JP2000168487A - Inflator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the scattering of broken pieces of a squib cup to a bag by forming, on the squib cup, a groove for breaking the squib cup into broken pieces of a size not passable of the hole of an injection part at ignition of an igniter. SOLUTION: A ring-like groove 171 having a diameter larger than the inside diameter of a base seat is formed on the end surface 11a of a squib cup 11, and the thickness of the thin part 171a of the groove 171 is set smaller than the thickness of the squib cup 11. When the squib cup 11 is broken by the pressure of the gas generated by the ignition of an igniter 12, the squib cup 11 is easily cut in the part of the groove 171. A broken piece 21 ruptured from the end surface 11a has a disc-like form. The diameter (r) of the groove 171 is designed so that the broken piece 21 has a size not passable of the hole of a screen (the hole of an injection part). According to such a constitution, the broken piece 21 can be surely prevented from being scattered to the back through the hole of the screen or the discharge port of a diffuser.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag inflator for protecting an occupant of a moving vehicle. In particular, the present invention relates to an inflator that prevents fragments of a squib cup from scattering at the time of ignition.

[0002]

2. Description of the Related Art Conventionally, as an example of an inflator, a hybrid type inflator has been known as disclosed in Japanese Patent Application Laid-Open No. 8-40178. In this inflator, a projectile is fired by ignition of the squib, which destroys the closing disk and ignites the ignition assembly. The gas generating agent stored in the gas generator is burned by the ignition of the ignition assembly, and is introduced into the high-pressure gas chamber in the inflator housing. As a result, a gas mixture of the high-pressure gas and the gas generated by the combustion of the gas generating agent passes through the broken closed disk,
It is injected from the injection unit toward the bag. The synergy between the gas generated by the gas generator and the high-pressure gas ensures a good gas supply rate to the bag.

As described in Japanese Utility Model Laid-Open No. 6-27379, a ring-shaped groove is formed on the upper surface of the squib so as to break when fired, and an annular restraining member having an opening on the upper surface is arranged in contact with the groove. Squib cups are also known (FIG. 8). In this case, a screen is provided on the outer peripheral portion of the inflator loaded with the squib, and the inflator is designed so that debris and the like separated by the ring-shaped groove are not scattered.

[0004]

However, Japanese Patent Laid-Open No.
In the inflator described in -40178,
The squib cup is filled with an igniting agent for firing a projectile, and the igniting agent is electrically ignited by a collision detection signal. Therefore, when the igniter is ignited, the pressure of the produced gas breaks the squib cup into small pieces, and the small pieces pass through the holes of the screen provided in the injection unit and fly into the bag. There was a problem that it would. In addition, the small pieces become hot due to the combustion of the igniting agent, and there is a possibility that the bag may be melted by touching the bag.

FIGS. 7A, 7B and 7C show a squib cup 119 used in a conventional inflator. The conventional squib cup 119 is designed so that several radial grooves 18 are formed on its end face, and when the igniter is ignited, rupture starts near the intersection of the radial grooves 18. FIG. 7D shows a state in which the squib cup 119 has burst. On the rupture surface of the squib cup 119, an end surface 20 of the squib cup which has been ruptured is formed, and a large amount of small pieces 209 are discharged.

In the case of the squib described in Japanese Utility Model Laid-Open No. Hei 6-27379 shown in FIG. 8, the ring-shaped groove must be smaller than the inner diameter of the pedestal. That is, in FIG. 8, the ring-shaped groove 98 is useless unless it is smaller than the inner diameter of the pedestal 95. Since the inner diameter of the pedestal of the current product is about 4 mm, the fragment (rupture disk) 91b has a smaller diameter. On the other hand, the hole diameter of the screen provided on the outer periphery of the inflator must be smaller than the size of the fragment 91b so that the fragment (rupture disk) 91b separated by the ring-shaped groove 98 does not enter the bag. Decreasing the screen hole diameter increases the flow path resistance, and the screen itself needs to be enlarged in order to increase the total area of the screen holes. Further, since the diameter of the groove 98 is smaller than the inner diameter of the pedestal 95,
In order to prevent the end face of the squib cup outside the groove 98 from being deformed due to the internal pressure at the time of breaking, the annular restraining member 81 is required to press down the portion 91c other than the rupture disk 91b which becomes a fragment. For this reason, it is necessary to create a strong squib holder 80 and to load and crimp the squib cup 91 into the hole 80a of the squib holder.
In addition, since an extremely thin insulating film is coated on the outside of the squib cup 91, there is a problem that if the insulating film is damaged at the time of assembling, defective insulation resistance occurs.

