact with the inner wall surface of the cylindrical element, the circular bottom surface of the cup-shaped element, and the transfer cargo container, so that the combustion product is prevented from escaping from a contact section between the ring wall surface of the cup-shaped element and the inner wall surface of the cylindrical element.

[0061] In the invention of the second aspect, it is preferred that the bottom surface of the cup-shaped element has a ring-bottom surface formed on a circumferential edge of the bottom surface, a ring-wall surface projecting from the ring-bottom surface, and a circular-bottom surface surrounded by the ring-wall surface. The ring-bottom surface of the cup-shaped element is in contact with a ring-end surface at an opening of the cylindrical element on the side of the top plate of the housing, and the ring-wall surface of the cup-shaped element is in contact with the inner wall surface of the cylindrical element. The transfer charge container is a column-shaped container having a bottom surface on the side of the detonator, a top surface on the side of the cup-shaped element, and a circumferential wall surface. The top surface has an annular top surface formed on a circumferential edge of the top surface, an annular wall surface projecting from the annular top surface, and a circular top surface surrounded by the annular wall surface. The ring sealing element is enclosed in an annular space, which is surrounded by the inner wall surface of the cylindrical element, the circular bottom surface of the cup-shaped element, the ring top surface of the transfer cargo container, and the ring wall surface of the transfer cargo container.

[0062] When the ring sealing element is inserted into the annular space, the ring sealing element is pressed from all directions and thus fixed, and the combustion product is prevented from escaping from the contact section between the annular wall surface of the cup-shaped element and the inner wall surface of the cylindrical element.

[0063] In the present invention, the combustion product generated by the combustion of the transfer charge ignites and burns the entire amount of the gas generating agent within the second space.

[0064] Therefore, the ignition capability and combustion capability of the entire gas generating medium within the combustion chamber, which includes the first and second chambers, are improved.

[0065] The gas generator of the present invention is suitable for use in an airbag device mounted on an automobile. Exemplary embodiments of the invention(1) Gas generator shown in Fig. 1

[0066] A gas generator 1 includes a housing 10 in which a diffuser sleeve 11 and a closure sleeve 21 are welded together at a contact section.

[0067] The diffuser sleeve 11 has a top plate 12 and an upper circumferential wall 13, and a flange 14 is provided at an opening therein. A plurality of gas discharge connections 15 are formed in the upper circumferential wall 13.

[0068] The breech sleeve 21 has a bottom plate 22 and a lower circumferential wall 23, and a hole for attaching a fuze 25 is formed in a central section of the bottom plate 22.

[0069] The igniter 25 is an igniter used in a known gas generator, in which, for example, an igniter collar 26 is integrated by a resin with an igniter main body which has an ignition section 27.

[0070] The fuze 25 is attached by the fuze collar 26, which is inserted into the hole in the bottom plate 22 of the breech sleeve 21.

[0071] In the fuze collar 26, the outer diameter of a section (large diameter section) positioned inside the housing 10 is larger than the outer diameter of a section (small diameter section) positioned outside the housing.

[0072] An outer surface of the small-diameter section is in contact with the hole, and an annular surface between the large-diameter section and the small-diameter section is in contact with an inner surface of the bottom plate 22.

[0073] A cylindrical element 30 is positioned inside the housing 10 along the X axis of the housing 10.

[0074] In the cylindrical element 30, a plurality of first communication holes 32 are formed in a circumferential wall 31 thereof, an opening 33 of a first end thereof, on the side of the bottom plate 22, is inserted from the outside to the fuze collar 26, which projects into the housing 10, and the first end is in contact with the bottom plate 22. An opening 34 at a second end is facing the top plate 12, slightly spaced from it.

[0075] A training position of the majority of first communication holes 32 is not restricted as long as a combustion product generated by combustion of the transmission charge is discharged from these into the first space 35.

[0076] The cylindrical element 30 on the side of the opening 33 at the first end is pressed into the fuze collar 26.

[0077] A transfer cargo container 40 is positioned within the cylindrical element 30 in a state in which it faces the ignition section 27 of the detonator 25.

