JP2001088653A - Gas generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas generator capable of preventing drive agent from entering into a blind space, easily and surely fixing the assembly, easily securing a prescribed filling rate of the drive agent, and preventing a fractured piece from falling off by a combustion gas pressure. SOLUTION: This gas generator is provided with an opening 31 for passing flames from an igniter 10 in the bottom face, a bottomed cylindrical holder 30 arranged as covering the outer circumference of a header part 11 of the igniter and an inflating part 12, a bottomed cylindrical cup 20 having an internal circumferential side face overlapped with the outer circumferential side face of the holder and having a closing part in the bottom face, and drive agent stored in the cup; and is so formed that the igniter is pinched between the holder and the body via the inflating part by stacking the opening end of the holder with the opening end of the cup to the body 40, and fixing them by calking, the outer circumferential side face of the holder and the internal circumferential side face of the cup are closely stuck without any clearance, and the drive agent storage part is formed between the opening part side of the holder and the closing part of the cup.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric small gas generator mainly used for a gas generator for a seat belt pretensioner.

[0002]

2. Description of the Related Art A seatbelt pretensioner plays a role of safely restraining a passenger (seatbelt wearer) with a seatbelt when receiving an abnormal impact such as a vehicle collision. A gas generator (gas generator) used in the seat belt pretensioner is provided with a driving agent (gas generator) accommodated in the gas generator in order to quickly and surely pull and fix the seat belt in the event of an impact such as a vehicle collision. It is important how quickly and reliably the combustion gas for igniting the gas generating agent and driving the seat belt is generated.

[0003] Therefore, the gas generator receives an electric signal of an electric sensor of the collision detection system, first converts an electric energy into a heat energy to cause an ignition reaction from a heat generating portion, and an igniter (squib or initiator);
The igniter is composed of components such as a body that holds the igniter in combination with the igniter and a cup that contains a driving agent that ignites by receiving a firing reaction of the igniter and generates combustion gas.

Thus, the pressure of the combustion gas of the driving agent contained in the cup of the gas generator drives the winding device incorporated in the seat belt pretensioner, and the seat belt suspended on the winding device is wound. And restrained the body safely. Further, this gas generator is used for a seat belt pretensioner, but can also be used for igniting a gas generating agent of a gas generator for an air bag as another application.

Japanese Patent Application Laid-Open No. Hei 10-217900 discloses a gas generator (gas generator) in which an igniter (igniter main body) is fixed to a body via an O-ring. This gas generator is an igniter (igniter body 5)
Is placed on a seal 6 of an O-ring placed at the bottom of the neck 4 formed on the body (igniter support 2), and one side (free end) of the neck 4 is enlarged in the central portion of the igniter. By caulking, it is fastened and fixed to the body.

Further, the body (igniter support 2)
In the vicinity of the neck 4 of the body, a circumferential groove (rim lip 3) is formed in the circumferential direction.
2) is formed. Then, a flange portion of a cup (breakable case 13) accommodating the driving agent (ignition powder 14) is placed in the edge groove portion, and the edge groove portion is caulked so as to be bent inward. Further, Japanese Patent Application Laid-Open No. 4-270988 discloses a gas generator having a configuration in which an O-ring seal is not used.

In this gas generator, a driving agent (ignition charge 44) is accommodated in a cup (container 42), and a sheet 46 that covers the driving agent and separates the inside of the cup from the igniter.
Has been arranged. A disk-shaped plate 48 is provided on the connector side of the igniter (ignition member 50), and a flange portion (ring flange 36) of a cup (container 42) is provided thereon.
Is placed and welded to the plate.
The flange portion (ring flange 56) of the cup-shaped distribution casing 52 is superposed and placed on the body (holding body 62).
And the ridged pin 68 for fastening.

Japanese Patent Application Laid-Open No. 61-41647 discloses a gas generator having a body forming an igniter receiving portion for holding a connector portion of an igniter and holding a flange portion of a cup containing a driving agent. ing. In this gas generator, the body (igniter carrier 4) has an igniter receiving portion (igniter carrier portion 26) protruding in the axial direction, an expanded central portion (expanded central collar 28), and a central portion. An annular edge groove (annular groove 3)
0) is formed, and a driving agent (propellant 5)
4) The flange portion (container edge) of the cup (propellant container 10) accommodating therein is inserted, and is caulked and fixed together with the O-ring by the caulking portion (lip 32).

Japanese Patent Application Laid-Open No. Hei 8-183418 discloses that a flame of an igniter charges from a fragile portion of a breakable tubular member due to a gas pressure generated when an igniter is operated upon receiving an electric signal from an electric sensor. An igniter for a gas generator for a discharged airbag is disclosed. The igniter of the gas generator for an air bag includes an igniter (a squib enhancer 14) that integrally forms a squib (igniter) and an enhancer (a transfer charge), and a cup (breakage) that can be broken by covering the igniter. Possible tubular component 12)
And a flange 19 is formed on the cup, and the flange is placed on a collar 15 integrally formed with the squib enhancer and fixed together with an O-ring by a caulking portion.

The closed end 20 of the cup 12 is provided with a break (fragile). This break part makes the closed end relatively thin, for example, this thickness is 0.1 to 0.5.
mm.

[0011]

A gas generator, particularly a gas generator (gas generator) for a seat belt pretensioner, has a structure in which a vehicle occupant's body is held by a belt.
The place where the pretensioner (device) is accommodated is also limited, and the structure and mounting method of the pretensioner (device) differ depending on the maker.

Therefore, in the gas generator described in Japanese Patent Application Laid-Open No. 10-217900, in the cup, the driving agent contained in the cup is close to the constriction on the heat-generating portion side of the igniter (the space between the outer diameter of the igniter header and the inner diameter of the cup). : The blind space) or the amount of the driving agent that enters the blind space varies depending on the installation direction of the gas generator, and there is a possibility that the pressure characteristics during combustion of the driving agent change.

When the driving agent enters the blind space, a powder ignition agent mixed with the driving agent and ignited by receiving a flame from the igniter (a granular propellant mixed by the flame of the powder ignition agent is used). Ignition at almost the same time), but the ignition tends to be delayed later than the ignition agent on the upper surface of the igniter header, which has a considerable influence on the pressure characteristics.

This phenomenon occurs because the driving agent located in the blind space does not receive the flame propagation of the powdery ignition agent,
The combustion starts after a delay due to the flame propagation of the normally ignited igniting agent, which is caused by a delay or decrease in pressure. Also, in order to fix the igniter, it is caulked and fixed by a neck and an O-ring extending from the body in a hollow cylindrical shape, and the flange portion of the cup containing the driving agent is placed on the annular edge groove of the body, and Two staking processes of caulking and fixing are required.

Further, in the gas generator described in Japanese Patent Application Laid-Open No. Hei 4-270989, in order to hold the ignition charge 44 and to prevent moisture,
The priming of the press body in the cup must be covered by a sheet 46.

Further, in order to hold the cup and the igniter, it is necessary to use the plate 48 or fix it with screws, which requires a lot of man-hours. Also, Japanese Patent Application Laid-Open No. 61-416
In the gas generator described in Japanese Patent No. 47, the body is held in the shape of a step (tapered shape) on the connector side of the igniter, so that an O-ring is required, and the igniter itself is held on the driving agent side. Has difficulties.

In the igniter of the gas generator for an air bag described in Japanese Patent Application Laid-Open No. 8-183418, a thin cut portion is formed at the closed end 20 of the cup. There is a possibility that the broken fragments may come off. The output required for the seat belt pretensioner is not constant, and the required pressure varies depending on the type of vehicle, the type of module, and the like.

Therefore, the gas generator maker needs to cope with various required outputs, and in some cases, adjusts the amount of the driving agent. Even if the thermodynamic energy required by the pretensioner is constant, there are modules that require a fast rising pressure and vice versa. It is necessary to respond by the ratio of gunpowder. The driving agent is usually composed of a propellant and an igniting agent.

