Patent Application
20130276664
The present invention relates to a gas generator incorporated in a passenger protection apparatus, and more particularly to what is called a disc type gas generator incorporated in an air bag apparatus equipped in a steering wheel or the like of a car.
From a point of view of protection of a driver and/or a passenger in a car or the like, an air bag apparatus which is a passenger protection apparatus has conventionally widely been used. The air bag apparatus is equipped for the purpose of protecting a driver and/or a passenger against shock caused at the time of collision of a vehicle or the like, and it receives a body of a driver or a passenger with an air bag serving as a cushion, as the air bag is expanded and developed instantaneously at the time of collision of the vehicle or the like. The gas generator is equipment which is incorporated in this air bag apparatus, an igniter therein being ignited in response to power feed through a control unit at the time of collision of a vehicle or the like to thereby burn a gas generating agent with flame caused by the igniter and instantaneously generate a large amount of gas, and thus expands and develops an air bag. It is noted that the air bag apparatus is equipped, for example, in a steering wheel, an instrument panel, or the like of a car.
Gas generators of various structures are available, and in particular, what is called a disc type gas generator is available as a gas generator suitably made use of for a driver-seat-side air bag apparatus equipped in a steering wheel or the like. In general, the disc type gas generator has a short cylindrical housing of which axial end portions are closed, a gas discharge opening being provided in a circumferential wall of the housing, and the housing accommodating a gas generating agent, an igniter, a filter, and the like.
The housing of the disc type gas generator is generally constituted of combination of a cylindrical metal member with bottom called a lower shell and a cylindrical metal member with bottom called an upper shell. Of these shells, the lower shell forms at least a bottom plate portion of the housing, to which the igniter is assembled and fixed.
A shape of the upper shell has conventionally relatively been simple, and hence it has generally been fabricated by press-working one plate-shaped member made of metal. In contrast, since a shape of a portion of the lower shell to which the igniter is to be assembled has been complicated, the lower shell has generally been fabricated by cutting that portion (a portion of the lower shell to serve as an igniter fixation portion). Fabrication of the lower shell through such cutting, however, has put significant pressure on manufacturing cost, and hence improvement thereof has been demanded.
Then, an attempt to simplify a construction of the lower shell, fabricate the lower shell by press-working one plate-shaped member made of metal, and fix an igniter to the lower shell fabricated by press-working by means of a resin-molded portion through insert molding has been made. For example, Japanese Patent Laying-Open No. 4-266548 (PTD 1), Japanese National Patent Publication No. 2005-528276 (PTD 2), Japanese National Patent Publication No. 2007-521181 (PTD 3), Japanese Patent Laying-Open No. 2010-173558 (PTD 4), Japanese Patent Laying-Open No. 2010-173559 (PTD 5), Japanese Patent Laying-Open No. 2010-173560 (PTD 6), and the like are exemplified as documents disclosing such a construction.
In the gas generator disclosed in any of the documents above, such a construction that an igniter is assembled to a lower shell formed by press-working one plate-shaped member made of metal through insert molding with a resin material serving as a source material has been adopted. More specifically, an insulating fluid resin material is poured into a space between the lower shell and the igniter arranged in an opening provided in the lower shell and then solidified, to thereby form a resin-molded portion, and the resin molded portion is secured to a surface of the igniter and a surface of the lower shell, so that the igniter is fixed to the lower shell.
In a case where the construction as disclosed in any of the documents above is adopted, however, exposure of the igniter to a high-temperature and high-pressure environment during insert molding gives rise to a problem. Namely, since the igniter is a part in which an ignition agent or the like sensitively reactive to static electricity, flame, or the like is loaded, handling thereof requires great care. Exposure of the igniter to the high-temperature and high-pressure environment as above, however, involves considerable difficulty in ensuring safety in assembly operations. Then, the assembly operations are significantly restricted, which has resulted in impediment to easy manufacturing of a gas generator.
Therefore, the present invention was made to solve the problems described above, and an object thereof is to provide a gas generator which can achieve reduced cost, have less restriction in assembly operations, and can safely and readily be manufactured.
A gas generator based on the present invention includes a housing, an igniter, and a holding portion. The housing is made of a short cylindrical member which is constituted of a top plate portion and a bottom plate portion closing axial end portions and a circumferential wall portion provided with a gas discharge opening and includes therein a combustion chamber accommodating a gas generating agent. The igniter serves for burning the gas generating agent. The holding portion is provided on the bottom plate portion and holds the igniter. The housing at least has a lower shell including the bottom plate portion and an upper shell including the top plate portion, and the lower shell includes a protruding cylindrical portion provided to protrude toward the top plate portion and an opening provided at an axial end portion of the protruding cylindrical portion, which is located on a side of the top plate portion. The holding portion is formed from a resin-molded portion which is formed by attaching a fluid resin material to the bottom plate portion so as to reach a part of an outer surface of the bottom plate portion from a part of an inner surface of the bottom plate portion through the opening and solidifying the fluid resin material so that at least a part of the resin-molded portion is secured to the bottom plate portion, and includes an accommodation recess portion for accommodating the igniter in a portion opposed to the top plate portion. The igniter is held by the holding portion while it is inserted in the accommodation recess portion from a side of the top plate portion and fitted in the accommodation recess portion.
In the gas generator based on the present invention above, preferably, one of the igniter and the holding portion is provided with a locking portion and the other of the igniter and the holding portion is provided with a locked portion, and in that case, preferably, the igniter is held by the holding portion as the locking portion is locked to the locked portion.
In the gas generator based on the present invention above, preferably, the locking portion has a groove portion extending along a circumferential direction, in a portion on a main surface on a side locked to the locked portion, which corresponds to a root of the locking portion.
In the gas generator based on the present invention above, preferably, the igniter may be held by the holding portion by being fixed to the holding portion with an adhesive.
The gas generator based on the present invention above may further include a first rotation prevention mechanism for preventing the igniter from rotating relative to the holding portion.
The gas generator based on the present invention above may further include a second rotation prevention mechanism for preventing the holding portion from rotating relative to the lower shell.
In the gas generator based on the present invention above, preferably, the lower shell is made of a press-formed product formed by press-working one plate-shaped member made of metal.