[0078] The transfer charge container 40 is a column-shaped container made of aluminium, and it contains a transfer charge used in a known gas generator.

[0079] In the transfer cargo container 40, a bottom surface 41 of the same is located against the ignition section 27 of the detonator 25, and a top surface 42 of the same is facing a bottom surface 51 of the cup-shaped element.

[0080] In the gas generator 1 in Fig. 1. A transfer charge can be loaded directly inside the cylindrical element 30 without the use of a transfer charge container 40.

[0081] A cup-shaped element 50 is positioned inside the cylindrical element 30.

[0082] The cup-shaped element 50 has a bottom surface 51, a circumferential wall 52 and an opening 53, and a plurality of two communication holes 54 are formed in the bottom surface 51.

[0083] The cup-shaped element 50 is positioned so that the entire circumferential wall 52 of the same is in contact with an inner wall surface 31a of the circumferential wall 31 of the cylindrical element 30, the opening 53 is arranged on the side of the top plate 12, and the bottom surface 51 faces the transfer cargo container 40.

[0084] The cup-shaped element 50 is pressed into the cylindrical element 30.

[0085] The bottom surface 51 and the transfer cargo container 40 face each other with a gap between them, but they can be partially in contact with each other.

[0086] A ring sealing element 60 is positioned in a state in which it abuts the bottom surface 51 of the cup-shaped element 50, the inner wall surface 31a of the circumferential wall 31 of the cylindrical element 30, and the top surface 42 of the transfer cargo container 40.

[0087] The ring sealing element 60 functions to prevent the combustion product, which is generated by combustion of the transfer charge during activation, from passing through a contact section between the inner wall surface 31a of the circumferential wall 31 and the outer wall surface of the circumferential wall 52 of the cup-shaped element 50.

[0088] A gas generating means 61 is loaded in a first space 35, which is outside the cylindrical element 30, and in a second space 55, which is inside the cup-shaped element 50.

[0089] The first chamber 35 and the second chamber 55 together form a combustion chamber. With such a structure, in which the cup-shaped element 50 is pressed into the cylindrical element, as in Fig. As shown in Figure 1, even when the amount of the transfer charge varies, the position of the cup-shaped element 50 is randomly set. The gas-generating agent 61 in the second chamber 55, which is relatively difficult to ignite, is reliably ignited due to the structure of the present invention.

[0090] Next, the operation of gas generator 1 will be shown in Fig. 1, described.

[0091] When the igniter 25 is activated, the transfer charge container 40, which is positioned directly above the igniter 25, is split by a flame generated by the ignition section 27, and the transfer charge inside burns to produce a combustion product.

[0092] Part of the generated combustion product flows through the first communication holes 32 of the cylindrical element 30 into the first space 35 to ignite and burn the gas generating agent 61.

[0093] The remaining portion of the generated combustion product flows through the second communication holes 54 of the cup-shaped element 50 into the second chamber 55 to ignite and combust the gas-generating agent 61. In this case, due to the pressure exerted by the combustion product, the ring-sealing element 60 is pressed against a section of the system between the inner wall surface 31a of the circumferential wall 31 of the cylindrical element 30 and the circumferential wall 52 of the cup-shaped element 50, thus preventing the combustion product from escaping from this section. As a result, the entire remaining portion of the generated combustion product flows through the second communication holes 54 into the second chamber 55.

[0094] In this way, since the entire amount of combustion product generated by burning the transfer charge is used to burn the gas generating agent 61 in the first and second spaces 35 and 55, the ignition capability of the entire gas generating agent 61 is improved.

[0095] Furthermore, since the gas-generating agent 61 within the second chamber 55 of the cup-shaped element 50 is combusted independently of the gas-generating agent 61 in the first chamber 35, and the combustion gas thereby generated flows into the first chamber 35, the ignitability of the gas-generating agent 61 is also improved at a position spaced away from the first communication holes 32. Therefore, the ignitability of the gas-generating agent 61 is improved throughout the entire combustion chamber (the first and second chambers 35 and 55).

