WO2001005633A1

WO2001005633A1 - Gas generator

Info

Publication number: WO2001005633A1
Application number: PCT/JP2000/004812
Authority: WO
Inventors: Yasuhiro Sugawara; Takashi Minamizawa
Original assignee: Nippon Koki Co., Ltd.
Priority date: 1999-07-21
Filing date: 2000-07-18
Publication date: 2001-01-25
Also published as: JP2001088653A

Abstract

An electric small gas generator used mainly as a seat belt pretensioner gas generator, comprising an ignitor (10), a body (40) disposed in contact with a connector part (13) side of a swelling part (12) of the ignitor (10), a bottomed tubular holder (30) having, in a bottom surface thereof, an opening part (31) allowing a flame from the ignitor (10) to be passed and disposed so as to cover the outer periphery of a header part (11) and the swelling part (12) of the ignitor (10), a bottomed tubular cup (20) having an inner peripheral side surface overlapped with the outer peripheral side surface of the holder (30) and also having a closed part (21) on the bottom surface thereof, and drive medicine (50) stored in the cup (20), wherein an opening end part (33) of the holder (30) and the opening end part (22) of the cup (20) are fixed by caulking after overlapped on the body (40) so as to hold the ignitor (10) by the holder (30) and the body (40) through the swelling part (12), closely fit the outer peripheral side surface of the holder (30) to the inner peripheral side surface of the cup (20) with no clearance, and form a drive medicine storage part (28) between the opening part (41) side of the holder (30) and the closed part (21) of the cup (20).

Description

Gas generator technical field

The present invention relates to an electric small gas generator mainly used for a gas generator for a seat belt pretensioner. Landscape technology

The seatbelt pretensioner plays a role of safely restraining the occupant (seatbelt wearer) with a seatbelt when receiving an abnormal impact such as a vehicle collision.

The gas generator (gas generator) used in this seatbelt pretensioner is designed to quickly and securely pull and fix the seatbelt in the event of an impact such as a vehicle collision as described above. It is important how quickly and surely the combustion gas for igniting the (gas generating agent) and driving the seat belt is generated.

Therefore, this gas generator receives the electric signal of the electric sensor of the collision detection system, first converts the electric energy into heat energy, and causes a igniting reaction from the heating part (squib or initiator); It is composed of components such as a body that couples with the igniter and holds the igniter, and a cup and the like that contains a driving agent that ignites in response to the ignition reaction of the igniter and generates combustion gas.

As a result, the pressure of the combustion gas of the driving agent contained in the power supply 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. It is taken and restrains the body safely.

Further, this gas generator is used for a seat belt pretensioner, but can be used for igniting a gas generating agent of a gas generator for an air bag as another use.

Japanese Patent Application Laid-Open No. Hei 10-210,900 describes that the ignition (igniter body) is A gas generator fixed to a body via a gas generator is disclosed. In this gas generator, the igniter (igniter main body 5) is mounted on a 0-ring seal 6 placed at the bottom of a neck 4 formed on a body (igniter support 2). One side (free end) of 4 is fixed to the body by caulking the enlarged central part of the igneous evening.

Further, the body (igniter support 2) has a circumferential groove (border lip 32) in the circumferential direction close to the neck 4 of the body. The flange of the cup (breakable case 13) in which the driving agent (ignition powder 14) is stored is placed in the groove, and the groove is crimped inward.

In addition, Japanese Patent Application Laid-Open No. Hei 4-270988 discloses a gas generator having a configuration that does not use an O-ring seal.

This gas generator contains a driving agent (ignition agent 44) in a cup (container 42), and further arranges a sheet 46 that covers the driving agent and separates the inside of the power supply from the ignition port. are doing.

Also, a disc-shaped plate 48 is provided on the connector side of the igniter (ignition member 50), and the flange (ring flange 36) of the cup (vessel 42) is placed thereon and welded to the plate. Further, the flange portion (ring flange 56) of the cup-shaped distribution casing 52 is superposed on the flange portion 36, and tightened and fixed by the body (holding body 62) and the pin 68. .

Also, Japanese Patent Application Laid-Open No. 61-41667 discloses a gas having a body forming an ignition receiver for holding the connector side of the ignition and holding the flange portion of the cup containing the driving agent. A generator is disclosed.

In this gas generator, the body (igniter carrier 4) has an axially projecting igniter receiving portion (igniter carrier portion 26), an expanded central portion (expanded central brim 28) An annular edge groove (annular groove 30) is formed on one side (end face) of the center in the outer direction, and a cup (propellant container 10) for accommodating a driving agent (propellant 54) is formed in the annular edge groove. The flange (container edge) is inserted, and it is caulked and fixed by the caulked portion (lip 32) together with the ring.

Also, Japanese Patent Application Laid-Open No. 8-184314 discloses that an electric signal of an electric sensor is received. An igniter for an air bag gas generator is disclosed in which a flame of an igniter is released from a fragile portion of a breakable tubular member by a gas pressure generated when the igniter is activated.

The igniter of this gas generator for airbags is composed of a squib (igniter) and an enhansa (powder) that are integrated into one, and the igniter (squib enhansa 14) is destroyed so as to cover the igniter. The cup is provided with a possible cup (destructible tubular agent 12), a flange 19 is formed on this cup, and this flange is placed on a collar 15 integrally formed with the squib enhanzer. It is fixed by the swaged part together with the 0 ring.

Further, the closed end 20 of the cup 12 is provided with a rupture portion (fragile portion). This break has a relatively thin closed end, for example 0.1 to 0.5 mm thick.

Gas generators, especially gas generators for seatbelt pretensioners (gas generators) have a limited number of places for accommodating the pretensioner (equipment) because they hold the body of the vehicle occupant with a belt, and depending on the manufacturer, The structure and installation of the pretensioner (device) are different.

Therefore, in the gas generator described in Japanese Patent Application Laid-Open No. H10-217900, in the cup, the driving agent contained in the cup is close to the constriction on the heating portion side of the igniter (igniter). The space between the header outer diameter and the cup inner diameter (blind space) or the amount of driving agent that enters the blind space varies depending on the installation direction of the gas generator, and the pressure characteristics during combustion of the driving agent may change. is there.

If a driving powder enters the blind space, it is mixed with the driving powder and ignited by the flame from the igniting evening. Ignition at the same time) but tends to ignite with a time delay compared to the explosive on the top of the header in the igneous evening, which has a considerable effect on the pressure characteristics o

This phenomenon occurs because the driving agent located in the blind space does not receive the flame propagation of the powdered ignition powder, so that combustion starts with a delay due to the flame propagation of the ignition powder that has ignited normally, and the pressure is delayed. And decline. Also, in order to fix the igniter, it is fixed by caulking with a neck extending from the body in a hollow cylindrical shape and an O-ring, and the flange portion of the cup containing the driving agent is placed in the annular edge groove of the body. It is necessary to perform caulking twice, caulking and fixing.

In addition, in the gas generator described in Japanese Patent Application Laid-Open No. Hei 4-270988, in order to maintain the igniting charge 44 and prevent moisture, the igniting charge of the press body in the cup must be covered with a sheet 46. No.

