JP2006306218A - Gas generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas generator for vehicular occupant retraining device, having a simple structure, and simplifying an assembling process. <P>SOLUTION: A cylindrical housing 11 has seamless integral shape, and the inside thereof is divided into two spaces 14, 34 by a first bursting plate 16. The first bursting plate 16 is fixed to a side surface of a projecting portion 13 formed on a peripheral wall portion 18 of the cylindrical housing 11. The first bursting plate 16 is attached to either one of separated outer shell containers forming the above mentioned two spaces, and both outer shell containers need not to be connected and fixed by welding and the like. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas generator used in an automobile personnel restraint device.

  Some gas generators mainly use pressurized gas as an airbag inflation medium, those that use only a solid gas generating agent (gas generated by combustion of the gas generating agent), and those that use both. However, in any type, from the viewpoint of simplifying the assembly process, it is required to reduce the number of parts and to simplify the assembly work itself.

In a gas generator composed of a plurality of parts, reducing the number of parts as much as possible has great advantages such as simplifying the assembly process and reducing manufacturing costs. In particular, when a plurality of spaces are formed using a partition inside the housing, a separate member is used for fixing the partition and the like, and thus troubles such as processing of the separate member are generated.
US Pat. No. 5,536,040 U.S. Pat. No. 5,888,893

  In Patent Document 1, an outer shell housing is formed by combining a first tube 220 that stores pressurized gas and a second tube 224 that stores an ignition initiator 342. Each tube forms an opening having an inward flange, and a rupturable plate (closure member 266) is sandwiched between the flanges.

  On the other hand, in Patent Document 2, the outer shell housing is formed by joining a first section 90 containing an igniter and a second section 92 containing pressurized gas. In the second section 92, an inward flange is formed, and an opening is formed at the center thereof. Means 70 is arranged.

  It is an object of the present invention to provide a gas generator for a vehicle personnel restraint device with a simplified assembly process and structure.

The present invention is a gas generator for a vehicle personnel restraint device, and is used for a restraint device for protecting against collision of an occupant riding inside the vehicle and a restraint device for protecting a pedestrian who collides with a vehicle. It is an invention about a generator. That is,
As a means for solving the problems, the present invention
A cylindrical housing that is provided with a closed gas discharge port and filled with a pressurized gas and is seamless in the axial direction from one end to the other; an ignition means disposed inside the cylindrical housing; and A gas generator for a vehicle personnel restraint device comprising a gas generating agent that is ignited and burned by an ignition means, and is provided at any portion between both ends of the cylindrical housing in the axial direction on the inner wall surface of the cylindrical housing. A projecting portion facing radially inward, a first rupture member is attached to the projecting portion, the housing is divided into two spaces in the axial direction, and a pressurized gas storage space for storing a pressurized gas; In addition, the gas generator is isolated in an ignition means accommodating space for accommodating the gas generating agent, and the gas discharge port provides a gas generator for a vehicle personnel restraint device formed in the pressurized gas accommodating space.

  The present invention is a hybrid type gas generator that uses both a solid gas generating agent and a pressurized gas, and the first rupture member is broken by heat, combustion gas, etc. generated by the combustion of the gas generating agent, and the pressurized gas In communication with the storage space, the pressure of the pressurized gas storage space is increased to open the closed gas discharge port.

  As the pressurized gas, an inert gas such as argon, helium or neon, a simple substance such as nitrogen gas, or a mixture thereof can be used, and this gas is filled in the pressurized gas storage space. Further, the ignition means accommodating space is filled with a solid gas generating agent that generates at least one of high-temperature gas and heat by combustion, and both spaces are isolated by the first rupturable member. Therefore, the pressurized gas storage space and the ignition means storage space are adjacent to each other in the axial direction of the cylindrical housing via the first rupture member, and are not in communication with each other before the gas generator is activated.

  In this gas generator, the first rupturable member is supported and fixed by a protrusion formed on the cylindrical housing. The protruding portion refers to a portion where the inner diameter of the cylindrical housing is reduced, and is preferably formed integrally with the cylindrical housing. Therefore, it is preferable that the peripheral wall portion of the cylindrical housing is deformed by a press or the like and protruded radially inward. As a result, the protrusion can be easily formed by a press or the like, so that the assembly process is simplified. Further, since the shape of the part itself can be simplified, the structure of the gas generator can be simplified.

