CN107110076A - Egr装置 - Google Patents
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- CN107110076A CN107110076A CN201680004225.1A CN201680004225A CN107110076A CN 107110076 A CN107110076 A CN 107110076A CN 201680004225 A CN201680004225 A CN 201680004225A CN 107110076 A CN107110076 A CN 107110076A
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- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
- F02M26/66—Lift valves, e.g. poppet valves
- F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
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- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
- F02M26/54—Rotary actuators, e.g. step motors
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- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/55—Systems for actuating EGR valves using vacuum actuators
- F02M26/58—Constructional details of the actuator; Mounting thereof
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- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
- F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/224—Details of bearings for the axis of rotation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2261—Shaping or arrangements of the sealing the sealing being arranged on the valve member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2268—Sealing means for the axis of rotation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Lift Valve (AREA)
- Electrically Driven Valve-Operating Means (AREA)
- Details Of Valves (AREA)
Abstract
EGR装置(1)具备:壳体(2),形成有EGR流路(5);轴(7),经由轴承部(8)支撑于壳体(2);阀芯(11),与轴(7)一同转动,从而调整EGR流路(5)的开度;以及致动器(20),结合于轴(7)的一端侧,并对轴(7)进行驱动。轴承部(8)具有支撑轴(7)的一端侧的第1轴承(25)和支撑轴(7)的另一端侧的第2轴承(26)。在轴(7)的一端侧配置有防止流体向致动器(20)侧浸入的密封部件(27),并设有收容第2轴承(26)并且与外部隔绝的收容室(30)。第2轴承(26)由添加了氟树脂材料的PPS树脂材料形成。因此,第2轴承(26)即使暴露于强酸性的环境也不会被腐蚀。
Description
相关申请的交叉引用
本申请基于2015年3月31日申请的日本专利申请第2015-74282号,在此引用其全部内容。
技术领域
本公开涉及使排气气体的一部分从排气流路向吸气流路返回的EGR装置。
背景技术
已知有如下一种EGR装置,其具有使排气气体的一部分从安装于车辆的发动机的排气流路向吸气流路返回的EGR流路(以下,将返回吸气流路的排气气体称作EGR气体)。
然而,作为EGR装置,为了简化装置结构,公知有所谓的悬臂结构。这样的EGR装置具备以下详细说明的壳体、轴、阀芯、以及致动器。
在壳体的内部形成有EGR气体所流经的EGR流路。轴在一端侧经由轴承转动自如地支撑于壳体。阀芯固定于轴,并伴随着轴的转动而转动,从而对EGR流路的开度进行调整。而且,致动器结合于轴的一端侧,对轴进行转动驱动。
即,在这样的EGR装置中,成为轴仅经由一端侧的轴承支撑于壳体的结构。此外,在轴的一端侧,配置有防止流体向致动器侧浸入的密封部件。
近年来,为了进一步提高燃料消耗性能以及减少尾气排放等,产生了使大量的EGR气体向发动机回流的必要性。但是,在使大量的EGR气体流向EGR流路的情况下,存在以这样的悬臂结构不能充分保持阀芯的可能性。因此,考虑支撑轴的两端的所谓的双支撑结构的对策。但是,若采用双支撑结构,则需要在壳体设置新的轴承(参照专利文献1)。
在新设置轴承的情况下,气体或冷凝水经由新的轴承的收容空间向壳体外部流出这一隐患成为问题,但通过将新的轴承的收容空间与外部隔绝,能够防止气体及冷凝水向壳体外部流出。
但是,新的轴承由于自身暴露于强酸性的环境中,因此在新的轴承为金属制的情况下,存在腐蚀的问题。
现有技术文献
专利文献
专利文献1:日本特开2011-058536号公报
发明内容
本公开的目的在于,提供一种在将EGR装置的轴设为双支撑结构时、防止新设置的轴承腐蚀的结构。
根据本申请发明,EGR装置具备以下详细说明的壳体、轴、阀芯、以及致动器。壳体在内部形成供EGR气体流过的EGR流路。轴经由轴承部转动自如地支撑于壳体。阀芯固定于轴,伴随着轴的转动而转动,从而调整EGR流路的开度。而且,致动器结合于轴的一端侧,对轴进行转动驱动。
轴承部具有支撑轴的一端侧的第1轴承和支撑轴的另一端侧的第2轴承。另外,在轴的一端侧配置有防止流体向致动器侧浸入的密封部件,在壳体设有收容第2轴承、并且与外部隔绝的收容室。而且,第2轴承由添加了氟树脂材料的PPS树脂材料形成。
由此,第2轴承成为采用双支撑结构时新设置的轴承,该第2轴承由添加了氟树脂材料的PPS(Poly Phenylene Sulfide,聚苯硫醚)树脂材料形成。PPS树脂材料是耐热性、耐酸性非常优异的树脂材料,氟树脂材料是滑动性非常优异的树脂材料。
由此,添加了氟树脂材料的PPS树脂材料成为耐热性、耐酸性非常优异、并且滑动性也优异的树脂材料。
因此,第2轴承即使暴露于强酸性的环境也不会被腐蚀。由此,在将EGR装置的轴设为双支撑结构时,也能够防止新设置的轴承即第2轴承的腐蚀。
附图说明
图1是EGR装置的局部剖面图。
图2A是第2轴承的俯视图。
图2B是第2轴承的主视图。
图2C是第2轴承的底面。
具体实施方式
以下,基于实施例说明用于实施本公开的方式。
(实施例的结构)
使用图1说明实施例的EGR装置1的结构。
EGR装置1使EGR气体从安装于车辆的发动机的排气流路向吸气流路返回。而且,EGR装置1具备以下说明的壳体2和传感器箱3等。
壳体2为金属制例如为铝合金的压铸成型制,在内部形成有使EGR气体从发动机的排气流路向吸气流路返回的EGR流路5。
EGR流路5内成为如下空间:流通有超过200℃的EGR气体,EGR气体中的水分冷却而凝结,从而产生燃料等中所混入的氯及硫等所导致的包含盐酸或硫酸的强酸性的冷凝水。
另外,壳体2经由轴承部8将轴7支撑为转动自如,并且收容使该轴7转动的马达10。此外,轴7由耐热性优异的耐热性材料(不锈钢、耐热钢等)形成,呈圆柱状,并以其轴线为中心转动。即,固定于轴7的阀芯11也以轴7的轴线为中心转动。
阀芯11使用多个螺杆12被紧固固定于轴7,是伴随着轴7的转动而转动,从而能够对EGR流路5的开口面积即开度进行调整的圆板形状的蝶阀。此外,阀芯11以及螺杆12均由耐热性优异的耐热性材料(不锈钢、耐热钢等)形成。
此外,阀芯11通过多个齿轮的组合使马达10的旋转减速,被传递通过减速而放大的旋转转矩而转动。具体而言,利用与马达10一体地旋转的马达齿轮14、通过该马达齿轮14而转动驱动的中间齿轮15、以及通过该中间齿轮15而转动驱动的最终齿轮16的组合,使马达10的旋转减速。然后,轴7与最终齿轮16一体地转动。
马达10、以及将该马达10的旋转输出减速而使旋转转矩增大的减速机构(马达齿轮14、中间齿轮15、最终齿轮16)的组合成为致动器20,致动器20结合于轴7的一端侧,对轴7进行转动驱动。
另外,在EGR装置1中设有将阀芯11仅向闭阀方向施力的复位弹簧22。该复位弹簧22是由仅向一个方向卷绕的螺旋弹簧构成的单弹簧(Singlespring),同轴地配置于轴7的周围。
而且,复位弹簧22被组装于壳体2与最终齿轮16之间,由此产生朝向闭阀方向施力的弹簧力。即,最终齿轮16等克服复位弹簧22的弹簧力而转动。
传感器箱3为树脂制,收容检测阀芯11的旋转角的传感器24。此外,传感器24是通过检测轴7的旋转角度而检测阀芯11的开度的非接触位置传感器。而且,通过使壳体2的凸缘与传感器箱3的凸缘配合,并用螺钉紧固,从而主体2与传感器箱3成为一体。
轴承部8具有支撑轴7的一端侧的第1轴承25及支撑轴7的另一端侧的第2轴承26。第1轴承25是嵌合保持于壳体2的球轴承,具备防止气体从EGR流路5向致动器20侧浸入的作为密封部件27的氟橡胶27a。
并且,在第1轴承25与EGR流路5之间配置有油封28,该油封28具备防止冷凝水从EGR流路5向致动器20侧浸入的作为密封部件27的氟树脂27b。
由此,在轴7的一端侧配置有防止气体、冷凝水等流体向致动器20侧浸入的密封部件27。
第2轴承26是嵌合保持于壳体2的滑动轴承,由添加了氟树脂材料的PPS树脂材料形成。此外,PPS树脂材料是耐热性、耐酸性非常优异的树脂材料,通过添加氟树脂材,还确保了滑动性。
另外,若氟树脂材料相对于PPS树脂材料的比例小于35%,则滑动性不足,第2轴承26的摩耗增加,因此氟树脂材料相对于PPS树脂材料的比例优选的是35%以上。第2轴承26压入于设置在壳体2的收容室30,通过插塞32封堵收容室30,从而收容室30与外部隔绝。
第2轴承26如图2A、图2B、图2C所示那样呈圆筒形,并以与轴线方向形成角度的方式设有吸收线膨胀之差的切口(Slit)33。
此外,将切口33设为与轴线方向形成角度,是为了避免因在轴线方向上产生轴7不接触的区域而导致产生滑动时的阻力变大的区域。
另外,第2轴承26由于为树脂制,因此能够采用一般的注射成型,关于形状的设计自由度也较高。
(实施例的效果)
在本实施例中的EGR装置1中,轴承部8具有支撑轴7的一端侧的第1轴承25及支撑轴7的另一端侧的第2轴承26。另外,在轴7的一端侧配置有防止流体向致动器20侧浸入的密封部件27,在壳体2设有收容第2轴承26、并且与外部隔绝的收容室30。而且,第2轴承26由添加了氟树脂材料的PPS树脂材料形成。
由此,第2轴承26成为采用双支撑结构时新设置的轴承,由添加了氟树脂材料的PPS树脂材料形成,因此第2轴承26即使暴露于强酸性的环境也不会被腐蚀。由此,在将EGR装置1的轴7设为双支撑结构时,也能够防止新设置的轴承即第2轴承26的腐蚀。
此外,由于第2轴承为块状部件,因此不存在像涂敷剂那样因磨削或剥离而导致失去效果的情况。
另外,第2轴承26被压入设于壳体2的收容室30,并用插塞32封堵收容室30,从而收容室30与外部隔绝,因此气体或冷凝水不会向壳体2的外部流出。
此外,在第1轴承25与EGR流路5之间配置有油封28,该油封28具备防止冷凝水从EGR流路5向致动器20侧浸入的作为密封部件27的氟树脂27b。通过将氟树脂27b设为防止冷凝水从EGR流路5向致动器20侧浸入的密封部件27,相比于使用因冷凝水而溶胀从而密封性降低的橡胶制部件,能够可靠地防止冷凝水的浸入。
另外,第1轴承25是嵌合保持于壳体2的球轴承,并具备防止气体从EGR流路5向致动器20侧浸入的作为密封部件27的氟橡胶27a。通过将氟树脂27a设为密封部件27,能够可靠地防止通过氟树脂27b去除了冷凝水后的气体向致动器20侧浸入。
由此,在本实施例中,采用了首先利用油封28去除冷凝水,之后利用球轴承的氟橡胶防止气体向致动器20侧浸入的结构。
(变形例)
本公开在不脱离其主旨的范围内,能够考虑各种变形例。
例如,根据实施例,第2轴承26为滑动轴承,但也可以将第2轴承26设为球轴承或滚针轴承那样的滚动轴承。
Claims (1)
1.一种EGR装置(1),具备:
壳体(2),在内部形成供EGR气体流过的EGR流路(5);
轴(7),经由轴承部(8)转动自如地支撑于上述壳体(2);
阀芯(11),固定在上述轴(7)上,伴随着上述轴(7)的转动而转动,从而调整上述EGR流路(5)的开度;以及
致动器(20),结合于上述轴(7)的一端侧,对上述轴(7)进行转动驱动,
上述轴承部(8)具有支撑上述轴(7)的一端侧的第1轴承(25)和支撑上述轴(7)的另一端侧的第2轴承(26),
在上述轴(7)的一端侧配置有防止流体向上述致动器(20)侧浸入的密封部件(27),
在上述壳体(2)设置有收容上述第2轴承(26)并且与外部隔绝的收容室(30),
上述第2轴承(26)由添加了氟树脂材料的PPS树脂材料形成。
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JP2015074282A JP6435969B2 (ja) | 2015-03-31 | 2015-03-31 | Egr装置 |
JP2015-074282 | 2015-03-31 | ||
PCT/JP2016/001378 WO2016157756A1 (ja) | 2015-03-31 | 2016-03-11 | Egr装置 |
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CN107110076A true CN107110076A (zh) | 2017-08-29 |
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CN201680004225.1A Pending CN107110076A (zh) | 2015-03-31 | 2016-03-11 | Egr装置 |
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US (1) | US20180003134A1 (zh) |
JP (1) | JP6435969B2 (zh) |
CN (1) | CN107110076A (zh) |
DE (1) | DE112016001522T5 (zh) |
WO (1) | WO2016157756A1 (zh) |
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JP6768427B2 (ja) * | 2016-06-01 | 2020-10-14 | 愛三工業株式会社 | 二重偏心弁 |
JP6904897B2 (ja) * | 2017-12-25 | 2021-07-21 | 愛三工業株式会社 | Egrクーラシステム |
DE102019101051A1 (de) * | 2019-01-16 | 2020-07-16 | Pierburg Gmbh | Abgasrückführventil für eine Verbrennungskraftmaschine |
JP7146149B2 (ja) * | 2020-09-23 | 2022-10-03 | 三菱電機株式会社 | バルブ装置 |
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JP2016194269A (ja) | 2016-11-17 |
WO2016157756A1 (ja) | 2016-10-06 |
DE112016001522T5 (de) | 2018-01-04 |
US20180003134A1 (en) | 2018-01-04 |
JP6435969B2 (ja) | 2018-12-12 |
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