In addition, it is necessary to use a plate 48 or fix it with screws to hold the cup and the igniter, which requires a lot of man-hours.

Further, in the gas generator described in Japanese Patent Application Laid-Open No. 61-41667, the body is held in the shape of a step (taper shape) on the connector side of the igniter. There are difficulties with the necessity and retention of the sign itself on the driving drug side.

Further, 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 risk that broken fragments may be detached at the combustion pressure of 1).

Note that the required output of the seatbelt pretensioner is not constant, and the required pressure varies depending on the vehicle type, module type, etc.

Therefore, gas generator manufacturers need to cope with the various outputs required, and may adjust the amount of driving chemical for that purpose.

Also, even if the thermodynamic energy required by the pretensioner is constant, there are modules that require a fast rising pressure and vice versa. And the ratio of the ignition charge. Driving agents usually consist of propellant and igniter.

If a fast start-up pressure is required, it is necessary to add a large amount of priming charge, but since the priming charge has a smaller gas volume than the propellant charge, the amount of the propellant charge cannot be reduced so much.

As a result, the amount of drug and the filling volume of the driving drug as a whole change.

For these reasons, multiple specifications must be prepared to meet customer requirements. For this reason, in the conventional type without the filling rate adjustment structure, it was necessary to prepare multiple forceps to make the optimum filling rate. Disclosure of the invention

An object of the present invention is to provide a gas generator that prevents a driving agent from entering a blind space.

Another object of the present invention is to provide a gas generator that can be easily assembled and securely fixed.

Still another object of the present invention is to provide a gas generator which can easily ensure 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 at a combustion gas pressure.

A gas generator according to the present invention comprises: a igniter having a header portion and a connector portion, wherein a header portion and a connector portion are connected via a bulge portion; and a connector of the bulge portion of the ignite portion. A body having an opening on the bottom surface through which the flame from the igniter passes, and a bottomed cylindrical member arranged to cover the outer periphery of the header and bulge of the igniter It has a holder, a bottomed cylindrical power cup having an inner peripheral side surface overlapping with the outer peripheral side face of the holder and having a closed portion on the bottom surface, and a driving agent accommodated in the power cup.

In this gas generator, the open end of the holder and the open end of the cup are overlapped on the body and fixed by caulking, so that the sign is held between the holder and the body via the bulging portion. The outer peripheral side surface of the holder and the inner peripheral side surface of the cup are in close contact with each other without any gap, and a driving medicine accommodating portion is formed between the opening side of the holder and the closed portion of the cup.

Here, the body includes, for example, a lignae receiving portion formed of a wall surface in contact with a wall surface on the connector portion side of the bulging portion of the lignay, a flange provided outside the opening end of the holder, and the force transmitting member. An annular edge groove portion having an edge portion which can be fixed by caulking and fixing a flange portion provided outside the opening end portion of the opening is integrally formed.

In addition, the flange portion of the flange portion provided outside the opening end portion of the holder includes, for example, Silicone sealant is applied.

Further, for example, a silicone sealant is applied to the igniter receiving portion of the body.

In the driving medicine container, the filling rate of the driving medicine can be set to 80% to 90%, for example, by replacing the holder.

Another gas generator according to the present invention includes an igniter having a header portion and a connector portion, a body attached to the connector portion side of the igniter portion, a closing portion on the bottom surface, and a rupture line provided on the bottom surface, It has a bottomed cylindrical forceps attached to the igniter and a driving agent contained in the forceps.

Here, the rupture line forms, for example, 30% to 50% of the remaining plate thickness with respect to the bottom plate thickness.

Another gas generator according to the present invention includes: a igniter having a header portion and a connector portion and having a rupture line in a header portion; a body attached to the connector portion side of the igniter portion; It has a closed-end portion, a bottomed cylindrical cup attached to the igniter, and a driving agent contained in the cup.

Here, the rupture line forms a remaining thickness of 30% to 50% with respect to the thickness of the bottom surface. Another gas generator according to the present invention includes: a 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 bulge portion of the igniter. A body disposed in contact with the connector portion side of the connector, a closed-bottomed cup having a closed portion on the bottom surface and attached to the igniter, and a driving agent accommodated in the cup.

Another gas generator according to the present invention includes: a igniter having a header portion and a connector portion and having a rupture line in a header portion; a body attached to the connector portion side of the igniter portion; It has a closed part, has a rupture line on the bottom surface, and has a bottomed cylindrical cup attached to the igniter, and a driving agent contained in the cup.

Another gas generator according to the present invention includes: a igniter having a header portion and a connector portion, wherein the header portion and the connector portion are connected via a bulging portion; and a connector portion side of the igniter. With a body attached to the A rupture line is provided on the bottom surface, and it has a bottomed cylindrical cup that is attached to the igniter, and a driving agent that is housed in the forceps.

Another gas generator according to the present invention includes: a igniter having a header portion and a connector portion and having a rupture line in a header portion; a body attached to the connector portion side of the igniter portion; A bottomed cylindrical holder arranged to cover the outer periphery of the header portion and the bulging portion of the igniter and having an opening at the bottom surface for allowing the flame from the evening to pass, and a closed portion at the bottom surface; It has a bottomed cylindrical zipper that is attached in the evening, and a driving agent that is housed in this zipper.

Here, the opening of the holder is constituted by, for example, a hole which is reduced in diameter toward the cup.

Further, the rupture line is arranged, for example, such that its peripheral edge is covered by the bottom of the holder and its center is exposed from the opening.

In addition, the holder is fixed to the body by, for example, overlapping the cup with the cup.

Another gas generator according to the present invention includes: a igniter having a header portion and a connector portion and having a rupture line in a header portion; a body attached to the connector portion side of the igniter portion; It has a bottomed tubular holder that has an opening on the bottom surface to allow the flame from the evening to pass and covers the outer periphery of the header of the igniter, and has a closed part on the bottom and is attached to the igniter. It has a bottomed cylindrical cup and a driving agent contained in the forceps. BRIEF DESCRIPTION OF THE FIGURES

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

Figure 2 shows a cross section of the igniter in Figure 1.

FIG. 3 is a cross-sectional view of the cup in FIG.

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

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

FIG. 6 is a top view of a break (rupture line (tea line)) formed in the cup in FIG. FIG. 7 is a cross-sectional view taken along line BB of FIG.

FIG. 8 is a cross-sectional view of the holder of FIG.

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

FIG. 10 is a cross-sectional view relating to the pressure resistance of the body in FIG.

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

FIG. 12 is an explanatory diagram showing an outline of the 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 in which the conventional gas generator is turned in each direction. FIG. 15 is a graph showing the results obtained from FIG. 13 and FIG.

FIG. 16 is a graph showing the results of an experiment in which the gas generator according to the present embodiment and the conventional gas generator were operated five times under a certain condition to determine whether output variation occurred.

FIG. 17 is an explanatory diagram showing a state in which a tear line (tea line) of the cup is subjected to a breaking pressure.