[0096] The combustion gas produced in the first and second rooms 35 and 55 is discharged through the gas discharge connections 15. (2) Gas generator in Fig. 2

[0097] A gas generator 1A, which is in Fig. The one shown in Figure 2 is the same as the gas generator in Figure 1. Fig. 1, except that one form of the cup-shaped element 150 differs from that in the gas generator 1 in Fig. 1 is, and with respect to this, an arrangement state of a ring sealing element 60 in the gas generator 1A is different from that in the gas generator 1.

[0098] The cup-shaped element 150 has a bottom surface, a circumferential wall 151, and an opening 152. The bottom surface includes an annular bottom surface 153 at a circumferential edge, an annular wall surface 154 projecting from the annular bottom surface 153, and a circular bottom surface 155 surrounded by the annular bottom surface 154. A plurality of secondary communication holes 156 are formed in the circular bottom surface 155.

[0099] The cup-shaped element 150 is positioned so that the entire circumferential wall 151 of the same abuts an inner wall surface 31a of a circumferential wall 31 of a cylindrical element 30, the opening 152 is arranged on the side of the top plate 12, and the circular bottom surface 155 faces a transfer cargo container 40.

[0100] The ring sealing element 60 is inserted into a ring groove 70, which is surrounded by the ring bottom surface 153 of the cup-shaped element 150, the ring bottom surface 154 of the cup-shaped element 154 and the inner wall surface 31a of the circumferential wall 31 of the cylindrical element 30.

[0101] The ring sealing element 60 is pressed from both sides through the ring wall surface 154 of the cup-shaped element 150 and the inner wall surface 31a of the cylindrical element 30 and is thereby fixed.

[0102] Due to the absorption of pressure from the combustion product, the ring sealing element 60 is pressed onto the ring bottom surface 153 of the cup-shaped element 50, so that the combustion product is prevented from escaping from a section of the system between the inner wall surface 31a of the cylindrical element 30 and the circumferential wall 51 of the cup-shaped element 150.

[0103] This makes it comparable to the gas generator 1 in Fig. 1, since the entire amount of combustion product generated by the combustion of the transfer charge is used to burn a gas generating agent 61 in first and second spaces 35 and 55, improving the ignition capability of the entire gas generating agent 61. (3) Gas generator in Fig. 3

[0104] A Gas Generator 2B, shown in Fig. 3 is the same as the gas generator 1A in Fig. 2, except that the length of a cylindrical element is shorter than in the gas generator 1A in Fig. 2, and the mounting condition of the cylindrical element and a cup-shaped element in the gas generator 1B is different from that in the gas generator 1A.

[0105] A cylindrical cooling filter 80 is installed in the gas generator 1B in Fig. 3 is used, and a cylindrical cooling filter can also be used in the gas generator 1 in Fig. 1, the gas generator 1A in Fig. 2, and a 1C gas generator in Fig. 4 can be used.

[0106] The cylindrical element 30 is positioned inside a housing 10, along the X-axis of the housing 10.

[0107] In the cylindrical element 30, a plurality of first communication holes 32 are formed in a circumferential wall 31 of the same, and an opening 33, at a first end of the same, is inserted on the outside side on a fuze collar 26, which projects into the housing 10.

[0108] The opening 33 at the first end of the cylindrical element 30 is pressed into the detonator collar 26.

[0109] The cylindrical element 30 has the same shape and structure as that of the cylindrical element 30 in Fig. 1 and Fig. 2, but has a length shorter than that of the cylindrical element 30 in Fig. 1 and Fig. 2.

[0110] In the cylindrical cooling filter 80, a lower section (on the side of the bottom plate 22) of an outer circumferential wall 80a is in contact with a lower circumferential wall 23 of the closure sleeve 21, a lower end surface 81 is in contact with a bottom plate 22, and an upper end surface 82 is in contact with a top plate 12.

[0111] A cylindrical space 19 is formed between an upper section (on the side of the top plate 12) of the outer circumferential wall 80a and the gas outlet connections 15.