Accordingly, an object of the present invention is to prevent squib cup fragments from scattering into a bag during ignition in an inflator. Another object is to prevent the fragments from being scattered into the bag, thereby preventing damage to the bag and enabling normal deployment of the bag.
In addition, this aims to further protect the occupants completely. It is another object of the present invention to eliminate extra parts such as an annular restraining member and to facilitate manufacture.
Another object is to improve the reliability of the device.

[0008]

According to a first aspect of the present invention, there is provided an inflator having a squib cup filled with an igniting agent serving as a trigger for gas generation and an injection portion having a hole for injecting gas toward a bag. In the squib cup, a groove is formed in the squib cup to break the squib cup into fragments that cannot pass through the hole of the injection unit when the igniter is ignited. Because the groove is formed in the squib cup, the squib cup is broken in the groove when the igniter is ignited, and the squib cup can be broken into pieces of a pre-designed size. By forming the groove such that the fragments cannot pass through the holes of the injection unit, the fragments of the squib cup can be reliably prevented from passing through the holes and scattering into the airbag. As a result, the airbag can be properly deployed without damaging the airbag, and the occupant's safety is more appropriately protected.

The invention of claim 2 provides a squib formed by a squib cup filled with an igniting agent serving as a trigger for gas generation, a pedestal connecting the squib cup, and a hole for injecting gas toward the bag. In the inflator having an injection portion formed with, when the igniter is ignited, a groove for breaking the squib cup into fragments of a size that cannot pass through the hole of the injection portion is provided at a position of the squib cup equal to or larger than the inner diameter of the base. It is characterized by having been formed. Due to the formation of the groove, the squib cup is broken at the groove when the igniter is ignited, so that the squib cup can be broken into pieces having a pre-designed size. The fact that the groove is formed at the position of the squib cup that is equal to or larger than the inner diameter of the pedestal means that at least a part of the groove is formed at a position that is equal to or more than the inner diameter of the pedestal. In this way, by forming a groove so that fragments generated when the igniter is ignited and cannot pass through the hole of the injection unit, it is possible to prevent fragments of the squib cup from passing through the hole and scattering into the airbag. It can be reliably prevented. As a result, the airbag can be properly deployed without damaging the airbag, and the occupant's safety is more appropriately protected.

According to a third aspect of the present invention, in the inflator of the second aspect, a ring-shaped groove having a diameter larger than the inner diameter of the pedestal is formed in the squib cup. Since the ring-shaped groove is formed in the squib cup, the squib cup is broken by the ring-shaped groove when the igniter is ignited, so that the squib cup can be broken into pieces larger than the inner diameter of the pedestal designed in advance. By forming a ring-shaped groove so that fragments larger than the inner diameter of the pedestal cannot pass through the hole of the injection part, it is possible to reliably prevent fragments of the squib cup from passing through the hole and scattering to the airbag. can do. As a result, the airbag can be properly deployed without damaging the airbag, and the occupant's safety is more appropriately protected.

In the case of the first, second or third aspect of the present invention, the squib cup fragments are larger than the squib cup fragments generated by the conventional inflator. Therefore, the hole diameter of the screen hole (which constitutes an example of the hole of the injection unit) for preventing the debris from entering the bag can be made larger than the screen hole diameter of the conventional inflator.
This means that the gas flow resistance through the screen holes can be smaller than the gas flow resistance through the conventional inflator screen holes, and that the screen itself can be smaller than the conventional inflator. . In addition, since the squib cup is broken into large pieces, the pressure applied to the pieces increases, and the squib cup is easily broken in the groove. Therefore, there is no need for an extra part such as an annular restraining member for supporting the end face from the outside. In addition, since it can be easily broken, there is no need to assemble it with a strong squib holder, a space can be secured around the squib cup, and the insulating film on the surface of the squib cup is not damaged. .