Figure 18 is a graph showing the relationship between the tear line rupture of the cup (the tear line) and the breakthrough.

FIG. 19 is an explanatory view showing a broken state of a tear line (tea line) of the cup. FIG. 20 is an enlarged explanatory view showing a rupture state of a tear line of the cup of FIG.

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

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

FIG. 23 is an explanatory view showing the ultrasonic welding process of the igniter shown in FIG. FIG. 24 is a sectional view of the holder in FIG.

FIG. 25 is a cross-sectional view of the holder in FIG.

FIG. 26 is a cross-sectional view of the holder in FIG.

FIG. 27 is a cross-sectional view of the holder in FIG.

FIG. 28 is an overall sectional view showing a gas generator according to another embodiment of the present invention. FIG. 29 is a cross-sectional view showing an insertion type holder used for the gas generator in FIG.

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 the relationship between the withstand pressure cross-sectional area and the body burst pressure.

FIG. 32 is 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 the pressure waveform of the burst test. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described based on embodiments shown in the drawings.

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

The gas generator 1 according to the present embodiment includes a igniter 10 serving as the first ignition means, a cup 20 containing the driving agent 50, and a header portion of the igniter 10 arranged in the cup 20. 1 Holder 30 fitted to 1 side, body 40 that receives and holds connector 13 side of igniter 10, and holder 30 into annular edge groove 42 of body 40 The flange portion 34 of the cup 20 and the flange portion 23 of the cup 20 are overlapped and inserted, and caulked and fixed by the edge portion 43 of the annular edge groove portion 42.

As shown in Fig. 2, the igniter 10 generates heat from two lead pins 15 and 16 molded with a resin plug 14 and a bridge wire electrically connected to one side of these pins. A part 17, an igniter 18 charged on the heating part 17, and the igniter 18 are accommodated and placed on the step part 14 a of the resin plug 14, and the resin plug 14 is placed. And a cap 19 to be fitted and fixed.

The outer shape of the igniter 10 is, through a bulging portion 12, a header portion 11 having a heating portion 17 and an igniter 18, and a connector portion 13 electrically connected to the header portion 11. It has a connected shape.

The bulging portion 12 has tapered wall surfaces 12a and 12b respectively toward the header portion 11 and the connector portion 13 side.

As shown in FIGS. 1 to 7, the cup 20 has an aluminum alloy bottomed cylindrical shape having a closed portion 21 on the bottom surface closed on one side and an open end 22 opened on the other side. Body.

A flange portion 23 is formed on the outer periphery of the open end portion 22 so as to be turned up to approximately 90 degrees.

As shown in FIGS. 3 to 6, the cup 20 is provided with two chamfered portions 25 which are narrower than the body portion 24 on the closed portion 21 side of the body portion 24. I have. Further, a break 26 is formed in the closed part 21. As shown in Fig. 6, the fractured portion 26 has a length radially from the central axis of the cup 20 in the circumferential direction, a length of 60 to 70% of the inner diameter of the bottom surface, and a remaining thickness of the bottom plate. Eight 50% burst lines (tear lines) 26a are provided.

The number of rupture lines (tea lines) 26a is eight in the present embodiment, but preferably six to eight lines are suitable from the viewpoint of preventing separation of fragments.

Further, the remaining plate thickness of the rupture line (tear line) 26a is 0.3 mm in the present embodiment, but preferably 0.2 to 0.3 mm from the viewpoint of strength (the thickness with respect to the closed plate thickness). Rupture line (Tear line) The thickness is 30-50%.

As shown in FIGS. 1, 2, and 8, the holder 30 has an opening 31 on one side through which the flame of the igniter 10 passes, and an opening 3 on the other side into which the igniter 10 fits. 2 is a bottomed cylindrical body made of aluminum.

A flange portion 34 is formed on the outer periphery of the end portion 33 of the opening portion 32 into which the signature 10 is fitted so as to be turned up to approximately 90 degrees.

The interior of the holder 30 is continuous with the opening 31 and has a concave portion 35 for accommodating the header portion 11 of the igniter 10, and the inner portion of the holder 30 is connected to the concave portion 35 and has a It has a tapered wall surface 36 that abuts the tapered wall surface 12a. The wall surface 36 is continuous with the opening 32. From the boundary between the wall surface 36 and the opening portion 32 to the opening portion 32, the bulging portion 12 of the igniter 10 is accommodated. In addition, the wall surface on the peripheral edge side of the opening 31 constitutes the pressing portion 3la.

As shown in FIGS. 1 and 2, the body 40 has an opening 41 on one side into which the igniter 10 can be inserted, and an opening 45 on the other side into which the connector of the electric sensor can be fitted. It is a cylindrical body made of aluminum alloy.

The outer periphery of the opening 41 into which the signature 10 can be inserted is provided with a holder 30 holder. An annular edge groove portion 42 having an edge portion 3 which can fix the flange portion 23 of the cup portion 20 by overlapping the flange portion 24 with the flange portion 34 is formed.

Also, the body 40 has a wall surface 1 on the connector side of the bulge 12

A igniter receiving portion 44 composed of a wall surface in contact with 2a is formed.

The driving medicine 50 is filled in a driving medicine accommodation part 28 formed between the cup 20 and the holder 30. 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.

Further, for the driving agent 50 in the cup, the amount and the composition ratio are determined in order to conform to a predetermined pressure characteristic, and the driving agent filling rate in the cup 50 is determined. In the present embodiment, the driving agent filling rate is set to 88%.

The driving agent 50 receives the flame from the igniter 10 and is ignited and burned by the powdered ignition agent, and ignites and burns the granular propellant, and this combustion gas is used in the drive unit (in the module). Released to

Further, in the present embodiment, the powdered and granular mixture was loaded in the cup 20 as it was, but this mixture was mixed with a gas generating agent in a pellet (tablet) having a thickness of 3 mm x 3 mm. Can also be used.

The gas generating agent is a mixture of a gas generating base composed of guanidine of 5,5,1-bis-1H tetrazolamine salt and a nitrate of an inorganic metal salt as an oxidizing agent.

Next, a method for 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 ①:

On the inner surface of the closed part 21 of the cup 20, the remaining plate thickness is 0.

Eight pieces of 3 mm x 8 mm in length and rupture lines (tea lines) 26 a are formed.

This rupture line (tea line) 26 a ruptures the inner surface of the cup 20 (tea line)

It is processed to a certain thickness by covering over the mold for forming 26a.

As a result, the notch is formed on the inner surface of the cup as shown in Figs. Therefore, the remaining thickness of the cup is 0.3 mm.

Next, a predetermined amount of a driving agent 50 that is a mixture of a powder ignition powder and a granular propellant is filled with the closed part 21 of the cup 20 facing downward.

Assembly process ①:

Insert the holder 30 through the opening 22 of the cup 20 and stop the insertion when the flange 23 of the cup 20 and the flange 34 of the holder 30 overlap.

At that time, as shown in FIG. 8, a silicone sealant 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.

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.

Assembly process ③:

Insert the header 10 into the opening 30 of the holder 30 with the header 11 side first, and mount the header 11 in the recess 35 of the holder 30.