[0112] A first chamber 35 is surrounded radially from the outside by the cylindrical cooling filter 80.

[0113] A transfer cargo container 40 is positioned in the cylindrical element 30 in a state in which it rests against an ignition section 27 of a detonator 25.

[0114] The transfer charge container 40 is a column-shaped container made of aluminium, and it contains a transfer charge used in a known gas generator.

[0115] A cup-shaped element 150 has the same shape as the cup-shaped element 150 in Fig. 2, and has a bottom surface, a circumferential wall 151 and an opening 152. The bottom surface has an annular bottom surface 153 on a circumferential edge, an annular wall surface 154 projecting from the annular bottom surface 153, and a circular bottom surface 155 surrounded by the annular wall surface 154.

[0116] A plurality of second communication holes 156 are formed in the circle-bottom area 155.

[0117] The cup-shaped element 150 is positioned such that the ring-bottom surface 153 is in contact with a ring-end surface 34a of an opening at a second end (see the openings 34 at the second ends in Fig. 1 and Fig. 2) of the cylindrical element 30 and the ring wall surface 154 is in contact with an inner wall surface 31a of the cylindrical element 30.

[0118] The cup-shaped element 150 is positioned so that the opening 152 is located on the side of the top plate 12, and the circular bottom surface 155 faces the transfer cargo container 40.

[0119] The cup-shaped element 150 can be pressed into the cylindrical element or partially welded to fix it in place.

[0120] When the cylindrical element 30 and the cup-shaped element 150 are welded together, in the state shown in Fig. 3, these elements are pre-welded and the transfer cargo container 40 is incorporated into it to be positioned inside the housing 10 in order to avoid any influence of the welding on the transfer cargo container 40.

[0121] A ring sealing element 60 is positioned in a state in which it is in contact with the circular bottom surface 155 of the cup-shaped element 150, the inner wall surface 31a of the cylindrical element 30 and the top surface 42 of the transfer cargo container 40.

[0122] Since the ring sealing element 60 is pressed against the circular bottom surface 155 of the cup-shaped element 150 due to the absorption of pressure from the combustion product during activation, the combustion product is prevented from escaping from a plant section between the inner wall surface 31a of the cylindrical element 30 and the ring wall surface 154 of the cup-shaped element 150.

[0123] Therefore, it is comparable to the gas generator 1 in Fig. 1, since the entire amount of combustion product generated by the combustion of the transfer charge is used to burn a gas generating agent 61 in the first chamber 35 and the second chamber 55, improves the ignition capability of the entire gas generating agent 61.

[0124] Such a combination of the cylindrical element 30 and the cup-shaped element 150, as in Fig. Figure 3 shows a reduced press-fit distance for the cup-shaped element 150 relative to the cylindrical element 30. When press-fitting and welding are performed together, welding can be carried out partially (approximately at three positions around the circumference) to such a extent that the cup-shaped element 150 is not detached from the cylindrical element 30, thus simplifying assembly and reducing the press-fit distance. (4) Gas generator in Fig. 4

[0125] A 1C gas generator in Fig. 4 is the same as the gas generator 1B in Fig. 3 except that one form of transfer cargo container differs from the one in gas generator 1B in Fig. 3, and in relation to this, the arrangement state of a ring sealing element is different.

[0126] A transfer cargo container 140 is a column-shaped container having a bottom surface 141 on the side of a detonator 25, a top surface on the side of a cup-shaped element 150, and a circumferential wall surface 142. Furthermore, the top surface has an annular top surface 143 on a circumferential edge, an annular wall surface 144 projecting from the annular top surface 143, and a circular top surface 145 surrounded by the annular wall surface 144.

[0127] The ring sealing element 60 is inserted into an annular space which is surrounded by an inner wall surface 31a of a cylindrical element 30, a circular bottom surface 155 of the cup-shaped element 150, the ring top surface 143 of the transfer cargo container 140 and the ring wall surface 144 of the transfer cargo container 140.

