WO2013011564A1 - 助手席用エアバッグ装置 - Google Patents
助手席用エアバッグ装置 Download PDFInfo
- Publication number
- WO2013011564A1 WO2013011564A1 PCT/JP2011/066376 JP2011066376W WO2013011564A1 WO 2013011564 A1 WO2013011564 A1 WO 2013011564A1 JP 2011066376 W JP2011066376 W JP 2011066376W WO 2013011564 A1 WO2013011564 A1 WO 2013011564A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- airbag
- vehicle
- wall portion
- bottom wall
- inflator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
- B60R21/205—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components in dashboards
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/23—Inflatable members
- B60R21/237—Inflatable members characterised by the way they are folded
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
- B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
- B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
- B60R2021/2648—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder comprising a plurality of combustion chambers or sub-chambers
Definitions
- the present invention relates to an airbag device for a passenger seat.
- an airbag device for a passenger seat which includes an airbag, an inflator that supplies gas to the airbag, and a case that accommodates the airbag and the inflator, is provided at the upper portion of the front portion of the passenger seat of the instrument panel.
- the case includes a rear housing portion that houses the lower inflation portion of the airbag, and a front housing portion that houses the general portion and the inflator excluding the lower inflation portion of the airbag.
- the airbag device for the passenger seat described above is formed in an intermediate portion in the vertical direction that is curved so as to protrude upward and rearward of the vehicle between the upper part and the lower part of the front part of the passenger seat of the instrument panel. It is difficult to provide the space. This is especially true for thin instrument panels that are downsized in the vehicle vertical direction. Therefore, in order to enable the passenger seat airbag device to be mounted on the middle portion of the instrument panel in the vertical direction, it is necessary to downsize the passenger seat airbag device in the vehicle vertical direction.
- the present invention has been made in view of the above-described problems, and an object thereof is to downsize the passenger seat airbag device in the vehicle vertical direction.
- the passenger-side airbag device is configured such that the upper side and the lower side of the front part of the passenger seat of the instrument panel are convex on the vehicle upper side and the rear side.
- An airbag door provided in the middle in the vertical direction formed in a curved manner, and provided in a folded state on the back side of the airbag door, and when the gas supply is received, the airbag door is opened to open the airbag door
- a lower inflation having a rear bottom wall facing the door side and positioned on the front side of the lower portion of the instrument panel in the airbag when inflation is complete
- the inflator is fixed to a rear housing portion that accommodates the vehicle, and a base portion in a general portion excluding the lower inflating portion of the airbag that is formed on the vehicle front side and the upper side of the rear bottom wall portion.
- a front bottom wall portion that is inclined with respect to the rear bottom wall portion so that a central axis thereof intersects with a normal line of the rear bottom wall portion on the vehicle upper side than the airbag door, and the rear A box-like case that opens to the airbag door side is configured with the side accommodating portion, and includes a general portion of the airbag and a front accommodating portion that accommodates the inflator.
- the inflator is fixed to the front bottom wall portion formed on the vehicle front side and the upper side of the rear bottom wall portion, so that the inflator is located on the vehicle front side with respect to the central axis of the case. It is offset.
- the front bottom wall portion is inclined with respect to the rear bottom wall portion so that the center axis of the inflator intersects the normal line of the rear bottom wall portion on the vehicle upper side with respect to the airbag door. Tilted. Therefore, for example, as compared with the case where the front bottom wall portion is parallel to the direction in which the rear bottom wall portion extends, the passenger seat airbag device can be downsized in the vehicle vertical direction.
- the passenger seat airbag device is the passenger seat airbag device according to the first aspect of the present invention, wherein a plurality of gasses for injecting gas to be supplied to the airbag are injected into the inflator.
- Gas injection holes are formed side by side in the circumferential direction, and a circumferential wall that extends from the front bottom wall portion toward the airbag door side with the direction along the central axis of the inflator as a height direction and surrounds the periphery of the inflator
- a front portion of the peripheral wall portion is set to a height that covers a gas injection hole located on the vehicle front side of the plurality of gas injection holes, and a rear portion of the peripheral wall portion is a portion of the plurality of gas injection holes.
- a retainer set to a height at which the gas injection hole located on the rear side of the vehicle is exposed is further provided.
- the gas injected from the gas injection holes excluding the gas injection holes located on the rear side of the vehicle out of the plurality of gas injection holes hits the peripheral wall of the retainer and faces the airbag door side. Change the general part of the airbag.
- the gas injection hole located in the vehicle rear side among the plurality of gas injection holes is exposed to the rear portion of the peripheral wall portion. Therefore, the gas injected from the gas injection hole located on the rear side of the vehicle passes through the vehicle upper side of the rear portion of the peripheral wall portion and inflates the lower inflating portion of the airbag.
- the lower inflation portion of the airbag is pressed against the rear wall portion of the case by the pressure of the gas ejected from the gas ejection hole located on the rear side of the vehicle.
- the center track of the airbag is deflected further toward the rear of the vehicle, so that the airbag can be inflated quickly.
- the airbag device for a passenger seat according to the third aspect of the present invention is the airbag device for a passenger seat according to the first or second aspect of the present invention, wherein the direction along the normal line of the rear bottom wall portion is high.
- the rear bottom wall portion is set to the same height as the lowermost end of the inflator, or to a height that is positioned closer to the airbag door than the lowermost end of the inflator It is said that.
- the rear bottom wall portion is set to the same height as the lowermost end of the inflator, or to a height that is positioned closer to the airbag door than the lowermost end of the inflator. Accordingly, since the protrusion of the rear bottom wall portion to the vehicle lower side can be suppressed, the passenger seat airbag device can be further downsized in the vehicle vertical direction.