At that 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.

For example, as shown in FIG. 22, the joining surface between the resin plug 14 and the cap 19 is ultrasonically welded w in the signature 10.

Figure 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.

Then, the two lead pins 15 and 16 are molded, the resin plug 14 to which the heating part 17 is connected is placed on the cap 19, and inserted into the cap 19 while being vibrated by the horn 62.

Then, when the cap 19 and the resin plug 14 are in close contact with each other, the vibration by the horn 62 is stopped.

As described above, the igniter 10 shown in FIG. 22 is manufactured. Assembly process ①:

A silicone sealant 39 is applied to the tapered wall surface 12 b of the igniter 10.

At that time, the silicone sealant 39 enters the gap between the tapered wall surface 12b and the holder 30 extending to the bulging portion 12 of the igniter 10 and stops in the bulging portion 12 and is further applied. You.

Assembly process ①:

Insert the body 40 from the connector 13 of the igniter 10 into the connector 13 of the igniter 10. I do.

At this time, the flange portion 34 of the holder 30 and the flange portion 23 of the cup 20 are inserted into the annular edge groove portion 42 of the body 40.

Assembly process ①:

Then, by crimping the edge 43 of the annular edge groove 42 so as to bend inward, the cup 20 and the holder 30 are fixed, and the igniter 10 is simultaneously held and fixed, thereby generating gas. Container 1 is assembled.

Here, regarding the filling rate of the driving agent 50 in the cup 20, the amount and component ratio of the driving agent 50 in the cup 20 are determined in order to match a predetermined pressure characteristic. The space between the opening 31 and the upper surface of the circumference (the driving medicine container 28) is set at a predetermined interval.

Next, the function (action) according to the operation of the gas generator 1 according to the present embodiment will be described. First, the electrical signal from the connector 13 generates heat in the heat generating portion 17 of the igniter 10, igniting the igniter 18 in contact with the heat generating portion 17, and causing the flame to ignite.

0 rupture line (tear line) on the upper surface of the header part 1 1 1 9 a Breaking the a and proceeding in the axial direction, passing through the opening 3 1 of the holder 30 and the driving medicine contained in the cup 20 50 To ignite. At that time, first, the powdery ignition powder of the driving powder 50 is ignited, and almost simultaneously, the granular propellant is ignited.

In addition, the igniting agent of the driving agent 50 burns the propellant and the initial pressure (1

~ 2 ms). Then, when the combustion gas of the driving agent 50 rises to a certain pressure in the cup 20, a rupture line (tea line) 26 of a break 26 formed on the upper surface of the closed portion 21 of the cup 20 26 a Is broken and the combustion gas is released into the module.

Also, the reaction of the combustion gas pressure (internal pressure) causes the igniter 10 to produce a stress on the body 40 side.

At this time, since the igniter receiving portion 44 of the body 40 has a tapered shape, as shown in Fig. 10, the shearing surface has an angle with respect to the direction of the pressure load, and Compressive stress acts on the surface, and this compressive stress increases the frictional resistance inside the material of the body 40 (aluminum alloy) and acts as a reaction force against the shear stress caused by the pressure (internal pressure) of the combustion gas.

Therefore, it becomes stronger than the simple shear stress as shown in Fig. 11, and the pressure strength of the body increases. FIG. 11 shows a conventional gas generator 100.

The experimental results regarding the compressive strength are shown in “Experimental examples” below.

Fig. 12 shows the outline of the tank pressure test equipment for the tank pressure test. With this device, the gas generator A and the pressure sensor B can be attached. Volume 10 c c Tank C was used to measure the internal pressure.

1. Install gas generator A and pressure sensor B in 10 cc tank C.

2. Pressure sensor B is connected to measuring instrument (analyzing recorder) D, gas generator A is connected to ignition power supply E, and measuring instrument D is connected to ignition power supply E.

3. When a voltage is applied from the ignition power supply E, the gas generator A is ignited and the pressure in the lOcc tank C increases. At this time, the measuring device D senses the voltage from the ignition power source E and starts measuring the pressure in the 10 cc tank C.

4. The measured data is expressed 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, upward and downward directions. FIG. 14 shows a conventional gas generator 100 in which a sufficient filling rate cannot be secured due to the presence of a blind space, in which the respective gas generators are arranged in the horizontal, upward and downward directions.

Figure 15 shows the results of installing and operating gas generators 1 and 100 in each direction. You. As is evident from Figure 15, there was a large difference between the tank pressure beak and the pressure peak time.

In the gas generator 1 according to the present embodiment, the rising pressure at the time of ignition was fast, and the pressure peaked at 9 ms. There was no problem with the horizontal, upward and downward sunset pressure differences.

However, in the conventional gas generator 100, the pressure at the start of the initial operation is slow, and the peak pressure of the tank is as slow as 14 ms. Also, when looking at the tank pressure of 5 ms, the difference between the horizontal, downward, and upward directions shows large fluctuations, indicating an unstable output. The propellant in the driving agent 50 has a significantly different burning rate depending on the pressure at the time of combustion.Therefore, the magnitude of the initial pressure causes a difference in the amount of gas generated per hour during the combustion. Even if the same, the tank pressure (absolute pressure) will change.

In addition, in the conventional gas generator 100, (1) 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 addition, when facing upward, the distance between the ignition surface of the ignition and the charging surface of the drive from the upper surface of the header of the ignition causes a delay in ignition. For this reason, if a sufficient filling rate cannot be ensured, the distance between the flame surface and the filling surface increases, which causes ignition delay.

Furthermore, in the case of (3) downward, ignition delay does not occur because 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 ignition. In the conventional gas generator 100, the driving pressure penetrates more into the blind space 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 were operated five times under certain conditions to determine whether output variations occurred. .

The certain conditions are specifications in which the drug type, drug quantity, filling rate, and other parts (ignite, body) are the same. Consideration 2:

In the gas generator 1 according to the present embodiment, there is no difference in the maximum pressure at the peak of the tank pressure for all five times, and the combustion pressure is stable.

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, the amount of the driving agent in the cup is determined in order to meet a predetermined pressure characteristic, and the amount and the component ratio are determined, and the filling ratio of the driving agent in the cup is determined.

Note that the outer diameter and length of the cup 20 are almost standard among manufacturers, so to obtain the required high-output and low-output pressure characteristics, change the cup shape (length, etc.). Instead, the volume of the drug can be adjusted to the optimum filling rate (80% to 90%) by replacing the holder 30.

That is, the length of the holder 30 is adjusted so as to achieve a predetermined filling rate of the driving agent 50, and the pressure is adjusted to a predetermined pressure characteristic. As a result, it is possible to maintain the pressure characteristics by adjusting the holder 30 without changing the outer diameter and length of the cup in response to changes in the amount of the driving agent in the cup 20, and to replace the igniter 10 with the body 4. Further, it is possible to hold the pressure resistance together with 0.