When a fast rising pressure is required, it is necessary to add a large amount of igniting agent, but since the igniting agent has a smaller gas amount than the propellant, the amount of the propellant cannot be reduced so much. Therefore, the amount of medicine and the filling volume of the entire driving medicine change. For the above reasons, a plurality of specifications must be prepared when meeting customer requirements.

Therefore, in the conventional type having no filling rate adjusting structure, a plurality of cups had to be prepared in order to make an optimum filling rate. The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a gas generator in which a driving agent is prevented from entering a blind space.

It is another object of the present invention to provide a gas generator which can be easily assembled and securely fixed. Still another object of the present invention is to provide a gas generator which can easily secure a predetermined filling rate of a driving agent. Still another object of the present invention is to provide a gas generator in which broken fragments are not released by the combustion gas pressure.

[0022]

The invention according to claim 1 is
An igniter having a header portion and a connector portion, wherein the header portion and the connector portion are connected via a bulge portion, and a body disposed in contact with the bulge portion of the igniter on the connector side. A bottomed tubular holder having an opening at the bottom surface through which the flame from the igniter passes and arranged to cover the outer periphery of the header portion and the bulging portion of the igniter; A bottomed cylindrical cup having a peripheral side surface and having a closed portion on a bottom surface, and a driving agent accommodated in the cup, wherein an opening end of the holder and an opening end of the cup are formed in the body. The igniter is sandwiched between the holder and the body via the bulging portion, and the outer peripheral side surface of the holder and the inner peripheral side surface of the cup are Coherent so as not between, between the closure of the cup and the opening side of the holder, characterized in that by forming a driving agent accommodating unit.

According to a second aspect of the present invention, in the gas generator according to the first aspect, the body includes an igniter receiving portion having a wall surface in surface contact with a wall surface on the connector side of the bulging portion of the igniter; An annular edge groove having an edge capable of fixing by caulking and fixing a flange provided outside the open end of the holder and a flange provided outside the open end of the cup is integrally formed. It is characterized by comprising.

According to a third aspect of the present invention, in the gas generator according to the second aspect, a silicone sealant is applied to a flange portion of a flange portion provided outside the opening end of the holder. It is characterized by. According to a fourth aspect of the present invention, in the gas generator according to the second aspect, a silicone sealant is applied to an igniter receiving portion of the body.

According to a fifth aspect of the present invention, in the gas generator according to the first aspect, the driving agent accommodating portion reduces the filling ratio of the driving agent to 80% by replacing the holder.
９０90%. The invention according to claim 6 provides an igniter having a header portion and a connector portion, a body attached to the connector portion side of the igniter, a closing portion on the bottom surface, a rupture line provided on the bottom surface, and attachment to the igniter. And a driving agent contained in the cup.

According to a seventh aspect of the present invention, in the gas generator according to the sixth aspect, the rupture line forms a remaining plate thickness of 30% to 50% with respect to the plate thickness of the bottom surface. . The invention according to claim 8, comprising: an igniter having a header portion and a connector portion and having a rupture line in the header portion; a body attached to the connector portion side of the igniter; And a driving agent contained in the cup.

According to a ninth aspect of the present invention, in the gas generator according to the eighth aspect, the rupture line forms a remaining plate thickness of 30% to 50% with respect to the plate thickness of the bottom surface. . An invention according to claim 10 is an igniter having a header portion and a connector portion, wherein the header portion and the connector portion are connected to each other via a bulging portion, and an igniter having a bulging portion on the connector side. It is characterized by comprising a body disposed in contact with the container, a bottomed cylindrical cup having a closed portion on the bottom surface, attached to the igniter, and a driving agent accommodated in the cup.

The invention according to claim 11 is an igniter having a header portion and a connector portion and having a rupture line in the header portion, a body attached to the connector portion side of the igniter, and a closing portion on the bottom surface. A burst line is provided on the bottom surface, and a bottomed cylindrical cup attached to the igniter and a driving agent accommodated in the cup are provided.

According to a twelfth aspect of the present invention, there is provided an igniter having a header portion and a connector portion, wherein the header portion and the connector portion are connected via a bulge portion, and an igniter attached to the connector portion side of the igniter. Body and
It is characterized in that it has a closed part on the bottom surface, a rupture line on the bottom surface, a bottomed cylindrical cup attached to the igniter, and a driving agent contained in the cup.

According to a thirteenth aspect of the present invention, there is provided an igniter having a header portion and a connector portion and provided with a rupture line in the header portion, a body attached to the connector portion side of the igniter, and a flame from the igniter. A bottomed tubular holder having an opening at the bottom surface and disposed to cover the outer periphery of the header portion and the bulging portion of the igniter, and a bottomed tube having a closed portion at the bottom surface and attached to the igniter And a driving agent accommodated in the cup.

According to a fourteenth aspect of the present invention, in the gas generator according to the thirteenth aspect, the opening of the holder is constituted by a hole which is reduced in diameter toward the cup. The invention according to claim 15 is the invention according to claim 13
In the gas generator described above, the rupture line is arranged so that a peripheral portion thereof is covered with a bottom portion of the holder and a central portion thereof is exposed from the opening.

According to a sixteenth aspect of the present invention, in the gas generator according to the thirteenth aspect, the holder is fixed to the body together with the cup by swaging. An invention according to claim 17 is an igniter having a header portion and a connector portion and having a rupture line in the header portion, a body attached to the connector portion side of the igniter, and an opening through which a flame from the igniter passes. A bottomed cylindrical holder having a bottom surface and disposed so as to cover the outer periphery of the header portion of the igniter,
It is characterized in that it has a closed-end portion on the bottom surface, a bottomed cylindrical cup attached to the igniter, and a driving agent contained in the cup.

[0033]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall view of a gas generator according to the present embodiment (corresponding to claims 1 to 16). The gas generator 1 according to the present embodiment has an igniter 10 as an initial ignition means, a cup 20 containing a driving agent 50, and is disposed inside the cup 20 and fitted to the header 11 side of the igniter 10. The holder 30, a body 40 for receiving and holding the connector 13 side of the igniter 10, and an annular edge groove 42 of the body 40 are provided with a flange 34 of the holder 30 and a flange 23 of the cup 20.
Are overlapped and inserted, and caulked and fixed by the edge 43 of the annular edge groove 42.

As shown in FIG. 2, the igniter 10 has two lead pins 15 molded with a resin plug 14,
16, a heating portion 17 such as a bridge wire electrically connected to one side thereof, an ignition charge 18 charged on the heating portion 17, and a resin plug 14 for accommodating the ignition charge 18. The resin plug 14 is placed on the step 14a of the
And a cap 19 to be fitted and fixed.

The outer shape of the igniter 10 is such that the header 1 having the heat generating portion 17 and the ignition
1 and a connector portion 1 electrically connected to the header portion 11
3 are connected.

The bulging portion 12 is tapered toward the header portion 11 and the connector portion 13.
a and 12b. As shown in FIGS. 1 to 7, the cup 20 is a bottomed cylindrical body made of an aluminum alloy and having a closed portion 21 on a bottom surface closed on one side and an open end 22 open on the other side.

A flange portion 23 is formed on the outer periphery of the open end portion 22 so as to be turned by approximately 90 degrees. Further, as shown in FIGS. 3 to 6, the body 20
Chamfered portion 25 narrower than body portion 24 on the closing portion 21 side
Are provided facing each other. Further, a break portion 26 is formed in the closing portion 21. As shown in FIG. 6, the broken portion 26 has a length of 60 to 70% of the inner diameter of the bottom surface and a remaining thickness of 50% of the inner thickness of the bottom surface radially from the central axis of the cup 20 toward the circumferential direction. Rupture line (tear line) 26a to 8
Book is provided.