- a passenger seat airbag apparatus is the passenger seat airbag apparatus according to the first aspect or the second aspect of the present invention, wherein a grab box is provided below the rear bottom wall portion of the vehicle. And the rear bottom wall portion is formed in parallel with the upper wall portion of the grab box.
- the rear bottom wall portion is formed in parallel with the upper wall portion of the grab box, so that the gap between the rear bottom wall portion and the upper wall portion of the grab box is the same. Space can be secured. Thereby, for example, this space can be effectively used for mounting other devices.
- a passenger seat airbag device is the passenger seat airbag device according to any one of the first to fourth aspects of the present invention, wherein the airbag is deployed flat.
- the left and right side portions are folded to the center side to form a bellows shape, and then the lower inflatable portion is wound in a roll shape around an axis extending in the left-right direction. Yes.
- the airbag has an axial line in which the lower inflatable portion extends in the left-right direction after the left and right side portions are folded to the center side from a flatly deployed state to form a bellows shape. It is made into a folded state by being wound in a roll shape around the center. Therefore, this airbag can be easily accommodated in the case. Further, since the lower inflatable portion is wound in a roll shape, the lower inflatable portion can be easily inflated along the lower surface of the instrument panel when the airbag is inflated and deployed.
- a passenger seat airbag apparatus is the passenger seat airbag apparatus according to any one of the first to fifth aspects of the present invention, wherein the airbag doors are arranged in the vehicle longitudinal direction. And a pair of airbag doors formed with a tear line between the open ends of each other, the tear line being on the vehicle rear side with respect to the central axis of the inflator and the rear end on the outer peripheral surface of the inflator It is set as the structure set to the vehicle front side rather than the extension line which extended the part along the center axis line of the said inflator.
- the tear line formed between the open ends of the pair of airbag doors is on the vehicle rear side with respect to the center axis of the inflator and on the outer peripheral surface of the inflator.
- the rear end portion is set on the vehicle front side with respect to an extension line extending along the central axis of the inflator. Therefore, the length from the open end portion to the hinge portion of the airbag door on the rear side of the vehicle among the pair of airbag doors can be shortened.
- the airbag door on the rear side of the vehicle is opened as the airbag is inflated, the rear side of the vehicle can be used even when the passenger in the passenger seat is close to the airbag door on the rear side of the vehicle. The impact applied to the occupant from the side airbag door can be reduced.
- the length from the open end portion to the hinge portion of the airbag door on the vehicle front side can be increased.
- the airbag door on the front side of the vehicle is slowly opened compared to the case where the lengths of the pair of airbag doors are set to be equal to each other.
- a reaction force to the side can be applied.
- a passenger seat airbag apparatus is the passenger seat airbag apparatus according to the second aspect of the present invention, wherein the inflator is more than the first combustion chamber and the first combustion chamber.
- a second combustion chamber formed on the airbag door side and set to a lower output than the first combustion chamber; and a plurality of second combustion chambers that communicate with the first combustion chamber and inject a gas to be supplied to the airbag
- One gas injection hole, a plurality of second gas injection holes for injecting gas supplied to the airbag in communication with the second combustion chamber, and a gas generating agent accommodated in the first combustion chamber are combusted
- a second igniter for burning the gas generating agent accommodated in the second combustion chamber the gas injection hole exposed to the rear portion of the peripheral wall portion Is located on the rear side of the plurality of second gas injection holes
- the control unit determines the collision speed before determining whether or not the seat belt is worn, and when the collision speed is equal to or higher than the first threshold and lower than the second threshold.
- the air bag is inflated and deployed by operating the second igniter without determining whether or not the seat belt is worn. Therefore, for example, the processing function of the control unit can be simplified as compared with the case of determining whether or not the seat belt is worn before determining the collision speed, so that the start of airbag deployment can be accelerated. .
- the second igniter is activated and the airbag is inflated and deployed at a low pressure.
- the first igniter is activated and the airbag is inflated and deployed at medium pressure.
- the first igniter and the second igniter are activated and the airbag is inflated and deployed at a high pressure. . Therefore, since the airbag is inflated and deployed at an appropriate pressure according to the collision speed and whether or not the seat belt is worn, the passenger in the passenger seat can be appropriately protected.
- the second combustion chamber set at a low output is positioned closer to the airbag door than the first combustion chamber. Therefore, for example, even if the passenger in the passenger seat is not wearing the seat belt and is close to the instrument panel, the airbag can be inflated and deployed at an early stage. Thereby, this passenger
- the airbag device for the passenger seat can be downsized in the vehicle vertical direction.
- FIG. 1 is a side cross-sectional view of a front part of a passenger compartment in a vehicle to which a passenger seat airbag device according to an embodiment of the present invention is applied. It is a principal part expanded sectional view of FIG. It is a figure explaining a mode that an airbag is expand
- FIG. 2 is an enlarged side cross-sectional view of the inflator shown in FIG. 1. It is principal part side surface sectional drawing which shows the modification of the rear side bottom wall part shown by FIG.
- FIG. 6 is a side cross-sectional view showing a modification of the setting position of the tear line shown in FIG. 2. It is a block diagram which shows the structure of the airbag apparatus for passenger seats which concerns on an application example. It is a flowchart explaining operation
- arrow UP and the arrow FR shown in each figure show the vehicle up-down direction upper side and the vehicle front-rear direction front side, respectively.
- a passenger seat airbag device 10 includes a pair of airbag doors 12, 14, a holding member 16, an airbag 18, an inflator 20, and a case. 22 and a retainer 24.
- An instrument panel 28 extending in the vehicle width direction is provided at the front of the passenger compartment of the vehicle 26 to which the passenger seat airbag device 10 is applied.
- a front portion of the passenger seat 30 is formed with a vertical intermediate portion 28C that is curved between the upper portion 28A and the lower portion 28B so as to protrude upward and rearward of the vehicle.