  The protrusion may be any one that can support and fix the first rupturable member, and may be two or more separate and independent discontinuous protrusions in addition to the circumferentially continuous protrusion (annular protrusion). From the viewpoint of contact with the member or sealing of the pressurized gas, a continuous annular protrusion is preferable. When the protrusion is formed in a discontinuous shape, an annular portion is attached to the periphery of the first rupturable member in order to suppress gas leakage from between the first rupturable member and the first rupturable member. The peripheral portion is welded and fixed to the side surface of the protruding portion, and the annular portion is also fixed to the inner peripheral surface of the cylindrical housing by welding.

  By the first rupture member, the space filled with the pressurized gas (pressurized gas storage space) before the operation of the gas generator and the ignition unit storage space for storing the ignition means and the gas generating agent are independent of each other. It is formed as a space that does not communicate. The ignition means accommodation space and the pressurized gas accommodation space are formed by the same seamless cylindrical housing, so that the number of parts is reduced and the structure is simple. That is, a member forming the pressurized gas storage space and the ignition means storage space is formed by a single cylindrical housing, a projection is formed at the boundary between the two storage spaces, and the first partition member is partitioned. Become.

  The gas discharge port is formed on the pressurized gas storage space side. That is, since it is formed on the opposite side to the ignition means accommodation chamber with respect to the cylindrical housing, the gas flows in one direction including the combustion gas from the solid gas generating agent. In addition, since an electric igniter is generally used as the ignition means, a lead wire for sending an ignition current to the electric igniter is disposed on the side opposite to the gas discharge port, and the personnel attached to the discharge port Attachment is facilitated without interfering with a restraining device (for example, an airbag). This gas outlet is closed before the gas generator is activated.

  In the gas generator of the present invention, the gas discharge port is formed at an end of the cylindrical housing opposite to the ignition means accommodating space, and a peripheral wall portion of the cylindrical housing is projected radially inward. The structure is preferably formed and closed with the second rupturable member.

  That is, on the gas discharge port side, similarly to the fixing method of the first rupturable member, the shape is projected on the inner side of the housing, and the second rupturable member is attached to the projected portion. As described above, the protrusion for attaching the second rupturable member is annular by projecting a part of the cylindrical housing (that is, the end of the housing on the side where the gas discharge port is formed, or the vicinity thereof) inward by a press or the like. In addition to the (continuous or discontinuous) protrusion, there is one in which the opening end on the gas discharge port side of the cylindrical housing is bent inward so that the opening end becomes an inward flange. Then, the second rupturable member is attached to the protrusion or the flange portion. As a result, the second rupturable member can be easily fixed, so that the assembly process and the internal structure can be simplified.

  Furthermore, the present invention provides a cylindrical housing having one end closed, an opening on the other end side, and filled with pressurized gas therein, and seamless in the axial direction from one end to the other end, and the cylindrical housing A gas generator for a vehicle personnel restraint device having an ignition means disposed therein, and is disposed radially inward of an inner wall surface of the cylindrical housing at any portion between both axial ends of the cylindrical housing. A first rupture member is attached to the protrusion, the housing is divided into two spaces in the axial direction, and a pressurized gas storage space for storing the pressurized gas and an ignition means are stored. Provided is a gas generator for a vehicle personnel restraint device, wherein the gas discharge port is formed in the ignition means accommodation space and is isolated in the ignition means accommodation space.

  That is, the gas generator of the present invention is a gas generator using only pressurized gas (pressurized gas type gas generator), and the first rupturable member enclosing the pressurized gas in the cylindrical housing is formed by the ignition means. It is cleaved to generate gas. One end of the cylindrical housing may be closed using another member or may be processed to close from the open state using Mannesmann processing or the like.

  As the pressurized gas, an inert gas such as argon, helium or neon, a simple substance such as nitrogen gas, or a mixture thereof can be used, and this gas is filled in the pressurized gas storage space. Further, an igniter that is ignited by an operating current is disposed in the ignition means accommodating space, and both spaces are isolated by the first rupture member. Therefore, the pressurized gas storage space and the ignition means storage space are adjacent to each other in the axial direction of the cylindrical housing via the first rupturable member, and the two spaces are not in communication before the operation of the gas generator.