According to the fourth aspect of the present invention, since the groove is formed on the end face of the squib cup, it is possible to easily form a groove which can be divided into fragments having a predetermined size, especially a predetermined size larger than the inner diameter of the pedestal. . In the invention of claim 5, the groove is
Since the end face of the squib cup is formed in a ring shape, a single piece having a size that cannot pass through the hole of the screen as the hole of the injection portion, particularly, a size larger than the inner diameter of the pedestal can be obtained. According to the sixth aspect of the present invention, the groove is formed in a ring shape on the end face of the squib cup, and a radial groove is further formed. Can easily be broken into pieces that cannot pass through the pedestal, and moreover, pieces that are larger than the inner diameter of the pedestal.

Further, according to the invention of claim 7, since the groove is formed in a ring shape on the side peripheral surface of the squib cup, the groove cannot be surely passed through the hole of the screen as in the invention of claim 5. Can be one piece. The invention according to claim 8 is characterized in that the jetting section has a screen in which a number of holes are formed, and a groove is formed in such a size that debris does not pass through the holes of the screen. Thus, the fragments do not pass through the holes of the screen and fly into the bag. According to a ninth aspect of the present invention, the inflator is provided with a high-pressure gas chamber filled with a high-pressure gas, a closing disk for isolating and shielding the high-pressure gas chamber and the injection unit, and a projectile for destroying the closing disk. This projectile is fired by the ignition of, and the closing disc is destroyed. or,
According to a tenth aspect of the present invention, the inflator is provided with a gas generator containing a gas generating agent and an ignition assembly for activating the gas generator. The gas generating agent of the vessel is ignited. In the type in which the projectile is fired by igniting the squib to the igniting agent, the squib cup fragments are further subdivided because the combustion output of the igniting agent is large. Therefore, the effect of using the present invention for this type of inflator is great, and the squib cup fragments in this type of inflator can be reliably prevented from scattering into the bag.

According to an eleventh aspect of the present invention, the depth d of the groove is defined as 0.1 <d / t <0.9, where t is the thickness of the squib cup before formation of the groove at the position where the groove is formed. That is, it is set so as to satisfy the relationship. When d / t is 0.1 or less, it is difficult to break, and when d / t is 0.9 or more, the strength at the time of non-rupture decreases, which is not desirable.

According to a twelfth aspect of the present invention, the diameter r of the groove formed in a ring shape is 0.63
<R / R <0.9. When r / R is 0.63 or less, stress based on the internal pressure at the time of ignition is unlikely to be generated effectively, and it is difficult to break.
When the ratio is 0.9 or more, it is difficult to form a groove due to, for example, rounding of a corner of the peripheral edge of the squib cup.

According to the thirteenth aspect of the present invention, in the case where a ring-shaped groove is formed on the end face of the squib cup, in addition to the condition of 0.63 <r / R <0.9 regarding the diameter r of the groove,
This is obtained by adding the condition of depth d: 0.1 <d / t <0.9. Therefore, as described above, effective breaking is performed in this range.

The invention according to claim 14 is characterized in that the end face is divided into four parts at the time of breakage by the groove. Thereby, the end face can be reliably and easily broken. Claim 15
The squib cup is characterized in that the squib cup is held in the internal space of the injection unit in a state where the end face and the side peripheral face are not in contact with each other. This facilitates assembling the squib cup to the inflator and improves the reliability because the insulating film formed on the side peripheral surface of the squib cup is not damaged. The invention of claim 16 is characterized in that the entire end face of the squib cup is not in contact with the pedestal. Also in this configuration, there is no need for a supporting part such as an annular restraining member for supporting the peripheral edge portion of the end face that is not broken from outside the end face.

[0018]

Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments. FIG. 1 shows an inflator 30 according to the embodiment.
Except for the squib cup of the present invention, which is the same as the conventional example (Japanese Patent Laid-Open No. 8-40178).
The inflator 30 is a hybrid inflator.
The inflator 30 is a bottle filled with high-pressure gas 31 to be supplied to an airbag (hereinafter simply referred to as a “bag”) when a vehicle collision is detected, that is, a gas generator that generates gas to be supplied to the inflator housing 32. Vessel 4
0. An area filled with the high-pressure gas 31 is a high-pressure gas chamber 33. The gas generator 40 contains a gas generating agent (propellant) 41 therein. The gas generator 40 increases the gas flow to the bag, and has, for example, a function of heating to expand the high-pressure gas 31 or a function of generating additional gas, or a function of adding both. It is.