[0128] Since the ring sealing element 60 is pressed against the circular bottom surface 155 of the cup-shaped element 150 and the inner wall surface 31a of the cylindrical element 30 due to the absorption of pressure from the combustion product during activation, the combustion product is prevented from escaping from a section of the system between the inner wall surface 31a of the cylindrical element 30 and the ring wall surface 154 of the cup-shaped element 150.

[0129] Therefore, it is comparable to the gas generator 1 in Fig.1, since the entire amount of combustion product generated by the combustion of the transfer charge is used to burn a gas generating agent 61 in the first and second spaces 35 and 55, improving the ignition capability of the entire gas generating agent 61.

Claims

[1] A gas generator (1, 1A, 1B, 1C) comprising: a housing (10) having a top plate (12), a bottom plate (22) and a circumferential wall (13, 23), formed with a gas outlet connection (15), in the housing (10) is, a cylindrical element (30) positioned along an axis (X) of the housing (10), and has a first communication hole (32) in a circumferential wall (31) of the same, a detonator (25) is positioned inside the cylindrical element (30) and attached to the bottom plate (22) of the housing (10), a transfer charge loaded in a space which accommodates an ignition section (27) of the detonator (25) within the cylindrical element (30), a cup-shaped element (50, 150) that has a bottom surface (51, 153, 154, 155), a perimeter wall (52, 151) and an opening (53, 152) are included and positioned, so that at least part of the circumferential wall (52, 151) is in contact with an inner wall surface (31a) of the cylindrical element (30), the opening (53, 152) is arranged on the side of the top plate (12) of the housing (10), and the bottom surface (51, 153, 154, 155), which has a second communication hole (54, 156), faces the transmission charge, and a gas generating means (61) loaded in a first space (35), outside the cylindrical element (30), and in a second space (55), inside the cylindrical element (30), characterized by , that in the housing (10) a ring sealing element (60) made of rubber or resin is positioned to be in contact with at least the bottom surface (51, 153, 154, 155) of the cup-shaped element (50, 150) and the inner wall surface (31a) of the cylindrical element (30). [2] A gas generator (1, 1A, 1B, 1C) comprising: a housing (10) having a top plate (12), a bottom plate (22) and a circumferential wall (13, 23), formed with a gas outlet connection (15), in the housing (10) is, a cylindrical element (30) positioned along an axis (X) of the housing (10), and has a first communication hole (32) in a circumferential wall (31) of the same, a detonator (25) is positioned inside the cylindrical element (30) and attached to the bottom plate (22) of the housing (10), a transfer charge container (40, 140) which is loaded with a transfer charge and is positioned to face an ignition section (27) of the detonator (25) within the cylindrical element (30), a cup-shaped element (50, 150) that has a bottom surface (51, 153, 154, 155), a perimeter wall (52, 151) and an opening (53, 152) are included and positioned, so that at least part of the circumferential wall (52, 151) is in contact with an inner wall surface (31a) of the cylindrical element (30), the opening (53, 152) is arranged on the side of the top plate (12) of the housing (10), and the bottom surface (51, 153, 154, 155), which has a second communication hole (54, 156), faces the transfer cargo container, and a gas generating means (61) in a first space (35), outside the cylindrical element (30), and in a second space (55), inside the cup-shaped element (50, 150), loaded, characterized by , that in the housing (10) a ring sealing element (60) made of rubber or resin is positioned to be in contact with at least the bottom surface (51, 153, 154, 155) of the cup-shaped element (50, 150) and the inner wall surface (31a) of the cylindrical element (30). [3] The gas generator (1, 1A) according to claim 1 or 2, characterized by, that the entire bottom surface (51, 153, 154, 155) of the cup-shaped element (50, 150) and all or part of the circumferential wall (52, 151) of the cup-shaped element (50, 150) are positioned inside the cylindrical element (30), and all or part of the circumferential wall (52, 151) of the cup-shaped element (50, 150) is in contact with the inner wall surface (31a) of the cylindrical element (30). [4] The gas generator (1A) according to claim 1 