WO2001051193A1

WO2001051193A1 - Gas generator

Info

Publication number: WO2001051193A1
Application number: PCT/JP2001/000180
Authority: WO
Inventors: Junya Amano; Akihiko Tanaka; Dairi Kubo; Hiroshi Hori
Original assignee: Nippon Kayaku Kabushiki-Kaisha
Priority date: 2000-01-14
Filing date: 2001-01-15
Publication date: 2001-07-19
Also published as: AU2001225525A1; TW483842B

Abstract

A gas generator, comprising a first cup filled with gas producing agent generating gas by combustion, an ignitor having a second cup disposed inside the first cup and storing ignition powder ignited by the application of electric power, and a holder fixing the ignitor to the center of the first cup so as to seal the gas producing agent and ignitor in the first cup, wherein a space in the first cup is formed in a closed space of 1.9 x 10?-3 Pa.m3¿/sec or less in leak amount.

Description

Specification

Gas generator technical field

The present invention relates to a gas generator, and more particularly to a gas generator suitable for operating a seat belt pretensioner of an automobile. Background art

A belt pretensioner is known as one of safety devices for protecting an occupant from an impact caused by a collision of an automobile. This planter operates with a large amount of high-temperature, high-pressure gas generated by a gas generator.

FIG. 13 shows an example of a conventional gas generator for operating this pretensioner. The gas generator 108 shown in Fig. 3 is composed of a gas generating agent 106 that generates a large amount of gas when ignited, an ignition device 104 that stores an igniting agent that is ignited by energization, and a gas generating agent. No. 1 cutoff for storing. A holder 1 for fixing the gas generating agent 106 and the igniter 104 to the inside of the first cuff '10 by fixing the igniter 100 and the igniter 104 to the center, respectively, with the igniter 104 and the first cuff 102 fixed at the center. 0 1, a ring 0 105 arranged in a gap between the igniter 104 and the holder 101 to prevent moisture from entering through a gap between the igniter 104 and the holder 101. It consists of a shorting clip 107 for short-circuiting two pins Α standing upright from the igniter 104.

In addition, as shown in FIG. 12, the igniter 104 generally has a second power cup E for storing an igniting agent D and an igniting agent inserted and fitted in the second cup E! ), And a pin A made of two metal rods penetrating through the emboli B. W

The second forceps E and the embolus B are formed of a plastic resin or the like. Each pin A protrudes into the second cup E, and its tip is electrically connected by a bridge bridge F. Denbashi Line F is covered with an ignition ball C in contact with an explosive D.

By the way, in an environment where automobiles are used, it is necessary to guarantee the performance of the gas generator for a long period of time, for example, 15 years. However, in the conventional gas generator, the penetration of water, 7j steam, etc., may cause deterioration of the gas generating agent and igniting agent, and may cause disconnection due to corrosion of the bridge. Therefore, it is difficult to guarantee its performance.

An object of the present invention is to provide a gas generator having high reliability with respect to environmental resistance performance. Disclosure of the invention

The present inventors have made intensive studies in order to solve the above problems, the leakage amount is 1. 9x10- ³ from the space of the first force Tsu the flop for accommodating the gas generating agent [P a - mVsec] It has been found that a gas generator which is a closed space described below solves the above problems, and has led to the present invention.

That is, the gas generator according to the present invention includes a first force member filled with a gas generating agent that generates gas by combustion, and an ignition agent disposed inside the first force member and ignited by energization. An ignition device having a second cup for accommodating the ignition device, and a holder for fixing the ignition device to the center of the first force sop and sealing the gas generating agent and the ignition device in the first cup. space in 1 cup leakage amount from the space of that is 1, 9 × 10 one ³ - characterized in that it is a [Pa mVsec] following the enclosed space.

League weight 1. 9x10- ³ [Pa - mVsec] in the enclosed space is below the first cutlet The water and water vapor in the space inside the lamp is sufficiently prevented, and the gas generating agent filled in this space and the igniting agent and the ignition ball stored in the second power ring of the igniter are exposed to moisture. It does not degrade its performance.

There are various means for making the space in the first force gap a closed space with a leak amount from the space of 1.9 × 10 ⁻³ [PararaVsec] or less. Specifically, in the gas generator of the present invention, a seal member made of an adhesive, an o-ring, or a sheet packing is used for a joint between the holder and the first cup. Thereby, the leak amount L'9xl0- ³ - can be a [Pa mVsec] or less.

The adhesive is not particularly limited as long as it does not crack even at a temperature change of 140 ° C to 85 ° C. Adhesives are preferred. Further, an O-ring as a sealing member and a sheet packing are not particularly limited, but those which are hardly permeable to moisture such as nitrile, silicon, ethylene propylene rubber and the like are preferable. These sealing members are a holder and a cuff. It is preferable that it is provided over the entire joint of the body.

Further, in the gas generator of the present invention, a silicon sealant containing silicon as a main component may be disposed at the joint between the holder and the first forcep ′. The method of using the silicon material is to apply an appropriate amount of a liquid silicone sealant in advance to the joint between the holder and the first nip, and to dry it. After drying, attach the first cup to the holder by swaging. At this time, it is preferable that the silicone sealant is applied over the entire periphery of the joint between the holder and the first cup.

Furthermore, in the gas generator of the present invention, the joint between the holder and the first cup may be welded. This makes it possible to reduce the leak amount to L 9xlO_ ³ [Pa-mVsec] or less. The welding method is not particularly limited. It is preferable to use a YAG (Yt triurn A 1 umini garnet) laser welding, which has a relatively small heating value.

In addition, a separator may be provided for confining the gas generating agent in the first forceps and blocking the gas generating agent from the second forceps. The Separet overnight prevented the ingress of moisture, such as moisture, from the outside of the gas generator into the first power cup through an embolus of the second cup, etc., and reduced the amount of leakage to 1.9xlO- ³ [Pa-mVsec ] It contributes to:

Further, the holder and the plug of the second forceps may be integrally formed. In this case, the gap existing between the holder and the plug of the second cup, in other words, the passage of moisture or air can be eliminated. The gas generator reduces the number of paths communicating from the outside into the first gusset, and can more effectively prevent moisture and air such as moisture from entering the first gusset, reducing the amount of leakage by 1.9. x10- ³ [Pa - mVsec] contributes to less.

In addition, in the gas generator of the present invention, it is preferable to use an O-ring or a sheet packing as a seal member at a joint between the holder and the igniter. The material of the O-ring as the seal member and the sheet packing are not particularly limited, but materials such as nitrile, silicon, and ethylene propylene rubber which are hardly permeable to moisture are preferable. These seal members are preferably provided over the entire periphery of the joint between the holder and the igniter. The gas generator of the present invention described above is suitable as a gas generator for a sheet belt pretensioner. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic cross-sectional view of a first embodiment of a gas generator according to the present invention, and FIG. 2 is a cross-sectional view of the first embodiment of the gas generator according to the present invention. FIG. 3 is a schematic sectional view, FIG. 3 is a schematic sectional view of a third embodiment of the gas generator according to the present invention, and FIG. 4 is a fourth embodiment of the gas generator according to the present invention. FIG. 5 is a schematic sectional view of an example, FIG. 5 is a schematic sectional view of a fifth embodiment of the gas generator according to the present invention, and FIG. 6 is a sixth sectional view of the gas generator according to the present invention. FIG. 7 is a schematic sectional view of a gas generator according to a seventh embodiment of the present invention; FIG. 7 is a schematic sectional view of a gas generator according to a seventh embodiment of the present invention; FIG. 9 is a schematic sectional view of an eighth embodiment, FIG. 9 is a schematic sectional view of a ninth embodiment of the gas generator according to the present invention, and FIG. 10 is a gas generator according to the present invention. FIG. 11 is a schematic cross-sectional view of a tenth embodiment of the present invention. FIG. 11 is a schematic cross-sectional view of a first embodiment of the gas generator according to the present invention. Yes, FIG. 12 is a schematic sectional view of a gas generator igniter, FIG. 13 is a schematic sectional view of an example of a conventional general gas generator, and FIG. It is a table | surface which shows the result of a test. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the gas generator of the present invention will be described with reference to the drawings.

(First Embodiment)

First, a first embodiment of the present invention will be described. The gas generator 50 shown in FIG. 1 operates a seat belt pretensioner of an automobile. The gas generator 50 burns the gas generating agent 14 by igniting the igniter 12 to quickly generate an appropriate amount of gas. As a result, a seat belt not shown. The retainer operates.

In FIG. 1, the gas generator 50 has a first cuff 10, a gas generating agent 14, an igniter 12, and a holder 9.

The gas generating agent 14 may be passed through a filter and / or a coolant. At the same time, it is filled in a state of directly contacting the inner periphery of the first cuff 0.

The first cup 10 has a large-diameter cylindrical portion 10a and a small-diameter cylinder 咅 10b, and is a substantially bottomed cylindrical dog that expands in one step from the bottom side. A step portion 29 is formed on the inner peripheral side of the boundary between the large and small cylindrical portions. A plurality of linear notches 10 c are provided at the bottom of the first cup 10. When the gas generating agent 14 stored in the first cuff 10 is burned, the notch 10c is broken and the gas is directly discharged to a seat belt pretensioner (not shown). A flange portion 10d extending outward in the radial direction is formed at the open end of the first cuff 0, and is attached to the holder 9 by caulking. The first cutlet. Examples of the material 10 include metal materials such as stainless steel and aluminum.

As shown in FIG. 12, the igniter 12 is provided with an igniting agent, a second cuff filled with the igniting agent D, and an erecting member for conducting electricity for igniting the igniting agent D. Includes two pins A and emboli B.

The igniter 12 is provided with a shorting clip 11 for short-circuiting two pins A as shown in FIG. The shorting clip 11 is for preventing malfunction due to static electricity or the like.

In FIG. 1, the holder 9 is formed of a metal material such as stainless steel or aluminum or a resin. The holder 9 has a first hole 9c for inserting and embedding the plug B portion of the igniter 12; a projection 9b for caulking the plug B of the igniter 12; And a projection 9 a for caulking the tip 10. The holder 9 uses the ignition device 12 as a first cuff. The position of the first cup 10 is fixed so as to be located at the center of 10 and the plug B of the igniter 12 is held. A ring 13 as a seal member is provided between the contact surfaces of the igniter 12 and the holder 9, that is, in the gap. A seal member 51 made of an epoxy adhesive is provided between the contact surface between the holder 9 and the caulking projection 9a, which is a caulking portion of the first cup 10, and the first cup 1.0, that is, a gap. I have. The 0 ring 13 and the sealing member 51 respectively seal the gap between the holder 9 and the igniter 12 and the gap between the holder 9 and the first cup 10, and the water in the second cup 10. And water vapor are prevented from entering.

The gas generator 50 has a first cuff with the structure as described above. The amount of leakage from the spatial S 1 in 0 1. 9xl (T ^3. - are less [Pa m'Vsec] This is an excellent gas generator environmental resistance.

Next, a method for manufacturing the gas generator 50 of the present invention will be described.

First, the igniter 12 is fixed to the holder 9 by caulking via the ring 13. Next, the first cuff 0 is filled with a gas generating agent 14. The holder 9 to which the igniter 12 is fixed is inserted into the first force holder 10 filled with the gas generating agent 14 and fixed by caulking. Finally, the holder 9 and the first knife. An epoxy adhesive is applied and dried between the contact surface between the caulking projection 9 a, which is the caulking portion with 10, and the first cup 10 to form the seal member 51.

Next, the operation of the gas generator 50 of the present invention will be described.

When a collision sensor (not shown) detects a vehicle collision, the pin A provided on the igniter 12 shown in FIG. 12 is energized. Then, the bridge wire F in the igniter 12 generates heat, and the ignition ball C ignites. Subsequently, the ignition of the ignition ball C causes the ignition charge D to ignite and burn. The inside of the igniter 12 becomes high temperature and high pressure with the burning of the igniting agent D, and the second cup E of the igniting agent 12 expands and breaks before the igniting agent D is sufficiently burned and burned.

The high-temperature and high-pressure gas and particles are released toward the space S in the first cup 10. At this time, the gas generating agent 14 in the first And high pressure gas and particles are sprayed. Then, the gas generating agent 14 is ignited.

Subsequently, a large amount of gas generated in the first cuff ° 10 by the combustion of the gas generating agent 14 rapidly increases the internal pressure of the first cuff ° 10, and is eventually provided at the bottom of the I-th cuff ° 0. The notch 1 O c is broken and introduced into a seat belt pretensioner (not shown), and the seat belt pretensioner operates.

(Second embodiment example)

Next, a second embodiment of the present invention will be described. The gas generator 53 shown in FIG. 2 is for operating a seat belt pretensioner of an automobile, similarly to the gas generator 50 described above. In FIG. 2, components having the same functions as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

In FIG. 2, the difference from FIG. 1 is that, instead of the epoxy resin sealing member 51, the contact surface between the holder 9 and the flange portion 10 d of the first cup 10, that is, the gap The other point is that a sealing member 52 made of sheet packing is provided with elastic force.

The O-ring 13 and the sealing member 52 seal the gap between the holder 9 and the igniter 12 and the gap between the holder 9 and the first cup body 10, respectively. Water and water vapor are prevented from entering the inside of zero. '

The gas generator 5 3, the structure described above, a leakage amount of leakage from the space S of the first Katsufu Ί within 0, 1. 9x10- ³ - is a [Pa mVsec] or less. This is a gas generator having excellent environmental resistance performance.

(Third embodiment example)

Next, a third embodiment of the present invention will be described.

The gas generator 55 shown in FIG. 3 is the same as the gas generator 50 described above. Similarly, it is for operating the seat belt pretensioner of the automobile. In FIG. 3, components having the same functions as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

In FIG. 3, the difference from FIG. 1 is that, instead of the epoxy resin sealing member 51, the tangential plane between the holder 9 and the flange portion 10d of the first cuff ° 10, that is, The point is that a silicone sealant 54 containing silicon as a main component is provided in the gap with elasticity. ,

The Q ring 13 and the silicone sealant 54 are provided in the gap between the holder 9 and the igniter 12, respectively, and in the holder 9 and the first cuff. Seal the gap between body 10 and 1st cutlet. Prevents water and water vapor from entering the 10.

The gas generator 5 5 by the structure as described above, a leakage amount of leakage from the space S of the first cup 1 in 0, 1. 9 × 10 one ³ - is a [Pa m'Vsec] or less. This is a gas generator having excellent environmental resistance performance.

(Fourth embodiment example)

Next, a fourth embodiment of the present invention will be described.

The gas generator 57 shown in FIG. 4 is for operating a seatbelt pretensioner of an automobile, similarly to the gas generator 50 described above. In FIG. 4, components having the same functions as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

In FIG. 4, the difference from FIG. 1 is that instead of the epoxy resin sealing member 51, the holder 9 and the caulking portion of the caulking portion of the first cup 10 and the caulking projection 9a and the first cuff are used. This is the point where a welded portion 56 YAG laser-welded is formed between the contact surfaces with 0, that is, in the gap.

The ring 13 and the welded portion 56 seal the gap between the holder 9 and the igniter 12 and the gap between the holder 9 and the first cup body I 0, respectively. Prevents water vapor from entering. The gas generator 57 has a first cuff with the above structure. The leakage amount of leakage from the space S 1 in the 0, 1. 9 × 10 one ³ - is a [Pa mVsec] or less. This is a gas generator with excellent environmental resistance.

(Fifth embodiment example)

Next, a fifth embodiment of the present invention will be described.

A gas generator 18 shown in FIG. 5 is for operating a seatbelt pretensioner of an automobile, similarly to the gas generator 50 described above. In FIG. 5, components having the same functions as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 5 differs from FIG. 1 in that a separate cup 15 is provided in a first cup 10 instead of the epoxy resin seal member 51.

As mentioned above, I5 covers the second cup of the igniter 12 and its outer peripheral surface is in contact with the inner peripheral surface of the first cup 10. The first cutlet. The position of the separator 15 in 10 is determined by a step 29 provided inside the cylindrical portion of the first cuff 0. The material of the separator 15 is a metal material such as iron, aluminum, or stainless steel, a resin such as PBT, or a fluororesin. The shape of the separator 15 is a substantially single cylindrical body. The separator 15 has a score 17 and a second hole 15a. The separator functions as an plug for the first cup filled with the gas generating agent, and shuts off the igniter in the first power switch and the gas generating agent.

The score 17 is provided on the gas generating agent 14 side to concentrate the energy of the igniter 12 in the direction of the gas generating agent 14. It is preferable that the score 17 is provided in a symbol that does not penetrate the separator 15, but it may be closed once with aluminum foil or the like after it is once penetrated. The second mosquito 15a is a hole into which the second cup E of the igniter 12 is inserted and fitted. It is preferable that the inner surface shape is in accordance with the outer surface shape of the second cup E of the igniter 12 so that the second cup E of the igniter 12 and the separator 15 are substantially in close contact with each other. The gap between the second cup E and the separator 15 is preferably 1 mm or less, more preferably 0.2 mm or less. If the gap is within this range, no problem occurs.

In addition, it is preferable that the contact surface between the separator 15 and the first cuff ° 10 be in close contact with each other. Can be one of Conventionally, there have been two types of paths: a gap between the first cuff 102 and the holder 101 and a gap between the igniter 101 and the holder 101 (see FIG. 13).

Further, by providing a sealing member such as a 0 ring 16 on the surface of the separator 15 which is in contact with the first cup 10, the moisture proof property can be further ensured.

The O-ring 16 serving as the seal member is provided in a groove 15 b which is a portion in contact with the inner peripheral surface of the first cuff 0 and is provided annularly along the outer peripheral surface of the separator 15. . The front ring 16 is provided as a part of the separator 15 and has elasticity between the separator 15 and the first cuff 0.

With such a structure, the moisture entering the gas generating agent 14 is limited to one type of path of the gap existing on the contact surface between the separator 15 and the first cuff 10. In addition, an O-ring 16 that seals between the separation 15 and the I-cuff 0 is installed on the route.

The gas generator 1 8, the structure described above, a leakage amount of leakage from the space S of the first cup I in 0, 1. 9 × 10 one ³ - is a [Fa mVsec] or less. This is a gas generator with excellent environmental resistance. (Sixth embodiment example)

Next, a sixth embodiment of the present invention will be described.

The gas generator 23 shown in FIG. 6 is for operating a seatbelt pretensioner of an automobile, similarly to the gas generator 50 described above. In FIG. 6, components having the same functions as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

In FIG. 6, what differs from FIG. 1 is a first cuff instead of the epoxy resin seal member 51. This is the point that a separate pare was set up in 19 in 21.

The gas generator 23 shown in FIG. 6 has a first cup 21 in which a convex portion 30 protruding inward is provided on the inner peripheral surface.

The first cup 21 has a large-diameter cylindrical portion 21a and a small-diameter cylindrical portion 21b, and has a substantially bottomed cylindrical shape whose diameter is increased in one step from the bottom side. A step portion 29 is formed on the inner peripheral side of the boundary between the large and small cylindrical portions. A plurality of linear notches 1c are provided at the bottom of the first cup 21. When the gas generating agent 14 stored in the first cup 10 is burned, the notch 21 c is broken, and the gas is directly discharged to the seat belt pretensioner (not shown). A flange portion 21 d extending radially outward is formed at the open end of the first cuff '21, and is attached to the holder 9 by caulking. Examples of the material of the first cup 21 include metal materials such as stainless steel and aluminum.

The protruding part 30 protruding inward from the first cuff ° 21 is the opening of the first cup 21 compared to the step sound of the gas generator 18 shown in FIG. It is off to the end. And, when viewed from the circumferential surface of the first force curve 21, it is a concave portion. The convex portion 30 is located at the position of the separator 19 when the position at which the stepped portion 29 is provided is limited in terms of attachment to the seat belt pretensioner 1. It is newly provided for decision.

While keeping the volume in the first cup 21 wider than that shown in FIG. 5, the separation 19 can be positioned.

The convex portion 30 is provided on the inner peripheral surface of the I-th cuff 21, at a position corresponding to the vicinity of the center of the second cup E of the igniter 12 in the height direction. For this reason, the separator 19 positioned by the convex portion 30 is formed so that the shaft portion 19 a rises toward the gas generating agent 14 to cover the second cup E of the igniter 12. Have been. A part of the outer peripheral surface of the separator 19, specifically, the opening side is determined to have a diameter in contact with the inner peripheral surface of the large-diameter cylindrical portion 21a of the first cup. The separator functions as an obstruction for a first forceps filled with a gas generating agent, and shuts off the igniter and the gas generating agent in the first forceps.

In the gas generator 23, the first force is soft. The protrusions 30 provided on the first cup 21 are shown in advance as being provided on the first cup 21 before the fitting of the separator 19, but the separator 30 is provided on the first cup 21. After the evening 19 'is fitted, the first cup 21 is crimped from the outside to form a recess on the outer surface to form a protrusion 30 on the inner surface, and the separator 19 is fixed. May be. In addition, the 1 ring 16 of the separator 1 9 is provided.

The corresponding portion of the first cup 21 may be caulked from the outside so as to form the projection 30 toward 19 b.

Foreword The self gas generator 23 is the first cuff with the above structure. The amount of leak from the space S in 2 1 is set to 1.9xlO- ³ [Pa-mVsec] or less. This is a gas generator with excellent environmental resistance.

(Seventh embodiment)

Next, a seventh embodiment of the present invention will be described.

The gas generator 28 shown in FIG. 7 is the same as the gas generator 50 described above. Similarly, it is for operating the seat belt pretensioner of the automobile. In FIG. 7, components having the same functions as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

7 is different from FIG. 1 in that a cup-shaped separator 24 is provided in the first cup 10 instead of the epoxy resin sealing member 51.

Said cutlet. The shape-shaped separator 24 is the first cuff. It is attached to holder 26 together with 10 by caulking.

Holder 26 is the first cuff. A crimping projection 26 a for attaching both 10 and separator 24 to holder 26 is provided.

Separator - motor - ₂ 4 is disposed in Holder 2 6 is formed into a cup shape so as to cover the igniter 1. Part of the outer peripheral surface of the separator 24, specifically, the opening side is a diameter that is in contact with the inner peripheral surface of the large-diameter cylindrical portion 10a of the first forcep, or slightly smaller than that. It is determined by the diameter. The separator functions as a plug for the first cuff filled with the gas generating agent, and shuts off the igniter and the gas generating agent in the first cup.

In addition, a flange portion 24a is formed at an opening of the separator 24 at the end. The flange portion 24a extends radially outward so as to be attached to the holder 26 together with the first cup 10.

The flange portion 24 a is attached to the holder 26 together with the flange portion 10 d of the first force 10 filled with the gas generating agent 1. Foreword 5 The caulking portion is caulked by pressing and bending the caulking projection 26 a of the holder 26 on the flange portion 1 O d of the first cup 10. The first cut. Between the flange portion 10d of 10 and the flange portion 24a of the separator 24, a seat packing 25 as a seal member is provided with elasticity. Separator 2 4 Gas generating agent 1 4 A score of 27 is provided.

The igniter I 2 is not directly attached to the holder 26 by caulking, but is fitted to the first mosquito 26 b of the holder 26 by the separator 24. ◦The ring 13 is provided between the holder 16 and the igniter 11 with elasticity.

The gas generator 28 has a first cuff with the above structure. The leakage amount of leakage from the space S 1 in the 0, 1. 9x10- ³ - is a [Pa mVsec] or less. This is a gas generator with excellent environmental resistance.

(Eighth embodiment)

Next, an eighth embodiment of the present invention will be described.

A gas generator 34 shown in FIG. 8 is for operating a seatbelt pretensioner of an automobile, similarly to the gas generator 50 described above. In FIG. 8, components having the same functions as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 8, what differs from FIG. 1 is a first cuff instead of the epoxy resin seal member 51. The point is that a cup-shaped separator 132 is provided in 10. The separator 32 is attached to the holder 31 by caulking.

The holder 31 has a caulking projection 31 a for attaching the first cuff 10, and a caulking projection 3 lb for attaching the separator 13 together with the embolus B.

The separator 32 is formed in a cup shape so as to cover the second force Sop E of the igniter 12 and the tip of the plug B of the igniter 12. The opening end is formed with a flange portion 32 a that extends obliquely outward in the radial direction with respect to the distal end portion of the embolus B so as to be attached by crimping to the holder 31. So that it can be folded over the flange portion 3 2a of the separator 32. The flange portion 32 a is attached to the holder 31 together with the plug B of the igniter 12 by the swaged projection 3 lb of the holder 31 crimped. A sealing agent (not shown) is applied between the contact surfaces of the holder 31 and the separator 13, that is, the gap.

Next, the holder 31 on which the igniter 12 and the separator 32 are mounted is inserted into the first cup 10 filled with the gas generating agent 14 and fitted therein. And the first cutlet. The first cuff is formed by crimping projections 31 a of the holder 31 caulked so as to be bent over the flange portion 10 d of 10. 10 is attached to the holder 31.

An O-ring 33 as a seal member is provided between the contact surface of the holder 31 and the first cuff 10 with elastic force.

The igniter 12 is not directly attached to the holder 31 by caulking, but is fitted to the first mosquito 31 c of the holder 31 by the separator 32. Instead of applying a sealing agent between the contact surfaces of the holder 31 and the separator 31, a sheet packing may be inserted.

Moisture that tries to enter the first cuff '10 along the igniter 12 is cut off by the holder 31 and the separator 32. The holder 3I is preferably made of a metal material such as stainless steel or aluminum which is strong and has low moisture permeability from the viewpoints of strength and moisture permeability. Similarly, it is preferable that the separator 32 be made of a metal material such as stainless steel or aluminum which is strong and has low moisture permeability from the viewpoint of heat resistance and moisture permeability.

Due to the structure described above, the gas generator 34 has an amount of leakage from the space S in the first cup 10 of 1.9 × 10 ⁻³ [Pa-mVsec] or less. This is a gas generator with excellent environmental resistance.

(Ninth embodiment example)

Next, a ninth embodiment of the present invention will be described. The gas generator 43 shown in FIG. 9 is for operating a seatbelt pretensioner of an automobile similarly to the gas generator 50 described above. In FIG. 9, components having the same functions as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

In FIG. 9, the difference from FIG. 1 is that a cuff is provided in a first cup 36 instead of the epoxy resin sealing member 51. This is the point that a separate separator 37 is provided.

In the gas generator 43 shown in FIG. 9, the plug 35 of the holder 35 and the igniter 38 is formed of resin and integrated.

The first cup 36 has a large-diameter cylindrical portion 36a, a medium-diameter cylindrical portion 36b, and a small-diameter 36c cylindrical portion, and has a bottomed cylindrical shape that expands in two stages from the bottom side. Is doing. Step portions 4la and 41b are formed on the inner peripheral side of the boundary between the large, medium and small cylindrical portions.

The separator 37 is formed on the cuff dog so as to cover the igniter 38 and is disposed on the holder 35. Part of the outer peripheral surface of the separator 37, more specifically, the opening side has a diameter that is in contact with the inner peripheral surface of the medium-diameter cylindrical portion 36b of the first forcep, or more. It has a slightly smaller diameter. The separator functions as a plug for the first cup filled with the gas generating agent, and shuts off the igniter and the gas generating agent in the first cup. At the open end of the separator 37, a flange portion 37a is formed which protrudes to the inner peripheral surface of the large-diameter cylindrical portion 36a of the first cup. When the flange portion 37a comes into contact with the opening-side step portion 41a of the first cuff '36, the position of the separator 37 in the first cup 36 is determined by the holder 35. Has a metal insert 42 provided on the body. The insert 42 is a cylindrical plate 4 2b and a ring-shaped plate 4 continuous from one end thereof. 2a, and constitutes a flange projecting from the holder 35. The first force 'sof' 36 Step section 4 1 a Separation 1 1 3 7 flange section

37 a is brought into contact, and the ring-shaped plate body 42 a of the metal insert 42 is brought into contact with the flange portion 37 a via a ring 39. In that state, the first cuff. By bending the open end of 36 onto the other end of the cylindrical body 42b of the metal insert 42, the flange portion 37a of the separator 37, the metal insert 42 and the first cap 36 are separated. And crimp them together.

At this time, the step portion 41 a of the first grip 36 and the flange portion 37 a of the separator 37 are pressed against the metal insert 42 side, and the O-ring 39 is deformed and mutually displaced. The space is sealed. In addition, a score of 40 is provided on the gas generating agent 14 side of Separe Night 37.

The gas generator 43 has a first cuff with the above structure. The leakage amount of leakage from the space S 3 in 6, 1. 9x10- ³ - is a [Pa mVsec] or less. This is a gas generator with excellent environmental resistance.

(Embodiment 10)

Next, a tenth embodiment of the present invention will be described.

A gas generator 47 shown in FIG. 10 is for operating a seatbelt pretensioner of an automobile, similarly to the gas generator 50 described above. In FIG. I0, components having the same functions as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted. '

FIG. 10 differs from FIG. 1 in that a cup-shaped separator 37 is provided in the first cuff 45 in place of the epoxy resin sealing member 51. is there.

In the gas generator 47 shown in FIG. 10, the holder 44 and the plug portion B of the igniter 38 are formed of resin and integrated. The first cutlet. 45 has a large-diameter cylindrical part 45a, a medium-diameter cylindrical part 45b, and a small-diameter 45c cylindrical part, and has a bottomed cylindrical shape that expands in two stages from the bottom side. I have. Steps 4 la and 41 b are formed on the inner peripheral side of the boundary between the large, medium and small cylindrical portions.

One night of Separe 3 7 is cut off to cover the igniter 3 8. It is formed in a shape and arranged in the holder 44. Part of the outer peripheral surface of the separator 37, specifically, the opening side has a diameter such that it contacts the inner peripheral surface of the medium-diameter cylindrical portion 45b of the first cup, or is slightly more than that. It is set to a small diameter. The separator functions as an obstruction for the first forceps filled with the gas generating agent, and shuts off the igniter and the gas generating agent in the first cup. At the opening end of the separator 37, a flange portion 37a is formed which protrudes to the inner peripheral surface of the large-diameter cylindrical portion 45a of the first cup. The flange portion 37a contacts the opening-side step portion 41a of the first cup 45 to form the first cuff. The holder 44 in which the position of the separator 37 is determined in the holder 45 is provided with a metal insert 46 in the body. The insert 46 is a ring-shaped plate, and forms a flange projecting from the holder 4. The flange portion 37a of the separator 37 is brought into contact with the step portion 41a of the first cuff '45, and one surface of the metal insert 42 is brought into contact with the flange portion 37a via a ring 39. Contact. In this state, the open end of the first power button 45 is bent on the other surface of the metal insert 42 to thereby form the flange portion 37a of the separator 37 and the metal insert. 4 and 2 are swaged together with the first cup 45.

At this time, the first cutlet. The step portion 41 of 4 5 and the flange portion 37 a of the separator 37 are pressed against the metal insert 42 side, and the ring 39 is deformed to seal each other. Also, the gas generated by the separator On the crude drug 14 side, a score of 40 is provided.

Due to the structure described above, the gas generator 47 has an amount of leakage from the space S in the first cup 45 of 1.9 × 10 ⁻³ [Pa-mVsec] or less. This is a gas generator with excellent environmental resistance.

(Example of Embodiment 11)

Next, an eleventh embodiment of the present invention will be described.

A gas generator 49 shown in FIG. 11 is for operating a seatbelt pretensioner of an automobile similarly to the gas generator 50 described above. In FIG. 1, those having the same functions as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

11 is different from FIG. 1 in that a first cuff is used instead of the epoxy resin sealing member 51. 3 in 6 cutlet. This is the point where a separate separation 37 was set up.

In the gas generator 49 shown in FIG. 1i, the embolization portion B of the holder 48 and the igniter 38 is formed of resin and integrated.

The first knife "36" has a large-diameter cylindrical portion 36a, a medium-diameter cylindrical portion 36b, and a small-diameter 36c cylindrical portion, and has a bottomed cylinder that expands in two stages from the bottom side. Steps 41a and 41b are formed on the inner peripheral side of the boundary between the large, medium and small cylindrical portions.

The separator 37 is formed in a cup shape so as to cover the igniter 38 and is disposed on the holder 48. A part of the outer peripheral surface of the separator 1.37, specifically, the opening side has a diameter such that it contacts the inner peripheral surface of the medium-diameter cylindrical portion 36b of the first force sop, or more. Is also set to a slightly smaller diameter. The separator functions as an obstruction for a first forceps filled with the gas generating agent, and shuts off the igniter and the gas generating agent in the first cup. At the open end of the separator 37, a large-diameter cylindrical portion 36a of the first cuff is provided. A flange portion 37a protruding to the inner peripheral surface is formed. The flange portion 37a is the first cuff. The position of the separator 37 in the first cup 36 is determined by contacting the opening side step 41 a of the holder 36.The holder insert 48 is provided with a metal insert 42 on the body. ing. The insert 42 is a cylindrical body and forms a flange projecting from the boulder 48.

The first cutlet. 36 The flange portion 37a of the separator 37 is abutted against the step portion 41a, and one end of the metal insert 42 is abutted on the flange portion 37a via the ring 39. Let it. In this state, the opening end of the first cup 36 is bent over the other end of the metal insert 42, whereby the flange portion 37a of the separator 37, the metal insert 42, and the first Swage the cups 3 and 6 together.

At this time, the step part 41 a of the first cup 36 and the flange part 37 a of the separator 37 are pressed against the metal insert 42 side, and the 〇 ring 39 is deformed and The space is sealed. Further, a score 40 is provided on the gas generating agent 14 side of the separator 37.

The gas generator 4-9, the structure described above, a leakage amount of leakage from the space S of the first cup 3 in 6, 1. 9 × 10 one ³ - is a [Pa mVsec] or less. This is a gas generator with excellent environmental resistance.

As can be seen from the plurality of embodiments, the seal member is a ring, the seal member is made of the epoxy adhesive, the seal member is made of the sheet packing, the silicon sealant containing silicon as a main component, Means such as the above-mentioned welding by YAG laser welding and the integral molding of the plug, the separator and the holder and the plug B of the igniter are all performed from the space S in the first cup that stores the gas generating agent. This is a useful tool to control the amount of leaks. You. The present invention relates to all gas generators that reduce the amount of leakage from the space S in the first cup to 1.9 × 10 ⁻³ [Pa-mVsec]. Is included.

(Preferred gas generating agent)

As a gas generating agent that can be used in the gas generator of the present invention, a conventional smokeless explosive may be used. However, as the gas generating agent that can be used in the gas generator of the present invention, a gas generating agent containing a nitrogen-containing organic compound as a fuel component, an inorganic compound as an oxidizing component, and at least one or more additives is preferable.

Examples of the fuel component include at least one or more selected from the group consisting of aminotetrazole, guanidine nitrate, and nitroguanidine. Examples of the oxidizer component include at least one selected from the group consisting of strontium nitrate, ammonium nitrate, potassium nitrate, ammonium perchlorate, and potassium perchlorate.

Help! ] Products include molybdenum trioxide, which is a self-igniting catalyst. Further, other additives that can be added to the gas generating agent include a binder, and the binder is at least one selected from the group consisting of guar gum, methylcellulose, carboxymethylcellulose, 7-soluble cellulose ether, and polyethylene glycol. Species or more.

Suitable gas generating agents include 5-aminotetrazole and guanidine-5-sodium acid as fuel components, strontium nitrate and ammonium perchlorate as oxidizer components, molybdenum trioxide as autoignition catalyst, and guar gum as binder. Is a gas generating agent. More preferably, 1 0-3 0 weight of 5-aminotetrazole as the fuel component ^_0/0, 1 5 to 3 5 mass nitrate Guaniji emissions ^_0/0, I 0 ~ 3 0 mass strontium nitrate as an oxidizer component %, 1 5 to 3 5 mass perchlorate Anmoniumu ^0/6, tactile pyrophoric 1 to 1 0 mass Sansani匕molybdenum medium ^0/6, a gas generator containing from 1 to 1 0 weight ^_0/0 Guaga beam as a binder.

(Production method of gas generating agent)

The method for producing these gas generating agents will be described. Measure each component of the gas generating agent to a specified amount. After weighing, mix each component thoroughly with a V-type mixer. The mixture was added 1 0-3 0 weight ^_0/0 of water, further mixing. The wet mixture is kneaded with a kneader to obtain a sticky mass. This is formed into a desired shape by a vacuum extruder. This is dried at 60 ° C. for 15 hours and then at 100 ° C. for 5 hours to obtain a desired gas generating agent.

(Igniter)

The igniter that can be used in the present invention is not particularly limited. In addition, the ignition ball may contain a component that suppresses corrosion of the electric wire, for example, a basic substance such as magnesium carbonate. However, it is possible to use an ignition device that does not use an ignition ball.

(Demonstration

Hereinafter, an example of the present invention will be described in more detail. In the following examples, the same type of ignition device, gas generating agent, and ignition device were used.

Example 1

A gas generator 50 as shown in FIG. 1 was prepared. First, the igniter 1 2 was fixed by caulking to the holder 9 via the o-ring 13. Next, the first cutlet. In 10, 1 g of smokeless powder was weighed and filled as a gas generating agent 14. The holder 9 to which the ignition device 12 was fixed was inserted into the first forceps 10 filled with the gas generating agent 14 and fixed by caulking. Finally, an epoxy adhesive was applied to the swaged portion of the first cup of the holder 9 and dried to form a seal member 51. The first cut of the gas generator 50. The amount of leakage from 10 is measured by the volume detection type leak test unit LUW-7.07 1 manufactured by Cosmo Instruments Co., Ltd. The measurement was performed using.

The results of the humidity test and the ignition delay time measurement of the gas generator 50 thus obtained are shown in Table 1 in FIG. Here, the humidity test was performed as follows in order to observe the corrosion of the bridge bridge F in the igniter 12 incorporated in the gas generator 50 by steam. After maintaining the gas generator for 100 hours at a temperature of 80 ° C and 95%, measure the resistance value between the electrode pins A of the igniter i2 incorporated in the gas generator 50. It was done by doing. The ignition delay time was measured for the purpose of observing the deterioration of the gas generating agent 14 and the ignition agent D. The time when the gas generator 50 was energized was set to 0, and the ignition delay time was measured by calculating the time required for the pressure to rise in a tank having an internal volume of 18 cc.

Example 2

A gas generator 53 as shown in FIG. 2 was created. First, the igniter 1 2 was fixed by caulking to the holder 9 via the 0 ring 13. Next, 1 g of smokeless powder as the gas generating agent 1 was weighed and filled in the first nipple 10. The holder 9 to which the firearms 1 and 2 were fixed was inserted into the first forceps 10 filled with the gas generating agent 14 via the sealing member 52 made of sheet packing, and fixed by caulking. .

The measurement of the leakage amount from the first cuff 10 of the gas generator 53 thus obtained, the humidity test, and the ignition delay time measurement were performed in the same manner as in Example 1. The results are shown in Table 1 in Table 14.

Example 3

A gas generator 55 as shown in FIG. 3 was created. First, the igniter 11 was fixed to the holder 9 by caulking via the ring 13. Next, 1 g of a smokeless powder as the gas generating agent 14 was weighed and filled in the first cup 10. The surface of the holder 9 to be in contact with the flange 10 d of the first cup 10 Apply concealing agent 54 and dry. Thereafter, the holder 9 was inserted into the first cup 10 filled with the gas generating agent 14, and the first cup 10 was fixed to the holder 9 by caulking.

The properties of the silicone sealant 54 used at this time are shown below.

Appearance: liquid Viscosity: 8 Pas

Specific gravity: 1.04 (25 ° C) Hardness: 20 (JIS-A)

Tensile strength: 2. O M Pa Elongation: 250%

Drying time: 60 minutes Aluminum shear adhesive strength: 0.9 MPa In use, silicone sealant 54 was diluted with toluene and applied as follows.

Silicon sealant: toluene = 1: 5: 85 (weight ratio) The leak amount of the gas generator 55 was measured in the same manner as in Example 1.

The first cutoff of the gas generator 55 obtained in this way. The measurement of the leakage amount from 10, the humidity test, and the ignition delay time measurement were performed in the same manner as in Example 1. The results are shown in Table 1 in Table 14.

Example 4

A gas generator 57 as shown in FIG. 5 was created. First, the igniter 12 was fixed to the holder 9 by caulking via the ring 13. Next, the first cutlet. 1 g of smokeless powder was weighed and filled as gas generating agent 14 in ί0. The ignition device 12 was inserted into the first forceps 10 filled with the gas generating agent 14 in the holder 9 to which the firearms 12 were fixed, and fixed by caulking. The swaging 9a of the holder 9 and the first force, soft. The contact portion with 10, that is, the caulked portion was welded by a YAG laser. Since the caulked portion was formed over the entire outer peripheral surface of the first cup 10, the entire periphery was welded with a YAG laser to form a welded portion 56. The first knife of the gas generator 57 obtained in this way. The measurement of the leakage amount from 10, the humidity test, and the ignition delay time measurement were performed in the same manner as in Example 1. The results are shown in Table 1 in Table 14.

Comparative Example 1

A gas generator 108 as shown in FIG. 13 was made. First, the igniter 104 was fixed to the holder 101 via a 0-ring 105 by caulking. Next, 1 g of a smokeless powder as a gas generating agent 106 was weighed and charged in the first force 102. A first knife in which a holder 101 to which an igniter 104 is fixed is filled with a gas generating agent 106. 1 20 62 was inserted and fixed by swaging. The first cuff of the conventional gas generator 108 thus obtained. The measurement of the leakage amount from 102, the humidity test, and the measurement of the ignition delay time were performed in the same manner as in Example 1. The results are shown in Table 1 in Table 14.

In Table 1 shown in the first 4 figures, in Examples 1 to 4, the amount of leakage are all L 9xl0- ³ [Pa - mVsec] or less. The change in the resistance value between the electrode pins of the igniter due to the humidity test is less than 0.01 Ω, and the performance of the gas generator does not decrease.

However, in Comparative Example 1 in which the leak amount was larger than 1, 9x10-1 ^: '[Pa · mVsec], the change in resistance between the electrode pins of the igniter in the humidity test was 0.82 Ω. . This indicates that the corrosion of the lightning wire of the igniter is progressing. This indicates that such a gas generator could break and become inoperable during a long vehicle installation of 15 years. Further, in the first to fourth embodiments, the ignition delay time is as short as less than 2 ms. However, in Comparative Example 1, the ignition delay time was 14.5 ms due to the deterioration of the gas generating agent and the ignition charge. With such a gas generator, the performance of a seatbelt pretensioner etc. cannot be fully demonstrated. Industrial applicability

Any of the gas generators of the present invention described above has achieved prevention of the deterioration of the performance of the igniter ゃ the deterioration of the performance of the gas generating agent, such as moisture and water vapor, from entering the inside of the first force 'soft'. Things. Therefore, it is optimal as a gas generator with excellent environmental resistance.

Claims

The scope of the claims

1. A first cup body that is filled with a gas generating agent that generates gas by combustion, and a second power cup that is disposed inside the first power-off unit and stores an igniting agent that is ignited by energization. A gas generator comprising: a igniter having the first power supply and a holder for fixing the igniter and sealing the gas generating agent and the igniter in the power supply body;

Wherein the first force-up body space, amount of leakage 1. 9x10- ³ from the space - the gas generator is [P a mVsec] following the enclosed space.

2. The gas generator according to claim 1, wherein a seal member made of an adhesive, an O-ring, or a sheet packing is provided at a joint between the holder and the first forceps. .

3. 2. The gas generator according to claim 1, wherein a silicon sealing agent containing silicon as a main component is used as a sealing means at a joint between the holder and the first forceps.

4. The gas generator according to claim 1, wherein a joint between the holder and the first forceps is welded.

5. The gas generator according to claim 1, further comprising a separator for enclosing the gas generating agent in the first forceps and blocking the gas generating agent from the first forceps.

6. The gas generator according to claim 1, wherein the holder and the plug of the second cup are formed on the body.

7. The gas generator according to claim 1, wherein a seal member made of an O-ring or a sheet packing is provided at a joint between the holder and the igniter.

8. A pretensioner comprising the gas generator according to claim 1 as a gas generator.