Gas generating agent 4 stored in gas generator 40
1 uses a high-energy propellant (for example, nitramine), and the high-pressure gas 31 uses at least one inert gas (for example, argon).

The inflator housing 32 communicates with the gas generator 40, and the gas generator 40 is disposed inside the inflator housing 32. A flange 34 is provided at one end of the inflator housing 32,
At the other end, a hollow boss 50 is provided.
A hollow diffuser 51 is welded to one end of the zero.
The diffuser 51 is formed with a number of discharge holes 54 for blowing gas into the bag in order to give “non-thrust output”. Inside the diffuser 51, a cylindrical shape is formed in parallel with the cylindrical diffuser 51. A screen 52 is provided. The screen 52 is also provided with a large number of holes 53. A screen 52 having a number of holes 53,
The diffuser 51 having a large number of discharge holes 54 constitutes an injection unit. The screen 52 is provided to hold the particulate matter inside the inflator 30.

In order to initially retain the high pressure gas 31 in the inflator housing 32, the closing disc 60 is
Is welded to the boss 50. When gas release is required, a projectile 61 having a generally conical head is propelled through the closure disk 60. The projectile 61 is disposed on a guide 62 linearly disposed inside the diffuser 51 and has a ring 63.
Holds the initial position. Further, inside the diffuser 51, the squib 10 according to the main part of the present invention for firing the projectile 61 in the x-axis direction is fixed to the diffuser 51 by a holder 55.

When an ignition signal is applied to the lead pins 14 and 16 of the squib 10, the squib 10 is ignited, and the firing pressure of the squib 10 causes the projectile 61 to be fired in the x-axis direction to destroy the closing disk 60. Due to the destruction of the closing disk 60, the injection of the high-pressure gas 31 and the injection of the gas generated by the gas generator 40 from the discharge hole 54 of the diffuser 51 are performed.

An orifice sleeve 64 is welded to the ends of the closing disk 60 and the boss 50. The orifice sleeve 64 has a hollow cylindrical shape, and a plurality of orifice ports 65 are provided around the orifice sleeve 64. When the closing disk 60 is broken by the projectile 61, the high-pressure gas chamber 33 inside the inflator housing 32 communicates with the inside of the boss 50 and the diffuser 51 through the orifice port 65.

The housing 42 of the gas generator 40 is welded to an orifice sleeve 64. This housing 4
A sleeve 43 for holding a plurality of gas generating agents 41 is provided inside the inside 2. This gas generating agent 41 supplies a combustion product gas to increase the flow of gas to the bag when ignited. In addition, a screen 44 is provided between the housing 42 and the gas generating agent 41 to make the gas flow from the discharge nozzle 47 smooth.

A plurality of discharge nozzles 4 are provided on the side wall of the housing 42 of the gas generator 40 at predetermined intervals along the circumferential direction.
7 and 46 are provided. Due to the destruction of the closing disk 60, a flow of the high-pressure gas 31 is generated, and a mixed gas of the gas generated by the combustion of the gas generating agent 41 and the high-pressure gas 31 from the inside of the housing 42 is supplied through the orifice port 65 and the diffuser 51 to the outside. That is, the ink is discharged into the bag.

The gas generator 40 has an ignition assembly 70 for igniting the gas generating agent 41. The ignition assembly 70 is disposed between the projectile 61 and the gas generating agent 41, and is partially disposed in the housing 42 of the gas generator 40. The ignition assembly 70 is disposed within the orifice sleeve 64 and has an operating guide 73 engaged with the end of the orifice sleeve 64 and the inner wall of the gas generator 40 housing 42, and the operating guide 73 includes an operating piston 73. 74 are slidably disposed in the x-axis direction.
The working piston 74 is continuously provided with the rim 7 protruding in the x-axis direction.
The rim 75 is in contact with a plurality of squib primers 71. The firing squib 71 is held by a squib holder 76 and is in contact with a booster agent 72 as an activator held by a charge cap 77.