  In this gas generator, the first rupturable member is supported and fixed by a protrusion formed on the cylindrical housing. The protruding portion refers to a portion where the inner diameter of the cylindrical housing is reduced, and is preferably formed integrally with the cylindrical housing. For example, it is preferable to form the peripheral wall portion of the cylindrical housing by deforming it with a press or the like and projecting it inward in the radial direction. As a result, the protrusion can be easily formed by a press or the like, and the assembly process is simplified. Further, since the shape of the part itself can be simplified, the structure of the gas generator can be simplified.

  The protrusion may be any protrusion that can support and fix the first rupturable member, and may be two or more separate and independent protrusions in addition to the protrusion continuous in the circumferential direction (annular protrusion). From the viewpoint of contact or sealing of pressurized gas, a continuous annular protrusion is preferable. In addition, when forming a protrusion part in a discontinuous shape, in order to suppress the leakage of gas from between the first rupture members, an annular part is attached to the periphery of the first rupture member, and the periphery is a protrusion. The annular portion is welded and fixed to the inner peripheral surface of the cylindrical housing.

  By the first rupture member, the space filled with the pressurized gas (pressurized gas accommodating space) before the gas generator is activated and the ignition means accommodating space for accommodating the igniting means are independent and do not communicate with each other. It is formed. The ignition means accommodation space and the pressurized gas accommodation space are formed by the same seamless cylindrical housing, so that the number of parts is reduced and the structure is simple. That is, a member forming the pressurized gas storage space and the ignition means storage space is formed by a single cylindrical housing, a projection is formed at the boundary between the two storage spaces, and the first partition member is partitioned. Become.

  The igniter has an operation part containing an igniting agent, and the shock wave, pressure, heat, etc. from the igniter are directly applied to the first rupture member by disposing the operation part toward the first rupture member. I can do it. Alternatively, the first rupturable member can be cleaved by acting indirectly. The term “indirectly” refers to an object that is driven by a product such as a flying object by a product (shock wave, pressure, heat, etc.) from an igniter and is cleaved against the first rupture member. .

  In the gas generator of the above invention, it is preferable that the protrusion is formed continuously in a circumferential direction of the cylindrical housing.

  As the protruding portion, any part in the axial direction between both end portions of the housing is pressed by a method such as pressing a part inside the housing to narrow the inner diameter, or in the axial direction between both end portions of the housing. With such a portion as a boundary, a discontinuous portion of the inner diameter can be formed by projecting or expanding the inside of the housing by a method such as pressing. Then, the first rupturable member is attached directly or indirectly to the portion whose inner diameter is narrowed.

  Further, since the protrusions are continuously formed in the circumferential direction, it is difficult to form a gap between the first rupturable member and the housing (or the protrusion), and the pressurized gas containing space can be reliably sealed. I can do it.

  Furthermore, in the gas generator of the present invention, it is preferable that the protruding portion is formed by protruding a part of the cylindrical housing peripheral wall portion in an annular shape radially inward.

  Since processing is applied to only a part of the housing, the housing can be easily formed.

  Furthermore, in the gas generator of the present invention, it is preferable that the first rupturable member has a structure that is directly attached to the protrusion by resistance welding.

  When fixing the first rupturable member to the protrusion, there is a method in which the first rupturable member is temporarily fixed to the ring-shaped annular member, and then the annular member is attached to the protrusion. This is preferable because the members can be eliminated and the assembly process and the number of parts can be reduced.

  When the first rupturable member is directly fixed to the protrusion, a known welding method (for example, resistance welding, laser welding, etc.) can be used.

  The gas generator for personnel restraint device of the present invention is a gas generator having means for supporting and fixing the first rupturable member that separates the inside of the cylindrical housing into a plurality of spaces. Support fixing means can be formed. For this reason, the structure is simplified and the number of parts is reduced, so that the assembly is easy and the assembly process can be simplified.

(1) First Embodiment A gas generator of the present invention will be described with reference to FIG. FIG. 1 is a sectional view of the hybrid gas generator 10 in the axial direction.