- the airbag doors 12 and 14 are provided in the vertical middle portion 28C.
- the passenger seat airbag device 10 is a mid-mount passenger seat airbag device in which a pair of airbag doors 12 and 14 are provided in the vertical middle portion 28C.
- the pair of airbag doors 12 and 14 are arranged in the vehicle front-rear direction, and a tear line 32 extending in the vehicle width direction is formed between the open ends 12A and 14A of each other.
- the tear line 32 is set at the intersection of a center axis L1 of the inflator 20 and a center axis L3 of the case 22 which will be described later.
- the holding member 16 is provided on the back side of the instrument panel 28, and includes a flange portion 16A, a frame portion 16B, a pair of door reinforcing portions 16C and 16D, and a pair of hinge portions 16E and 16F.
- the flange portion 16A is formed in a frame shape along the periphery of the pair of airbag doors 12 and 14, and is joined to the back surface 28D of the instrument panel 28 by welding or the like, for example.
- the frame portion 16B is formed in a frame shape along the inner side of the flange portion 16A, and protrudes from the flange portion 16A toward the vehicle front side and the vehicle lower side. Locking holes 16G and 16H penetrating in the thickness direction are formed in the front wall portion 16B1 and the rear wall portion 16B2 of the frame portion 16B.
- the pair of door reinforcement portions 16C and 16D are joined to the back surfaces 12B and 14B of the pair of airbag doors 12 and 14 by welding or the like, for example.
- the pair of door reinforcement portions 16C and 16D are connected to the front wall portion 16B1 and the rear wall portion 16B2 of the frame portion 16B via hinge portions 16E and 16F, respectively.
- the hinge portions 16E and 16F are formed so that the cross-sectional shapes cut along the vehicle vertical direction are V-shaped.
- the airbag 18 is provided in a folded state on a case 22 described later. As shown in FIG. 3, the airbag 18 is inflated and deployed on the front side of the instrument panel 28 by opening the pair of airbag doors 12 and 14 when gas is supplied from the inflator 20.
- the airbag 18 includes a lower inflating portion 18A positioned on the front side of the lower portion 28B of the instrument panel 28 when inflation is completed, and a general portion 18B excluding the lower inflating portion 18A. And is composed of.
- the general portion 18B is pressed against the vertical intermediate portion 28C (a peripheral portion of the opening formed by opening the pair of airbag doors 12 and 14) and the windshield 34. It becomes a state.
- the airbag 18 is folded flat from the flat deployed state to the center side to form a bellows shape.
- the lower inflating portion 18A is wound in a roll shape around the axis L4 extending in the left-right direction, and is in the above-described folded state (see FIG. 2). More specifically, the lower inflating portion 18A is wound clockwise when viewed from the left side.
- the base 18B1 (bottom) of the bag-shaped general portion 18B has a mounting hole 18E and a plurality of hole portions 18F around the mounting hole 18E. ing.
- the inflator 20 is provided on the back side of the pair of airbag doors 12 and 14 and has a disk shape. As shown in FIG. 5, the inflator 20 includes a cup-shaped lower case 36, an inverted cup-shaped first upper case 38, and an inverted cup-shaped second upper case 40.
- the first upper case 38 and the lower case 36 form a first combustion chamber 42.
- a first gas generating agent 44 is accommodated in the first combustion chamber 42.
- the second upper case 40 has a ceiling wall portion 40A and a peripheral wall portion 40B.
- the ceiling wall portion 40A and the peripheral wall portion 40B are connected to the ceiling wall portion 38A of the first upper case 38 to form a second combustion chamber. 46 is formed.
- the second combustion chamber 46 is formed closer to the pair of airbag doors 12 and 14 than the first combustion chamber 42 (see FIG. 2).
- a second gas generating agent 48 is accommodated in the second combustion chamber 46.
- the second combustion chamber 46 has a smaller volume than the first combustion chamber 42, and the second gas generating agent 48 accommodated in the second combustion chamber 46 contains the first combustion chamber 46. The amount is smaller than that of the first gas generating agent 44 accommodated in the chamber 42. As a result, the second combustion chamber 46 is set to a lower output than the first combustion chamber 42.
- first gas injection holes 50 are formed in the circumferential wall portion 38B of the first upper case 38 side by side in the circumferential direction, and the circumferential wall portion 40B of the second upper case 40 has a circumferential direction.
- a plurality of second gas injection holes 52 are formed side by side. The first gas injection hole 50 is in communication with the first combustion chamber 42, and the second gas injection hole 52 is in communication with the second combustion chamber 46.
- the first combustion chamber 42 is provided with a cylindrical first inner cylinder member 54.
- the first inner cylinder member 54 is formed with a plurality of heat transfer holes 56 aligned in the circumferential direction and opened to the first combustion chamber 42.
- the first inner cylinder member 54 has a first combustion chamber inside.
- a first explosive 58 for burning the first gas generating agent 44 accommodated in 42 is accommodated.
- a cylindrical second inner cylinder member 60 formed longer in the axial direction than the first inner cylinder member 54 is provided.
- the second inner cylinder member 60 is inserted from the first combustion chamber 42 to the second combustion chamber 46 through the hole 38 ⁇ / b> C formed in the ceiling wall portion 38 ⁇ / b> A of the first upper case 38.
- a plurality of heat transfer holes 62 that are arranged in the circumferential direction and open to the second combustion chamber 46 are formed in the upper portion 60 ⁇ / b> A provided in the second combustion chamber 46 of the second inner cylindrical member 60.
- a second explosive 64 for burning the second gas generating agent 48 accommodated in the second combustion chamber 46 is accommodated in the second inner cylinder member 60.