The operation of the inflator 30 is as follows. When a collision detection signal is applied to the lead pins 14 and 16 of the squib 10 from the collision detector, the squib 10 is ignited by an igniting agent 12 shown in FIG.
High pressure gas is generated. Thus, the projectile 61 is fired in the x-axis direction. The projectile 61 first breaks the closure disc 60 to open the passage between the inflator housing 32 and the bag. The projectile 61 continues to advance and finally strikes the working piston 74, and the projecting rim 75 attached to the working piston 74 causes at least one firing squib 71
Collide with As a result, the booster agent 72 is ignited, and then the gas generating agent 41 is ignited.

Mixing of the gas generated by combustion of the gas generating agent 41 in the housing 42 of the gas generator 40 with the high-pressure gas 31 is promoted. This mixed gas passes through an orifice port 65 provided on the side peripheral surface of the orifice sleeve 64, passes through the broken closed disk 60, and is discharged to the injection section. In the injection section, the gas passes through a number of holes 53 formed in the screen 52 and further passes through discharge holes 54 formed in the diffuser 51 and is discharged in the direction of the bag. As a result, the bag is deployed at an appropriate time and at an appropriate speed.

Next, the squib 10 which is a main part of the present invention will be described. FIG. 2 shows the structure of the squib 10 used in the inflator according to the embodiment. The squib 10 is a cylindrical squib cup 1 made of metal (for example, stainless steel) having an end surface 11a and a side peripheral surface 11b.
One. Inside the squib cup 11,
The igniting agent 12 is filled, and the igniting agent 12 is in contact with the filament 13 at the lower end. One end of the filament 13 is connected to a lead pin 14 to which a positive voltage is applied, and the other end is connected to a metal pedestal 15 having a ground potential. The pedestal 15 is connected to a lead pin 16 which is grounded. The lead pin 14 is insulated from the pedestal 15 by a hermetic seal 19, and the igniting agent 12 is provided in an internal space formed by the pedestal 15 and the squib cup 11.
Is filled. According to a collision detection signal output from a collision detector (not shown) (such as an acceleration sensor),
When a positive voltage is applied to 4, a current flows through the filament 13, the filament 13 generates heat by this current, and the igniter 12 is ignited instantaneously. The squib cup 11 is broken by the pressure of the gas generated by the instantaneous ignition of the igniter 12.

As shown in FIG. 3, a ring-shaped groove 171 having a diameter larger than the inner diameter of the pedestal 15 is formed on the end surface 11a of the squib cup 11, and the thickness of the thin portion 171a of the groove 171 is increased. Is thinner than the thickness of the squib cup 11. The inner diameter (the inner diameter of the end face) of the side peripheral surface 11b is R, the diameter of the ring-shaped groove 171 is r, the depth of the groove 171 is d, and the thickness of the end face 11a is t. In this embodiment, R = 7.3 mm, r = 5.9 mm, d = 0.1 m
m and t = 0.25 mm. Therefore, in this embodiment,
r / R = 0.81 and d / t = 0.4.

The relationship between R and r and the relationship between d and t preferably satisfy the following relationship.

0.63 <r / R <0.9 (1)

0.1 <d / t <0.9 (2) As described above, when the r / R is 0.63 or less, the stress based on the internal pressure at the time of ignition is unlikely to be effectively generated, and the fracture is caused. Becomes difficult. 0.9 or more is the radius of the squib cup
Due to processing and the like, it is difficult to form a groove. Further, if d / t is less than 0.1, it is difficult to break, and if d / t is more than 0.9, the strength at the time of non-breakage is undesirably reduced.

When the squib cup 11 is broken by the pressure of gas generated by the ignition of the igniter 12, the groove 1
It is easily cut at 71. The fragment 21 broken from the end face 11a has a disk shape as shown in FIG. In consideration of the equation (1), the groove 17 is formed so that the fragments 21 do not pass through the holes 53 of the screen 52.
Design a diameter r of 1. With such a configuration, the fragment 2
1 can surely be prevented from passing through the holes 53 of the screen 52 and the discharge holes 54 of the diffuser 51 and scattering into the bag.