In addition, an annular edge groove 42 is formed in the body 40 that holds the connector 13 side of the bulging portion 12 of the signature 10, and the flange edge 3 4 of the holder 30 is formed in the annular edge groove 42. And the flange 23 of the cup 20 are placed on top of each other, and the edge 43 of the annular edge groove 42 is bent inward so that it is fixed by caulking. By this caulking process, the body 40, the igniter 10 and the holder 30 can be securely fixed and held physically.

As a result, the igniter 10 is positioned at the axial and radial positions of the body 40, and the dimensional accuracy can be increased.

Also, since the o-ring is not used, the lignae 10 and the body 40 are in direct surface contact, and when the lignae 10 is fixed, no local stress is applied to the lignae 10.

Further, the pressure resistance of the body 40 can be increased with respect to the pressure load on the body 40 due to the operation of the ignition unit 10. In addition, a rupture portion 26 ruptured by the combustion pressure of the driving agent 50 in the cup 20 has a predetermined depth of 6 to 8 in a circumferential direction (radially) from the center axis of the closing surface 21 of the cup 20. And a rupture line (tear line) 26 a having a predetermined length, so that when the rupture portion 26 ruptures due to internal pressure with the combustion of the driving agent 50 and releases gas into the module, The rupture line (tear line) 26a of the slab is sheared from the central axis, and fragmentation by the rupture line (tear line) 26a does not occur. The rupture line (tea line) 26 a that does not separate from the fragments is related to the thickness of the closed surface 21 of the cup 20 and the remaining thickness of the rupture line (tea line) 26 a, and the thickness of the closed surface 21 The thickness of the tear line 26a is more preferably in the range of 30 to 50%.

Here, the rupture line (tea line) 26a will be described in detail.

In the present invention, due to the gas pressure, the corner of the closed portion 21 of the cup 20 is not sheared (opened out), and the rupture line (tea line) 26 a formed in the closed portion 21 is broken. It has a feature in that it has an open portion without shards of the broken portion at the time of breaking. That is, the object is to prevent foreign matter from scattering from the broken portion during operation.

With conventional gas generators, it is not sufficient to prevent foreign matter scattering for the following reasons.

1) The dimensions are not set according to the processing method of aluminum lip.

2) The rupture line (tear line) depth that matches the thickness of the side cylinder surface and bottom surface of the aluminum cup is not secured.

Therefore, in the conventional gas generator, the measures for preventing the scattering of foreign matters are not perfect, and there is a risk that rarely, parts fragments may be released.

In the present invention, this problem has been solved by taking the following solution. 1) Bottom shape of aluminum cup

The processing method of the aluminum cup is generally forging or drawing. In this case, the thickness of the bottom of the cup becomes thicker than the thickness of the side cylinder surface, and the boundary between the bottom surface and the side cylinder surface (R portion at the bottom of the cup) is the weakest point.

If the pressure is static, the bottom surface and the side cylinder surface will deform (swell), and then the side cylinder surface will crack and the container will break.

In the gas generator of the present invention, the pressure is a dynamic pressure having directivity, and Because it is constrained by the inner wall of the joule, breakage from the R section is inevitable.

A rupture line (tear line) is carved as a countermeasure for this, but it has been confirmed that the bottom surface swells immediately before the rupture line (tear line) is released, and that considerable stress is applied to the R section. . Therefore, even if the rupture line (tear line) is opened, the R section is torn by the movement of the rupture line (tear line) (reaction to open). Therefore, it is important to strengthen the R part, and increasing the R as a method is highly effective. 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 the present embodiment, in the cup drawing process of the material plate thickness t: 0.6 mm and the outer diameter of 0.13.6 mm, the outside radius R of the bottom surface is secured to 0.8 mm or more. At this dimension, the bottom will not scatter as long as the tear line design is appropriate.

2) Depth of burst line (tea line) (remaining thickness)

For the same reason as in the previous section, if the depth and length of the rupture line (tear line) are not optimized, the rupture line (tear line) may be scattered.

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 the optimum thickness was 50% or less.

Also, the length of the rupture line (the tear line) (diameter of the circumcircle of the rupture line (the tear line)) has an optimum diameter with respect to the diameter of the bottom surface that receives the internal pressure. It turned out to be optimal.

In the present embodiment, the length of the rupture line (tea line) 26a is set to 8 mm. This is 65% of the bottom inner diameter of 0.12.4 mm.

Next, due to the gas pressure, the corner of the closed portion 21 of the cup 20 is not sheared (opened out), and the rupture line (the tear line) 26 a formed in the closed portion 21 is broken. The open part where there is no debris scattering at the broken part will be further described.

1) Burst line (Tear line) Break pressure calculation

The closed part 21 of the cup 20 deforms into a sphere when subjected to internal pressure, as shown in FIG. 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, find the maximum deflection when the elongation reaches the limit of the material. The dimensions and elongation are determined as follows.

Bottom inner diameter: s

Curvature radius during deformation: r

Deformed arc length: L

Inner angle of arc during deformation: Θ

Deformation amount: h

Material elongation: £

From the arc formula and material elongation, the following formula is established.

h = S / 2-t a n 0/4 · · · (1) (arc formula)

S = r · s 1 τιθ / 2 · · · (2) (arc formula)

L = r 6 · · · (3) (arc formula)

L = S (1 + £) · · · (4) (Elongation formula)

The following equation (5) is obtained from equations (2) to (4), and 0 can be calculated.

s i = {1 / (1 + £)}-Θ / 2 · · · (5)

By substituting 0 obtained by equation (5) into equation (1), the deformation amount (deflection amount) h at the limit of material elongation can be obtained.

By substituting the obtained h into the equation for the deflection of the disk in the following equation (6), the rupture pressure at the rupture line (tea line) can be obtained.

P = 64 D h / a ⁴ (6)

Where: Re: Poisson's ratio

a: radius of the disk

D: Rigidity of the disk (D = E t ³ (l— ^{2 2} ) / 1 2)

E: Coefficient of sex

t = disk thickness

2) Calculating the bottom dropout (disk dropout)

Using the following equation (7), which is the shear load equation for the disk, determine the pressure when the cup bottoms out.

Ρ = 4 τ t / d (7)

Here, each symbol is as follows. T: Shear stress

d: diameter of the disk

t: Thickness of the disk

3) Rupture line (Tear line)

Here is an example of the contents calculated in 1) and 2).

Table 18 shows the values of equations (6) and (7) as shown in Table 1, and Fig. 18 shows a graph with the rupture line (tear line) remaining thickness on the X axis.

The bottom line in the graph is the value when the cup bottom plate thickness is 0.5 mm. The point where the two lines intersect is the boundary between whether the rupture line (tear line) 26a breaks or the bottom comes off. Rupture line (Tear line) In a region where the rupture pressure is lower than the bottom pressure, when pressure is applied, the rupture line (Tear line) 26a breaks first.

Next, a description will be given of the absence of scattered fragments at the fractured portion when the rupture line (tea line) 26a fractures.

1) Rupture line (tea line) 2 6 a

Consider the number of rupture lines (tear line) 26 a and the fragments (rupture line (tear line)) scattering during operation.