The number of the rupture lines (tear lines) 26a is eight in the present embodiment, but preferably six to eight lines are suitable from the viewpoint of preventing separation of the fragments. Furthermore, the remaining plate thickness of the rupture line (tear line) 26a is 0.3 mm in this embodiment.
However, from the viewpoint of strength, preferably 0.2 to 0.3 mm
Is appropriate (the thickness of the rupture line (the tear line) is 30 to 50% of the thickness of the closed face).

As shown in FIGS. 1, 2, and 8, the holder 30 has an opening 3 through which the flame of the igniter 10 passes.
1 and the other side has an opening 32 into which the igniter 10 is fitted.
It is a bottomed cylindrical body made of aluminum having The outer periphery of the end 33 of the opening 32 into which the igniter 10 is fitted has approximately 9
A flange portion 34 is formed so as to be turned to 0 degrees.

The inside of the holder 30 has an opening 3
The igniter 10 has a concave portion 35 which is continuous with the header portion 11 and accommodates the header portion 11 of the igniter 10, and a tapered wall surface 36 which is continuous with the concave portion 35 and abuts the tapered wall surface 12a of the igniter 10. The wall surface 36 is continuous with the opening 32. The bulge 12 of the igniter 10 extends from the boundary between the wall surface 36 and the opening 32 to the opening 32.
Will be accommodated. In addition, the wall surface on the peripheral edge side of the opening 31 forms the pressing portion 31a.

The body 40 is, as shown in FIGS.
One side has an opening 41 into which the igniter 10 can be inserted,
The other side has an opening 45 into which the connector of the electric sensor can be fitted.
It is a cylindrical body made of an aluminum alloy having the following. In addition, the flange portion 34 of the holder 30 and the flange portion 2 of the cup 20 are provided on the outer periphery of the opening 41 side into which the igniter 10 can be inserted.
An annular edge groove portion 42 having an edge portion 43 which can be fixed by caulking with the edge portion 3 is formed.

An igniter receiving portion 44 is formed on the body 40. The igniter receiving portion 44 has a wall surface which comes into contact with the wall surface 12a on the connector side of the bulging portion 12 of the igniter 10. The driving agent 50 is a mixture of a powder ignition agent and a granular propellant. A mixture of boron and potassium nitrate (powder) was used as the igniting agent, and nitrocellulose (granular) was used as the propellant.

The driving agent 50 in the cup determines the amount and component ratio of the driving agent 50 in order to conform to a predetermined pressure characteristic, and determines the filling ratio of the driving agent in the cup 50. In this embodiment,
The driving agent filling rate was 88%. The driving agent 50 receives the flame from the igniter 10 with a powdered ignition agent, ignites and burns, ignites and burns a granular propellant, and discharges the combustion gas to the driving device portion (in the module). .

In the present embodiment, the powdered and granular mixture is charged into the cup 20 as it is, but the mixture and the gas generating agent formed into a pellet (tablet) having a diameter of 3 mm and a thickness of 3 mm are mixed. It can be used even if mixed.

The gas generating agent is a mixture of a gas generating base comprising guanidine of 5,5'-bis-1H tetrazolamine salt and a nitrate of an inorganic metal salt as an oxidizing agent. Next, a method of assembling the gas generator according to the present embodiment will be described with reference to FIG. Note that explanations and drawings of jigs and the like used for assembling of the present embodiment are omitted, and essential points of assembling will be described.

Assembly process: 0.3 m remaining on the inner surface of the closed portion 21 of the cup 20 on the circumference from the central axis of the inner surface.
Eight mx lengths of 8 mm and rupture lines (tear lines) 26a are formed. The rupture line (tear line) 26a is formed to have a constant thickness by covering the inner surface of the cup 20 with a mold forming the rupture line (tear line) 26a.

As a result, as shown in FIGS. 6 and 7, the cut is formed on the inner surface of the cup, so that the remaining plate thickness of the cup is 0.3 mm. Next, the closing portion 21 of the cup 20 is directed downward, and a predetermined amount of the driving agent 50 obtained by mixing the powdered ignition agent and the granular propellant is filled. Assembling process: The holder 30 is inserted through the opening 22 of the cup 20, and the insertion is stopped when the flange 23 of the cup 20 and the flange 34 of the holder 30 overlap.

At this time, as shown in FIG. 8, a silicone sealing agent 37 is applied on the circumference of the flange portion 34 of the holder 30 where the flange portion 23 of the cup 20 overlaps. The axial length of the holder 30 is determined in relation to a predetermined filling rate of the driving agent 50 in the cup 20. Also,
The outer peripheral side surface 38 of the holder 30 and the inner peripheral side surface 27 of the cup 20 are in close contact with each other without any gap.

Assembling process: The igniter 10 is connected to the header 1
The first side is inserted first from the open end 32 of the holder 30,
The header 11 is mounted in the recess 35 of the holder 30. At this time, the tapered wall surface 12a of the igniter 10 and the tapered wall surface 36 inside the holder 30 maintain both of them at the center axis.

The igniter 10 is, for example, as shown in FIG.
As shown in FIG. 7, the joining surface between the resin plug 14 and the cap 19 is subjected to ultrasonic welding w. FIG. 23 shows the ultrasonic welding process. First, the cap 19 is set on the receiving jig 60, and the ignition charge 18 is charged into the cap 19.

Next, the ignition charge 18 is temporarily pressurized by the temporary pressurizing jig 61. Thereafter, the two lead pins 15 and 16 are molded, the resin plug 14 to which the heat generating portion 17 is connected is placed on the cap 19, and is inserted into the cap 19 while being vibrated by the horn 62. Then, the cap 19 and the resin plug 1
When the horn 4 comes into close contact, the vibration by the horn 62 is stopped.

As described above, the igniter 1 shown in FIG.
0 is produced. Assembly process: tapered wall surface 12b of igniter 10
Is applied with a silicone sealant 39. At this time, the silicone sealant 39 enters the gap between the tapered wall surface 12b and the holder 30 over the bulging portion 12 of the igniter 10, stops inside the bulging portion 12, and is further applied.

Assembling process: The body 40 is connected to the igniter 1
The igniter receiving portion 44 is inserted from the connector portion 13 side of the igniter 10, and the igniter receiving portion 44 comes into surface contact with the wall surface 12a of the bulging portion 12 of the igniter 10 on the connector portion 13 side. At this time, the flange portion 34 of the holder 30 and the cup 20 are inserted into the annular edge groove portion 42 of the body 40.
Is inserted.

Assembling process: The cup 20 and the holder 30 are fixed and the igniter 10 is held and fixed at the same time by caulking the edge 43 of the annular edge groove 42 so as to bend inward. Assemble. Here, with respect to the filling rate of the driving agent 50 in the cup 20, the amount of the driving agent 50 and the ratio of the components are determined in order to match a predetermined pressure characteristic, and the driving agent 50 and the holder 30 in the cup 20 are determined.
The space with the upper surface of the opening 31 side is set at a predetermined interval.

Next, the function (operation) according to the operation of the gas generator 1 according to the present embodiment will be described. First, connector 1
The heat generation unit 1 of the igniter 10 is generated by an electric signal from the third side.
The igniter 18 generates heat, and the igniter 18 in contact with the heat generating portion 17 is ignited. The flame ruptures a tear line 19a on the upper surface of the header portion 11 of the igniter 10 and advances in the axial direction while opening the holder 30. The driving agent 50 stored in the cup 20 is ignited through the portion 31. At that time, first, the powdery ignition agent of the driving agent 50 is ignited, and almost simultaneously, the granular propellant is ignited.

The igniting agent of the driving agent 50 burns the propellant and outputs the initial pressure (1-2 ms). Then, when the combustion gas of the driving agent 50 increases to a certain pressure in the cup 20, a rupture line (tear line) 26 of a break portion 26 formed on the upper surface of the closed portion 21 of the cup 20 is formed.
a is broken and the combustion gas is released into the module.