Another example of the squib cup 11 is shown in FIG. As shown in FIG. 4A, a ring-shaped groove 172 is formed on the side peripheral surface 11 b of the squib cup 11. In this embodiment, the inner diameter (the inner diameter of the end face) R of the side peripheral surface 11b is 7.3 mm, the depth d of the groove 172 is 0.1 mm,
The thickness t of the side peripheral surface 11b is 0.25 mm. Even when the ring-shaped groove 172 is formed on the side peripheral surface 11b, it is preferable that the above-mentioned expression (2) is satisfied. The lower limit value of d / t is determined to be 0.1 as a condition that the stress in the axial direction of the side peripheral surface 11b is higher than the stress in the peripheral direction. Within the above range, the axial stress at the thin portion of the groove can be made larger than the circumferential stress by the internal pressure at the time of ignition, and the groove can be easily broken.

Since the thickness of this portion is smaller than that of the other portions due to the groove 172, the portion is easily broken at the portion of the groove 172 when the ignition agent is ignited. The pieces 22 broken from the squib cup 11 have a bottomed cylindrical shape as shown in FIG. The diameter of the fragments 22 is equal to the diameter of the end face 11a of the squib cup 11, and is naturally larger than the inner diameter of the pedestal 15. By making the diameter of the squib cup 11 larger than the diameter of the hole 53 of the screen 52, it is possible to reliably prevent the bottomed cylindrical piece 22 from passing through the hole 53 of the screen 52.

Another example of the squib cup 11 is shown in FIG. As shown in FIG. 5A, on the end surface 11 a of the squib cup 11, a ring-shaped groove 173 having an inner diameter of the pedestal 15 or more and two radially orthogonal grooves 18 are formed. As a result, when the squib cup 11 is broken, the end face 11a is made into four quarter-shaped pieces 231 and 232,
233, 234. Also in this case, the grooves 173 and 18 are formed so that the radius of each fragment is larger than the diameter of the hole 53 of the screen 52, so that the fragment 231 is formed.
To 234 can be reliably prevented from passing through the holes 53 of the screen 52.

FIG. 6 shows a modification of the squib cup 11. As shown in FIG. 6A, a horseshoe-shaped groove 174 is formed on the end surface 11a of the squib cup 11 at a position equal to or larger than the inner diameter of the pedestal 15. Thereby, when the squib cup 11 is broken, a part of the end face 11a is broken, and it is possible to form a part 24 of the squib cup end face that is not completely separated. Even if the part 24 of the end face is completely separated from the squib cup 11, the debris passes through the hole 53 of the screen 52 by forming the groove 174 so as to be larger than the diameter of the hole 53 of the screen 52. Can be reliably prevented. As in this modification, the groove formed on the end face 11a of the squib cup 11 can satisfy the gist of the present invention without being a closed ring.

As described above, in the present invention, the grooves are formed such that the fragments generated when the squib cup is broken do not pass through the holes of the screen. Therefore, the present invention is characterized by this squib cup, and the type of the inflator is not particularly limited as long as the squib has the squib. That is, the above-described embodiment shows the hybrid type in which the gas generated by the gas generating agent and the high-pressure gas are both used for deploying the airbag, but is not limited to this type, and the type having only the gas generating agent, It can be used for any type using only high-pressure gas. In short, any type of inflator may be used as long as the ignition of the igniter charged in the squib cup provides a trigger for gas injection. In addition, as the hole of the injection unit, the hole 5 of the screen 52 is used.
3 and the discharge hole 54 of the diffuser 51. In short, since it is used in the sense of a hole for injecting gas toward the bag, a hole other than the above-described embodiment may be used as long as it is a hole formed in an injection unit for injecting gas to the outside.

The formation of the grooves as shown in FIGS. 3 to 6 does not particularly hinder the firing of the projectile. With the shape shown in FIG. 5, the end face 11a of the inflator cup 11 is formed.
Is broken, so that there is no hindrance to the launch of the projectile, which is particularly effective for an inflator of the type having a projectile.

[Brief description of the drawings]

FIG. 1 is a structural view showing an inflator according to a specific embodiment of the present invention.

FIG. 2 is a configuration diagram showing a squib used in the inflator.

FIG. 3 is a configuration diagram showing a squib cup.

FIG. 4 is a configuration diagram showing another example of the squib cup.

FIG. 5 is a configuration diagram showing another example of the squib cup.

FIG. 6 is a configuration diagram showing a modification of the squib cup.

FIG. 7 is a configuration diagram showing a conventional squib cup.