When the gas generator is activated, the rupture line (tear line) 26a is broken by internal pressure, dividing the bottom of the cup 20 into a plurality of sectors.

If the internal angle of this sector is large, the elongation of the material at the time of unfolding becomes the limit, and the area of breakage at the bend increases. On the other hand, if it is too small, all the lines cannot be broken, and uneven development is not preferable.

Therefore, there is an optimum number of the inner corners of the fan shape when deployed, that is, the number of rupture lines (tea lines) 26a for preventing foreign matter scattering. 1) 1) Rupture line (Tearline) 26: Calculation of the fracture rate of 6a

Figs. 19 and 20 show the state when the tear line 26a is torn and the closed surface 21 of the cup 20 is unfolded.

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

dZ2 = d, / 2—R cos 45. = 6.5 6 6 (mm) · · · (8) Outer diameter of force loop: d '= 1 3.6 (mm)

R part:: = 0.8 (mm)

The deployment distance of the bend is given by the following equation (9).

A = (d / 2). (1-cos Θ / 2) (mm) (9) Here, when the closed surface 21 of the cup 20 is expanded and bent, Assuming that the extending part is only the R part, the original length L of the extending part is

TTR / 2 = 1.257 (mm).

Therefore, the elongation ε of the bent portion is expressed by the following equation (10).

£ = Δ L / L = (d / 7rR). (1-cos 0/2). ■. (10) By transforming equation (10) with respect to Θ, the following equation (11) is obtained.

Inner angle of elongation of £: 0 = 2 cos— — £ 7rR / d) (°) · ■ · (1 1) Substituting the elongation of the material used in equation (1 1) does not break the material The interior angle of the sector connected by is required.

Inner angle of connected sector: θ '— Eq. (1 1) with ε substituted

Material elongation: ε '

Therefore, the breaking ratio of the circular arc part at the time of unfolding is as shown in the following formula (12).

Break rate: B = (l-0, / 0) x l O O (%) · · · (1 2)

1-2) Rupture rate of rupture line (tear line) and foreign matter scattering

According to the experiment, the aluminum alloy cup 20 (material: A1500H24, elongation: 9.5%) of the present embodiment shows a rupture line (tea) when the breaking ratio exceeds 75%. (Line) 26 a may be scattered. At that time, the number of tear lines 26 a was four. In addition, if the number of tear lines (tea lines) 26a exceeds 8, lines that do not break will be generated, so increasing the number further will not only be meaningless, but will also result in uneven distribution of breaks. Not preferred.

Therefore, the number of rupture lines (tear lines) 26a should be 4 to 8 in order to prevent foreign matter scattering.

However, this number is based on the case of using the aluminum cup material of the present embodiment, and when the material changes and elongation changes, the breaking ratio is reduced to 75% or less based on the concept of the previous section 1-1). Should be set.

Table 2 shows the difference depending on the material used when the minimum number is the limit of the breaking ratio (around 75%) and the maximum number is eight.

Table 2

Next, the relationship between the rupture line (tea line) plate thickness and the rupture pressure is shown in Fig. 21.

The rupture line (tear line) The scattering condition changes when the depth of 26a is between 0.3 mm and 0.4 mm. At 0.4 mm and 0.5 mm, the bottom is scattered, and the bottom R is broken despite the provision of a rupture line (tear line) 26a. This suggests the need to optimize the depth of the tear line 26a.

Next, the rupture line (tea line) 19a of the cap 19 of SIGNAY 10 will be described in detail.

The basic technical concept is the same as the tear line 26a of the cup 20. In the case where there is a holder 30 that holds and holds the cap 19 of the igniter 10 and the case where there is no holder 30, the rupture line of the cap 19 (tear line) 19 The condition in which the fragments of the broken part of the 19a are scattered Changes. Without the holder 30 that exerts the function of holding down the cap 19, the tear line (tea 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.

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 in the gas to be opened and the material of the parts. Combustion of the igniting charge (tricinate) 18 and the driving charge (single-base propellant) 50 produces different impacts on the tear lines 19a and 26a. Also, aluminum and resin have different tensile strengths, even if they have the same elongation. Considering these two factors, the burden on the tear lines 19a and 26a is clearly greater for the cap 19.

Therefore, the prevention of the rupture line (tea line) 19a of the cap 19 from scattering will be described.

The resin used in the igniter 10 is selected in consideration of heat resistance, strength, and weather resistance. In this embodiment, polyfuramide is used as a pace polymer. However, a cap 19 with a rupture line (tear line) 19a needs the optimal material strength and elongation. did.

It is shown in Table 3.

Table 3

Optimizing the dimensions and material of the rupture line (tear line) 19a of the cap 19 of the igniter 10 is an effective measure to prevent the rupture line (tear line) 19a from scattering. However, when a stronger impact, such as an increase in the amount of igniting charge or a change in igniting charge, is applied to the tear line 19a, it may be scattered.

Therefore, in order to buffer the rupture line (tear line) 19a, a holder 31 was added with a holding part 31a to take measures to prevent scattering.

Next, the holder 30 will be further described.

The relationship between the tear line (the tear line) 19 a of the cap 19 and the holder 30 holding the cap 19 is as follows: the diameter of the opening 31 formed in the end face of the holder 30, and the diameter of the opening 3 1 It depends on the shape of the holding portion 31a.

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 (tea 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 will break, and if the hardness is high or there is no elongation, the holding part 31a will Causes scattering. Therefore, the holder 30 functions only when the mechanical properties of the material are balanced.

If the holding part 31a is too strong (small hole diameter) or too weak (large hole diameter), the rupture line (tear line) 19 is broken by impact. Also, when the shape of the holding portion 31a is sharp (small chamfer), the rupture line (tea line) 19a is sheared.

In other words, the shape of the holding portion 31a effectively suppresses the scattering of the tear line 19a.

The shape of the pressing portion 31a includes, for example, those shown in FIGS. 24, 25, 26, and 27.

In the example shown in Fig. 24, hole diameter: ø4 to 5 mm, corner shape: C or R 0.3 to 0.5, plate thickness: 0.5 mn! 1 mm, Material: A5052, A6601. The example shown in Fig. 25 shows a case where the chamfer inside the hole is larger than that in Fig. 24.

The example shown in FIG. 26 shows an example in which the hole is formed into a tapered hole whose diameter is reduced toward the tip as compared to FIG.

The example shown in FIG. 27 shows an example in which the hole is formed into an R chamfered hole whose diameter is reduced toward the tip as compared to FIG. Next, a comparative test was performed for the rupture line (tea line) 19a with a length of 6 mm and 4 mm, and it was confirmed that there was a significant difference. At a length of 6 mm, a rupture line (tea line) 19 a is generated.

A comparative test was conducted with the resin for the igneous body, and it was confirmed that there was a significant difference. In the case of the main resin (A-1145HS), burst lines (tea lines) 19a are scattered.

FIG. 28 shows a gas generator 1A according to another embodiment of the present invention (corresponding to claim 17).