The igniter 10 generates stress on the body 40 side due to the reaction of the pressure (internal pressure) of the combustion gas. At this time, since the igniter receiving portion 44 of the body 40 has a tapered shape, as shown in FIG. 10, the shear surface has an angle to the direction of the pressure load, and compressive stress acts on the shear surface. Then, the compressive stress increases the frictional resistance inside the material (aluminum alloy) of the body 40 and acts as a reaction force against the shear stress due to the pressure (internal pressure) of the combustion gas.

Therefore, the shear strength becomes stronger than the simple shear stress as shown in FIG. 11, and the pressure resistance of the body increases. FIG.
1, a conventional gas generator 100 is shown. The experimental results regarding the compressive strength are described in “Experimental Examples” described later.
Shown in FIG. 12 shows an outline of the tank pressure test apparatus for the tank pressure test. With this device, the internal pressure was measured using a 10 cc internal volume tank C to which a gas generator A and a pressure sensor B could be attached.

1. 10c gas generator A and pressure sensor B
c Attach to tank C. 2. Pressure sensor B is a measuring device (analyzing recorder)
D, the gas generator A is connected to the ignition power source E, and the measuring instrument D is connected to the ignition power source E. 3. When a voltage is applied from the ignition power source E, the gas generator A ignites and the pressure in the 10 cc tank C increases. At this time, the measuring device D senses the voltage from the ignition power source E and
The measurement of the pressure in the tank C is started.

4. The measured data is represented as a time-pressure curve. FIG. 13 shows a case where the gas generator 1 according to the present embodiment, which has a sufficient filling rate because there is no blind space, is arranged in the horizontal direction, the upward direction, and the downward direction. FIG. 14 shows a conventional gas generator 100 in which a sufficient filling rate cannot be ensured due to the presence of a blind space, in which the respective gas generators are arranged in the horizontal, upward, and downward directions.

FIG. 15 shows the results of installing and operating the gas generators 1, 100 in each direction. As is clear from FIG. 15, there was a large difference between the peak of the tank pressure and the peak time of the pressure. Gas generator 1 according to the present embodiment
Then, the rising pressure at the time of ignition is fast, and 9m
s reached the peak of pressure. Also, there was no problem in the tank pressure difference in the horizontal, upward and downward directions.

However, in the conventional gas generator 100, the pressure at the start of the initial operation is slow, and is as slow as 14 ms at the peak of the tank pressure. In addition, when the tank pressure of 5 ms is seen, there is a large variation in the difference between the horizontal direction, the downward direction, and the upward direction, indicating an unstable output. Consideration 1: Since the burning rate of the propellant in the driving charge 50 greatly changes depending on the pressure at the time of combustion, the magnitude of the initial pressure is as follows.
This causes the amount of generated gas per time during combustion to be different, and for example, causes the tank pressure (absolute pressure) to change even if the total amount of generated gas is the same.

Further, in the conventional gas generator 100, in the case of the horizontal orientation, the combustion pressure varies depending on the presence or absence of the driving agent located in the blind space.
In the case of the upward direction, the distance between the igniter flame surface from the upper surface of the igniter header and the charging surface of the driving agent causes the ignition delay to be large or small. Therefore, if a sufficient filling rate cannot be ensured, the distance between the flame surface and the filling surface increases, which causes ignition delay.

Further, in the case of the downward direction, both the gas generator 1 according to the present embodiment and the conventional gas generator 100 have the charging surface in contact with the flame surface of the igniter, so that there is no ignition delay. In the conventional gas generator 100, the driving pressure enters the blind space more than in the horizontal state, so that the combustion pressure varies. FIG. 16 shows the results of an experiment in which the gas generator 1 according to the present embodiment and the conventional gas generator 100 are operated five times under a certain condition, respectively, to determine whether output variations occur.

The certain condition is a specification in which the kind of medicine, the amount of medicine, the filling rate and other parts (igniter, body) are the same. Consideration 2: In the gas generator 1 according to the present embodiment, there is no difference between the maximum pressures at the peak of the tank pressure and the combustion pressure is stable for all five times.

However, in the conventional gas generator 100, the time at the peak of the tank pressure varies, and the maximum pressure also varies, so that the combustion pressure is unstable. In addition, for the driving medicine in the cup, the medicine amount and the component ratio are determined in order to meet a predetermined pressure characteristic, and the driving medicine filling rate in the cup is determined. Since the outer diameter and length of the cup 20 are almost standardized among manufacturers, when obtaining required high-output and low-output pressure characteristics, the cup shape (length and the like) is not changed. In addition, by replacing the holder 30, the volume part of the medicine amount is reduced to the optimum filling rate (80% to 90%).
%).

That is, the length of the holder 30 is adjusted so as to obtain a predetermined filling rate of the driving agent 50, and the pressure is adjusted to a predetermined pressure characteristic. This makes it possible to maintain the pressure characteristics by adjusting the holder 30 without changing the outer diameter and length of the cup when the amount of the driving medicine in the cup 20 is changed, and to hold the igniter 10 together with the body 40 in a pressure-resistant manner. It becomes even more possible.

The body 40 holding the bulging portion 12 of the igniter 10 on the connector portion 12 side is provided with an annular edge groove portion 42.
The flange portion 34 of the holder 30 and the flange portion 23 of the cup 20 are placed on the annular edge groove portion 42 so as to overlap each other, and the edge portion 43 of the annular edge groove portion 42 is bent inward and fixed by caulking. Since only one caulking is required, the body 40, the igniter 10 and the holder 30 can be securely fixed and held integrally by the caulking process.

As a result, the igniter 10 is
And the dimensional accuracy can be enhanced. Also, since the O-ring is not used, the igniter 1
When the igniter 10 is fixed, no local stress is applied to the igniter 10.

Furthermore, the pressure resistance of the body 40 can be increased with respect to the pressure load on the body 40 when the igniter 10 is operated. Further, the breaking portion 26 that breaks due to the combustion pressure of the driving agent 50 in the cup 20 is
0 of the closed surface 21 in the circumferential direction (radially) from the center axis of the rupture line 26a having a predetermined depth and a predetermined length in the circumferential direction (radially), so that the fracture portion 2
When the fuel cell 6 breaks due to the internal pressure with the combustion of the driving agent 50 and releases gas into the module, a radial burst line (tear line) is generated.
26a is sheared from the central axis and burst line (tear line) 26a
Debris detachment does not occur. The rupture line (tear line) 26a which does not separate the fragments is related to the thickness of the closing surface 21 of the cup 20 and the remaining thickness of the rupture line (tear line) 26a, and is a rupture line (tear line) 2 with respect to the thickness of the closing surface 21.
The plate thickness of 6a is more preferably in the range of 30 to 50%.

Here, the tear line (tear line) 26a will be described in detail. In the present invention, the gas pressure does not cause shearing (opening out) from the corners of the closing portion 21 of the cup 20, and the breaking portion when breaking from the rupture line (tear line) 26 a formed in the closing portion 21. There is no debris scattering,
The feature is that it has an open part. That is, the object is to prevent scattering of foreign matter from the broken portion during operation.

In the conventional gas generator, the prevention of foreign matter scattering was not sufficient for the following reasons. 1) The dimensions are not set in accordance with the processing method of the aluminum cup. 2) The rupture line (tear line) depth corresponding to the thickness of the side cylindrical surface and the bottom surface of the aluminum cup is not secured.

Therefore, in the conventional gas generator, the measures for preventing the scattering of foreign matter are not perfect, and there is a risk that part fragments may be rarely released. Therefore, in the present invention, this problem has been solved by taking the following solution. 1) Bottom shape of aluminum cup Forging or drawing is generally used as a method of processing an aluminum cup. In that case, the plate thickness of the cup bottom surface is thicker than the side tube surface plate thickness, and the boundary between the bottom surface and the side tube surface (R at the bottom of the cup)
Part) is the weakest point.

If the pressure is static, the bottom surface and the side cylinder surface are deformed (swell), and then the side cylinder surface is cracked and the container is broken. In the gas generator according to the present invention, the pressure is a dynamic pressure having directivity, and the side cylinder surface is restrained by the inner wall of the module. A rupture line (tear line) is cut as a countermeasure, but it has been confirmed that immediately before the rupture line (tear line) is released, the bottom surface swells and considerable stress is applied to the R portion. Therefore, even if the rupture line (tear line) is opened, the R portion is torn by the movement of the rupture line (tear line) (reaction to open).