  A diffuser portion 20 having a plurality of gas outlets 21 is welded and fixed to one end side opening of the cylindrical housing 11 having a shape where both ends of the joint are open, and an igniter 23 is connected to the other end side opening. The attached closure 22 is fixed by welding. The closure 22 also serves as a collar for fixing the igniter 23.

  In the peripheral wall portion 18 of the cylindrical housing 11, a protruding portion 13 is formed at the intermediate portion in the axial direction between the both end portions. The protrusion 13 is obtained by continuously reducing the diameter of the peripheral wall 18 in the circumferential direction. For example, the protrusion 13 is formed by deforming the peripheral wall 18 of the cylindrical housing 11 from outside to inside by pressing. And the 1st rupturable plate 16 is being fixed by welding so that it may contact | abut to the side surface 15 of this projection part 13. As shown in FIG. At this time, welding is performed so that no gap is formed between the side surface 15 of the protrusion 13 and the first rupturable plate 16. Resistance welding can be used as the welding. Thereby, the inside of the cylindrical housing 11 is separated into two spaces (the combustion chamber 34 and the pressurized gas chamber 14).

  In the state in which the protruding portion 13 is formed on the cylindrical housing 11, since both end portions of the housing are open, the first rupturable plate 16 has the side of the protruding portion 13 on the combustion chamber 34 side or the pressurized gas chamber 14 side. Can be attached to either. In FIG. 1, it is attached to the combustion chamber 34 side.

  The combustion chamber is filled with a plurality of granular gas generating agents 35, which are ignited and burned by combustion products (flame, high temperature gas, etc.) generated by the operation of the igniter 23. When the gas generating agent 35 burns, a flame, a high temperature gas and the like are generated.

  As the gas generating agent, for example, a material containing a fuel and an oxidant, a fuel, an oxidant and a slag forming agent, mixed with a binder as necessary, and molded into a desired shape can be used. When such a gas generating agent is used, the gas generated by the combustion can be used for inflation and deployment of the airbag together with the pressurized gas. In particular, when a gas generating agent containing a slag forming agent is used, it becomes easier to form slag, so that the amount of mist-like combustion residue discharged from the gas generator can be greatly reduced. In particular, when a gas generating agent is used, the combustion residue is exhausted to the outside of the housing by using a combustion residue whose melting point is higher than the discharge temperature of the gas generated from the gas generating agent. It becomes difficult and preferable.

  As fuel, guanidine derivatives such as nitroguanidine (NQ), guanidine nitrate (GN), guanidine carbonate, aminonitroguanidine, aminoguanidine nitrate, aminoguanidine carbonate, diaminoguanidine nitrate, diaminoguanidine carbonate, triaminoguanidine nitrate 1 or 2 or more selected from etc. is preferable. As the fuel, one or two or more selected from tetrazole and tetrazole derivatives can be used.

  The oxidizing agent is preferably one or more selected from strontium nitrate, potassium nitrate, ammonium nitrate, potassium perchlorate, copper oxide, iron oxide, basic copper nitrate, and the like.

  The slag forming agent is preferably one or more selected from acidic clay, talc, bentonite, diatomaceous earth, kaolin, silica, alumina, sodium silicate, silicon nitride, silicon carbide, hydrotalcite, and mixtures thereof.

  As the binder, one or more selected from sodium salt of carboxymethyl cellulose, hydroxyethyl cellulose, starch, polyvinyl alcohol, guar gum, microcrystalline cellulose, polyacrylamide, calcium stearate and the like are preferable.

  As a specific composition of the gas generating agent, a fuel containing 20 to 60% by mass of nitroguanidine and 80 to 40% by mass of an oxidizing agent can be used, and 30 to 40% by weight of nitroguanidine as a fuel. The oxidant preferably contains 70 to 60% by weight of strontium nitrate. Further, in addition to the fuel and the oxidant, a binder (such as sodium carboxymethyl cellulose) and a slag former (such as acid clay) can be blended. In that case, the fuel is 20 to 60% by weight, and the oxidant is 40 to 65. % By weight, 3-12% by weight binder (preferably 4-12% by weight) and 1-20% by weight slag former (preferably 3-7% by weight) are preferred.