In the gas generator based on the present invention above, preferably, the igniter includes an agent loaded portion accommodating an agent for burning the gas generating agent and a terminal pin connected to the agent loaded portion for igniting the agent, and in that case, preferably, the terminal pin is arranged to pass through the opening in the lower shell. Moreover, in that case, a size of the opening is preferably smaller than a size of the igniter at a portion of the agent loaded portion largest in outer shape.
In the gas generator based on the present invention above, preferably, the holding portion includes an insertion hole through which the terminal pin is inserted, and preferably, the terminal pin has, in a root portion, a flexion portion formed such that a part thereof juts out. In that case, the insertion hole preferably has a site allowing reception of the flexion portion of the terminal pin in a portion facing the accommodation recess portion, and in addition in that case, the site allowing reception of the flexion portion is preferably provided only at a prescribed position in a circumferential direction around a central axis of the insertion hole.
In the gas generator based on the present invention above, preferably, the holding portion includes a female connector portion capable of receiving a male connector in a portion facing outside, and in that case, the female connector portion is preferably located within the protruding cylindrical portion.
According to the present invention, a gas generator which can achieve reduced cost, have less restriction in assembly operations, and can safely and readily be manufactured can be obtained.
An embodiment of the present invention will be described hereinafter in detail with reference to the drawings. An embodiment and a variation thereof shown below represent application of the present invention to a disc type gas generator incorporated in an air bag apparatus equipped in a steering wheel or the like of a car. It is noted that the same or common elements in the embodiment and the variation thereof shown below have the same reference characters allotted in the drawings and description thereof will not be repeated.
As shown in
Lower shell 10 and upper shell 20 are each formed in a cylindrical shape with bottom, and an outer shell portion of the housing is formed by combining and joining the shells such that open surfaces thereof face each other. Lower shell 10 has a bottom plate portion 11 and a circumferential wall portion 12 and upper shell 20 has a top plate portion 21 and a circumferential wall portion 22. It is noted that electron-beam welding, laser welding, friction welding, or the like is suitably made use of for joining lower shell 10 and upper shell 20 to each other.
A protruding cylindrical portion 13 protruding toward top plate portion 21 is provided in a substantially central portion of bottom plate portion 11 of lower shell 10, so that a depression portion 14 is formed in the substantially central portion of bottom plate portion 11 of lower shell 10. Protruding cylindrical portion 13 is a site to which igniter 40 is fixed with holding portion 30 being interposed, and depression portion 14 is a site serving as a space for providing a female connector portion 36 in holding portion 30. Here, protruding cylindrical portion 13 is formed to be in a cylindrical shape with bottom, and tapered such that an outer diameter thereof decreases toward top plate portion 21, In addition, an opening 15 in a circular shape when viewed two-dimensionally is provided at an axial end portion of protruding cylindrical portion 13, which is located on a side of top plate portion 21. Opening 15 is a site through which a pair of terminal pins 42 of igniter 40 is inserted.
As described above, lower shell 10 is fabricated by press-working one plate-shaped member made of metal. Specifically, lower shell 10 is fabricated by using a pair of molds consisting of an upper mold and a lower mold to press one plate-shaped member made of metal in a vertical direction to thereby form the plate-shaped member in a shape as illustrated.
Here, for example, a metal plate composed of stainless steel, iron steel, an aluminum alloy, a stainless alloy, or the like and having a thickness before pressing approximately not smaller than 1.5 mm and not greater than 3.0 mm is made use of as the plate-shaped member made of metal, and suitably, what is called a high tensile steel plate which is free from such breakage as fracture even at the time of application of tensile stress not lower than 440 MPa and not higher than 780 MPa is suitably made use of It is noted that, regarding a thickness after pressing, a thickness of a smallest thickness portion is preferably not smaller than approximately 1.0 mm. In addition, press-working may be carried out through hot forging or cold forging, and from a point of view of improvement in dimension accuracy, it is more suitably carried out through cold forging.
As described above, upper shell 20 is fabricated by press-working one plate-shaped member made of metal. Specifically, upper shell 20 is fabricated by using a pair of molds consisting of an upper mold and a lower mold to press one plate-shaped member made of metal in a vertical direction to thereby form the plate-shaped member in a shape as illustrated. Here, a metal plate composed of stainless steel, iron steel, an aluminum alloy, a stainless alloy, or the like can be made use of as the plate-shaped member made of metal.
Holding portion 30 is provided around protruding cylindrical portion 13 provided in the substantially central portion of bottom plate portion 11 of lower shell 10. Holding portion 30 has an inner coating portion 31 covering a part of an inner surface of bottom plate portion 11 of lower shell 10, an outer coating portion 32 covering a part of an outer surface of bottom plate portion 11 of lower shell 10, and a coupling portion 33 located within opening 15 provided in bottom plate portion 11 of lower shell 10 and continuing to each of inner coating portion 31 and outer coating portion 32.
This holding portion 30 is formed from a resin-molded portion formed by attaching an insulating fluid resin material to bottom plate portion 11 so as to reach a part of the outer surface of bottom plate portion 11 from a part of the inner surface thereof through opening 15 provided in bottom plate portion 11 of lower shell 10 and solidifying the fluid resin material. Namely, holding portion 30 is formed by injection molding with the use of a mold (more particularly, outsert molding).
For a source material for holding portion 30 formed by injection molding, a resin material excellent in heat resistance, durability, corrosion resistance, and the like after curing is suitably selected and made use of. In that case, without being limited to a thermosetting resin represented by an epoxy resin and the like, a thermoplastic resin represented by a polybutylene terephthalate resin, a polyethylene terephthalate resin, a polyamide resin (such as nylon 6 or nylon 66), a polypropylene sulfide resin, a polypropylene oxide resin, and the like can also be made use of. In a case where these thermoplastic resins are selected as a source material, in order to ensure mechanical strength of holding portion 30 after molding, glass fibers or the like are preferably contained as fillers in these resin materials. In a case where sufficient mechanical strength can be ensured only by a thermoplastic resin, however, a filler as described above does not have to be added.
Holding portion 30 is secured to bottom plate portion 11 at a surface on a side of bottom plate portion 11, of each of inner coating portion 31, outer coating portion 32, and coupling portion 33 described above. Here, holding portion 30 is provided to entirely cover protruding cylindrical portion 13 provided in bottom plate portion 11 of lower shell 10, so that protruding cylindrical portion 13 is completely buried in holding portion 30.
In a portion of inner coating portion 31 of holding portion 30, which is opposed to top plate portion 21, a holding wall portion 34 having an annular shape is erected toward top plate portion 21, so that an accommodation recess portion 35 is provided in holding portion 30. Accommodation recess portion 35 is a site for receiving and accommodating a part of igniter 40.
In a portion of outer coating portion 32 of holding portion 30, which faces the outside, female connector portion 36 is formed. This female connector portion 36 is a site for receiving a male connector (not shown) of a harness for connecting igniter 40 and a control unit (not shown) to each other, and it is located in depression portion 14 provided in bottom plate portion 11 of lower shell 10. In this female connector portion 36, a portion of terminal pin 42 of igniter 40 closer to a lower end is arranged as being exposed. The male connector is inserted in female connector portion 36, so that electrical conduction between a core wire of the harness and terminal pin 42 is established.
A pair of insertion holes 37a in a perfect circle shape when viewed two-dimensionally is provided in coupling portion 33 of holding portion 30. This pair of insertion holes 37a is a site through which a pair of terminal pins 42 of igniter 40 is inserted, and opposing ends thereof reach accommodation recess portion 35 and female connector portion 36 described above, respectively.
Igniter 40 is an ignition device producing flame and thermal particles for burning gas generating agent 61 and assembled to holding portion 30 as a part thereof is accommodated in accommodation recess portion 35 described above. Igniter 40 includes an agent loaded portion 41 in which an agent generating flame and thermal particles as it burns is loaded and a pair of terminal pins 42 connected to agent loaded portion 41 igniters having various constructions can be made use of as igniter 40, however, here, an igniter of a type in which an ignition agent and an enhancer agent are loaded in agent loaded portion 41 is made use of. It is noted that details of a structure for assembly of igniter 40 to holding portion 30 will be described later.
Agent loaded portion 41 contains an ignition agent generating flame as it is ignited and burns at the time of actuation, a resistor for igniting this ignition agent, and an enhancer agent producing a large number of thermal particles as it is ignited by the flame caused by burning of the ignition agent and it burns. The pair of terminal pins 42 is connected to agent loaded portion 41 for igniting the ignition agent.
More specifically, igniter 40 includes an igniter cup 41a made of a cup-shaped member, a base portion 41b which closes an opening end of igniter cup 41a and holds the pair of terminal pins 42 as the pins are inserted therethrough, and a lower cover 44 provided to cover a part of terminal pin 42 and base portion 41b, and has such a construction that the resistor (bridge wire) is attached to couple tip ends of the pair of terminal pins 42 inserted in igniter cup 41a to each other, the ignition agent is loaded into igniter cup 41a so as to surround or be proximate to this resistor, and the enhancer agent is loaded to be in contact with the ignition agent.
Here, a Nichrome wire or the like is generally made use of as a resistor, and ZPP (zirconium potassium perchlorate), ZWPP (zirconium tungsten potassium perchlorate), lead tricinate, or the like is generally made use of as the ignition agent. In addition, the enhancer agent should be able to reliably start burning gas generating agent 61 which will be described later, and generally, a composition or the like composed of metal powders/oxidizing agent represented by B/KNO3 or the like is employed. For the enhancer agent, a powdery enhancer agent, an enhancer agent formed in a prescribed shape by a binder, or the like is made use of. A shape of the enhancer agent formed by a binder includes, for example, various shapes such as a granule, a column, a sheet, a sphere, a cylinder with a single hole, a cylinder with multiple holes, a tablet, and the like. It is noted that igniter cup 41a and base portion 41b are generally made of metal or plastic, and lower cover 44 is generally made of plastic.
Upon sensing collision, a prescribed amount of current flows in a resistor through terminal pin 42. As the prescribed amount of current flows in the resistor, Joule heat is generated in the resistor and the ignition agent starts burning. Flame at a high temperature caused by burning burns the enhancer agent and produces a large number of thermal particles. As the enhancer agent burns, a pressure and a temperature within igniter cup 41a increase, igniter cup 41a bursts or melts, and the thermal particles are released to the outside of igniter 40.
A sealing member 50 is interposed between igniter 40 and holding portion 30. More specifically, sealing member 50 is arranged between a bottom surface and an inner circumferential surface of accommodation recess portion 35 of holding portion 30 and an outer circumferential surface of lower cover 44 of igniter 40. Sealing member 50 serves to hermetically seal a combustion chamber 60 which will be described later by air tightly sealing a gap created between igniter 40 and holding portion 30, and it is inserted in the gap during assembly of igniter 40 to holding portion 30.
A sealing member made of a material having sufficient heat resistance and durability is preferably made use of as sealing member 50, and for example, an O ring or the like made of an EPDM resin representing one type of ethylene propylene rubber is suitably made use of it is noted that hermeticity of combustion chamber 60 can further be enhanced by separately applying a liquid sealing agent to a portion where sealing member 50 is to be interposed. Here, a liquid sealing agent containing a resin material excellent in heat resistance, durability, corrosion resistance, and the like after curing is suitably selected and made use of as the liquid sealing agent, and for example, a cyanoacrylate-based resin or a silicone-based resin is particularly suitably made use of as the resin material. In addition, for the resin material, other than the resin materials described above, a phenol-based resin, an epoxy-based resin, a melamine-based resin, a urea-based resin, a polyester-based resin, an alkyd-based resin, a polyurethane-based resin, a polyimide-based resin, a polyethylene-based resin, a polypropylene-based resin, a polyvinyl chloride-based resin, a polystyrene-based resin, a polyvinyl acetate-based resin, a polytetrafluoroethylene-based resin, an acrylonitrile butadiene styrene-based resin, an acrylonitrile styrene-based resin, an acryl-based resin, a polyamide-based resin, a polyacetal-based resin, a polycarbonate-based resin, a polyphenylene ether-based resin, a polybutylene terephthalate-based resin, a polyethylene terephthalate-based resin, a polyolefin-based resin, a polyphenylene sulfide-based resin, a polysulfone-based resin, a polyether sulfone-based resin, a polyarylate-based resin, a polyether ether ketone-based resin, a polyamide imide-based resin, a liquid crystal polymer, and the like can be made use of.
Combustion chamber 60 accommodating gas generating agent 61 is located in a space surrounding a portion where holding portion 30 and igniter 40 described above are arranged, in the space inside the housing constituted of lower shell 10 and upper shell 20. More specifically, holding portion 30 and igniter 40 described above are arranged to protrude from bottom plate portion 11 of lower shell 10 toward the inside of the housing, and a space provided in a portion facing these holding portion 30 and igniter 40 is formed as combustion chamber 60.
In addition, in a space surrounding combustion chamber 60 in a radial direction of the housing, a filter 70 is arranged along an inner circumference of the housing. Filter 70 has a hollow cylindrical shape, and a central axis thereof is arranged to substantially match with the axial direction of the housing.
Gas generating agent 61 is an agent which is ignited by thermal particles generated as a result of actuation of igniter 40 and produces a gas as it burns. A non-azide-based gas generating agent is preferably employed as gas generating agent 61, and gas generating agent 61 is formed as a molding generally containing a fuel, an oxidizing agent, and an additive. For the fuel, for example, a triazole derivative, a tetrazole derivative, a guanidine derivative, an azodicarbonamide derivative, a hydrazine derivative, or the like, or combination thereof is made use of Specifically, for example, nitroguanidine, guanidine nitrate, cyanoguanidine, 5-aminotetrazole, and the like are suitably made use of. In addition, as the oxidizing agent, for example, basic nitrate such as basic copper nitrate, perchlorate such as ammonium perchlorate or potassium perchlorate, nitrate containing cations selected from an alkali metal, an alkali earth metal, a transition metal, and ammonia, or the like is made use of. As the nitrate, for example, sodium nitrate, potassium nitrate, or the like is suitably made use of. Moreover, as the additive, a binder, a slag formation agent, a combustion modifier, or the like is exemplified. As the binder, for example, metal salt of carboxymethyl cellulose, an organic binder such as stearate, or an inorganic binder such as synthetic hydrotalcite and Japanese acid clay can suitably be made use of. As the slag formation agent, silicon nitride, silica, Japanese acid clay, or the like can suitably be made use of. In addition, as the combustion modifier, a metal oxide, ferrosilicon, activated carbon, graphite, or the like can suitably be made use of.
A shape of a molding of gas generating agent 61 includes various shapes such as a particulate shape including a granule, a pellet, and a column, and a disc shape. In addition, among columnar moldings, a molding with holes having holes in the molding (such as a cylindrical shape with a single hole or a cylindrical shape with multiple holes) is also made use of. These shapes are preferably selected as appropriate depending on specifications of an air bag apparatus in which gas generator 1A is incorporated, and for example, a shape optimal for the specifications is preferably selected by selecting a shape allowing change over time of a rate of generation of a gas during burning of gas generating agent 61. Furthermore, in addition to a shape of gas generating agent 61, a size of a molding or an amount thereof for filling is preferably selected as appropriate, in consideration of a linear burning velocity, a pressure exponent, or the like of gas generating agent 61.
For example, a filter obtained by winding and sintering a metal wire rod of stainless steel or iron steel, a filter formed by press-working a mesh material into which metal wire rods are knitted to thereby pack the same, a filter obtained by winding a perforated metal plate, or the like is made use of as filter 70. Here, as the mesh material, specifically, a wire gauze of stocking stitch, a plain-woven wire gauze, an aggregate of crimped metal wire rods, or the like is made use of. In addition, as the perforated metal plate, for example, expanded metal obtained by making staggered cuts in a metal plate and forming holes by widening the cuts to thereby work the metal plate in a mesh, hook metal obtained by perforating a metal plate and collapsing burrs caused around a periphery of the hole for flattening, or the like is made use of. In this case, a size or a shape of a hole to be formed can be changed as appropriate as required, and holes different in size or shape may be included in the same metal plate. It is noted that, for example, a steel plate (mild steel) or a stainless steel plate can suitably be made use of as a metal plate, and a nonferrous metal plate of aluminum, copper, titanium, nickel, or an alloy thereof, or the like can also be made use of.
Filter 70 functions as cooling means for cooling a gas by depriving heat at a high temperature of the gas when the gas produced in combustion chamber 60 passes through this filter 70 and also functions as removal means for removing residues (slag) or the like contained in the gas. Therefore, in order to sufficiently cool the gas and to avoid emission of the residue to the outside, the gas produced in combustion chamber 60 should be caused to reliably pass through filter 70.
A plurality of gas discharge openings 23 are provided in circumferential wall portion 22 of upper shell 20 in a portion facing filter 70. This gas discharge opening 23 serves for guiding a gas which has passed through filter 70 to the outside of the housing. To a main surface of circumferential wall portion 22 of upper shell 20, which is located on a side of filter 70, a sealing member 24 is attached to close gas discharge opening 23. An aluminum foil or the like having an adhesive member applied to its one surface is made use of as this sealing member 24. Thus, hermeticity of combustion chamber 60 is ensured.
In the space inside the housing, an upper-side supporting member 62 for fixing an upper end of filter 70 to the housing is arranged at an end portion of upper shell 20 on the side of top plate portion 21. Upper-side supporting member 62 has a site abutting to top plate portion 21 of upper shell 20 and a site abutting to an inner circumferential surface of an upper end portion of filter 70.
In this upper-side supporting member 62, a cushion material 64 is arranged to be in contact with gas generating agent 61 accommodated in combustion chamber 60. This cushion material 64 is provided for the purpose of preventing gas generating agent 61 made of a molding from being crushed by vibration or the like, and a molding of ceramics fibers or a foamed resin (such as foamed silicone) is suitably made use of.
On the other hand, at an end portion of lower shell 10 on the side of bottom plate portion 11 in the space inside the housing, a lower-side supporting member 63 for fixing a lower end of filter 70 to the housing is arranged. Lower-side supporting member 63 has a site abutting to an inner bottom surface of bottom plate portion 11 of lower shell 10 and a site abutting to an inner circumferential surface of a lower end portion of filter 70.
These upper-side supporting member 62 and lower-side supporting member 63 are formed, for example, by press-working or the like a plate-shaped member made of metal, and a steel plate of common steel, special steel, or the like (such as a cold rolled steel plate or a stainless steel plate) is suitably employed. Since upper-side supporting member 62 and lower-side supporting member 63 are formed by folding a part of the plate-shaped member made of metal as described above, upper-side supporting member 62 and lower-side supporting member 63 each have moderate elasticity. Therefore, upper-side supporting member 62 and lower-side supporting member 63 are in contact with the inner circumferential surface of filter 70, so that filter 70 is held and fixed to the housing. In addition, each of upper-side supporting member 62 and lower-side supporting member 63 also has a function to prevent a gas from flowing out through a gap between the upper end of filter 70 and top plate portion 21 of upper shell 20 and a gap between the lower end of filter 70 and bottom plate portion 11 of lower shell 10.