Therefore, it is important to reinforce the R portion, and as a method of increasing the R portion, the effect is high. This is because the larger the value of R, the smaller the local stress, and the smaller the gap between the bottom surface and the side cylinder surface in thickness. In the present embodiment, the material thickness t: 0.6 mm, the outer diameter φ13.
In 6 mm cup drawing, R outside the bottom is 0.8
mm or more. At this dimension, the bottom surface does not scatter as long as the tear line design is appropriate.

2) Setting the Depth of the Rupture Line (Tear Line) (Remaining Plate Thickness) For the same reason as in the preceding paragraph, unless the depth and length of the rupture line (tear line) are optimized, the rupture line (tear line) scatters. May occur.

The relationship between the rupture line (tear line) depth and the opening pressure and the relationship between the rupture line (tear line) depth and the presence or absence of scattering were investigated, and the optimum depth was set. As a result, it was found that 50% or less of the plate thickness was optimal. Also, the length of the rupture line (the tear line) (diameter of the circumscribed circle of the rupture line (the tear line)) has an optimum diameter with respect to the diameter of the bottom surface subjected to the internal pressure, and 60 to 70% of the bottom surface inner diameter is optimal. I found it to be.

In this embodiment, the rupture line (tear line) 2
The length of 6a is 8 mm. This is the bottom inside diameter φ1
65% of 2.4 mm. Next, due to the gas pressure, there is no shearing (opening out) from the corners of the closing portion 21 of the cup 20, and the fragments are scattered at the breaking portion when breaking from the rupture line (tear line) 26 a formed in the closing portion 21. There is no
The opening will be further described.

1) Calculation of tear line rupture pressure The closing portion 21 of the cup 20 deforms into a sphere when subjected to internal pressure, as shown in FIG. Then, when the elongation reaches the limit of the material, it starts to break from the center of the bottom (the center of the tear line) where the deflection is greatest. here,
Determine the maximum deflection when elongation reaches the limit of the material. Each dimension and elongation are determined as follows.

Inner diameter at bottom: S Radius of curvature at deformation: r Length of arc at deformation: L Inner angle of arc at deformation: θ Deformation amount: h Material elongation: ε The following equation is established from the arc expression and material elongation.

H = S / 2 · tan θ / 4 (1) (arc equation) S = r · sin θ / 2 (2) (arc equation) L = rθ (3) (Arc equation) L = S (1 + ε) (4) (Elongation equation) The following equation (5) is obtained from equations (2) to (4), and θ can be calculated.

Sin θ / 2 = {1 / (1 + ε)} · θ / 2 (5) By substituting θ obtained by equation (5) into equation (1), deformation at the limit of material elongation can be obtained. The amount (deflection amount) h is determined.
By substituting the obtained h into the equation for the deflection of the disk in the following equation (6), the breaking pressure of the rupture line (the tear line) is obtained.

P = 64Dh / a ⁴ (6) where, ν: Poisson's ratio a: radius of the disk D: rigidity of the disk D = Et ³ (1-ν ² ) / 12 E: elastic modulus t = thickness of the disc 2) Calculation of bottom slippage (disc slippage) The pressure at the time of cup bottom slippage is obtained by the following equation (7) for the shear load of the disc.

P = 4τt / d (7) Here, each symbol is as follows. τ: shear stress d: disk diameter t: disk thickness 3) Relationship between rupture line (tear line) fracture and bottom-out The following shows an example of the contents calculated in 1) and 2) above.

FIG. 18 is a graph in which the values of the equations (6) and (7) are shown in Table 1 and the thickness of the remaining rupture line (the tear line) is plotted on the X-axis. The bottom line on the graph is a value when the cup bottom plate thickness is 0.5 mm. The point where the two lines intersect is the rupture line (tear line) 26
This is the boundary between whether a is broken or the bottom comes off. In the area where the rupture line (tar line) rupture pressure is lower than the bottom release pressure, when pressure is applied, the rupture line (tar line)
26a breaks.

[Table 1] Next, a description will be given of the fact that there is no scattering of fragments at the broken portion when the rupture line (tear line) 26a breaks. 1) Number of rupture lines (tear line) 26a The number of rupture lines (tear line) 26a and scattering of fragments (burst line (tear line)) during operation will be considered.

During operation of the gas generator, the rupture line (tear line) 26a is broken by internal pressure, and divides the bottom of the cup 20 into a plurality of sectors. If the internal angle of the sector is large, the elongation of the material at the time of unfolding becomes a limit, and the area to be broken at the bent portion becomes large. On the other hand, if it is too small, all the lines cannot be broken, and uneven development is not preferable.

Therefore, the optimum inner angle of the fan shape at the time of development, that is, the number of rupture lines (tear lines) 26a exists in order to prevent foreign matter scattering. 1-1) Calculation of Breaking Ratio of Rupture Line (Tear Line) 26a FIGS. 19 and 20 show a state in which the rupture line (tar line) 26a is broken and the closing surface 21 of the cup 20 is unfolded.

When the tear line 26a is torn and the closing surface 21 of the cup 20 is unfolded, the fan-shaped bent portion is considered to be an intermediate position between the R portions of the closing surface 21 of the cup 20. The development length d / 2 at that time is as shown in the following equation (8).

D / 2 = d ′ / 2−Rcos 45 ° = 6.566 (mm) (8) Cup outer diameter: d ′ = 13.6 (mm) R part: R = 0.8 (mm) In addition, the development distance ΔL of the bent portion is represented by the following equation (9). ΔL = (d / 2) · (1-cos θ / 2) (mm) (9) Here, when the closed surface 21 of the cup 20 is expanded and bent, only the R portion is extended by bending. Then, the original length L of the extending portion is πR / 2 = 1.257.
(Mm).

Therefore, the elongation ε of the bent portion is expressed by the following equation (10). ε = ΔL / L = (d / πR) · (1−cos θ / 2) (10) When Expression (10) is modified with respect to θ, the following Expression (11) is obtained. Inner angle of elongation ε: θ = 2 cos ⁻¹ (1−επR / d) (°) (11) By substituting the elongation of the material used in equation (11),
The internal angle of the fan shape that is connected without breaking when unfolding is required.

Inner angle of connected sector: θ ′ ← Equation (1)
Substituting ε into 1) Elongation of material: ε ′ Accordingly, the breaking ratio of the arc portion at the time of development is as shown in the following equation (12). Breaking ratio: B = (1−θ ′ / θ) × 100 (%) (12) 1-2) Breaking ratio of rupture line (tear line) and foreign matter scattering According to an experiment, the aluminum alloy of the present embodiment is formed. Cup 20 (material: A1050H24, elongation: 9.5%)
If the breaking ratio exceeds 75%, the rupture line (tear line) 26a may be scattered. The number of tear lines 26a at that time is four.

When the number of rupture lines (tear lines) 26a exceeds 8, a line that does not break is generated.
Increasing the number more than this is not only meaningless, but also results in uneven distribution of breaks, which is not preferable.

Therefore, in order to prevent foreign matter from scattering, the number of rupture lines (tear lines) 26a should be four to eight. However, this number is based on the case of using the aluminum cup material of the present embodiment, and when the material changes and the elongation changes, the breaking ratio is 75% based on the concept of the above 1-1).
Should be set to:

Here, the minimum number is determined by the limit of the breaking ratio (75
%), And Table 2 shows the difference depending on the material used when the maximum number is eight.

[Table 2] Next, FIG. 21 shows the relationship between the tear line thickness and the breaking pressure. The scattering state changes when the depth of the rupture line (tear line) 26a is between 0.3 mm and 0.4 mm. In the case of 0.4 mm and 0.5 mm, the bottom portion is scattered, and the bottom R portion is broken despite the provision of a fragile portion called a rupture line (tear line) 26a. This also indicates that it is necessary to optimize the depth of the rupture line (tear line) 26a.