  The diffuser 20 has a cup shape, and gas outlets 21 are formed at equal intervals on the peripheral wall portion. A second rupturable plate 25 is attached to the opening 24 of the diffuser 20. Further, the flange 26 extends toward the outside of the opening 24. The opposite end (right side in FIG. 1) of the cylindrical housing 11 is open, and the flange 26 is fixed by a method such as welding so as to close the opening 29. The space (pressurized gas chamber) 14 closed by the first rupturable plate 16 and the second rupturable plate 25 is filled with pressurized gas.

  The pressurized gas is made of an inert gas such as argon or helium (in the present invention, nitrogen is also included in the inert gas). The filling pressure of the pressurized gas is preferably 10,000 to 80,000 kPa, more preferably 30,000 to 60,000 kPa.

  In FIG. 1, reference numeral 37 denotes a filling hole for filling the pressurized gas chamber 14 with gas, and 36 denotes a seal pin for closing the filling hole 37 after filling with gas. The gas is filled after the diffuser 20 to which the second rupturable plate 25 is attached and the first rupturable plate 16 are attached.

  Next, the operation when the gas generator 10 of FIG. 1 is incorporated in an automobile airbag system will be briefly described.

  When the automobile collides, the igniter 23 is operated to ignite and burn the gas generating agent 35 in the combustion chamber 34 to generate high-temperature gas. The hot gas raises the pressure inside the combustion chamber 34, and when the pressure exceeds a predetermined pressure, the first rupturable plate 16 is cleaved. Next, the combustion gas, together with the pressurized gas filled in the space 14, raises the pressure in the space 14 and the combustion chamber 34, and destroys the second rupturable plate 25. The pressurized gas and the combustion gas from the gas generating agent 35 are ejected from the gas outlet 21 to inflate the airbag.

(2) Second Embodiment Another embodiment of the present invention will be described with reference to FIG. The gas generator shown in FIG. 2 is basically the same as the gas generator shown in FIG. 1, and the diffuser 20 shown in FIG. 1 is different. Therefore, only different portions will be described, and description of portions common to the structure in FIG. 1 will be omitted.

  The gas generator 110 in FIG. 2 uses a seamless cylindrical housing 11 with both ends open, similar to the housing 11 in FIG. 1, and a closure 22 having an igniter 23 attached to one end thereof is closed. However, the opposite end (on the right side in FIG. 2) is open. A second protrusion 113 that is the same as the protrusion 13 formed to hold the first rupturable plate 16 in the embodiment of FIG. 1 is formed in a portion slightly inside the open end. A second rupturable plate 25 is attached to the side surface of the second protrusion 113. The second rupturable plate 25 is inserted and fixed inside the housing from the open end of the opposite end of the cylindrical housing 11 (right side as viewed in FIG. 2, opposite to the igniter 23). The generated gas flows in the axial direction of the housing with the end of the second rupturable plate side 25 of the cylindrical housing 11 open. As in FIG. 1, the diffuser 20 in FIG. 1 can be attached to the opposite end.

(3) Third Embodiment A third embodiment will be described with reference to FIG. The gas generator 210 in FIG. 3 is different from the gas generator 10 in FIG. 1 in the structure around the diffuser 20 and the structure around the first rupturable plate 16, and the other structures are the same. Therefore, the same parts are denoted by the same reference numerals as those in FIG.

  In the gas generator 210 of FIG. 3, the first rupturable plate 16 is indirectly fixed to the protrusion 13 formed on the peripheral wall 18. That is, the first rupturable plate 16 is once attached to the ring-shaped holding member 216 by welding or the like, and then the holding member 216 is fixed to the side surface 15 of the protruding portion 13 by welding or the like. As in the case of FIG. 1, when attaching the holding member 216, one end opening of the cylindrical housing 11 (on the left side in FIG. 3, the igniter 23 side) with the first rupturable plate 16 attached to the holding member 216. ) And contact with the side surface 15 of the projection 13 to fix by welding. In particular, when the combustion performance of the gas generating agent is affected by pressure, the opening area can be adjusted by the central hole 217 of the holding member 216.

  The first rupturable plate 16 and the holding member 216 may be formed integrally.