An operation of gas generator 1A in the present embodiment will now be described with reference to
When a vehicle on which gas generator 1A in the present embodiment is mounted collides, collision sensing means separately provided in the vehicle senses collision, and based thereon, igniter 40 is actuated in response to power feed through a control unit separately provided in the vehicle. As igniter 40 is actuated, the ignition agent and the enhancer agent loaded in agent loaded portion 41 of igniter 40 burn and igniter cup 41a bursts or melts, so that a large number of thermal particles flow into combustion chamber 60.
The thermal particles which have flowed in ignite and burn gas generating agent 61 accommodated in combustion chamber 60 and a large amount of gas is produced. The gas produced in combustion chamber 60 passes through filter 70. At that time, heat is deprived of the gas through filter 70 and the gas is cooled, slag contained in the gas is removed by filter 70, and the gas flows into an outer peripheral portion of the housing.
As an internal pressure in the housing increases, sealing by sealing member 24 which has closed gas discharge opening 23 of upper shell 20 is broken, and the gas is discharged to the outside of the housing through gas discharge opening 23. The discharged gas is introduced in the air bag provided adjacent to gas generator 1A and it expands and develops the air bag.
As shown in
Specifically, as shown in
On the other hand, as shown in
In assembly, as shown in
Here, locking pawl portions 34a of holding portion 30 come in contact with the inclined lower surface of lower cover 44 of igniter 40. As described above, however, since locking pawl portions 34a and holding wall portion 34 are elastically deformable, locking pawl portions 34a and holding wall portion 34 retract radially outward, so that lower cover 44 of igniter 40 can be inserted in accommodation recess portion 35.
Then, after igniter 40 is inserted in holding portion 30, locking pawl portions 34a go beyond a side portion of lower cover 44 so that locking pawl portions 34a and holding wall portion 34 return to their original shapes and locking pawl portions 34a are locked to the inclined upper surface of lower cover 44 described above. Thus, igniter 40 is fitted in accommodation recess portion 35 while lower cover 44 thereof is accommodated in accommodation recess portion 35 of holding portion 30, and thus igniter 40 is held by holding portion 30.
It is noted that, as shown in
As described above, since gas generator 1A in the present embodiment is constructed such that igniter 40 is assembled, separately by fitting, to holding portion 30 which is the resin-molded portion formed in advance through injection molding, igniter 40 is not insert-molded at the time of injection molding of holding portion 30. Therefore, igniter 40 which is a part in which an ignition agent or the like sensitively reactive to static electricity, flame, or the like is loaded is not exposed to a high-temperature and high-pressure environment during assembly and safety during the assembly operations can be ensured. Therefore, restrictions imposed during the assembly operations are significantly lessened; for example, a place where an operation for injection molding is to be performed is not restricted.
On the other hand, since assembly of igniter 40 to holding portion 30 can be realized through an operation only for inserting igniter 40 in holding portion 30, assembly can very readily be achieved. In addition, since holding portion 30 holding igniter 40 is formed through injection molding, a specific shape thereof can variously be changed by changing a shape of a mold and a structure of a locking portion for locking igniter 40 can readily be changed to a structure suited to a shape of igniter 40. Therefore, depending on a shape of igniter 40 to be used, any shape of holding portion 30 allowing easier assembly can be selected and thus a degree of freedom in design can highly be ensured.
In addition, since holding portion 30 for fixing igniter 40 to lower shell 10 is formed by injection molding, holding portion 30 is in a state secured to lower shell 10 and sealability at that portion can sufficiently be ensured. Namely, as described above, as inner coating portion 31, outer coating portion 32, and coupling portion 33 constitute holding portion 30, a moderately long margin for securing between lower shell 10 and holding portion 30 can be ensured. Therefore, occurrence of peel-off at an interface portion between lower shell 10 and holding portion 30 can be prevented and sealability can reliably be maintained for a long period of time.
Furthermore, since holding portion 30 for fixing igniter 40 to lower shell 10 is formed by injection molding, an effect of lighter weight of the holding portion, an effect of being free from burr caused in the case of cutting, ensured reproducibility of a shape of the holding portion, and less likeliness of variation in performance, as well as an effect of ability to prevent dielectric breakdown due to occurrence of burr can also be obtained, as compared with a case where the holding portion is formed by cutting lower shell 10.
It is noted that gas generator 1A in the present embodiment described above is constructed such that a size of opening 15 provided in protruding cylindrical portion 13 of lower shell 10 is made smaller than a size of base portion 41b corresponding to a size of igniter 40 at a portion largest in outer shape of agent loaded portion 41. With the construction as such, if unexpected breakage should occur in holding portion 30, igniter 40 could be prevented from passing through opening 15 and jumping out of the housing due to increase in internal pressure in combustion chamber 60, and a safe operation of gas generator 1A would be ensured.
As shown in
With the construction as such, locking pawl portion 34a and holding wall portion 34 elastically deform, so that igniter 40 can be inserted in accommodation recess portion 35 of holding portion 30 and igniter 40 can be held by holding portion 30 in a stable manner after insertion.
On the other hand, as shown in
In a case of such a construction as well, by inserting a pair of terminal pins 42 in single insertion hole 37b, positioning of igniter 40 with respect to holding portion 30 can readily be achieved and igniter 40 can be prevented from rotating relative to holding portion 30 after assembly.
As shown in
On the other hand, as shown in
Therefore, in the case of gas generator 1B in the present embodiment as well, by inserting igniter 40 in holding portion 30 such that flat surface 44d1 provided in igniter 40 and flat surface 34d provided in holding portion 30 meet each other, positioning of igniter 40 with respect to holding portion 30 can readily be achieved and igniter 40 can be prevented from rotating relative to holding portion 30 after assembly.
As shown in
In the case of such a construction as well, by inserting igniter 40 in holding portion 30 such that flat surface 44d2 provided in igniter 40 and flat surface 33d provided in holding portion 30 meet each other, positioning of igniter 40 with respect to holding portion 30 can readily be achieved and igniter 40 can be prevented from rotating relative to holding portion 30 after assembly.