or 2, characterized by , that the bottom surface of the cup-shaped element (150) has a ring-bottom surface (153) formed on a circumferential edge of the bottom surface, a ring-wall surface (154) projecting from the ring-bottom surface (153), and a circular-bottom surface (155) surrounded by the ring-wall surface (154), the entire cup-shaped element (150) is positioned inside the cylindrical element (30), and the circumferential wall (151) of the cup-shaped element (150) and the inner wall surface (31a) of the cylindrical element (30) are in contact with each other, and The ring sealing element (60) is inserted into a ring groove (70) which is surrounded by the ring bottom surface (153) of the cup-shaped element (150), the ring wall surface (154) of the cup-shaped element (150) and the inner wall surface (31a) of the cylindrical element (30). [5] The gas generator (1A) according to claim 2, characterized by , that the bottom surface of the cup-shaped element (150) has a ring-bottom surface (153) formed on a circumferential edge of the bottom surface, a ring-wall surface (154) projecting from the ring-bottom surface (153), and a circular-bottom surface (155) surrounded by the ring-wall surface (154), The ring-bottom surface (153) of the cup-shaped element (150) is in contact with a ring-end surface at an opening of the cylindrical element (30) on the side of the top plate (12) of the housing (10), and the ring-wall surface (154) of the cup-shaped element (150) is in contact with the inner wall surface (31a) of the cylindrical element (30), and The ring sealing element (60) is in a state in which it is in contact with the inner wall surface (31a) of the cylindrical element (30), the bottom circular surface (155) and the transfer cargo container (40). [6] The gas generator (1C) according to claim 2, characterized by , that the bottom surface of the cup-shaped element (150) has a ring-bottom surface (153) formed on a circumferential edge of the bottom surface, a ring-wall surface (154) projecting from the ring-bottom surface (153), and a circular-bottom surface (155) surrounded by the ring-wall surface (154), the ring-bottom surface (153) of the cup-shaped element (150) is in contact with a ring-end surface (34a) at an opening of the cylindrical element (30), on the side of the top plate (12) of the housing (10), and the ring-wall surface (154) of the cup-shaped element (150) is in contact with the inner wall surface (31a) of the cylindrical element (30), The transfer charge container (140) is a column-shaped container having a bottom surface (141) on the side of the detonator (25), a top surface on the side of the cup-shaped element (150), and a circumferential wall surface (142), and the top surface has an annular top surface (143) formed on a circumferential edge of the top surface, an annular wall surface (144) projecting from the annular top surface (143), and a circular top surface (145) surrounded by the annular wall surface (144), and The ring sealing element (60) is inserted into an annular space which is surrounded by the inner wall surface (31a) of the cylindrical element (30), the circular bottom surface (155) of the cup-shaped element (150), the ring top surface (143) of the transfer cargo container (140), and the ring wall surface (144) of the transfer cargo container (40, 140). [7] The gas generator (1, 1A, 1B, 1C) according to claim 1 or 2, characterized by , that the circumferential wall (52, 151) of the cup-shaped element (50, 150) has a plurality of grooves or through-holes formed in a section close to the opening (53, 152). [8] The gas generator (1, 1A) according to claim 1 or 2, characterized by , that the entire circumferential wall (52, 151) of the cup-shaped element (50, 150) is positioned inside the cylindrical element (30), the circumferential wall (52, 151) of the cup-shaped element (50, 150) has a plurality of grooves or through-holes formed in a section close to the opening (53, 152), A groove or through-hole is formed at an opening (53, 152) of the cylindrical element (30) on the side of the top plate (12) of the housing (10), and the groove or through-hole on the cup-shaped element (50, 150) and the groove or through-hole of the cylindrical element (30) are in agreement with each other. [9] The gas generator (1, 1A, 1B, 1C) according to claim 1 or 2, characterized by , that the gas generating agent (61) loaded into the first space (35) differs in shape, dimensions, and composition ratios from the gas generating agent (61) loaded into the second space (55).

Images