  On the other hand, the opposite end of the cylindrical housing 11 (on the right side in FIG. 3, that is, on the side opposite to the igniter 23) is formed with an inward flange 28, thereby forming a gas discharge port 229. Has been. The gas discharge port 229 is closed by a second rupturable plate 25 attached from the inside of the opposite end of the cylindrical housing 11.

Further, a diffuser 20 is attached to the end portion. As in FIG. 1, the diffuser 20 has a cup shape, and the gas outlets 21 are formed at equal intervals on the peripheral wall portion. Further, the opening 24 is fixed to the inward flange 28 by a method such as welding. The space (pressurized gas chamber) 14 closed by the first rupturable plate 16 and the second rupturable plate 25 is filled with pressurized gas. (4) Fourth embodiment Further another embodiment of the present invention An example will be described with reference to FIG. The gas generator 310 shown in FIG. 4 is different from the gas generator shown in FIG. 1 in the formation of protrusions for supporting and fixing the first rupturable plate and the method of fixing the igniter 23 (or collar 22) to the housing 11. It is what.

  In FIG. 1, the housing basically has the same diameter except for the protruding portion 13. However, in the structure shown in FIG. 4, the housing diameter (inner diameter) of the portion forming the ignition means accommodation space 34 is the pressurized medium accommodation space. 14 is smaller than the portion forming 14. Thereby, the reduced diameter portion 313 is formed, and the first rupturable plate 16 is fixed to the side surface portion 315 by welding. The diameter-reduced portion 313 is formed by processing a portion corresponding to the ignition means collection space 34 of the cylindrical housing by pressing or the like, and also performing processing to increase the diameter corresponding to the pressurized medium accommodation space 14. Can be formed.

  The first rupturable plate 16 may be temporarily fixed to the holding member and welded to the reduced diameter portion 313 as in the embodiment of FIG. 3, and the holding member and the first rupturable plate are integrally formed. Then, it may be fixed to the reduced diameter portion 313 by welding.

  On the other hand, for fixing the igniter 23, a stepped portion 30 is formed so that the peripheral edge of the collar 22 abuts, and the igniter collar 22 is fitted to the opening end (left side in the drawing) of the cylindrical housing. The part 31 can be fixed by caulking.

(5) Fifth Embodiment Still another embodiment of the present invention will be described with reference to FIG. Unlike FIG. 1 to FIG. 4, the gas generator 410 shown in FIG. 5 is a cross-sectional view showing a gas generator using only pressurized gas.

  The cylindrical housing of the gas generator 410 has a cylindrical shape with both ends opened, and one end (right side in FIG. 5) is deformed and closed by Mannesmann processing or the like. Alternatively, a separate disk-shaped closing member can be fixed by welding or the like in the open state.

  The opposite end (left side as viewed in FIG. 5) of the cylindrical housing 11 is in an open state, and a protruding portion 13 continuous in the circumferential direction is formed at a portion slightly deviated from the axial center between both ends of the cylindrical housing 11. Is formed. The protrusion 13 is formed by continuously reducing the diameter of the peripheral wall 18 in the circumferential direction, like the gas generator 10 of FIG. 1, and is formed by deforming the peripheral wall 18 of the cylindrical housing 11 by pressing. It is. A rupturable plate 416 is fixed by welding so as to abut against the side surface of the protrusion 13. At this time, welding is performed so that no gap is formed between the side surface of the protrusion 13 and the first rupturable plate. Thereby, the pressurized gas chamber 14 is formed inside the cylindrical housing 11.

  On the other hand, an igniter 23 fixed to the igniter collar 22 is attached to the opposite end (left side in FIG. 5) of the cylindrical housing 11. In the igniter, an operating portion 423 in which an igniting agent is stored is disposed so as to face the rupturable plate 416. In the state where the igniter 23 is attached, an ignition means accommodation chamber 434 is formed at the opposite end (left side in FIG. 5) of the cylindrical housing 11. Unlike the gas generator of FIGS. 1 to 4, there is no gas generating agent in the ignition means accommodation chamber 434.

  Further, a gas discharge port 421 is formed in a portion corresponding to the ignition means accommodation chamber 434 in the peripheral wall portion 18 of the cylindrical housing 11. The gas outlets 421 are formed at equal intervals on the peripheral wall portion 18.