Next, a rupture line (tear line) 19a of the cap 19 of the igniter 10 will be described in detail. The basic technical idea is that the tear line 26a of the cup 20
Is the same as The conditions under which the fragments of the broken portion of the rupture line (tear line) 19a of the cap 19 scatter vary depending on whether the holder 30 holds and holds the cap 19 of the igniter 10 or not.

If there is no holder 30 that exerts the function of pressing the cap 19, the tear line 19a may be scattered. On the other hand, the rupture line (tear line) 26 a of the cup 20 does not include a member corresponding to the holder 30 that exerts the function of pressing the cap 19.

The cup 20 alone does not scatter foreign matter. It is considered that the difference between the cup 20 and the cap 19 is due to the difference between the gas to be opened and the material of the parts. In the combustion of the igniting charge (trisinate) 18 and the driving charge (single-base propellant) 50, the impact given to the rupture lines (tear lines) 19a and 26a is different. In addition, even with materials having the same elongation, there is a difference in tensile strength between aluminum and resin. Considering these two factors, the rupture lines (tear lines) 19a, 26
Obviously, the cap 19 has a larger burden on a.

The prevention of the rupture line (tear line) 19a of the cap 19 from scattering will now be described. Igniter 1
The resin used for No. 0 is selected in consideration of heat resistance, strength, and weather resistance. In this embodiment, polyphthalamide is used as a pace polymer. However, the cap 19 having the rupture line (tear line) 19a needs an optimum material strength and elongation. The igniter 10 and the base polymer are the same, and a material is selected in consideration of the material strength and elongation.

Table 3 shows the results.

[Table 3] The rupture line (tear line) of the cap 19 of the igniter 10
Optimizing the size and material of the 19a is effective as a measure for preventing the rupture line (the tear line) 19a from scattering. However, when a stronger impact such as an increase in the amount of ignition charge or a change in ignition charge is applied to the rupture line (tear line) 19a, it may be scattered.

For this reason, in order to buffer the impact of the rupture line (tear line) 19a, a holding portion 31a is added to the holder 30 to take measures to prevent scattering. Next, the holder 30 will be further described. Rupture line of cap 19 (tear line)
The relationship between 19a and the holder 30 holding the cap 19 depends on the hole diameter of the opening 31 formed on the end face of the holder 30 and the shape of the edge 31a of the opening 31.

If the strength, hardness and elongation of the material of the holder 30 are appropriate, the holding portion 31a is deformed by the impact of the rupture line (tear line) 19a. The movement at this time backs up the rupture line (tear line) 19a, but if the strength is strong, the rupture line (tear line) 19a is broken, and if the hardness is high or there is no elongation, the pressing portion 31a is not.
a. Therefore, the holder 30 functions only when the mechanical properties of the material are balanced.

If the pressing portion 31a is too strong (small hole diameter) or too weak (large hole diameter), the rupture line (tear line) 19 is broken by impact. When the shape of the holding portion 31a is sharp (small chamfering), the rupture line (tear line) 19a is sheared. That is, scattering of the rupture line (tear line) 19a is effectively suppressed by the shape of the pressing portion 31a.

The shape of the holding portion 31a is, for example,
24, 25, 26, and 27 are shown. The example shown in FIG. 24 has a hole diameter: φ4 to φ5 mm, a corner shape: C
Or R 0.3 to 0.5, plate thickness: 0.5 mm to 1 mm,
Material: A5052, A6061. The example shown in FIG. 25 shows a case where the chamfer inside the hole is made larger than that in FIG.

The example shown in FIG. 26 is an example in which the hole is formed into a tapered hole whose diameter is reduced toward the tip as compared with FIG. FIG.
The example shown in FIG. 7 shows an example in which the hole is formed as an R chamfered hole whose diameter is reduced toward the tip as compared with FIG. Next, a comparative test was performed between the length of the rupture line (the tear line) 19a of 6 mm and 4 mm, and it was confirmed that there was a significant difference. If the length is 6 mm, the rupture line (tear line) 19a is scattered.

A comparative test was conducted with the resin for the igniter body, and it was confirmed that there was a significant difference. Body resin (A-11
At 45 HS), the rupture line (tear line) 19a is scattered. FIG. 28 shows a gas generator 1A according to another embodiment of the present invention (corresponding to claim 17).

[0106] The gas generator 1A according to this embodiment is the same as that shown in FIG.
Igniter 1 like the conventional gas generator 100 shown in FIG.
0A is caulked to the body 40 via an O-ring. However, the igniter 10A has
Similarly, the cap 19 has a rupture line (tear line) 19a.
Is provided. An insertion type holder 30A shown in FIG. 29 is provided on the head side of the igniter 10A.

As shown in FIG. 28, the insertion type holder 30A has an outer peripheral wall contacting an inner peripheral wall surface of the cup and a leading end contacting a step portion of the chamfered portion 25 which is narrower than the body of the cup. It is held and fixed by caulking and fixing the flange and the body edge. Also in this case, the holder 30A prevents the rupture line (the tear line) 19a of the cap 19 from scattering.

Of course, the holding portion 31A of the holder 30A is
It is preferable that the hole diameter and the hole shape are the same as those of the holding portion 31a of the holder 30. Further, the cup 20A is provided with a rupture line (tear line) 21a, similarly to the gas generator 1 according to the present embodiment. FIG. 30 shows a gas generator 1B according to another embodiment of the present invention (corresponding to claims 8 and 9).

The present embodiment relates to a gas generator in which the O-ring is removed from the conventional gas generator 100 shown in FIG. Also in this embodiment, it is possible to reliably hold the igniter 10B by using the bulging portion of the igniter 10B. There is no problem in the pressure resistance.

The igniter 10B and the cup 20
Are provided with rupture lines (tear lines) 19a and 21a, similarly to the gas generator 1 shown in FIG. These functions and effects are the same as those of the gas generator 1. [Experimental example] (Ensuring high structural strength) 2. Conventional Problems Conventional gas generator 100 (system in which standard-shaped igniter is fixed with an O-ring) as shown in FIG. 11 1) Since the body dimensions are limited, it is difficult to increase the withstand pressure cross-sectional area.

2) In order to increase the strength within a limited dimensional range, the material must be changed to a high-strength material. 3) In the double lock type (shortening crimp diameter is large), the structural strength is lower than that of the present. here,
The hole diameter X is 10 mm for a single lock type and 11.1 mm for a double single lock type. Further, the width of the inner seat Y of the opening is limited to a maximum of 1.4 mm.

Therefore, in the case of the conventional gas generator 100, it is difficult to increase the structural strength, and when an increase in structural strength is desired as a market requirement, or in the case of a double lock type, a decrease in strength is inevitable. In contrast, the present invention has taken the following solution. 1) Increase in withstand voltage cross-sectional area By removing the O-ring, the withstand voltage cross-sectional area was increased.

In the conventional gas generator 100, the withstand pressure cross-sectional area (expected fracture cross section when an igniter load is applied due to the internal pressure) is 44.0 mm ² , whereas that of the gas generator 10 according to the present embodiment is It was 80.5 mm ² , which was about twice as large. Although the sealant is filled instead of the O-ring, the sealant-filled type has good sealing performance and does not impair the function of the igniter.

2) Provision of Angle of Pressure-Proof Cross Section The shape of the caulking groove of the body was devised so that the pressure-proof cross section was designed to have an angle with respect to the direction of the pressure load. The groove in the body is where the cup is inserted and shampooed. In the present embodiment, instead of directly applying the cup to the groove portion, the cup is crimped so as to sandwich a holder (a component for fixing the igniter together with the body).