Gas generator 1 A according to the present embodiment, however _c are crimped to the body 4 0 through Igunai evening 1 0 A 0-ring as in the conventional gas generator 1 0 0 1 1 In the case of ignay 10A, a rupture line (tea line) 19a is provided on the cap 19, as in the case of the ignay 10.

On the head side of the igniter 10A, an insertion type holder 30A shown in FIG. 29 is provided.

As shown in Fig. 28, the insertion-type holder 3OA comes in contact with the step of the chamfered portion 25 where the outer peripheral wall is in contact with the inner peripheral wall of the cup and the tip is narrower than the body of the wrench. It is held and fixed by caulking and fixing the lip flange and the body edge.

Also in this case, the holder 3OA prevents the tear line 19a of the cap 19 from scattering.

Of course, it is desirable that the holding portion 31 A of the holder 3OA have the same hole diameter and hole shape as the holding portion 31a of the holder 30.

Further, the cup 2OA is provided with a rupture line (tea line) 2la 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 of the conventional gas generator 100 shown in FIG. 11 in which an o-ring is removed.

Also in the present embodiment, the use of the bulging portion of the signature 10B is used. Therefore, it is possible to securely hold.

There is no problem in the pressure resistance.

In addition, the rupture lines (tea lines) 19a and 2la are provided in the igniter 10B and the cup 20 as in the gas generator 1 shown in Fig. 1.

These functions and effects are the same as those of the gas generator 1.

[Experimental example] (Ensuring high structural strength)

1. Conventional problems

Fig. 11 Conventional gas generator 100 (standard igniter fixed with ◦ ring) as shown in Figure 11

1) It is difficult to increase the withstand pressure cross-sectional area due to limited body dimensions.

2) The only way to increase the strength within a limited range is to change the material to a high-strength material.

3) The structural strength of the double lock type (with a large shorting crimp) is lower than at present.

Here, the hole diameter X is ø10 mm for the single lock type and 11.1 mm for the double single lock type. 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 the structural strength is required to increase 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 pressure cross section

By eliminating the O-ring, the withstand voltage cross-sectional area was increased.

Conventional gas generator 1 0 0 At withstand sectional area (anticipated fracture sections when subjected to Igunai evening load due to internal pressure) is 4 4.0 a mm ² is whereas, gas generator according to this embodiment 1 was 80.5 mm ² , which was about twice as large.

In addition, a sealant is filled instead of the O-ring, but this sealant-filled type has good sealing performance and does not impair the function of the ignition.

2) Angle of pressure section The shape of the caulking groove in the body was devised so that the pressure-resistant cross section was angled with respect to the direction of the pressure load.

The groove in the body is where the cup is inserted and buried. In the present embodiment, instead of directly applying the cup to the groove portion, the cup is swaged so as to sandwich a holder (a component for fixing the igniter together with the body).

Since the flange shape of this holder can be made relatively freely, the corner of the groove can be made a large C or R shape. With this groove shape, an angle can be provided in the breakdown voltage section. That is, in the conventional gas generator 100 shown in FIG. 11, the pressure-resistant surface angle is 0 ° so as to be displayed 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 making an angle, 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 caused by internal pressure. Therefore, it becomes stronger than the simple shear stress, and the compressive strength increases.

1) Increase in withstand pressure cross section

As a result of performing a destruction test of the conventional gas generator 100 and the gas generator 1 according to the present embodiment, it was possible to obtain a destruction pressure commensurate with the increase in the withstand pressure cross-sectional area.

The results are shown in Table 4.

Table 4

The 1.7-fold increase in the burst pressure is lower than the 1.8-fold increase in the pressure-resistant area, because about 300 MPa is close to the break strength of the igniter itself. Seems to be at the limit.

2) Angle of pressure section

As a result of performing a destructive test by changing the angle of the pressure-resistant section with respect to the pressure receiving direction, It was found that the larger the surface angle, the higher the burst pressure

The results are shown in Table 5 and Figure 31.

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, near the angle of 0 °, the calculated and measured values match.

On the other hand, the compressive strength of the igniter is around 300 MPa, so when the burst pressure exceeds about 16 °, which reaches 300 MPa, the burst pressure reaches a plateau.

In addition, even with a double lock type (Shorting crimper diameter: ø11. Lmm → cross-sectional angle: 3.1 °), it is possible to realize 20 OMPa.

From the above results, the following advantages are achieved.

(1) When a standard-sized ignai evening is used, the structural strength is about twice that of the conventional ignai evening.

(2) Since the strength is enhanced by the shape (pressure-resistant cross-sectional area and angle), the degree of freedom in selecting the body material is high.

(3) Even with the double lock type, the structural strength of the conventional igniter (single lock type) is exceeded.

Next, the withstand voltage cross-sectional area will be described in detail.

1-1 Purpose of test

Check how the breaking pressure changes when the withstand pressure cross section is changed. 1-2 Test method

(1) Confirmation of structural strength gap by increasing cross-sectional area

With the structure of the conventional gas generator 100 and the gas generator 1 according to the present embodiment, a destructive test was performed on the body 30 of the gas generator 1 according to the present embodiment using the same material to increase the cross-sectional area. Confirm that structural strength is increased by (2) Confirmation of ability when material is changed

Since the gas generator 1 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

This was performed using the equipment shown in FIG.

1. Attach a spacer 91 to make the inside of the tank 90 an arbitrary volume. (All tanks in this test have a volume of 2 cc.)

2. Attach the gas generator G and a pressure sensor (not shown), and connect the gas generator G to the ignition bus and the pressure sensor to the measuring instrument. The pressure sensor is attached to the pressure mounting hole 92.

3. Apply an ignition current to the gas generator G to ignite and measure the pressure in the tank 90 at that time.

4. When the pressure rises, the gas generator G (body 30 and igniter 10) is destroyed, 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 crush pressure (structural strength). This pressure waveform is shown in FIG.

Supplement: Set the internal volume of the test tank to 2 cc, place the gas generator in the tank body, turn on the power, and raise the gas combustion pressure (internal pressure) of the driving agent of the gas generator to increase the gas volume. The generator body is unable to hold the ignition, the ignition and the body are broken, and discharged to the outside of the tank on the ignition bus side (connector side).

In FIG. 32, a knockout pin 93 operated by a butterfly nut 95 is attached to the tank 90 via a collar 94. Further, a cap 96 for fixing the gas generator G to the tank 90 is screwed to the tank 90.

1-4 Test results

As shown in Table 4.

In Table 4, ZDC2 is the material code of JIS (two types of zinc alloys). A5056 is the JIS material code (aluminum alloy).

By removing the O-ring, the conventional gas generator 100 can withstand pressure Expected fracture cross section under igniter load due to pressure) is 44.0 mm ² , whereas that of gas generator 1 according to the present embodiment is 80.5 mm ² , which is about twice as large. The area was secured.

As a result, the gas generator 1 according to the present embodiment was able to obtain a burst pressure commensurate with the increase in the pressure-resistant cross-sectional area.

The increase in burst pressure, 1.7 times the increase in pressure-resistant area, 1.7 times lower, is about 300 MPa close to the breaking strength of the igniter itself. It seems to be.