  When assembling the gas generator 410 of FIG. 5, one end portion (right side in FIG. 5) of the cylindrical housing 11 is closed with the above-described processing method and another member, and then a projection is formed on the peripheral wall portion 18 by pressing. 13 is formed. Further, the rupturable plate 416 is inserted from the open end of the opposite end of the cylindrical housing (left side in FIG. 5), and is fixed to the side surface of the protrusion 13 by welding. After that, the pressurized gas is filled from the gas filling hole 37 until a predetermined pressure is reached, and the sealing pin 36 closes it. In this state, the collar 22 to which the igniter 23 is attached is fixed to the opposite end (left side as viewed in FIG. 5) of the cylindrical housing 11.

  Next, the operation when the gas generator 410 of FIG. 5 is incorporated in an automobile airbag system will be briefly described.

  When the automobile collides, the igniter 23 is activated, and combustion products (hot gas, shock waves, flames, etc.) are generated from the operating part 423. This acts on the rupturable plate 416 and cleaves the rupturable plate 416. Then, the pressurized gas accumulated in the pressurized gas chamber 14 flows into the ignition means accommodating chamber 434 and then flows into the airbag connected from the gas outlet 421.

  According to the gas generator of the present invention, the first rupturable plate (16 in FIGS. 1 to 4), the second rupturable plate (25 in FIGS. 2 to 4), and the rupturable plate (416 in FIG. 5) In addition to being able to be fixed easily, the shape of the component for fixing is simplified, and processing for that is facilitated.

1 is a cross-sectional view of a hybrid gas generator according to one embodiment of the present invention. Sectional drawing of the hybrid type gas generator of another Example of this invention. Sectional drawing of the hybrid type gas generator of another Example of this invention. Sectional drawing of the hybrid type gas generator of another Example of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing of the pressurized gas type gas generator of one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Cylindrical housing 13 Protrusion part 16 1st rupturable plate 20 Diffuser 21 Gas outlet 23 Igniter 25 2nd rupturable plate

Claims (6)

A cylindrical housing having a closed gas discharge port, filled with pressurized gas inside, and seamless in the axial direction from one end to the other;
Ignition means disposed inside the cylindrical housing;
A gas generator for restraining personnel of a vehicle, comprising a gas generating agent ignited and burned by the ignition means;
A protruding portion facing radially inward is formed on the inner wall surface of the cylindrical housing at any part between both axial ends of the cylindrical housing, and the first rupturable member is attached to the protruding portion, and the housing is pivoted. Divided into two spaces in the direction, separated into a pressurized gas storage space for storing the pressurized gas, an ignition means and an ignition means storage space for storing the gas generating agent,
The gas discharge port is a gas generator for a vehicle personnel restraint device formed in a pressurized gas storage space.   The gas discharge port is formed at the end of the cylindrical housing opposite to the ignition means accommodating space, is formed by projecting the peripheral wall portion of the cylindrical housing radially inward, and is closed by a second rupture member The gas generator for a personnel restraint device according to claim 1. A cylindrical housing that is closed at one end, has an opening at the other end, and is filled with pressurized gas inside, and is seamless in the axial direction from one end to the other;
A gas generator for a vehicle personnel restraining device, comprising ignition means disposed inside the cylindrical housing;
A protruding portion directed radially inward is formed on the inner wall surface of the cylindrical housing at any portion between the axial end portions of the cylindrical housing, and the first rupturable member is attached to the protruding portion, and the housing is pivoted. Divided into two spaces in the direction, separated into a pressurized gas storage space for storing pressurized gas and an ignition means storage space for storing ignition means,
A gas generator for a vehicle personnel restraint device in which a gas discharge port is formed in an ignition means accommodating space in a cylindrical housing and is closed by the first rupturable member.   The gas generator for a person restraining device according to any one of claims 1 to 3, wherein the protrusion is formed continuously in a circumferential direction of the cylindrical housing.   5. The gas generator for a person restraining apparatus according to claim 1, wherein the protruding portion is formed by protruding a part of the axial direction of the peripheral wall portion of the cylindrical housing in an annular shape radially inward. The gas generator for a personnel restraint device according to any one of claims 1 to 5, wherein the first rupturable member is directly attached to the protrusion by welding.

Images