Since the shape of the flange of the holder can be made relatively freely, the corner of the groove can be formed into a large C or R shape. With this groove shape, an angle can be provided in the pressure-resistant section. That is, in the conventional gas generator 100 shown in FIG. 11, the pressure-resistant surface angle is 0 ° as represented as a shear plane. On the other hand, in the present embodiment, as shown in FIG. 10, a pressure-resistant surface angle can be given so as to be displayed as a shear plane.

By setting the angle, a compressive stress acts on the fracture surface. This compressive stress increases the frictional resistance inside the material and acts as a reaction force against shear stress due to internal pressure. Therefore, it becomes stronger than the simple shear stress, and the compressive strength increases. Discussion 1) Increase in withstand pressure cross-sectional area As a result of performing a destructive test of the conventional gas generator 100 and the gas generator 10 according to the present embodiment, it was possible to obtain a destructive pressure commensurate with the increase in withstand pressure cross-sectional area.

Table 4 shows the results.

[Table 4] The reason why the increase in breakdown pressure is 1.7 times lower than the increase in pressure resistance area of 1.8 times is that about 300 MPa is close to the breaking strength of the igniter itself, and thus the pressure resistance of the body is limited. I think that the.

2) Application of Angle of Breakdown Section The breakdown test was performed by changing the angle of the breakdown section with respect to the pressure receiving direction. As a result, it was found that the breakdown pressure increases as the breakdown section angle increases. The results are shown in Table 5 and FIG.

[Table 5] The calculated values here take into account the component force due to the angle, but do not take into account the frictional resistance inside the material. Therefore,
In the vicinity of the angle 0 °, the calculated value and the measured value match.

On the other hand, the pressure resistance of the igniter is 300MP.
Due to the vicinity of a, the burst pressure reaches a plateau when it exceeds about 16 ° at which the burst pressure reaches 300 MPa.
In addition, double lock type (shortening crimb diameter:
200M even with φ11.1mm → section angle: 3.1 °)
Pa can be realized. From the above results, the following advantages are obtained.

When a standard size igniter is used, the structural strength is about twice that of a conventional igniter. Since the strength is increased by the shape (pressure-resistant cross-sectional area and angle), the degree of freedom in selecting the body material is high. Even the double lock type exceeds the structural strength of the conventional igniter (single lock type).

Next, the breakdown voltage sectional area will be described in detail. 1-1 Objective of test To confirm how the burst pressure changes when the withstand pressure cross section is changed.

1-2 Test Method (1) Confirmation of Increase in Structural Strength by Increasing Cross-sectional Area The structure of the conventional gas generator 100 and the structure of the gas generator 10 according to the present embodiment are the same as those of the present embodiment using the same material. A destructive test is performed on the body 30 of the gas generator 10 to confirm an increase in structural strength due to an increase in cross-sectional area.

(2) Confirmation of ability when material is changed Since the gas generator 10 according to the present embodiment uses an aluminum alloy for the body 30, a destructive test is performed to confirm the structural strength. 1-3 Test method The test was performed using the equipment shown in FIG.

[0124] 1. In order to make the inside of the tank 90 an arbitrary volume, a spacer 91 is attached (all tanks in this test have a volume of 2 cc). 2. A gas generator G and a pressure sensor (not shown) are attached, and the gas generator G is connected to an ignition bus, and the pressure sensor is connected to a measuring instrument. The pressure sensor is mounted in the pressure mounting hole 92.

[0125] 3. An ignition current is supplied to the gas generator G to cause ignition, and the pressure in the tank 90 at that time is measured. 4. When the pressure rises, the gas generator G (the body 30, the igniter 10) is broken, and the combustion gas is discharged out of the tank. 5. Since the measured pressure waveform shows the maximum value at the time of rupture, this is defined as the rupture pressure (structural strength). This pressure waveform is shown in FIG.

Supplement: The internal volume of the test tank was set to 2 cc, the gas generator was arranged in the tank body, and electricity was supplied. When the gas combustion pressure (internal pressure) of the driving agent of the gas generator was increased,
The body of the gas generator cannot hold the igniter, and the igniter and the body are broken and discharged to the outside of the tank on the ignition bus side (connector side).

In FIG. 32, the tank 90 has
Knockout pin 93 operated by wing nut 95
Are attached via a collar 94. A cap 96 for fixing the gas generator G to the tank 90 is screwed to the tank 90. 1-4 Test results Table 4 shows the results.

In Table 4, ZDC2 is a JIS material code (two types of zinc alloys). A5056 is the JIS material code (aluminum alloy). By removing the O-ring, the conventional gas generator 100 has a withstand pressure cross-sectional area (expected fracture cross-section when receiving an igniter load due to internal pressure) of 44.0 m.
m ² , the gas generator 1 according to the present embodiment.
It was 80.5 mm ² , and approximately double the area could be secured.

As a result, the gas generator 1 according to the present embodiment
As a result, it was possible to obtain a burst pressure commensurate with the increase in the pressure-resistant sectional area. The reason why the increase in the breakdown pressure is 1.7 times as low as the increase in the pressure resistance area of 1.8 times is that about 300 MPa is close to the fracture strength of the igniter itself, so the pressure resistance of the body is limited. I think that the.

Next, the withstand pressure sectional area angle will be described in detail. 2-1 Purpose of test To confirm how the burst pressure changes when the pressure-resistant cross-sectional area angle is changed. 2-2 Test method In order to make elements other than the withstand pressure cross-sectional area angle as constant as possible, the withstand crimp diameter was changed to change the withstand pressure cross-sectional angle (specifically, X in FIGS. 10 and 11 was changed). To change the cross-sectional angle with respect to the axis).

With this method, the pressure-resistant area (shear area)
Can be suppressed as much as possible, and the influence of the pressure-resistant area angle can be investigated purely. 2-3 Test method Perform a destructive test in the same manner as the withstand pressure cross section, and measure the pressure at the time of destruction. 2-4 Test results The breaking test was performed by changing the angle of the pressure-resistant cross section with respect to the pressure-receiving direction.

Table 5 shows the results. In Table 5, A5056 was used as the body material. Since the pressure resistance of the igniter is around 300 MPa, when the burst pressure exceeds about 16 ° at which the burst pressure reaches 300 MPa, the burst pressure reaches a plateau. From the test results, since the larger the angle, the higher the burst pressure, there is a concern that the burst pressure decreases when the angle is small. However, about 180MP even around the angle of 0 °
It has a burst pressure of about a, and there is no practical problem.

Therefore, a double lock type (shortening crimp diameter: φ11.1 mm, cross-sectional angle θ: 3.1)
°), it is possible to ensure a burst pressure of 200 MPa or more (in terms of the double lock type having sufficient structural strength, the advantage of the increase in the pressure-resistant area described in the preceding paragraph is stronger than the angle of the pressure-resistant area is given). .).

[0134]

The present invention has the following effects.

(1) The holder can hold the flared portion of the igniter on the header side and can eliminate blind space. (2) By adjusting the length of the holder in the axial direction, a predetermined filling rate of the driving agent in the cup can be secured and the pressure characteristics can be stabilized.

(3) Since the connector portion side of the bulging portion of the igniter and the igniter receiving portion of the body receiving this connector portion have the same shape, when the gas generator is operated,
A pressure-resistant structure that can sufficiently withstand the operating pressure of the igniter is obtained. (4) Since the rupture line (tear line) is provided on the bottom surface of the cup closing portion, the broken fragments do not separate due to the combustion gas pressure.

(5) Since the rupture line (tear line) is provided on the bottom surface of the igniter cap closing portion, the broken fragments are not released due to the combustion gas pressure. (6) Since the igniter is covered with the holder and a rupture line (tear line) is provided on the bottom surface of the cap closing portion, the pressure of the combustion gas is alleviated by the holding portion of the holder and the rupture line (tear line) can be prevented from coming off.

[Brief description of the drawings]

FIG. 1 is an overall sectional view showing a gas generator according to an embodiment of the present invention.

FIG. 2 shows a cross section of the igniter in FIG.

FIG. 3 is a sectional view of the cup in FIG. 1;

FIG. 4 is a top view of the cup in FIG. 1;

FIG. 5 is a side view of the cup in FIG. 1;

FIG. 6 is a top view of a break (rupture line (tear line)) formed in the cup in FIG. 1;

FIG. 7 is a sectional view taken along the line B-B 'of FIG.

FIG. 8 is a sectional view of the holder of FIG. 1;

FIG. 9 is a view sequentially showing the assembly of the gas generator shown in FIG. 1;

FIG. 10 is a sectional view relating to the pressure resistance of the body in FIG. 1;

FIG. 11 is a cross-sectional view relating to the pressure resistance of a conventional body.

FIG. 12 is an explanatory diagram showing an outline of a tank pressure test device.

FIG. 13 is a cross-sectional view showing a state where the gas generator according to the embodiment of the present invention is turned in each direction.

FIG. 14 is a cross-sectional view showing a state where a conventional gas generator is turned in various directions.

FIG. 15 is a graph showing the results obtained according to FIGS.

FIG. 16 shows that the gas generator according to the present embodiment and the conventional gas generator under a certain condition are respectively operated five times,
9 is a graph showing a result of an attempt to determine whether output variation occurs.

FIG. 17 is an explanatory diagram showing a state when a rupture line (tear line) of a cup receives a breaking pressure.

FIG. 18 is a graph showing a relationship between a tear line rupture of a cup and a bottom break.

FIG. 19 is an explanatory view showing a broken state of a tear line of the cup.

20 is an enlarged explanatory view showing a broken state of a tear line of the cup of FIG. 19;

FIG. 21 is a graph showing the relationship between the thickness of the tear line of the cup and the breaking pressure.

FIG. 22 is a sectional view showing an example of the igniter in FIG. 1;

FIG. 23 is an explanatory view showing an ultrasonic welding step of the igniter shown in FIG. 22;

FIG. 24 is a sectional view of the holder in FIG. 1;

FIG. 25 is a sectional view of the holder in FIG. 1;

FIG. 26 is a sectional view of the holder in FIG. 1;

FIG. 27 is a sectional view of the holder in FIG. 1;

FIG. 28 is an overall sectional view showing a gas generator according to another embodiment of the present invention.

29 is a sectional view showing an insertion type holder used for the gas generator in FIG. 28.

FIG. 30 is an overall sectional view showing a gas generator according to another embodiment of the present invention.

FIG. 31 is a graph showing a relationship between a withstand pressure cross-sectional area and a body breaking pressure.

32A and 32B are a front view and a cross-sectional view showing a test device having a withstand pressure cross-sectional area.

FIG. 33 is a graph showing a burst test pressure waveform.

[Explanation of symbols]

 1, 1A, 1B gas generator 10, 10A, 10B igniter 11 header part 12 bulging part 12a, 12b tapered wall surface 13 connector part 19 cap 19a rupture line (tea line) 20 cup 21 closing part 22 opening end 23 flange Part 26 Breaking part 26a Rupture line (tear line) 28 Driving medicine storage part 30, 30A Holder 31 Opening 31a Pressing part 34 Flange part 37 Silicone sealant 40 Body 42 Ring edge groove part 43 Edge part 44 Igniter receiving part 50 Driving agent

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D054 DD17 DD28 FF01 FF02 FF04 FF17 FF18 4G068 AA01 AB01 CC01 DA08 DB15 DD01

Claims (17)

[Claims] An igniter having a header portion and a connector portion, wherein the header portion and the connector portion are connected via a bulging portion; and an igniter abutting on the connector side of the bulging portion of the igniter. A body to be arranged, a bottomed cylindrical holder having an opening on the bottom surface through which a flame from the igniter passes and arranged to cover the outer periphery of a header portion and a bulging portion of the igniter; A bottomed cylindrical cup having an inner peripheral side surface overlapping the outer peripheral side surface and having a closed portion on the bottom surface; and a driving agent accommodated in the cup, wherein an open end of the holder and an open end of the cup are provided. The igniter is sandwiched between the holder and the body via the bulging portion by overlapping and caulking the body, Inner peripheral and side surfaces, and adhesion as no gap, between the closure of the cup and the opening side of the holder,
A gas generator characterized by forming a driving medicine accommodating portion. 2. The igniter body includes: an igniter receiving portion formed of a wall surface in surface contact with a connector-side wall surface of the igniter bulging portion; a flange portion provided outside an open end of the holder; 2. The gas generator according to claim 1, wherein an annular edge groove having an edge which can be fixed by caulking and fixing a flange provided outside the opening end of the gas generator is integrally formed. 3. The gas generator according to claim 2, wherein a silicone sealant is applied to a flange of a flange provided outside the opening end of the holder. 4. The gas generator according to claim 2, wherein a silicone sealant is applied to an igniter receiving portion of the body. 5. The driving medicine storage section changes the filling rate of the driving medicine by 80% to 9% by replacing the holder.
The gas generator according to claim 1, wherein the gas generator can be set to 0%. 6. An igniter having a header part and a connector part, a body attached to the connector part side of the igniter, a closed part on the bottom surface, a rupture line provided on the bottom surface, and a bottomed part attached to the igniter. A gas generator comprising: a cylindrical cup; and a driving agent accommodated in the cup. 7. The gas generator according to claim 6, wherein the rupture line forms a remaining plate thickness of 30% to 50% with respect to the plate thickness of the bottom surface. 8. An igniter having a header portion and a connector portion and having a rupture line in the header portion, a body attached to the connector portion side of the igniter, and a closing portion on a bottom surface, the igniter being attached to the igniter. A gas generator comprising: a bottomed cylindrical cup; and a driving agent accommodated in the cup. 9. The gas generator according to claim 8, wherein the rupture line forms a remaining plate thickness of 30% to 50% with respect to the plate thickness of the bottom surface. 10. An igniter having a header portion and a connector portion, wherein said header portion and said connector portion are connected via a bulge portion, and wherein said igniter is in contact with said bulge portion on the connector side. A gas generator comprising: a body to be disposed; a closed-end cylindrical cup having a closed portion on a bottom surface, which is attached to the igniter; and a driving agent accommodated in the cup. 11. An igniter having a header portion and a connector portion and provided with a rupture line in the header portion, a body attached to the connector portion side of the igniter, a closing portion on a bottom surface, and a rupture line on the bottom surface. A gas generator, comprising: a bottomed cylindrical cup provided to be attached to the igniter; and a driving agent accommodated in the cup. 12. An igniter having a header portion and a connector portion, wherein the header portion and the connector portion are connected via a bulging portion, a body attached to the connector portion side of the igniter, and a bottom surface. A gas generator comprising a closed portion, a rupture line provided on the bottom surface, a bottomed cylindrical cup attached to the igniter, and a driving agent accommodated in the cup. 13. An igniter having a header portion and a connector portion and provided with a rupture line in the header portion, a body attached to the connector portion side of the igniter, and an opening through which a flame from the igniter passes is provided on a bottom surface. A bottomed tubular holder having a closed portion on the bottom surface and being attached to the igniter, the bottomed tubular cup having a closed portion on the bottom surface, and having a closed portion on the bottom thereof. A gas generator comprising: a driving agent accommodated in a cup. 14. The gas generator according to claim 13, wherein the opening of the holder is formed by a hole that decreases in diameter toward the cup. 15. The gas generator according to claim 13, wherein the rupture line is arranged such that a peripheral portion thereof is covered with a bottom portion of the holder and a central portion thereof is exposed from the opening. Characterized gas generator. 16. The gas generator according to claim 13, wherein the holder is fixed to the body together with the cup by overlapping and caulking. 17. An igniter having a header portion and a connector portion and having a rupture line in the header portion, a body attached to the connector portion side of the igniter, and an opening through which a flame from the igniter passes is provided on a bottom surface. A bottomed cylindrical holder having a closed portion on the bottom surface and having a closed portion attached to the igniter; a bottomed cylindrical cup mounted on the igniter; A gas generator comprising a driving agent to be driven.