FIG. 8 is a structural view showing a squib incorporated in a conventional squib holder.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Squib 11 ... Squib cup 11a ... End face 11b ... Side peripheral surface 119 ... Conventional squib cup 12 ... Ignition agent 13 ... Filament 14, 16 ... Lead pin 15 ... Base 171, 172, 173, 174, 18 ... Groove 19 ... Hermetic Seal 20: End face of ruptured squib cup 209: Strip 21, 22, 231, 232, 233, 234: Fragment 24: Part of end face of squib cup that is not completely separated 31: High pressure gas 32: Inflator housing 33: High pressure Gas chamber 40 gas generator 41 gas generating agent 42 housing 46 discharge nozzle 47 discharge nozzle 50 boss 51 diffuser 52 screen 53 hole 54 discharge hole 60 closing disk 61 projectile 64 orifice Sleeve 65: Orifice port 70: Ignition Assembly 71 ... Striking tube 72 ... Booster agent 73 ... Activating guide 74 ... Activating piston 75 ... Rim 76 ... Priming tube holder 77 ... Charging cap 80 ... Squib holder 80a ... Squib holder hole 81 ... Circular inhibitor 81a ... Aperture 82... Explosive charge 83... Explosive charge container 90... Squib 91. 92: ignition agent 93: filament 94, 96: lead pin 95: pedestal 98: groove 990: hermetic seal 991: spacer and sealing material

Claims (16)

[Claims] 1. An inflator having a squib cup filled with an igniting agent serving as a trigger for gas generation and an injection portion having a hole for injecting a gas toward a bag, wherein when the igniting agent is ignited, An inflator, wherein a groove for breaking the squib cup is formed in a piece having a size that cannot pass through a hole of the injection unit. 2. A squib formed by a squib cup filled with an igniter for triggering gas generation, a pedestal connecting the squib cup and the like, and an injection unit having a hole for injecting gas toward the bag. In the inflator having, when the igniter is ignited, a groove is formed at the position of the squib cup which is larger than the inner diameter of the pedestal and which breaks the squib cup into fragments having a size that cannot pass through the hole of the injection unit. An inflator characterized by: 3. The inflator according to claim 2, wherein the groove is formed in a ring shape having a diameter larger than the inner diameter of the pedestal. 4. The inflator according to claim 1, wherein said groove is formed in an end face of said squib cup. 5. The inflator according to claim 4, wherein said groove is formed in a ring shape. 6. The inflator according to claim 5, wherein said groove is formed in a ring shape, and further, a radial groove is formed. 7. The inflator according to claim 1, wherein the groove is formed in a ring shape on a side peripheral surface of the squib cup. 8. The sprayer according to claim 1, wherein the spraying unit has a screen having a large number of holes, and the groove is formed in such a size that the fragments do not pass through the holes of the screen. The inflator according to claim 7. 9. The inflator includes a high-pressure gas chamber filled with a high-pressure gas, a closing disk for isolating and shielding the high-pressure gas chamber and the injection unit, and a projectile for destroying the closing disk. The inflator according to any one of claims 1 to 8, wherein the projectile is fired by igniting the igniter to break the closing disk. 10. The inflator includes a gas generator containing a gas generating agent, and an ignition assembly for activating the gas generator. The ignition assembly is activated by the firing of the projectile, and The inflator according to claim 9, wherein the gas generating agent of the gas generator is ignited. 11. The depth d of the groove is 0.1 <d / t <0.9, where t is the thickness of the squib cup before formation of the groove at the position where the groove is formed. The inflator according to any one of claims 1 to 10, wherein 12. A diameter r of the groove formed in a ring shape.
Is 0.63 <r, where R is the inside diameter of the end face.
6. The relationship of /R<0.9 is satisfied.
Or the inflator according to claim 6. 13. The groove depth d is 0.1 <d / t <0.9, where t is the thickness of the squib cup before the groove is formed at the position where the groove is formed. 13. The inflator according to claim 12, wherein 14. The inflator according to claim 6, wherein the end face is divided into four parts by the groove at the time of breakage. 15. The squib cup according to claim 1, wherein the end face and the side peripheral face of the squib cup are held in a non-contact state in the internal space of the injection section. The inflator according to the paragraph. 16. The inflator according to claim 2, wherein the entire end surface of the squib cup is not in contact with the pedestal.