Next, the withstand pressure sectional area angle will be described in detail.

2-1 Test purpose

Check how the burst pressure changes when the withstand pressure cross-sectional area angle is changed.

2-2 Test method

In order to make elements other than the pressure-resistant cross-sectional area angle as constant as possible, the pressure-resistant cross-sectional angle was changed by changing the shorting clamp diameter (specifically, by changing X in Figs. 10 and 11). To change the cross-sectional angle with respect to the axis).

With this method, changes in the pressure-resistant area (shear area) can be minimized, and the effect of the pressure-resistant area angle can be investigated purely.

2-3 Test method

Perform a destructive test in the same way as the withstand pressure cross section, and measure the pressure at the time of destruction.

2-4 Test results

As a result of performing a fracture test by changing the angle of the pressure-resistant cross section with respect to the pressure receiving direction, it was found that the larger the angle of the pressure-resistant cross section, the greater the fracture pressure.

Table 5 shows the results.

In Table 5, A5056 was used for the body material.

Since the compressive strength of the igniter is around 30 OMPa, when the burst pressure exceeds about 16 °, which reaches 30 OMPa, the burst pressure reaches a plateau.

According to the test results, the larger the angle, the higher the burst pressure, so there is a concern that the burst pressure decreases when the angle is small. However, even at around 0 °, about 18 OMP a It has a burst pressure of the order of magnitude, so there is no practical problem.

Therefore, even with a double lock type (shortening crimp diameter: ø11.1 mm, cross section angle (9: 3.1 °)), a burst pressure of 20 OMPa or more can be secured (double lock type As regards the fact that the steel has sufficient structural strength, the benefits of the increase in the pressure-resistant area described in the preceding paragraph are stronger than the provision of the angle of the pressure-resistant area.)

The present invention has the following effects.

(1) The holder can hold the header side of the bulging portion of the signboard and can eliminate the blind space.

(2) By adjusting the axial length of the holder, it is possible to secure a predetermined filling rate of the driving agent in the cup and to stabilize the pressure characteristics.

(3) Since the connector side of the bulging part of the igniter and the igniter receiving part of the body that receives this connector part have the same shape, when the gas generator operates, the igniter A pressure-resistant structure that can sufficiently withstand the operating pressure is obtained.

(4) A rupture line (tear line) is provided on the bottom of the cup closure, so that the broken fragments do not come off due to the combustion gas pressure.

(5) The rupture line (tear line) is provided on the bottom of the cap closure at the igneous evening, so the broken fragments do not come off due to the combustion gas pressure.

(6) The igniter is covered with a holder and a rupture line (tear line) is provided at the bottom of the cap closure.

(Tea line) can be prevented from being detached.

Claims

The scope of the claims

(1) 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 disposed in contact with the connector side of the bulging portion of the igniter, an opening on the bottom surface through which the flame from the igniter passes, and an outer periphery of the header portion and the bulging portion of the igniter A cylindrical holder with a bottom placed so as to cover the

A bottomed cylindrical cup having an inner peripheral side surface overlapping the outer peripheral side surface of the holder and having a closed portion on the bottom surface;

And a driving agent accommodated in the force switch,

By fixing the opening end of the holder and the opening end of the force lap on the body by overlapping and caulking,

The igniter is sandwiched between the holder and the body via the bulging portion, and an outer peripheral side surface of the holder and an inner peripheral side surface of the force tub are brought into close contact with no gap, and A driving medicine container is formed between the opening side and the closed part of the cup.

A gas generator characterized in that:

(2) In the gas generator according to claim 1,

The body includes an igniter receiving portion formed of a wall surface in contact with a wall surface of the bulging portion of the igniter on the connector side, a flange portion provided outside an opening end of the holder, and the force-receiving portion. A gas generator characterized by being integrally formed with an annular edge groove portion having an edge portion which can be fixed by caulking a flange portion provided outside an opening end portion of an opening.

(3) In the gas generator according to claim 2,

A gas generator, wherein a silicone sealant is applied to a flange of a flange provided outside an opening end of the holder.

(4) In the gas generator according to claim 2,

A silicone sealant is applied to the igniter receiver of the body. And a gas generator characterized by the above.

(5) In the gas generator according to claim 1,

The gas generator according to claim 1, wherein the driving agent container can change the filling ratio of the driving agent to 80% to 90% by replacing the holder.

(6) an igniter having a header portion and a connector portion;

A body attached to the connector side of this igneous evening,

A bottomed cylindrical cup having a closed portion on the bottom surface, providing a rupture line on the bottom surface, and being attached to the igniter;

The driving medicine contained in this cup and

A gas generator comprising:

(7) In the gas generator according to claim 6,

The gas generator, wherein the burst line forms a remaining plate thickness of 30% to 50% with respect to the plate thickness of the bottom surface.

(8) a signature having a header portion and a connector portion and having a rupture line in the header portion;

A body attached to the connector side of this igneous evening,

A bottomed cylindrical forcep having a closed portion on the bottom surface and attached to the igniter; a driving agent accommodated in the forcep;

A gas generator comprising:

(9) In the gas generator according to claim 8,

The gas generator, 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 the header portion and the connector portion are connected via a bulging portion;

A body disposed in contact with the connector portion side of the bulging portion of the igniter, a closed-end portion having a closed bottom surface, and a bottomed cylindrical force tub attached to the igniter; The driving drug contained in

A gas generator comprising:

(11) Having a header part and a connector part and providing a rupture line in the header part Ignai evening

A body attached to the connector side of this igneous evening,

A bottomed cylindrical force bar having a closed portion on the bottom surface, providing a rupture line on the bottom surface, and being attached to the igniter;

The driving medicine contained in this cup

A gas generator comprising:

(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 side of this igneous evening,

A bottomed tubular cup having a closed portion on the bottom surface and providing a rupture line on the bottom surface, and being attached to the igniter;

The driving medicine contained in this force

A gas generator comprising:

(13) A signal having a header portion and a connector portion and having a rupture line in the header portion,

A body attached to the connector side of this igneous evening,

A bottomed cylindrical holder having an opening at the bottom surface through which the flame from the igniter passes and covering the outer periphery of the header and the bulging portion of the igniter;

A bottomed cylindrical cup having a closed portion on the bottom surface and attached to the igniter, and a driving medicine contained in the cup

A gas generator comprising:

(14) In the gas generator according to claim 13,

The opening of the holder is formed by a hole that decreases in diameter toward the force nip.

A gas generator characterized in that:

(15) In the gas generator according to claim 13,

The rupture line is disposed 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. A gas generator characterized in that:

(16) In the gas generator according to claim 13,

The gas generator, wherein the holder is fixed to the body by overlapping with the nip.

(17) a signature having a header portion and a connector portion and having a rupture line in the header portion;

A body attached to the connector side of this igneous evening,

A bottomed cylindrical holder having an opening on the bottom surface through which the flame from the igniter passes and covering an outer periphery of a header portion of the igniter; a closing portion on the bottom surface; A cylindrical tub with a bottom attached in the evening,

A gas generator comprising: