JP2008279914A - Gas generator for airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas generator for an airbag device making an occupant relaxed by releasing aroma into an automobile in operation. <P>SOLUTION: An aroma generation label 1a is attached to a ceiling surface 12a of a diffuser shell 12 of the gas generator 10. A operation, by burning of a gas generating agent 17, the ceiling surface 12a also becomes a high temperature. By the heat, the aroma is emitted from the perfume retained in the aroma generation label 1a and after it flows into an air bag, it is discharged from a vent hole and is released into the vehicle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an aroma generating label applied to a gas generator for an air bag apparatus that is an occupant restraint device for a vehicle, and a gas generator for an air bag apparatus capable of emitting an aroma during operation.

  Even if the vehicle accident occurred and the airbag or seatbelt was not important, the passenger who panicked from the impact of the collision would fall by rushing outside without checking the surroundings. There is also a risk of injury and a new accident. Taking calm action after an accident occurs is also important from the viewpoint of preventing secondary accidents.

  In order to relax the occupant of a vehicle when an accident occurs, a device for generating a fragrance has been devised. In order to generate a fragrance component at the time of operation of a gas generator for an air bag, there is one in which a fragrance component is added to a pressurized gas of a gas generator containing a pressurized gas. Exists.

Patent Document 1 discloses mixing an aroma component with a pressurized gas in a hybrid that uses a solid gas generating agent and a pressurized gas in combination, or in a cold type gas generator that uses only a pressurized gas.
EP 1541428

  In the case of a pyro-type gas generator that uses a solid gas generating agent as a gas generating source, the combustion temperature of the solid gas generating agent is about 800 ° C. or more, although it varies depending on the type of gas generating agent. For this reason, when an aroma component is added to the inside of the gas generator, the aroma component may be thermally decomposed during combustion, and a predetermined aroma imparting effect may not be exhibited. The adverse effect of the gas is also considered.

  The present invention provides a fragrance generating label that, when applied to a gas generator using a solid gas generating agent, reliably generates fragrance and can exert an effect of relaxing an occupant at the time of an accident by the fragrance. Is an issue.

  An object of the present invention is to provide a gas generator for an air bag apparatus that can generate an aroma reliably in a gas generator using a solid gas generating agent and can exert an effect of relaxing an occupant at the time of an accident by the aroma. Is another issue.

[Claim 1]
As a means for solving one problem, the present invention provides:
It has a base material to be bonded to an adhesion target on one side and a protective sheet that covers the other surface of the base material, and a fragrance is held between the base material and the protective sheet, and the protective sheet is heated by heat. The present invention provides a fragrance generating label that is used by being attached to a gas generator using a gas generating agent, which melts and opens and the fragrance is volatilized by heat to generate fragrance.

  Among gas generators used in airbag devices, a gas generator that uses only a solid gas generating agent as a gas generating source is a disk-type pyrolyzer having an outer shell formed by a housing in which a diffuser shell and a closure shell are combined. There are known a gas type generator, a cylinder type pyro type gas generator in which an outer shell is formed by a cylindrical housing closed at both ends. These are for inflating an air bag by a high-temperature combustion gas generated from a gas generator that has been ignited and combusted by the operation of a built-in electric igniter. The present invention can also be applied to a hybrid inflator that uses a solid gas generating agent and a pressurized gas in combination as a gas source.

  The housing of the pyro type gas generator is generally made of stainless steel or aluminum, and the thickness is about 1 to 2.5 mm for stainless steel and about 2 to 5 mm for aluminum. As described above, although the temperature varies depending on the type of the gas generating agent, the temperature during combustion of the gas generating agent is about 800 ° C. or more, so the electric igniter is activated and the gas generating agent is ignited and burned. When gas is generated, the outer surface temperature of the housing also rises in a short time.

  Therefore, the fragrance generating label of the present invention generates a fragrance by applying the increase in the outer surface temperature of the housing by being affixed to the outer surface of the housing. The fragrance generating label of the present invention only needs to be attached to the housing after the gas generator is assembled, and it is only attached from the outside. Therefore, it does not require a special increase in man-hours or complicated means. It does not adversely affect the functioning of the generator.

  The fragrance generating label of the present invention can be formed into a desired shape such as a circle, a square, a rectangle, a strip, a donut, a fan, a cylinder, etc., depending on the outer shape to be applied.

  As the base material of the fragrance-generating label of the present invention, metal foils such as aluminum and stainless steel having good heat conductivity, various synthetic resin sheets, non-woven fabrics and the like can be used. When using a synthetic resin sheet or non-woven fabric as the material of the base material, the melting point is considered in consideration of various situations in which the vehicle is used (for example, when parked outdoors for a long time in summer). What is 150 degreeC or more is preferable.

  The protective sheet for the fragrance-generating label of the present invention may be any one having no opening such as a hole or one having an opening such as a hole (for example, a mesh-shaped one). In the case where there is no opening such as a hole, it may be anything that can be melted and opened at least partially in response to the temperature rise of the outer surface of the housing. The opening of the protective sheet means that the protective sheet is deformed by heat to form holes and cracks, and the holes and cracks may be of a size and number that can release volatilized fragrance.

  The protective sheet may be composed of two or more layers. For example, the first protective sheet can be made into a mesh having a material with a high melting point, and the second protective sheet laminated thereon can be made into a film having a material with a low melting point. In the case of such a two-layer protective sheet, the second protective sheet is easily melted, and the melt adheres to and opens the yarn portion forming the mesh, so that the perfume can be protected and volatilized more easily. Become.

  As a material of the protective sheet, a general thermoplastic resin can be used, but a material having a melting point of 150 ° C. or higher is preferable for the same reason as the base material.

  Synthetic resins used as the base material and protective sheet material include cellulose acetate (melting point 230 ° C) nylon 6 (melting point 216 ° C), nylon 6,6 (melting point 265 ° C), nylon 6,12 (melting point 217 ° C), PBT (Melting point: 232 to 267 ° C.), PET (melting point: 254 ° C.), polypropylene (melting point: 168 ° C.) and the like.

  The base material and the protective sheet may be made of the same material, or may be made of different materials.

  Since the base material and the protective sheet are in a state where the surrounding portions where no fragrance is present are in close contact (fusion, welding, adhesion, etc.), one bag is formed of the base material and the protective sheet. The fragrance | flavor exists in the inside.

  The fragrance | flavor currently hold | maintained between a base material and a protection sheet may exist as it is in the fragrance | flavor (powder form, granular form, gel form, etc.) which emits a well-known fragrance, or the said fragrance | flavor is porous particle | grains or It may be in a state of being supported on a carrier such as a sheet, or the fragrance may be formed into a powder or granule using an excipient, or a bag in which the fragrance is easily melted by heat, The thing of the state enclosed with the capsule etc. may be sufficient. When a mesh-like sheet is used as the protective sheet, the fragrance is larger than the mesh opening.

  The fragrance used in the present invention is not particularly limited, and includes a fragrance composition in which a large number of fragrances are combined. The fragrance | flavor or fragrance | flavor composition can mention what is used for well-known various fragrance | flavors etc., For example, what is described in Unexamined-Japanese-Patent No. 2002-327193 can be selected suitably, and can be used. .

[Claim 2]
As a means for solving one problem, the present invention provides:
It has a base material to be attached to the adhesion target on one side, and a protective sheet that covers the other surface of the base material, and a fragrance is held on the protective sheet, and the protective sheet is melted by heat and opened. Provided is a fragrance generating label used by being attached to a gas generator using a gas generating agent, wherein the fragrance is volatilized by heat to generate a fragrance.

  The invention of claim 2 is the same as the invention of claim 1 except that the holding state of the fragrance is different.

  The fact that the fragrance is held in the protective sheet means that the protective sheet and the fragrance are physically or chemically integrated. For example, when the fragrance is kneaded in the protective sheet, The case where the fragrance | flavor is impregnated, the case where the fragrance | flavor is embedded in the protective sheet, etc. can be mentioned. As a modification of the invention of claim 2, the base material and the fragrance may be integrated.

[Claim 3]
The present invention provides a fragrance generating label according to claim 1 or 2, wherein the fragrance is one in which the fragrance is encapsulated in a microcapsule.

  By using the microcapsules encapsulating the fragrance, it is possible to retain the fragrance and to impart a heat insulating action for preventing decomposition of the fragrance due to heat.

  The microcapsule in which the fragrance is encapsulated is preferably spherical, but may be non-spherical. Although the diameter in particular when the microcapsule with which the fragrance | flavor was enclosed is spherical shape is not restrict | limited, For example, it can select from the range of about 10 micrometers-1 mm.

  The microcapsules enclosing the fragrance can be produced by a known chemical method, physicochemical method, or mechanical method. Examples of these methods include known methods such as interfacial polymerization, in situ polymerization, submerged curing coating, submerged drying, coacervation, spray drying, and dry mixing.

[Claim 4]
The present invention provides a fragrance generating label according to any one of claims 1 to 3, wherein the fragrance generating label is a caution label attached to a gas generator for an air bag device as a solution to one problem. To do.

  The caution label describes precautions when handling the gas generator, and is attached to the outside of the housing so that the operator can easily recognize it. Therefore, by making the fragrance generating label itself a caution label, the man-hour can be made the same as the conventional one, and even when the housing is small and the attaching place is small, the work can be easily performed.

[Claim 5]
The present invention provides a solution to other problems.
A gas generator for an air bag apparatus including a gas generating agent as a gas generating source in a housing,
A gas generator for an air bag apparatus, wherein the fragrance generating label according to any one of claims 1 to 4 is fixed to an outer surface of the housing.

  When the airbag device is activated, combustion gas is ejected from the gas generator into the airbag, and the airbag is inflated. The inflated airbag contracts by releasing gas into the vehicle through a vent hole called a vent hole. By such expansion and contraction, the cushioning property of the airbag is improved, and the occupant is protected from the impact at the time of collision.

  The present invention utilizes an operation in which gas flowing into an air bag is released from a vent hole into an automobile. That is, when the combustion gas flows into the airbag from the gas generator, the fragrance also flows in simultaneously, and at the time of contraction after the inflation, the fragrance is discharged from the vent hole into the vehicle, thereby relaxing the occupant. This is to prevent the occurrence of serious accidents.

  The gas generator used in the present invention is a known one. For example, as shown in FIG. 1 of Japanese Patent Laid-Open No. 10-181516, a solid gas is contained in a disk-shaped housing composed of a closure shell and a diffuser shell. Pyro-type gas generator filled with a generating agent, as shown in FIG. 1 of Japanese Patent Application Laid-Open No. 2007-15573, a pyro-type gas generator filled with a solid gas generating agent in a cylindrical housing And a hybrid inflator using a solid gas generating agent and a pressurized gas as shown in FIG. 3 of JP-A-2003-226222. In addition, the airbag apparatus itself is also a well-known thing, For example, what is shown by FIG. 3 of Unexamined-Japanese-Patent No. 10-181516 can be mentioned.

  The fragrance generating label is attached at a position where the gas generator becomes hot when the gas generator is activated, and the fragrance can be discharged in response to the temperature rise, and the fragrance from the fragrance can flow into the airbag. Any position is acceptable. In the case of the hybrid inflator as shown in FIG. 3 of JP-A-2003-226222 as described above, it can be attached to the gas generator housing 32 in which the solid gas generating agent is accommodated.

  By using the gas generator to which the fragrance generating label of the present invention is attached, the fragrance can be released into the vehicle at the time of a vehicle accident, and the passenger in an unstable mental state due to the accident can be relaxed. For this reason, the occurrence of a secondary accident is prevented.

(1) Fragrance generation label The fragrance generation label affixed to the gas generator which uses the gas generating agent of this invention with FIG. 1 (a), (b) is demonstrated. Fig.1 (a) is sectional drawing of the thickness direction of an aroma generating label, FIG.1 (b) is sectional drawing of the thickness direction of another form of the aroma generating label.

  As shown in FIG. 1 (a), the fragrance generating label 1 a is held in a state where the fragrance 4 is sandwiched between the base material 2 and the protective sheet 3.

  The base material 2 is made of a synthetic resin sheet similar to or similar to a metal foil such as an aluminum foil or the protective sheet 3, and is affixed to an adhesion target on the side opposite to the surface on which the protective sheet 3 is laminated. In FIG. 1 (a), it has the adhesive layer 5 in which the adhesive was further apply | coated to the said opposite surface, and the release paper 6 stuck on it detachably. In addition, in the case of the usage form which apply | coats and sticks an adhesive to the said opposite surface side or the adhesion target surface side of the base material 2, the adhesive layer 5 and the release paper 6 are unnecessary.

  The thickness of the base material 2 can be appropriately set according to the strength of the material used for the base material, the place where the aroma generating label 1a is attached, the thickness of the aroma generating label 1a, and the like. It can be in the range of 1 mm.

  The protective sheet 3 includes cellulose acetate (melting point 230 ° C.) nylon 6 (melting point 216 ° C.), nylon 6,6 (melting point 265 ° C.), nylon 6,12 (melting point 217 ° C.), PBT (melting point 232 to 267 ° C.), PET (Melting point 254 ° C.), made of resin selected from polypropylene (melting point 168 ° C.) and the like.

  The thickness of the protective sheet 3 can be appropriately set according to the strength of the material used for the protective sheet, the place where the aroma generating label 1a is applied, the thickness of the aroma generating label 1a, and the like. It can be in the range of 1 mm.

  The base material 2 and the protective sheet 3 may be integrated using an adhesive, or may be integrated by heat fusion as long as they are technically possible materials.

  The fragrance | flavor 4 can use what used the well-known fragrance | flavor as it is, shape | molded into the desired shape using the excipient | filler, or encapsulated in the microcapsule.

  As shown in FIG. 1 (a), the fragrance generating label 1b has a base material 2 and a protective sheet 3, and the fragrance 4 is contained in a state embedded in the protective sheet 3, so that the fragrance is generated. It is different from the label 1b.

  Although the thickness of the fragrance generation labels 1a and 1b can be appropriately set according to the gas generator to be attached, it can be set in the range of about 100 μm to 2 mm.

  When the fragrance generating labels 1a and 1b are used as caution labels to be affixed to the gas generator, the fragrance generating labels 1a and 1b may be directly printed on the surface of the protective sheet 3 or may be affixed on the protective sheet 3 on another sheet . However, when using the other sheet, it is necessary that the function of the protective sheet 3 is not hindered. For example, the protective sheet 3 may be made of a mesh made of a material having a high melting point, and a sheet made of a material having a low melting point may be stuck thereon, and printed on the sheet made of the material having a low melting point.

(2) Gas Generator of FIG. 2 Next, the gas generator using the fragrance generating label shown in FIG. 1 will be described with reference to FIG. FIG. 2 is an axial sectional view of the gas generator 10 of the present invention.

  The gas generator 10 shown in FIG. 1 is exactly the same as the gas generator shown in FIG. 1 of Japanese Patent Laid-Open No. 10-181516 except that the aroma generating label 1a is attached.

  The gas generator 10 has a housing 11 in which a diffuser shell 12 and a closure shell 13 are integrated by welding as an outer shell. An electric igniter 15, a charge transfer agent 16, a solid gas generating agent 17, a coolant filter 20, and the like are accommodated in the housing 11. On the peripheral surface of the diffuser shell 12, a plurality of gas discharge ports 19 are formed that are closed from the inside with a seal tape 18.

  The solid gas generating agent 17 can be appropriately selected from known ones. For example, guanidine nitrate 5 to 60% by mass, basic copper nitrate 10 to 85% by mass, carboxymethyl cellulose sodium salt 20% by mass or less, water Aluminum oxide 0.1-20 mass% (combustion temperature 1200-1700 degreeC) can be used.

  A circular fragrance generating label 1 a is attached to the central portion of the outer ceiling surface 12 a of the diffuser shell 12. The aroma generating label 1a is affixed by peeling off the release paper 6 and pressing the adhesive layer 5 on the outer ceiling surface 12a. When the gas generator 10 is shipped with the fragrance generating label 1a attached, a sheet as a protective material is further provided on the protective sheet 3 for the purpose of preventing damage to the protective sheet 3 during transportation. Can be pasted.

  Next, the operation of the gas generator 10 will be described with reference to FIGS. FIG. 3 is a partial schematic view of an airbag apparatus using the gas generator of FIG. 2, and is substantially the same as the airbag apparatus shown in FIG. 3 of Japanese Patent Laid-Open No. 10-181516.

  When a sensor (not shown) senses the impact of the vehicle, the igniter 15 is activated by the signal, thereby igniting the charge 16 and generating a high-temperature flame. By this flame, the gas generating agent 17 is ignited and burned, and high-temperature combustion gas is generated. The hot combustion gas passes through the filter 20 and is cooled, and then breaks the seal tape 18 and is discharged from the gas discharge port 19 to inflate the airbag 50 as shown in FIG.

  At this time, the outer ceiling surface 12 a is heated directly by heat transfer from the filter 20, and thus the temperature rises. In response to this temperature rise, the base material 2, the fragrance 4 and the protective sheet 3 are heated. Since the protective sheet 3 melts and a hole is formed or a crack is generated, the fragrance volatilized from the fragrance 4 is released from the hole or crack, and this fragrance flows into the airbag 50 together with the gas. .

  And since the airbag 50 shrink | contracts with the pressure at the time of a passenger | crew colliding after being protected from the impact at the time of a vehicle collision by the passenger | crew colliding with the inflated airbag 50, the fragrance in the airbag 50 is included. A part of the gas is discharged from the vent hole 51.

  The gas containing the fragrance discharged from the vent hole 51 is released into the vehicle, and the fragrance relaxes the occupant in an unstable mental state due to the accident. Generation can be expected to be prevented.

(3) Gas Generator in FIG. 4 A gas generator 100 according to another embodiment will be described with reference to FIG. FIG. 4 is an axial cross-sectional view of a gas generator that is another embodiment of the present invention. The gas generator shown in FIG. 4 is exactly the same as that shown in FIG. 1 of Japanese Patent Application Laid-Open No. 2007-15573 except that an aroma generating label 1a is attached.

  The inside of the cylindrical housing 111 is partitioned into two, a first combustion chamber 130a and a second combustion chamber 130b, and gas discharge ports 119a and 119b that are closed from the inside by a sealing tape are formed around the periphery. Yes.

  A first filter 120a is disposed in the first combustion chamber 130a and is filled with a first gas generating agent 117a. A second filter 120b is disposed in the second combustion chamber 130b and is filled with a second gas generating agent 117b. The volume of the first combustion chamber 130a is larger than that of the second combustion chamber 130b, and the amount of the filled gas generant is also increased.

  A first igniter 115a is attached to the end of the first combustion chamber 130a, and a second igniter 115b is attached to the end of the second combustion chamber 130b.

  The fragrance generating label 1a is attached in a state of being wound around the outer surface of the cylindrical housing 111 excluding the gas discharge port 119a on the first combustion chamber 130a side. In the gas generator having two combustion chambers, in order to inflate the airbag in an optimum state according to the collision state of the vehicle, when the two igniters are operated simultaneously, the two igniters are separated with a time difference. When activated, only one igniter may be activated. For this reason, considering the case where only one igniter operates, it is desirable that the fragrance generation label 1a is attached to the first combustion chamber 130a (combustion chamber containing a gas generating agent that always burns during operation).

  When the gas generator 100 shown in FIG. 4 is attached to the airbag apparatus, the occupant can be relaxed by releasing the fragrance into the automobile after the collision in the same manner as the gas generator 10 shown in FIG. it can.

(A), (b) is sectional drawing of the fragrance generating label of this invention. Sectional drawing of the gas generator using the fragrance generation label of Fig.1 (a). The partial schematic of the airbag apparatus using the gas generator of FIG. Sectional drawing of the gas generator of another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b Fragrance generating label 2 Base material 3 Protection sheet 4 Fragrance | flavor 5 Adhesive layer 6 Release paper 10 Gas generator for airbag apparatuses 11 Housing 12 Diffuser shell 13 Closure shell

Claims (5)

  It has a base material to be bonded to an adhesion target on one side and a protective sheet that covers the other surface of the base material, and a fragrance is held between the base material and the protective sheet, and the protective sheet is heated by heat. An aroma generating label which is used by being attached to a gas generator using a gas generating agent, which melts and opens and the fragrance is volatilized by heat to generate a fragrance.   It has a base material to be attached to the adhesion target on one side, a protective sheet that covers the other surface of the base material, and a fragrance is held on the protective sheet, and the protective sheet is melted by heat and opened. A fragrance generating label used by being attached to a gas generator using a gas generating agent, wherein the fragrance is volatilized by heat to generate a fragrance.   The fragrance generating label according to claim 1, wherein the fragrance is a fragrance encapsulated in a microcapsule.   The fragrance generating label according to any one of claims 1 to 3, wherein the fragrance generating label is a caution label attached to a gas generator for an air bag device. A gas generator for an air bag apparatus including a gas generating agent as a gas generating source in a housing,
A gas generator for an air bag apparatus, wherein the fragrance generating label according to any one of claims 1 to 4 is fixed to an outer surface of the housing.

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