- a first igniter 66 and a second igniter 68 are accommodated in the lower part of the first inner cylinder member 54 and the lower part of the second inner cylinder member 60, respectively.
- the first igniter 66 and the second igniter 68 are configured to ignite when an operating current is supplied, and to ignite the above-described first transfer charge 58 and second transfer charge 64, respectively.
- the first combustion chamber 42 accommodates a first filter 70 formed in an annular shape along the peripheral wall portion 38 ⁇ / b> B of the first upper case 38, and the second combustion chamber 46 contains the second upper case 40.
- a second filter 72 formed in an annular shape is accommodated along the peripheral wall portion 40B.
- the case 22 is accommodated inside the frame portion 16 ⁇ / b> B formed on the holding member 16 described above.
- the case 22 has a bottom wall portion 22A and a peripheral wall portion 22B formed around the bottom wall portion 22A, and is configured in a box shape that opens to the pair of airbag doors 12 and 14 side. Yes.
- the peripheral wall portion 22B has a rectangular shape when viewed from the upper side of the vehicle, and a pair of locking pieces 22C and 22D are provided on the front wall portion 22B1 and the rear wall portion 22B2, respectively.
- the pair of locking pieces 22C and 22D are locked in the locking holes 16G and 16H, respectively.
- the bottom wall portion 22A has a rear bottom wall portion 22E facing the pair of airbag doors 12 and 14, and a front bottom wall portion 22F formed on the front side and the upper side of the rear bottom wall portion 22E. ing.
- the rear bottom wall portion 22E forms a rear housing portion 22G with the rear portion of the peripheral wall portion 22B, and the lower inflating portion 18A of the airbag 18 is housed in the rear housing portion 22G.
- the front bottom wall portion 22F forms a front housing portion 22H with the front portion of the peripheral wall portion 22B, and the general portion 18B of the airbag 18 and the inflator 20 are housed in the front housing portion 22H.
- the depth of the rear housing portion 22G along the normal L2 of the rear bottom wall portion 22E is set deeper than the depth of the front housing portion 22H along the central axis L1 of the inflator 20.
- the front bottom wall portion 22F is located with respect to the rear bottom wall portion 22E so that the central axis L1 of the inflator 20 intersects the normal line L2 of the rear bottom wall portion 22E and the airbag doors 12 and 14 on the vehicle upper side. Is inclined. That is, the rear bottom wall portion 22E and the front bottom wall portion 22F are both inclined with respect to the vehicle front-rear direction so that the front end portion is positioned closer to the pair of airbag doors 12, 14 than the rear end portion. However, the front bottom wall portion 22F has a larger inclination angle with respect to the vehicle longitudinal direction than the rear bottom wall portion 22E.
- the rear bottom wall portion 22E corresponds to the bottom wall portion 36A of the lower case 36 corresponding to the lowermost end of the inflator 20. It is set to a height that is located closer to the pair of airbag doors 12, 14 than the rear end 36A1.
- the retainer 24 has a bottom wall portion 24A and a peripheral wall portion 24B, and is formed in a container shape that opens to the pair of airbag doors 12 and 14 side.
- the bottom wall portion 24A is superimposed on the front bottom wall portion 22F from the pair of airbag doors 12 and 14 side.
- the peripheral wall portion 22B is formed around the bottom wall portion 22A, and the direction along the central axis L1 of the inflator 20 is a height direction from the front bottom wall portion 22F toward the pair of airbag doors 12, 14 side. It has been extended.
- the peripheral wall portion 22 ⁇ / b> B is formed concentrically with the outer peripheral surface of the retainer 24 and surrounds the periphery of the inflator 20.
- the front part 24B1 of the peripheral wall part 24B is set to a height that covers the gas injection hole 52A located on the vehicle front side among the plurality of second gas injection holes 52, and the rear part 24B2 of the peripheral wall part 24B is a plurality of second gas injection holes 52B.
- the height is set to expose the gas injection holes 52B located on the vehicle rear side. Note that all of the plurality of first gas injection holes 50 positioned on the front bottom wall portion 22F side of the plurality of second gas injection holes 52 are covered with the peripheral wall portion 24B.
- the bottom wall portion 24A of the retainer 24 sandwiches the base portion 18B1 of the general portion 18B with the front bottom wall portion 22F.
- a flange portion 20A provided on the inflator 20 is superimposed on the opposite side of the front bottom wall portion 22F from the pair of airbag doors 12 and 14 side.
- One end of a stud bolt 74 is fixed to the bottom wall portion 24A, and this stud bolt 74 passes through the flange portion 20A and the front bottom wall portion 22F.
- the nut 76 is screwed to the other end of the stud bolt 74, whereby the bottom wall portion 24A, the front bottom wall portion 22F, and the flange portion 20A are fastened.
- the upper part of the inflator 20 above the flange part 20A includes a hole part 22I formed in the front bottom wall part 22F and a mounting hole 18E formed in the base part 18B1 of the general part 18B (see the upper view of FIG. 4). And it is inserted in order into a hole 24C formed in the bottom wall 24A of the retainer 24, and is accommodated inside the general part 18B. Further, the stud bolt 74 described above is inserted into a plurality of holes 18F (see the upper diagram of FIG. 4) formed around the mounting hole 18E.
- the airbag 18 is inflated and deployed as follows.
- the first igniter 66 when the operating current is supplied to the first igniter 66 shown in FIG. 5, the first igniter 66 is ignited, whereby the first transfer charge 58 accommodated in the first inner cylinder member 54 is generated. It is ignited. Then, the first gas generating agent 44 accommodated in the first combustion chamber 42 is combusted to generate gas, and this gas is injected from the first gas injection hole 50 into the airbag 18 (see FIG. 2).
- the first igniter 66 is ignited, whereby the first transfer charge 58 accommodated in the first inner cylinder member 54 is generated. It is ignited. Then, the first gas generating agent 44 accommodated in the first combustion chamber 42 is combusted to generate gas, and this gas is injected from the first gas injection hole 50 into the airbag 18 (see FIG. 2).
- the second igniter 68 when the operating current is supplied to the second igniter 68, the second igniter 68 is ignited, and thereby the second transfer charge 64 accommodated in the second inner cylinder member 60 is ignited. Then, the second gas generating agent 48 accommodated in the second combustion chamber 46 is burned to generate gas, and this gas is injected into the airbag 18 from the second gas injection hole 52.
- the first igniter 66 and the second igniter 68 can be ignited with a time difference or ignited simultaneously.
- the second combustion chamber 46 is set to have a lower output than the first combustion chamber 42. Accordingly, when the second gas generating agent 48 is combusted in the second combustion chamber 46 and gas is injected from the second gas injection hole 52, the airbag 18 is inflated at a low pressure.
- the airbag 18 when the first gas generating agent 44 is combusted in the first combustion chamber 42 and gas is injected from the first gas injection hole 50, the airbag 18 is inflated and deployed at an intermediate pressure, and the first combustion chamber 42 and the first combustion chamber 42 When the first gas generating agent 44 and the second gas generating agent 48 are burned in the two combustion chambers 46, respectively, and the gas is injected from the first gas injection hole 50 and the second gas injection hole 52, respectively, the airbag 18 has a high pressure. Is inflated.
- the plurality of first gas injection holes 50 shown in FIG. 2 and the gas injection holes excluding the gas injection holes 52B located on the vehicle rear side among the plurality of second gas injection holes 52 are peripheral wall portions of the retainer 24. 24B. Therefore, the gas injected from these gas injection holes strikes the peripheral wall portion 24B of the retainer 24 and turns to the pair of airbag doors 12 and 14 to inflate the general portion 18B of the airbag 18.
- the gas injection hole 52B located on the vehicle rear side among the plurality of second gas injection holes 52 is exposed to the peripheral wall portion 24B of the retainer 24. Accordingly, the gas injected from the gas injection hole 52B located on the rear side of the vehicle passes through the vehicle upper side of the rear portion 24B2 of the peripheral wall portion 24B and inflates the lower inflating portion 18A of the airbag 18. At this time, the lower inflating portion 18A of the airbag 18 is pressed against the rear wall portion 22B2 of the peripheral wall portion 22B formed in the case 22 by the pressure of the gas injected from the gas injection hole 52B located on the vehicle rear side, As a result, as shown in FIG. 3, the center track 18G of the airbag 18 is deflected further toward the rear of the vehicle.
- the general portion 18B is pressed against the vertical intermediate portion 28C and the windshield 34, and the lower inflatable portion 18A is positioned on the front side of the lower portion 28B of the instrument panel 28. Is done.
- the inflator 20 is fixed to the front bottom wall portion 22F formed on the vehicle front side and the upper side of the rear bottom wall portion 22E.
- the inflator 20 is offset toward the vehicle front side with respect to the central axis L3 of the case 22.
- the front bottom wall portion 22F is inclined with respect to the rear bottom wall portion 22E so that the central axis L1 of the inflator 20 intersects the normal line L2 of the rear bottom wall portion 22E and the airbag doors 12 and 14 on the vehicle upper side. As a result, the inflator 20 is tilted.
- the passenger-side airbag device 10 can be downsized in the vehicle vertical direction.
- the rear bottom wall portion 22E is set to a height that is located on the pair of airbag doors 12 and 14 side from the rear end portion 36A1 of the bottom wall portion 36A of the lower case 36 corresponding to the lowermost end of the inflator 20. Has been. Therefore, since the protrusion of the rear bottom wall portion 22E to the vehicle lower side can be suppressed, the passenger seat airbag device 10 can be further downsized in the vehicle vertical direction. As a result, the passenger seat airbag device 10 can be applied to a thin instrument panel that is downsized in the vehicle vertical direction.
- the lower inflation portion 18A of the airbag 18 is pressed against the rear wall portion 22B2 of the case 22 by the pressure of the gas ejected from the gas ejection hole 52B located on the rear side of the vehicle. It is done. As a result, as shown in FIG. 3, the center track 18G of the airbag 18 is deflected more toward the vehicle rear side, so that the airbag 18 can be inflated early.
- the airbag 18 has a left and right side portions 18C and 18D folded from the flat side into a bellows shape, and then the lower inflating portion 18A is left and right. It is made into the folding state by being wound in roll shape centering on the axis line L4 extended in a direction. Therefore, the airbag 18 can be easily accommodated in the case 22 (see FIG. 2). Since the lower inflating portion 18A is wound in a roll shape, as shown in FIG. 3, when the airbag 18 is inflated and deployed, the lower inflating portion 18A is moved along the surface of the lower portion 28B of the instrument panel 28. Can be inflated easily.
- the rear bottom wall portion 22 ⁇ / b> E is located at a height that is positioned closer to the pair of airbag doors 12 and 14 than the rear end portion 36 ⁇ / b> A ⁇ b> 1 of the bottom wall portion 36 ⁇ / b> A of the lower case 36. It was set. However, when the direction along the normal L2 of the rear bottom wall portion 22E is the height direction, the rear bottom wall portion 22E has the same height as the rear end portion 36A1 of the bottom wall portion 36A of the lower case 36. It may be set.
- the protrusion of the rear bottom wall portion 22E to the vehicle lower side can be suppressed, so that the passenger seat airbag device 10 can be further downsized in the vehicle vertical direction.
- the rear bottom wall portion 22E has an upper wall of the grab box 78 provided on the vehicle lower side of the rear bottom wall portion 22E, as shown in FIG. It may be formed in parallel with the portion 78A.
- the rear bottom wall portion 22E and the upper wall portion 78A extend along the vehicle horizontal direction.
- the tear line 32 is set at the intersection of the center axis L ⁇ b> 1 of the inflator 20 and the center axis L ⁇ b> 3 of the case 22.
- the tear line 32 is located on the vehicle rear side of the center axis L1 of the inflator 20 and on the rear end portion of the outer peripheral surface of the inflator 20 (in this case, the peripheral wall of the first upper case 38).
- the rear end portion 38B1) of the portion 38B may be set on the front side of the vehicle with respect to the extension line L6 extending along the central axis L1 of the inflator 20.
- the length from the open end portion 14A to the hinge portion 14C of the airbag door 14 on the vehicle rear side of the pair of airbag doors 12 and 14 can be shortened.
- the airbag door 14 on the rear side of the vehicle is opened as the airbag 18 is inflated, even if the passenger in the passenger seat is close to the airbag door 14 on the rear side of the vehicle, The impact applied to the passenger from the airbag door 14 on the rear side of the vehicle can be reduced.
- the length from the open end 12A to the hinge 12C of the airbag door 12 on the vehicle front side of the pair of airbag doors 12 and 14 can be increased.
- the airbag door 12 on the front side of the vehicle is slowly opened compared to the case where the lengths of the pair of airbag doors 12 and 14 in the vehicle front-rear direction are set equal (in the case of FIG. 2).
- a reaction force to the rear side of the vehicle can be applied to the airbag 18 by the airbag door 12 on the front side of the vehicle.
- the passenger seat airbag device 10 includes a control unit 80.
- the control unit 80 is configured by an electronic circuit having an arithmetic processing device, a storage device, and the like.
- the storage device of the control unit 80 stores a program for inflating and deploying the airbag 18 in advance. The contents of this program will be described in detail later together with the operation of the passenger airbag device 10.
- a deceleration sensor 82 and a seat belt switch 84 are connected to the control unit 80.
- the deceleration sensor 82 is provided on the vehicle body and is configured to output a signal corresponding to the deceleration of the vehicle to the control unit 80. Although a single deceleration sensor 82 is shown in FIG. 8, normally a plurality of deceleration sensors 82 are provided on the vehicle body.
- the passenger seat 30 is equipped with a seat belt 86.
- the seat belt 86 is provided with a tongue 88, and the vehicle body is provided with a buckle 90 that can be engaged with the tongue 88.
- the seat belt switch 84 shown in FIG. 8 is built in the above-described buckle 90 and outputs a signal corresponding to the engagement state and the disengagement state of the tongue 88 and the buckle 90 to the control unit 80. It is said that.
- the passenger seat airbag device 10 operates as follows.
- the control unit 80 shown in FIG. 8 detects the signal output from the deceleration sensor 82 according to the deceleration of the vehicle at regular intervals.
- the control unit 80 determines that the collision speed is greater than or equal to a predetermined first threshold based on the signal output from the deceleration sensor 82 due to the frontal collision of the vehicle, the storage device A program for inflating and deploying the airbag 18 stored in (1) is executed, and each step shown in FIG. 9 is executed.
- the control unit 80 determines that the collision speed V during a frontal collision of the vehicle is greater than or equal to the first threshold v1 and less than the second threshold v2 based on the signal output from the deceleration sensor 82 described above. Or whether the collision speed V is equal to or higher than the second threshold value v2.
- the first threshold value v1 is set to 16 mph
- the second threshold value v2 is set to 20 mph.
- step ST1 When the control unit 80 determines in step ST1 shown in FIG. 9 that the collision speed V when the above-mentioned vehicle collides in front is less than or equal to the first threshold value v1 and less than the second threshold value v2, step ST2 The operation current is output to the second igniter 68 shown in FIG.
- the second igniter 68 is activated when an operating current is input, and ignites the second explosive charge 64 filled in the second inner cylinder member 60. Thereby, the second gas generating agent 48 stored in the second combustion chamber 46 is ignited. The gas generated when the second gas generating agent 48 is ignited is supplied to the inside of the airbag 18 through the second gas injection holes 52, whereby the airbag 18 is inflated and deployed at a low pressure. Then, the control unit 80 ends the series of steps.
- step ST1 the control unit 80 determines in step ST1 shown in FIG. 9 that the collision speed V is equal to or higher than the second threshold value v2
- the control unit 80 proceeds to step ST3.
- the control unit 80 determines whether the tongue 88 and the buckle 90 shown in FIG. It is determined whether or not the occupant of the seat 30 is wearing the seat belt 86.
- step ST3 When the control unit 80 determines in step ST3 shown in FIG. 9 that the passenger in the passenger seat 30 is wearing the seat belt 86, the control unit 80 proceeds to step ST4 and performs the first operation shown in FIG. An operating current is output to the igniter 66.
- the first igniter 66 operates when an operating current is input, and ignites the first transfer charge 58 filled in the first inner cylinder member 54. As a result, the first gas generating agent 44 stored in the first combustion chamber 42 is ignited. Further, the gas generated when the first gas generating agent 44 is ignited is supplied into the airbag 18 through the first gas injection holes 50, whereby the airbag 18 is inflated and deployed at an intermediate pressure. Then, the control unit 80 ends the series of steps.
- step ST3 if the control unit 80 determines in step ST3 shown in FIG. 9 that the passenger in the passenger seat 30 is not wearing the seat belt 86, the control unit 80 proceeds to step ST5 and is shown in FIG. An operating current is output to the first igniter 66 and the second igniter 68. As a result, gas is generated from the first combustion chamber 42 and the second combustion chamber 46, and the airbag 18 is inflated and deployed at a high pressure. Then, the control unit 80 ends the series of steps.
- control unit 80 For the sake of easy understanding, the above-described various determinations performed by the control unit 80 are conceptually described. However, in reality, information processing corresponding to the conceptually described determination is performed by the control unit. At 80.
- the control unit 80 determines the collision speed before determining whether or not the seat belt 86 is worn, and the collision speed V is equal to or higher than the first threshold value v1. If it is less than the threshold value v2, the air bag 18 is inflated and deployed by operating the second igniter 68 without determining whether or not the seat belt 86 is worn. Therefore, for example, the program of the control unit 80 can be simplified as compared with the case where the presence / absence of the seat belt 86 is determined before determining the collision speed, so that the start of deployment of the airbag 18 can be accelerated. Can do.
- the second igniter 68 is activated and the airbag 18 is inflated and deployed at a low pressure.
- the first igniter 66 is activated and the airbag 18 is inflated and deployed at medium pressure. Is done.
- the first igniter 66 and the second igniter 68 are activated and the airbag 18 is operated. Is expanded at a high pressure. Therefore, since the airbag 18 is inflated and deployed at an appropriate pressure according to the collision speed and whether or not the seat belt 86 is worn, the passenger in the passenger seat 30 can be appropriately protected.
- the second combustion chamber 46 set to a low output is positioned on the side of the pair of airbag doors 12 and 14 relative to the first combustion chamber 42. Therefore, for example, even when the passenger P in the passenger seat 30 is in the vicinity of the instrument panel 28 without wearing the seat belt 86, the airbag 18 can be inflated and deployed at an early stage. Thereby, this passenger
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Abstract
Description
10 助手席用エアバッグ装置
12,14 エアバッグドア
12A,14A 開放端部
18 エアバッグ
18A 下部膨張部
18B 一般部
18B1 基部
18C,18D 側部
20 インフレータ
22 ケース
22E 後側底壁部
22F 前側底壁部
22G 後側収容部
22H 前側収容部
24 リテーナ
24B 周壁部
24B1 前部
24B2 後部
28 インストルメントパネル
28A 上部
28B 下部
28C 上下方向中間部
30 助手席
32 ティアライン
36 下側ケース
38 第一上側ケース
38B 周壁部
38B1 後端部(インフレータの外周面における後端部)
40 第二上側ケース
42 第一燃焼室
44 第一ガス発生剤
46 第二燃焼室
48 第二ガス発生剤
50 第一ガス噴射孔
52 第二ガス噴射孔
52A 車両前側に位置するガス噴射孔
52B 車両後側に位置するガス噴射孔
66 第一点火器
68 第二点火器
78 グラブボックス
78A 上壁部
80 制御ユニット
82 減速度センサ
84 シートベルトスイッチ
L1 インフレータの中心軸線
L2 後側底壁部の法線
L3 ケースの中心軸線
L4 エアバッグの左右方向に延びる軸線
L6 延長線
P 乗員
Claims (7)
- インストルメントパネルの助手席前方部位における上部と下部との間に車両上側且つ後側に凸を成すように湾曲して形成された上下方向中間部に設けられたエアバッグドアと、
前記エアバッグドアの裏側に折り畳み状態で設けられ、ガスの供給を受けた場合に前記エアバッグドアを開放して前記インストルメントパネルの表側に膨張展開されるエアバッグと、
前記エアバッグドアの裏側に設けられ、前記エアバッグにガスを供給する円盤型のインフレータと、
前記エアバッグドアの裏側に設けられ前記エアバッグドア側を向く後側底壁部を有すると共に、膨張完了時の前記エアバッグにおける前記インストルメントパネルの下部の表側に位置される下部膨張部を収容する後側収容部と、
前記後側底壁部の車両前側且つ上側に形成されて前記インフレータと前記エアバッグにおける前記下部膨張部を除いた一般部における基部とが固定されると共に前記インフレータの中心軸線が前記後側底壁部の法線と前記エアバッグドアよりも車両上側において交わるように前記後側底壁部に対して傾斜された前側底壁部を有し、且つ、前記後側収容部とで前記エアバッグドア側に開口する箱状のケースを構成して、前記エアバッグの一般部及び前記インフレータを収容する前側収容部と、
を備えた助手席用エアバッグ装置。 - 前記インフレータには、前記エアバッグに供給するガスを噴射するための複数のガス噴射孔が周方向に並んで形成され、
前記インフレータの中心軸線に沿う方向を高さ方向として前記前側底壁部から前記エアバッグドア側に向けて延出されて前記インフレータの周囲を囲う周壁部を有すると共に、前記周壁部の前部が前記複数のガス噴射孔のうち車両前側に位置するガス噴射孔を覆う高さに設定され、前記周壁部の後部が前記複数のガス噴射孔のうち車両後側に位置するガス噴射孔を露出させる高さに設定されたリテーナを備えた、
請求項1に記載の助手席用エアバッグ装置。 - 前記後側底壁部の法線に沿う方向を高さ方向とした場合に、前記後側底壁部は、前記インフレータの最下端と同一の高さ、又は、前記インフレータの最下端よりも前記エアバッグドア側に位置する高さに設定されている、
請求項1又は請求項2に記載の助手席用エアバッグ装置。 - 前記後側底壁部の車両下側には、グラブボックスが設けられ、
前記後側底壁部は、前記グラブボックスの上壁部と平行に形成されている、
請求項1又は請求項2に記載の助手席用エアバッグ装置。 - 前記エアバッグは、平らに展開された状態から左右の側部がそれぞれ中央側に折り畳まれて蛇腹状とされた後、前記下部膨張部が左右方向に延びる軸線を中心にロール状に巻かれることで前記折り畳み状態とされている、
