EP2662557B1 - Boulon d'obturation avec une soupape de limitation de débit pour un injecteur - Google Patents

Boulon d'obturation avec une soupape de limitation de débit pour un injecteur Download PDF

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Publication number
EP2662557B1
EP2662557B1 EP13164996.4A EP13164996A EP2662557B1 EP 2662557 B1 EP2662557 B1 EP 2662557B1 EP 13164996 A EP13164996 A EP 13164996A EP 2662557 B1 EP2662557 B1 EP 2662557B1
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EP
European Patent Office
Prior art keywords
pressure
injector
insert
bolt
closure
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.)
Active
Application number
EP13164996.4A
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German (de)
English (en)
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EP2662557A1 (fr
Inventor
Sven Pasedach
Christian Graspeuntner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2662557A1 publication Critical patent/EP2662557A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0054—Check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/18—Fuel-injection apparatus having means for maintaining safety not otherwise provided for

Definitions

  • the invention relates to a closure pin for an injector of a modular common rail fuel injection system.
  • Modular common rail systems are characterized by the fact that part of the storage volume present in the system is present in the injector itself.
  • Modular common-rail systems are used in particularly large engines, in which the individual injectors may be mounted at a considerable distance from each other.
  • the sole use of a common rail for all injectors is not useful in such engines, as it would come to a massive slump in injection pressure due to the long lines during injection, so with prolonged injection duration, the injection rate would noticeably break.
  • it is therefore intended to arrange a high-pressure accumulator inside each injector.
  • Such a design is referred to as a modular structure, since each injector has its own high-pressure accumulator and thus can be used as a stand-alone module.
  • a high-pressure accumulator Under a high-pressure accumulator this is not a common line to understand, but it is a pressure-resistant vessel with an inlet and outlet, whose diameter is significantly increased compared to the high pressure lines, so that from the high-pressure accumulator a certain amount of injection can be delivered without causing an immediate pressure drop.
  • High pressure fuel from a high pressure pump is supplied, the supply is usually via an opening of the injector at the top of the high pressure accumulator (so-called Top feed).
  • the connection of the high-pressure fuel leading high-pressure line to the injector takes place via a provided with a high-pressure port closure pin, which can be inserted into the opening of the injector section having a preferably conical sealing surface for high pressure-tight sealing of the opening. This seals the volume of the high-pressure accumulator.
  • the closure bolt usually has the further function of passing the fuel for the adjacent injectors, for which purpose a second high-pressure port is provided.
  • a flow limiter is integrated in the locking pin, which separates the injector from the high-pressure fuel flow when the flow rate is too high.
  • the closure pin in the embodiment according to the prior art has a high-pressure bore continuous in the axial direction into which the high-pressure connection opens radially and via which the high-pressure fuel is conducted into the high-pressure accumulator.
  • the axial high-pressure bore is sealed by means of a screw plug.
  • a disadvantage of the described design of the locking bolt is that its inner contour geometrie employment is acted upon over the entire length of the full pressure of the high-pressure fuel, so that in terms of geometric design and the roughness high quality is required, which is difficult to achieve in the production.
  • the difficult to manufacture geometries for the flow restrictor are a problem. This means that a durable design at system pressures of over 1600 bar is no longer possible.
  • EP1653076B describes another flow restrictor integrated in a closure pin.
  • the present invention therefore aims to avoid the disadvantages described above. Furthermore, the invention has the object to provide a construction which is easier to manufacture and with which it is possible to adapt the closing amount of the flow restrictor in a simple manner to the respective needs.
  • the closure bolt of the type mentioned comprising at least one high-pressure connection for high-pressure fuel, a bolt-like, insertable into an opening of the injector portion with a first, preferably tapered sealing surface for high-pressure sealing the opening, wherein the bolt-like portion with the high pressure port in hydraulic connection, opening into the injector high-pressure bore, and a flow restrictor for limiting the amount of fuel delivered to the injector, according to the invention essentially designed such that the bolt-like portion has an insert in which the flow restrictor is formed and which carries the first sealing surface ,
  • the bolt-like portion of the locking bolt is thus formed at least in two parts, wherein the insert faces the high pressure accumulator and ensures the sealing of the high pressure accumulator with the first sealing surface.
  • the flow restrictor is now arranged in this insert, the difficult to manufacture geometries of the flow restrictor are limited to the use, so that the main body of the locking bolt is much easier to manufacture.
  • the high pressure applied geometries of the body can be performed without manufacturing difficulties with the appropriate radii and surfaces.
  • the two-part design means that the high-pressure bore of the locking bolt no longer has to extend through the entire locking pin, so that the use of a locking screw can be dispensed with, whereby the risk of manipulation by unauthorized persons is reduced.
  • the insert can be exchanged in a simple manner with a constant basic body, so that a simple adaptation of the closing amount of the flow restrictor succeeds by providing a plurality of inserts with a different design of the flow restrictor.
  • the insert does not have to have its own connection means to be connected to the base body. Rather, a preferred embodiment provides that the screwing of the base body with the injector body simultaneously provides the required holding force for use.
  • the formation is preferably made for this purpose such that the insert has a shoulder with a second, preferably conical sealing surface, which cooperates with a counter surface of the bolt-like portion.
  • the screwing of the locking bolt then brings the required sealing force on both sealing surfaces at the same time, namely on the first, between the injector body and the insert reaching the effective sealing surface and on the second, between the insert and the main body of the locking bolt or the bolt-like portion to effect reaching sealing surface.
  • the first and / or the second sealing surface is conical or conical.
  • the flow restrictor may particularly preferably be arranged at least partially, as a result of which high fatigue strength can be achieved.
  • the axial portion of the insert is received in the receiving bore, that it can be acted upon from the outside and from the inside with the pressure of the high-pressure fuel.
  • a pressure balanced area is created, which is subjected to pressure oscillations to a much lesser extent.
  • the pressure surges acting on the flow restrictor are minimized.
  • the difficult to manufacture flow restrictor geometries can be readily implemented without compromising fatigue strength.
  • the insert is designed so that a gap remains between its end face and the bottom of the receiving bore, so that the insert in the pressure-compensated region can be acted upon from the outside by high-pressure fuel.
  • a preferred development further provides that the receiving bore at the transition into the high pressure bore has an annular bearing surface for the closing member, in particular the ball of the flow restrictor.
  • the high-pressure bore via a throttle formed in the insert opens into the injector.
  • a rod filter is preferably arranged which retains coarse particles from the fuel.
  • Fig. 1 an embodiment of the locking bolt according to the prior art
  • Fig. 2 an embodiment according to the present invention.
  • FIG. 1 an end portion of an injector body 1 is shown, in which a high-pressure accumulator 2 is integrated.
  • the high-pressure accumulator 2 accommodating part is sometimes referred to as a holding body.
  • the injector or holding body 1 has a leading to the high-pressure accumulator 2 opening 3, in which a bolt-like portion 4 of a locking pin 5 is inserted.
  • the bolt-like portion 4 has at the high-pressure accumulator 2 facing end face on a conical sealing surface 6, which cooperates with a corresponding counter-surface at the edge of the opening 3.
  • the required holding force is applied by means of a clamping nut 7, which cooperates with its internal thread with axially adjoining external threads of the injector body 2 and the locking pin 5.
  • a gap 10 is provided between the shoulder 8 of the locking pin 5 and the annular end face 9 of the injector body 1, in order to avoid a double fit.
  • a closure bolt 5 axially passing through the high-pressure bore 11 is provided, which is closed on one side by means of a screw plug 12 and is on the other side via a throttle 13 with the high-pressure accumulator 2 in combination.
  • the closure screw 11 has a central extension 14, which supports a ball 15 of the flow restrictor 16.
  • the ball 15 is acted upon by means of a coil spring 17 in the direction of the extension 14.
  • the valve seat of the flow restrictor 16 is designated by 18.
  • the function of the flow restrictor 16 is as follows: With common rail systems, under unfavorable circumstances leaks may occur, be it in the piping system or due to defective injectors. Injectors with clamping nozzle needles, which lead to continuous injections into the combustion chamber, can cause significant damage.
  • Flow rate limiters with closing function serve to avoid these dangers, which close the inlet to the affected injector when a maximum withdrawal quantity is exceeded from the high-pressure accumulator and thus decouple the injection-pump-side high-pressure from the injection-valve side.
  • the ball 15 is pressed in the bore 11 to a stop (extension 14) and moves through the resulting during injection flow due to the pressure difference at ball flow in the direction of the sealing seat 18.
  • a stop extension 14
  • the ball 15 goes into the seat 18 and prevents further flow into the injector, whereby a continuous injection is prevented.
  • a rod filter 19 is further arranged in the high-pressure bore 11.
  • a rod filter 19 is further arranged in the high-pressure bore 11 opens a radial line, which is equipped with a high pressure port 20.
  • a line not shown is connected, via which the supply of high-pressure fuel from a high-pressure pump, not shown, takes place.
  • the closure pin 5 has a further high-pressure port 21, via which a connection to a subsequent injector can be made.
  • the high-pressure bore 11 is subjected to the pressure of the high-pressure fuel, which leads to an impermissible dynamic load at system pressures of more than 1600 bar in the region of the radii and the like required for the formation of the flow restrictor.
  • the bolt-like portion 4 of the locking bolt 5 has a receiving bore 22 into which an axial portion 23 of an insert 24 is received.
  • the insert 24 accommodates in the high pressure bore 11 the flow restrictor 16, the rod filter 19 and the throttle 13.
  • the insert 24 has a shoulder 25 on which a conical sealing surface 26 is formed, which cooperates with a conical counter surface of the bolt-like portion 4. This causes the bolting of the locking bolt 5 simultaneously generates a sealing force on the sealing surface 6 and on the sealing surface 26 by means of the clamping nut 7.
  • the end face of the axial portion 23 terminates at a distance from the provided at the transition of the receiving bore 22 in the high-pressure bore 11 annular bearing surface 28. Further, the recorded in the receiving bore 22 axial portion 23 is formed in its front portion 27 with a reduced outer diameter, so that in the Resulting annular gap between the outer periphery of the front portion 27 of the axial portion 23 and the receiving bore 22, the pressure of the high-pressure fuel from the outside on the flow restrictor 16 can be effective. This results in a pressure compensated region of the flow restrictor 16, so that the vibration load is reduced.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (11)

  1. Boulon d'obturation pour un injecteur d'un système d'injection de carburant Common Rail, comprenant
    - au moins un raccord haute pression pour du carburant sous haute pression,
    - un tronçon (4) de type boulon, insérable dans un orifice de l'injecteur, avec une surface d'étanchéité (6) de préférence conoïdale, pour l'obturation étanche à la haute pression de l'orifice, le tronçon de type boulon comportant un perçage haute pression, qui est en liaison hydraulique avec le raccord haute pression et qui débouche dans l'injecteur et
    - un limiteur de débit (16) pour limiter la quantité de carburant transportée dans l'injecteur, le limiteur de débit (16) comportant un siège de soupape pour un élément de fermeture, de sorte que dans le cas d'un débit trop important, le limiteur de débit sépare l'injecteur de l'arrivée de carburant sous haute pression,
    le tronçon (4) de type boulon comportant une pièce insérée (24) dans laquelle est conçu le limiteur de débit (16) et qui porte la première surface d'étanchéité (6).
  2. Boulon d'obturation selon la revendication 1, caractérisé en ce que la pièce insérée (24) comporte un épaulement (25) avec une deuxième surface d'étanchéité (26), de préférence conoïdale, qui interagit avec une surface antagoniste du tronçon (4) de type boulon.
  3. Boulon d'obturation selon la revendication 1 ou la revendication 2, caractérisé en ce qu'un tronçon axial (23) de la pièce insérée (24) se raccordant notamment sur l'épaulement (25) est logé dans un perçage de logement (22) du tronçon (4) de type boulon.
  4. Boulon d'obturation selon la revendication 3, caractérisé en ce que le limiteur de débit (16) est placé au moins en partie dans le tronçon axial (23) de la pièce insérée (24) logé dans le perçage de logement (22).
  5. Boulon d'obturation selon la revendication 3 ou la revendication 4, caractérisé en ce que le tronçon axial (23) de la pièce insérée (24) est logé dans le perçage de logement (22) de sorte à pouvoir être soumis par l'extérieur et par l'intérieur à la pression du carburant sous haute pression.
  6. Boulon d'obturation selon la revendication 3, la revendication 4 ou la revendication 5, caractérisé en ce que sur le passage dans le perçage haute pression (11), le perçage de logement (22) comporte une surface d'appui (28) pour l'élément de fermeture du limiteur de débit (16).
  7. Boulon d'obturation selon la revendication 6, caractérisé en ce que l'élément de fermeture est conçu sous la forme d'une bille (15).
  8. Boulon d'obturation selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le perçage haute pression (11) débouche dans l'injecteur via un restricteur (13) conçu dans la pièce insérée (24).
  9. Boulon d'obturation selon l'une quelconque des revendications 1 à 8, caractérisé en ce qu'un filtre-tige (19) est placé dans la pièce insérée (24).
  10. Injecteur d'un système d'injection modulaire Common Rail, comprenant un accumulateur haute pression (2) intégré dans le corps d'injecteur (1) qui est obturé par un boulon d'obturation (5) selon l'une quelconque des revendications 1 à 9.
  11. Injecteur selon la revendication 10, caractérisé en ce que le boulon d'obturation (5) et le corps d'injecteur (1) sont assemblés l'un à l'autre par un écrou de serrage (7).
EP13164996.4A 2012-05-08 2013-04-23 Boulon d'obturation avec une soupape de limitation de débit pour un injecteur Active EP2662557B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA548/2012A AT512162B1 (de) 2012-05-08 2012-05-08 Verschlussbolzen mit Durchflussbegrenzer

Publications (2)

Publication Number Publication Date
EP2662557A1 EP2662557A1 (fr) 2013-11-13
EP2662557B1 true EP2662557B1 (fr) 2015-10-14

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Application Number Title Priority Date Filing Date
EP13164996.4A Active EP2662557B1 (fr) 2012-05-08 2013-04-23 Boulon d'obturation avec une soupape de limitation de débit pour un injecteur

Country Status (6)

Country Link
US (1) US9279403B2 (fr)
EP (1) EP2662557B1 (fr)
JP (1) JP6366900B2 (fr)
KR (1) KR102078521B1 (fr)
CN (1) CN103388545B (fr)
AT (1) AT512162B1 (fr)

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DE102015220028A1 (de) * 2015-10-15 2017-04-20 Robert Bosch Gmbh Durchflussbegrenzer für einen Injektor
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US11346313B2 (en) * 2020-09-03 2022-05-31 Caterpillar Inc. Fuel flow limiter assembly having integral fuel filter and fuel system using same

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EP0780569A1 (fr) * 1995-12-19 1997-06-25 Nippon Soken, Inc. Dispositif d'injection de carburant avec accumulateur
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US9279403B2 (en) 2016-03-08
AT512162B1 (de) 2013-06-15
AT512162A4 (de) 2013-06-15
CN103388545B (zh) 2017-08-25
CN103388545A (zh) 2013-11-13
EP2662557A1 (fr) 2013-11-13
KR20130125323A (ko) 2013-11-18
JP6366900B2 (ja) 2018-08-01
US20130298873A1 (en) 2013-11-14
KR102078521B1 (ko) 2020-02-19
JP2013234661A (ja) 2013-11-21

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