As shown in
The plurality of recess portions 16 are in a shape not continuously going around protruding cylindrical portion 13 at least along the circumferential direction (that is, a shape which is not an annular groove), and they are formed, for example, by being formed simultaneously with press-working of lower shell 10 or by providing impressions in the surface after press-working. In addition, the plurality of recess portions 16 provided in lower shell 10 are buried in inner coating portion 31 of holding portion 30 which is the resin-molded portion, and securing to lower shell 10 is achieved also in that portion.
With the construction as such, since a margin for securing between lower shell 10 and holding portion 30 can further be made greater, force of securing holding portion 30 to lower shell 10 improves, so that occurrence of peel-off at the interface portion between lower shell 10 and holding portion 30 can be prevented. In addition, even when force of securing holding portion 30 to lower shell 10 decreases, the plurality of recess portions 16 provided in lower shell 10 also function as a second rotation prevention mechanism preventing holding portion 30 from rotating relative to lower shell 10.
Though a case where a plurality of recess portions 16 are provided in a surface of protruding cylindrical portion 13 located on the side of combustion chamber 60 (that is, a surface coated with inner coating portion 31) has been exemplified above, a plurality of recess portions 16 may be provided in a surface of protruding cylindrical portion 13 located on an outer side (that is, a surface coated with outer coating portion 32), the number of recess portions 16 may be one, or in addition, the same effect can be obtained also by providing a through hole or a projection portion in protruding cylindrical portion 13 instead of a recess portion.
As shown in
More specifically, as shown in
On the other hand, lower cover 44 of igniter 40 has a plurality of locking protruding portions 44b provided to protrude outward in a circumferential surface at a site of which outer shape is formed to be greater than agent loaded portion 41 (that is, a site extending radially outward), and the plurality of locking protruding portions 44b correspond to the locking portion for fixing igniter 40 to holding portion 30. The plurality of locking protruding portions 44b are provided to align along the circumferential direction in correspondence with locking hole portions 34b provided in holding portion 30.
During assembly, as shown in
Here, locking protruding portions 44b of igniter 40 come in contact with holding wall portion 34 of holding portion 30. As described above, however, since holding wall portion 34 is elastically deformable, holding wall portion 34 retracts radially outward, so that lower cover 44 of igniter 40 can be inserted in accommodation recess portion 35.
Then, after igniter 40 is inserted in holding portion 30, locking protruding portions 44b are fitted in locking hole portions 34b so that holding wall portion 34 returns to its original shape and locking protruding portions 44b are locked to locking hole portions 34b. Thus, igniter 40 is fitted in accommodation recess portion 35 while lower cover 44 thereof is accommodated in accommodation recess portion 35 of holding portion 30, and thus igniter 40 is held by holding portion 30.
In the case of gas generator 1D in the present embodiment described above as well, an effect the same as in the case of gas generator 1A in Embodiment 1 of the present invention described above can be obtained. Namely, igniter 40 which is a part in which an ignition agent or the like sensitively reactive to static electricity, flame, or the like is loaded is not exposed to a high-temperature and high-pressure environment during assembly and safety during the assembly operations can be ensured. In addition, since assembly of igniter 40 to holding portion 30 can be realized through an operation only for inserting igniter 40 in holding portion 30, a gas generator can very readily be manufactured.
As shown in
More specifically, as shown in
On the other hand, lower cover 44 of igniter 40 has a plurality of locking recess portions 44c in a circumferential surface at a site of which outer shape is formed to be greater than agent loaded portion 41 (that is, a site extending radially outward), and the plurality of locking recess portions 44c correspond to the locked portion for fixing igniter 40 to holding portion 30. The plurality of locking recess portions 44c are provided to align along the circumferential direction in correspondence with locking protruding portions 34c provided in holding portion 30.
During assembly, as shown in
Here, locking protruding portions 34c of holding portion 30 come in contact with the inclined lower surface of lower cover 44 of igniter 40. As described above, however, since locking protruding portions 34c and holding wall portion 34 are elastically deformable, locking protruding portions 34c and holding wall portion 34 retract radially outward, so that lower cover 44 of igniter 40 can be inserted in accommodation recess portion 35.
Then, after igniter 40 is inserted in holding portion 30, locking protruding portions 34c are fitted in locking recess portions 44c so that locking protruding portions 34c and holding wall portion 34 return to their original shapes and locking protruding portions 34c are locked to locking recess portions 44c. Thus, igniter 40 is fitted in accommodation recess portion 35 while lower cover 44 thereof is accommodated in accommodation recess portion 35 of holding portion 30, and thus igniter 40 is held by holding portion 30.
Therefore, in the case of such a construction as well, an effect the same as in the case of gas generator 1D in the present embodiment described above can be obtained.
As shown in
More specifically, upper cover 45 has a cup-shaped cap portion 45a having an opening at a lower end, which covers a circumferential surface and an upper surface of igniter cup 41a, and includes at its lower end, a site in an annular shape of which outer shape is formed to significantly be greater than agent loaded portion 41 (that is, a site extending radially outward). A plurality of locking protruding portions 45b protruding outward are provided in the circumferential surface of the site, and the plurality of locking protruding portions 45b correspond to the locking portion for fixing igniter 40 to holding portion 30. The plurality of locking protruding portions 45b are provided to align along the circumferential direction in correspondence with locking hole portions 34b provided in holding portion 30.
During assembly, as shown in
Here, locking protruding portions 45b provided in upper cover 45 of igniter 40 come in contact with holding wall portion 34 of holding portion 30. Holding wall portion 34, however, is elastically deformable, and therefore holding wall portion 34 retracts radially outward, so that upper cover 45 of igniter 40 can be inserted in accommodation recess portion 35.
Then, after igniter 40 is inserted in holding portion 30, locking protruding portions 45b are fitted in locking hole portions 34b so that holding wall portion 34 returns to its original shape and locking protruding portions 45b are locked to locking hole portions 34b. Thus, igniter 40 is fitted in accommodation recess portion 35 while upper cover 45 thereof is accommodated in accommodation recess portion 35 of holding portion 30, and thus igniter 40 is held by holding portion 30. It is noted that, prior to attaching upper cover 45 to agent loaded portion 41, igniter 40 may be inserted in accommodation recess portion 35 of holding portion 30 and thereafter upper cover 45 may be attached to holding portion 30, to thereby simultaneously attach upper cover 45 to agent loaded portion 41.
In the case of gas generator 1E in the present embodiment described above as well, an effect the same as in the case of gas generator 1D in Embodiment 4 of the present invention described above can be obtained. Namely, igniter 40 which is a part in which an ignition agent or the like sensitively reactive to static electricity, flame, or the like is loaded is not exposed to a high-temperature and high-pressure environment during assembly and safety during the assembly operations can be ensured. In addition, since assembly of igniter 40 to holding portion 30 can be realized through an operation only for inserting igniter 40 in holding portion 30, a gas generator can very readily be manufactured.
It is noted that gas generator 1E in the present embodiment is constructed such that base portion 41b of igniter 40 is not covered with upper cover 45. Therefore, a flexion portion provided at an end portion of terminal pin 42 on the side of base portion 41b (that is, a root portion) is exposed in a state before assembly to holding portion 30.
Then, in gas generator 1E in the present embodiment, as shown in
Specifically, as insertion hole 37b provided in holding portion 30 is provided with retracting surface 37b1 described above, a site allowing reception of jutting portion 42b1 which is a flexion portion of terminal pin 42 is provided in a portion facing accommodation recess portion 35 and the site is provided only at a prescribed position in a circumferential direction around a central axis of insertion hole 37b1.
Here, during assembly, in a case where an orientation of igniter 40 matches with an orientation of insertion hole 37b1 provided in holding portion 30, igniter 40 can smoothly be inserted into a position where a bottom surface of base portion 41b of igniter 40 comes in contact with a bottom surface of accommodation recess portion 35, so that locking of locking protruding portions 45b described above to locking hole portions 34b can be achieved and thus igniter 40 is held by holding portion 30.
On the other hand,
Therefore, with the construction as above, occurrence of a defective condition due to insertion of igniter 40 in an incorrect orientation during assembly can be prevented.
As shown in
Here, in order to conform to a shape of a jutting portion of terminal pin 42, each of the pair of insertion holes 37a is provided with a retracting surface 37a1, so that a site allowing reception of the jutting portion which is a flexion portion of terminal pin 42 is provided in a portion facing accommodation recess portion 35 and the site is provided only at a prescribed position in a circumferential direction around a central axis of each insertion hole 37a1.
Here, during assembly, in a case where an orientation of igniter 40 matches with an orientation of insertion hole 37a1 provided in holding portion 30, igniter 40 can smoothly be inserted into a position where a bottom surface of base portion 41b of igniter 40 comes in contact with a bottom surface of accommodation recess portion 35, so that locking of locking protruding portions 45b described above to locking hole portions 34b can be achieved and thus igniter 40 is held by holding portion 30.
On the other hand,
Therefore, with such a construction as well, occurrence of a defective condition due to insertion of igniter 40 in an incorrect orientation during assembly can be prevented.
It is noted that, in the case of the construction as in the present first variation, since a part of coupling portion 33 of holding portion 30 formed from the resin-molded portion is located at a portion of igniter 40 located between the pair of terminal pins 42, a fluid resin material flows well while holding portion 30 is formed by injection molding and high moldability can also be ensured.
As shown in
More specifically, as shown in
On the other hand, upper cover 45 of igniter 40 has a plurality of locking recess portions 45c in a circumferential surface at a site in an annular shape of which outer shape is formed to be significantly greater than agent loaded portion 41 (that is, a site extending radially outward), and the plurality of locking recess portions 45c correspond to the locked portion for fixing igniter 40 to holding portion 30. The plurality of locking recess portions 45c are provided to align along the circumferential direction in correspondence with locking protruding portions 34c provided in holding portion 30.
During assembly, as shown in
Here, locking protruding portions 34c of holding portion 30 come in contact with the inclined lower surface of upper cover 45 of igniter 40. As described above, however, since locking protruding portions 34c and holding wall portion 34 are elastically deformable, locking protruding portions 34c and holding wall portion 34 retract radially outward, so that upper cover 45 of igniter 40 can be inserted in accommodation recess portion 35.
Then, after igniter 40 is inserted in holding portion 30, locking protruding portions 34c are fitted in locking recess portions 45c so that locking protruding portions 34c and holding wall portion 34 return to their original shapes and locking protruding portions 34c are locked to locking recess portions 45c. Thus, igniter 40 is fitted in accommodation recess portion 35 while upper cover 45 thereof is accommodated in accommodation recess portion 35 of holding portion 30, and thus igniter 40 is held by holding portion 30. It is noted that, prior to attaching upper cover 45 to agent loaded portion 41, igniter 40 may be inserted in accommodation recess portion 35 of holding portion 30 and thereafter upper cover 45 may be attached to holding portion 30, to thereby simultaneously attach upper cover 45 to agent loaded portion 41.
Therefore, in the case of such a construction as well, an effect the same as in the case of gas generator 1E in the present embodiment described above can be obtained.
As shown in
More specifically, as shown in
For the adhesive above, an adhesive containing a resin material excellent in heat resistance, durability, corrosion resistance, and the like after curing is suitably selected and made use of, and for example, a cyanoacrylate-based resin or a silicone-based resin is particularly suitably made use of as the resin material. In addition, for the resin material, other than the resin materials described above, a phenol-based resin, an epoxy-based resin, a melamine-based resin, a urea-based resin, a polyester-based resin, an alkyd-based resin, a polyurethane-based resin, a polyimide-based resin, a polyethylene-based resin, a polypropylene-based resin, a polyvinyl chloride-based resin, a polystyrene-based resin, a polyvinyl acetate-based resin, a polytetrafluoroethylene-based resin, an acrylonitrile butadiene styrene-based resin, an acrylonitrile styrene-based resin, an acryl-based resin, a polyamide-based resin, a polyacetal-based resin, a polycarbonate-based resin, a polyphenylene ether-based resin, a polybutylene terephthalate-based resin, a polyethylene terephthalate-based resin, a polyolefin-based resin, a polyphenylene sulfide-based resin, a polysulfone-based resin, a polyether sulfone-based resin, a polyarylate-based resin, a polyether ether ketone-based resin, a polyamide imide-based resin, a liquid crystal polymer, and the like can be made use of.
During assembly, while holding portion 30 formed from the resin-molded portion is formed in advance by injection molding in bottom plate portion 11 of lower shell 10 and an adhesive is applied to the surface of accommodation recess portion 35 of holding portion 30, igniter 40 is inserted in accommodation recess portion 35 from above (that is, the side of top plate portion 21 after assembly). Here, a pair of terminal pins 42 of igniter 40 is inserted in a pair of insertion holes 37a provided in coupling portion 33 of holding portion 30.
Thus, igniter 40 is fitted in accommodation recess portion 35 while lower cover 44 thereof is accommodated in accommodation recess portion 35 of holding portion 30. As the adhesive is cured, holding portion 30 holds igniter 40. It is noted that the adhesive may be applied to lower cover 44 of igniter 40.
In the case of gas generator 1F in the present embodiment described above as well, an effect the same as in the case of gas generator 1A in Embodiment 1 of the present invention described above can be obtained. Namely, igniter 40 which is a part in which an ignition agent or the like sensitively reactive to static electricity, flame, or the like is loaded is not exposed to a high-temperature and high-pressure environment during assembly and safety during the assembly operations can be ensured. In addition, since assembly of igniter 40 to holding portion 30 can be realized through an operation only for inserting igniter 40 in holding portion 30, a gas generator can very readily be manufactured.
As shown in
Namely, in gas generator 1G in the present embodiment, locking pawl portion 34a is provided at a tip end of holding wall portion 34, so that lower cover 44 of igniter 40 is locked by locking pawl portion 34a after assembly. In addition, an adhesive is applied between a surface of accommodation recess portion 35 of holding portion 30 and a surface of lower cover 44 of igniter 40 opposed thereto, so that holding portion 30 holds igniter 40 after assembly by means of adhesive layer 52 formed by curing of the adhesive.
In the case of gas generator 1G in the present embodiment described above as well, an effect the same as in the case of gas generator 1A in Embodiment 1 of the present invention described above can be obtained. Namely, igniter 40 which is a part in which an ignition agent or the like sensitively reactive to static electricity, flame, or the like is loaded is not exposed to a high-temperature and high-pressure environment during assembly and safety during the assembly operations can be ensured. In addition, since assembly of igniter 40 to holding portion 30 can be realized through an operation only for inserting igniter 40 in holding portion 30, a gas generator can very readily be manufactured. Moreover, in the case of gas generator 1G in the present embodiment, as in the case of gas generator 1F in Embodiment 6 of the present invention described above, it is not necessary to interpose a sealing member formed from a separate member such as an O ring between igniter 40 and holding portion 30, and therefore an effect that the number of parts can be reduced is also obtained.
As shown in
More specifically, each of a plurality of locking protruding portions 44b provided in lower cover 44 of igniter 40 has a groove portion 44b1 extending in a circumferential direction, in a portion in a main surface on a side to be locked to locking hole portion 34b serving as the locked portion (that is, the upper surface of locking protruding portion 44b in the figure) in correspondence with a root of locking protruding portion 44b.
Groove portion 44b1 is provided such that locking protruding portion 44b is more readily elastically deformable at the time of contact of locking protruding portion 44b with holding wall portion 34 during assembly, and provided to prevent plastic deformation of locking protruding portion 44b during assembly.
In the case of gas generator 1H in the present embodiment described above as well, an effect the same as in the case of gas generator 1D in Embodiment 4 of the present invention described above can be obtained.
In addition, by adopting the construction above, the root portion of locking protruding portion 44b is greatly bent at the time of assembly of igniter 40, so that locking protruding portion 44b readily elastically deforms and smooth assembly of igniter 40 to holding portion 30 can be achieved. In addition, concentration of compressive stress at the root portion of locking protruding portion 44b and resultant plastic deformation can be prevented, and stable assembly of igniter 40 to holding portion 30 can be achieved.
Namely, by adopting the construction above, not only assembly operations are facilitated, but also locking protruding portion 44b more readily returns to its original shape after assembly. Therefore, variation in accuracy in position of assembly caused by plastic deformation of locking protruding portion 44b can be suppressed, and such defective conditions as wobbling of igniter 40 after assembly or insufficient assembly strength can effectively be prevented.
In Embodiments 1 to 8 and variations thereof of the present invention described above, a case where a lower shell is formed from a press-formed product formed by press-working one plate-shaped member made of metal has been exemplified, however, limitation thereto is not necessarily intended. A lower shell formed by combination of press-working and another type of working (forging, drawing, cutting, or the like) may be employed, or a lower shell formed only by another type of working may be employed.
In addition, in Embodiments 1 to 8 and variations thereof of the present invention described above, a case where an igniter of a type in which an ignition agent and an enhancer agent are loaded in an agent loaded portion has been employed as the igniter has been exemplified, however, an igniter of a type what is called a squib in which only an ignition agent is loaded in an agent loaded portion may be employed instead.
Moreover, characteristic features of the gas generators according to Embodiments 1 to 8 and variations thereof of the present invention described above can naturally be combined with one another within the scope allowable in light of the gist of the present invention. Furthermore, a specific shape of a protruding cylindrical portion provided in a lower shell described above, a specific shape of a holding portion provided on the lower shell, a shape of an igniter fitted in the holding portion, and the like can also naturally be modified as appropriate.
Thus, each embodiment and a variation thereof above disclosed herein are illustrative and non-restrictive in every respect. The technical scope of the present invention is delimited by the terms of the claims and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
1A to 1H, 1E′ gas generator; 10 lower shell; 11 bottom plate portion; 12 circumferential wall portion; 13 protruding cylindrical portion; 14 depression portion; 15 opening; 16 recess portion; 20 upper shell; 21 top plate portion; 22 circumferential wall portion; 23 gas discharge opening; 24 sealing member; 30 holding portion; 31 inner coating portion; 32 outer coating portion; 33 coupling portion; 33d flat surface; 34 holding wall portion; 34a locking pawl portion; 34b locking hole portion; 34c locking protruding portion; 34d flat surface; 35 accommodation recess portion; 36 female connector portion; 37a, 37b, 38 insertion hole; 37a1, 37b1 retracting surface; 40 igniter; 41 agent loaded portion; 41a igniter cup; 41b base portion; 42 terminal pin; 42b1 jutting portion; 44 lower cover; 44b locking protruding portion; 44b1 groove portion; 44c locking recess portion; 44d1, 44d2 flat surface; 45 upper cover; 45a cap portion; 45b locking protruding portion; 45c locking recess portion; 50 sealing member, 52 adhesive layer; 60 combustion chamber; 61 gas generating agent; 62 upper-side supporting member; 63 lower-side supporting member; 64 cushion material; and 70 filter.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2011-001939 | Jan 2011 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2012/050176 | 1/6/2012 | WO | 00 | 7/5/2013 |