請求項1~請求項4のいずれか一項に記載の助手席用エアバッグ装置。 - 前記エアバッグドアは、車両前後方向に並ぶと共に互いの開放端部の間にティアラインが形成された一対のエアバッグドアとされ、
前記ティアラインは、前記インフレータの中心軸線よりも車両後側で、且つ、前記インフレータの外周面における後端部を前記インフレータの中心軸線に沿って延長した延長線よりも車両前側に設定されている、
請求項1~請求項5のいずれか一項に記載の助手席用エアバッグ装置。 - 前記インフレータは、第一燃焼室と、前記第一燃焼室よりも前記エアバッグドア側に形成され、前記第一燃焼室よりも低出力に設定された第二燃焼室と、前記第一燃焼室と連通し前記エアバッグに供給するガスを噴射するための複数の第一ガス噴射孔と、前記第二燃焼室と連通し前記エアバッグに供給するガスを噴射するための複数の第二ガス噴射孔と、前記第一燃焼室に収容されたガス発生剤を燃焼させるための第一点火器と、前記第二燃焼室に収容されたガス発生剤を燃焼させるための第二点火器と、を有し、
前記周壁部の後部に対して露出されているガス噴射孔は、前記複数の第二ガス噴射孔のうち車両後側に位置するガス噴射孔とされ、
車両の前面衝突時に、車両の減速度に応じて減速度センサから出力された信号に基づいて衝突速度が第一閾値以上第二閾値未満であると判断した場合には、前記第二点火器を作動させて前記エアバッグを膨張展開させ、前記減速度センサから出力された信号に基づいて衝突速度が前記第二閾値以上であると判断した場合であって、助手席の乗員によるシートベルトの着用の有無に応じてシートベルトスイッチから出力された信号に基づいて前記助手席の乗員がシートベルトを着用していると判断したときには、前記第一点火器を作動させて前記エアバッグを膨張展開させ、前記減速度センサから出力された信号に基づいて衝突速度が前記第二閾値以上であると判断した場合であって、前記シートベルトスイッチから出力された信号に基づいて前記助手席の乗員がシートベルトを着用していないと判断したときには、前記第一点火器及び前記第二点火器を作動させて前記エアバッグを膨張展開させる制御ユニットを備えた、
請求項2に記載の助手席用エアバッグ装置。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201180036727.XA CN103038103B (zh) | 2011-07-19 | 2011-07-19 | 副驾驶席用安全气囊装置 |
| JP2012516256A JP5327383B2 (ja) | 2011-07-19 | 2011-07-19 | 助手席用エアバッグ装置 |
| US13/809,461 US8820778B2 (en) | 2011-07-19 | 2011-07-19 | Airbag device for front passenger's seat |
| EP11869511.3A EP2735480B1 (en) | 2011-07-19 | 2011-07-19 | Airbag device for front passenger seat |
| PCT/JP2011/066376 WO2013011564A1 (ja) | 2011-07-19 | 2011-07-19 | 助手席用エアバッグ装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2011/066376 WO2013011564A1 (ja) | 2011-07-19 | 2011-07-19 | 助手席用エアバッグ装置 |
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| Publication Number | Publication Date |
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| WO2013011564A1 true WO2013011564A1 (ja) | 2013-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2011/066376 Ceased WO2013011564A1 (ja) | 2011-07-19 | 2011-07-19 | 助手席用エアバッグ装置 |
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| Country | Link |
|---|---|
| US (1) | US8820778B2 (ja) |
| EP (1) | EP2735480B1 (ja) |
| JP (1) | JP5327383B2 (ja) |
| CN (1) | CN103038103B (ja) |
| WO (1) | WO2013011564A1 (ja) |
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| JP2014213749A (ja) * | 2013-04-25 | 2014-11-17 | 日本プラスト株式会社 | エアバッグ |
| JP2014218188A (ja) * | 2013-05-09 | 2014-11-20 | 豊田合成株式会社 | 自動車用エアバッグドア |
| DE102013213791A1 (de) | 2013-07-15 | 2015-01-15 | Volkswagen Aktiengesellschaft | Instrumententafel für ein Fahrzeug |
| KR101647445B1 (ko) | 2014-11-27 | 2016-08-11 | 아우토리브 디벨롭먼트 아베 | 차량용 에어백 |
| US10040414B1 (en) * | 2017-03-15 | 2018-08-07 | Nio Usa, Inc. | Dash panel exterior mounted passenger airbag |
| US10343643B2 (en) | 2017-03-29 | 2019-07-09 | Nio Nextev Limited | Airbag deployment trajectory control mechanism and method |
| US10507783B2 (en) | 2017-09-13 | 2019-12-17 | Nio Usa, Inc. | Adaptive backup structure for airbag support |
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- 2011-07-19 US US13/809,461 patent/US8820778B2/en active Active
- 2011-07-19 CN CN201180036727.XA patent/CN103038103B/zh not_active Expired - Fee Related
- 2011-07-19 WO PCT/JP2011/066376 patent/WO2013011564A1/ja not_active Ceased
- 2011-07-19 EP EP11869511.3A patent/EP2735480B1/en not_active Not-in-force
- 2011-07-19 JP JP2012516256A patent/JP5327383B2/ja not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2735480A4 (en) | 2014-07-30 |
| EP2735480A1 (en) | 2014-05-28 |
| US8820778B2 (en) | 2014-09-02 |
| CN103038103A (zh) | 2013-04-10 |
| JPWO2013011564A1 (ja) | 2015-02-23 |
| CN103038103B (zh) | 2014-01-08 |
| US20140210189A1 (en) | 2014-07-31 |
| JP5327383B2 (ja) | 2013-10-30 |
| EP2735480B1 (en) | 2015-03-25 |
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