WO2016135933A1 - 波動歯車装置 - Google Patents
波動歯車装置 Download PDFInfo
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- WO2016135933A1 WO2016135933A1 PCT/JP2015/055685 JP2015055685W WO2016135933A1 WO 2016135933 A1 WO2016135933 A1 WO 2016135933A1 JP 2015055685 W JP2015055685 W JP 2015055685W WO 2016135933 A1 WO2016135933 A1 WO 2016135933A1
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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
- F16H—GEARING
- F16H49/00—Other gearings
- F16H49/001—Wave gearings, e.g. harmonic drive transmissions
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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
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
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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
- F16H—GEARING
- F16H49/00—Other gearings
- F16H49/001—Wave gearings, e.g. harmonic drive transmissions
- F16H2049/003—Features of the flexsplines therefor
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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
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
- F16H2055/176—Ring gears with inner teeth
Definitions
- the present invention relates to a wave gear device having no meshing play.
- the flexible external gear is bent into a non-circular shape, for example, an ellipse, by the wave generator, and partially meshes with the rigid internal gear.
- the meshing of the internal gear and the external gear is in a state where the meshing PCD of both gears overlaps (meshing in an overlapped state)
- the starting torque, the tooth surface load suddenly increase, etc.
- the performance of the wave gear device is greatly reduced, and the assembly of both gears becomes difficult. Therefore, the meshing of both gears in the wave gear device is designed so that the meshing PCD of both gears is in an underlap state with a slight separation.
- Patent Document 1 proposes a speed reducer that can reduce backlash.
- the backlash is reduced by assembling the externally deformable external teeth with the preload applied and engaging the internal teeth.
- Another object of the present invention is to provide a wave gear that uses elastically deformable external teeth, and can suppress or eliminate tooth meshing play without causing sudden increase in starting torque, tooth surface load, difficulty in assembly, etc. To provide an apparatus.
- the external teeth of the flexible external gear can be elastically deformed in the direction in which the tooth thickness increases or decreases
- the engagement between the internal teeth and the external teeth is an overlap state in which the external teeth are elastically deformed and engaged in a state without a gap
- the tooth profile of the internal teeth is in the state of engagement in the overlap state.
- the tooth profile is modified so that interference does not occur between the tooth tip portion of the inner tooth and the tooth root portion of the outer tooth.
- the externally deformable external teeth mesh with the internal teeth in an overlapping state. That is, a transition tooth profile obtained by shifting the internal tooth profile or the external tooth profile in the positive direction is set, and the engagement of both teeth is set in an overlapping state.
- the deflection amount of the external gear by the wave generator to a deflection amount that is larger than the standard deflection amount where the overlap amount is zero.
- the external teeth can be elastically deformed in the direction in which the thickness of the external teeth increases or decreases, and thus the external teeth move along the tooth surfaces of the internal teeth while elastically deforming.
- the root portion connected to the root rim of the externally deformable external tooth does not substantially elastically deform in the tooth thickness direction, and may interfere with the tooth tip portion of the internal tooth. Since the tooth profile of the internal teeth is modified so that no interference occurs between these parts, a smooth meshing of both teeth can be formed.
- the meshing of the overlapping state between the internal teeth and the external teeth is formed by performing a shift on the internal tooth profile or the external tooth profile.
- the amount of bending of the external gear is increased to form an overlapped mesh, it is necessary to reduce the effective tooth height of the external tooth in order to avoid meshing interference. As a result, the load torque capacity of the wave gear device is reduced. Therefore, the engagement of the overlap state is formed by the dislocation of the external teeth or the internal teeth, so that interference does not occur between the tip portion of the internal teeth and the root portion of the external teeth at the time of the overlap state engagement. It is desirable to modify the tooth profile of the internal teeth.
- the external teeth are formed such that the amount of elastic deformation gradually decreases from the tip of the external teeth toward the base of the teeth.
- the external teeth are largely elastically deformed in the tooth thickness direction on the tooth tip side, and hardly elastically deformed on the tooth base side.
- the outer teeth are formed with slits that extend from the tooth root side to the tooth tip side and open to the tooth tip surface with the tooth center line as the center line.
- the width of the slot is preferably 15% to 40% of the tooth thickness of the external teeth.
- the maximum depth of the slit groove is a depth to the root circle of the external gear.
- the groove bottom surface of the slit groove is defined by an arcuate concave surface.
- the groove width of the slit groove can be constant from the groove bottom surface to the tooth tip surface. Instead, the groove width of the slit groove may gradually increase from the groove bottom surface toward the tooth tip surface.
- the shape of the tooth surface portion involved in the meshing in the modified tooth profile adopted as the internal tooth profile can be set as follows. That is, the tooth profile of the internal teeth that can mesh with the external teeth in the state of no overlap is a basic tooth profile, and the overlap amount when the external teeth mesh with the internal teeth is a set overlap amount, and the basic tooth profile On the other hand, the tooth profile obtained by moving the basic tooth profile by a distance of 1 ⁇ 2 of the set overlap amount along the tooth crest center line in a direction approaching the external tooth is a translation tooth profile.
- the portion of the tooth surface tooth profile curve that defines the tooth surface that is involved in the meshing in the basic tooth profile hits the end of the translation tooth profile on the tooth base side with the end of the tooth tip side of the tooth surface tooth profile curve as the center.
- a curve obtained by rotating to a position is defined as a rotating tooth surface tooth profile curve.
- An effective meshing tooth profile surface involved in meshing in the modified tooth profile is defined by the rotating tooth profile tooth profile curve.
- the present invention can be applied to a flat wave gear device having a cylindrical external gear that is not preloaded. Moreover, it is applicable also to other wave gear apparatuses, such as a cup type and a top hat type.
- FIG. 1 is a schematic cross-sectional view, a schematic vertical cross-sectional view, a partially enlarged cross-sectional view, and an explanatory view showing a meshing state of teeth of a flat type wave gear device to which the present invention is applied.
- It is explanatory drawing which shows the meshing state of the external tooth and internal tooth provided with the standard tooth profile, and explanatory drawing which shows two examples of the meshing state of the tooth of an overlap state.
- explanatory drawing which shows the displacement tooth profile of an internal tooth
- explanatory drawing which shows the method of a tooth profile correction
- explanatory drawing which shows an example of a correction tooth profile
- explanatory drawing which shows the meshing state of the tooth profile of an external tooth, and the correction tooth profile of an internal tooth
- FIG. 1A is a schematic transverse sectional view showing a flat wave gear device according to an embodiment
- FIG. 1B is a longitudinal sectional view thereof
- FIG. 1C is a partially enlarged sectional view thereof
- FIG. 1 (d) is an explanatory view showing the meshing state of teeth at the position of the elliptical long axis.
- the wave gear device 1 includes a first internal gear 2 and a second internal gear 3 as rigid internal gears.
- the first and second internal gears 2 and 3 are coaxially arranged in parallel, and a cylindrical flexible external gear 4 is arranged inside them.
- a wave generator 5 having an elliptical contour is fitted inside the external gear 4.
- the external gear 4 is bent elliptically by the wave generator 5, and the external teeth 6 are the internal teeth 7 of the first internal gear 2 and the second internal gear 3 at both end portions of the elliptical long axis L ⁇ b> 1. It meshes with both of the internal teeth 8 of the.
- the number of teeth of the first internal gear 2 is 2n more (n is a positive integer) than the number of teeth of the second internal gear 3, and the number of teeth of the external gear 4 is that of the second internal gear 3. It is the same as the number of teeth.
- the external teeth 6 mesh with the internal teeth 8 as shown in FIG.
- the external teeth 6 of the external gear 4 are formed with slits 9 and can be elastically deformed in the direction in which the tooth thickness increases or decreases. Further, the engagement between the external teeth 6 and the internal teeth 7 and 8 of the first and second internal gears 2 and 3 is set to be in an overlapping state. In FIG. 1A, the slot 9 is omitted and the external teeth 6 are shown.
- modified tooth forms 7C and 8C obtained by modifying the basic tooth form that can mesh with the tooth form 6A of the external tooth 6 are employed as the tooth forms of the internal teeth 7 and 8.
- the modified tooth profiles 7C and 8C By using the modified tooth profiles 7C and 8C, the overlap between the outer teeth 6 and the inner teeth 7 and 8 is realized, and the tip portion of the inner teeth 7 and 8 and the outer teeth at the time of the engagement are realized. Interference does not occur with the tooth base portion of 6. Below, the external tooth 6 and the one internal tooth 8 are demonstrated.
- FIGS. 2 (a) and 2 (c) are explanatory views showing the engagement of both teeth 6 and 8, respectively. .
- a dislocation tooth profile 8 ⁇ / b> B in which the basic tooth profile 8 ⁇ / b> A is displaced in the positive direction according to the overlap amount h is adopted as the tooth profile of the internal teeth 8.
- the deepest position of the engagement of the tooth profile 6 ⁇ / b> A of the external tooth 6 is a position closer to the root side of the internal tooth 8.
- a dislocation tooth profile may be used as the tooth profile of the external tooth 6 instead of the internal tooth 8.
- the tooth profile 6A of the external tooth 6 interferes with the tooth surface of the dislocation tooth profile 8B of the internal tooth 8 from the position closest to the deepest position according to the overlap amount.
- a portion surrounded by a one-dot chain line indicates the interference region 10.
- the amount of deflection of the external gear 4 by the wave generator 5 is made larger than the amount of deflection with which the standard meshing shown in FIG. Engagement can also be formed. Also in this case, interference occurs between the tooth forms 6A and 8A of both teeth 6 and 8 as in the case of FIG. As a result, problems such as a sudden increase in the starting torque of the wave gear device 1 and the difficulty in assembling both gears occur.
- the external teeth 6 are elastically deformed in the tooth thickness direction so that the tooth profile 6A of the external teeth 6 can move smoothly without gaps along the tooth profile of the internal teeth 8, for example, the tooth profile of the dislocation tooth profile 8B.
- FIG. 3 is an explanatory view showing the external teeth 6 that can be elastically deformed.
- the external teeth 6 can be elastically deformed in a direction (circumferential direction) in which the tooth thickness decreases when the teeth are engaged in an overlapped state.
- the amount of elastic deformation of the tooth tip portion 6a is large, and the structure becomes smaller as it approaches the tooth root portion 6b. Therefore, in this example, a slit 9 is formed in the external tooth 6.
- the external tooth 6 has a slit 9 extending from the tooth root side to the tooth tip side and opening to the tooth tip surface 6d with the tooth peak center line 6c as the center line when viewed from the tooth width direction. Is formed.
- the external teeth 6 are separated from the tooth base side into left and right external tooth portions 61 and 62 by the slit groove 9. These outer tooth portions 61 and 62 can be elastically deformed in a direction in which the tooth tip side portion approaches the tooth thickness direction (circumferential direction) according to the overlap amount when meshing with the inner teeth 8. Therefore, at the time of meshing with the internal teeth 8, the external tooth portions 61, 62 on the meshing side are pushed by the tooth surfaces of the internal teeth 8 and move along the tooth surfaces of the internal teeth 8 while being elastically deformed.
- the groove shape of the slot 9 is appropriately set based on the relationship between the amount of elastic deformation from the tooth root of the external tooth 6 to the tooth tip and the deformation force, the tooth surface contact force by the load torque, the spring constant, etc. Desirable shapes are desirable. If the groove width W is wider, the external teeth 6 are more easily elastically deformed. However, if the groove width W is too large, the spring constant and ratcheting torque are significantly reduced. From such a viewpoint, it is desirable that the groove width W of the slit groove 9 is 15% to 40% of the tooth thickness S of the external teeth 6.
- the groove width W exceeds 40% of the tooth thickness S, the spring constant and the ratcheting torque are significantly reduced, which is not preferable.
- the groove width W is less than 15% of the tooth thickness S, the elastic deformation force of the external teeth 6 increases, leading to an increase in starting torque and a decrease in efficiency.
- the groove width W is constant throughout, as shown by an imaginary line in FIG. 3, the groove opening 9 b opened from the groove bottom surface 9 a of the slot 9 to the tooth tip surface 6 d of the external tooth 6. It may gradually spread toward you.
- the groove depth D of the slit groove 9 is desirably up to the root circle Cdf of the external gear 4 at the maximum in order to prevent the fatigue strength of the external gear 4 from being lowered. Further, it is desirable that the groove bottom surface 9a be an arc-shaped concave surface in order to alleviate external stress concentration.
- the groove depth D of the slot 9 is the depth to the root circle Cdf of the external gear. It is also possible to make the groove depth D shallower than this.
- the bottom surface 9a of the slot 9 is defined by a semicircular concave surface.
- the tooth profile 6 ⁇ / b> A of the external teeth 6 moves along the tooth surface of the dislocation tooth profile 8 ⁇ / b> B of the internal teeth 8 without a gap when meshing in an overlapped state.
- the elastically deformable external teeth 6 are employed, in the overlapping state, as shown in FIG. 4, at the deepest engagement position of the external teeth 6 or at the front and back thereof, the root portion of the external teeth 6
- the interference that occurs between 6b and the tip 8a of the internal tooth 8 cannot be eliminated.
- the interference region 11 is surrounded by a one-dot chain line.
- the internal tooth 8 of this example uses a modified tooth profile 8C obtained by correcting the tooth profile of the dislocation tooth profile 8B as the tooth profile of the internal tooth 8 in order to eliminate such interference at the time of meshing.
- FIG. 5 (a) is an explanatory diagram showing a dislocation tooth profile 8B of the internal tooth 8
- FIG. 5 (b) is an explanatory diagram showing a method for correcting a tooth profile
- FIG. 5 (c) is an explanatory diagram showing a modified tooth profile 8C
- FIG. 5 (d) is an explanatory view showing a meshing state between the modified tooth profile 8 ⁇ / b> C and the tooth profile 6 ⁇ / b> A of the external tooth 6.
- the tooth profile 6A of the external tooth 6 and the basic tooth profile 8A of the internal tooth 8 are designed, and the design overlap amount considering the elastic deformation of the external tooth 6 is set.
- FIG. 5 (a) with respect to the basic tooth profile 8A of the inner tooth 8, in the direction of approaching the tooth profile 6A of the outer tooth 6 along the tooth center line by 1/2 of the overlap amount h.
- a parallel displacement tooth profile (dislocation tooth profile) 8B of the basic tooth profile 8A is drawn at a distant position.
- the portion of the tooth surface tooth profile curve 81 defining the tooth surface involved in the meshing in the basic tooth profile 8A is the end point a on the tooth tip side of the tooth surface tooth profile curve 81. Is rotated to a position corresponding to the end point b on the tooth base side of the translation tooth 8B.
- the rotating tooth surface tooth profile curve obtained after the rotation is smoothly extended until it intersects the tooth tip surface of the basic tooth profile 8A, and the point intersecting with the tooth tip surface is defined as an intersection point c.
- an effective meshing tooth profile surface 82 involved in meshing in the modified tooth profile 8C is defined.
- the correction tooth profile 8C of the internal tooth 8 is defined by the correction effective meshing tooth profile surface 82 thus obtained, a predetermined tooth tip surface 83, and a predetermined tooth bottom surface 84.
- interference does not occur in the overlapping state of the internal teeth 8 provided with the modified tooth profile 8C formed in this way and the external teeth 6 provided with the tooth profile 6A.
- the internal teeth 7 of the other first internal gear 2 are also defined by a modified tooth profile, like the internal teeth 8.
- the external gear 4 is engaged with the internal gears 2 and 3 in an overlapping state. Further, external teeth that can be elastically deformed in a direction in which the tooth thickness decreases are used as the external teeth 6 of the external gear 4. Further, as the internal teeth 7 and 8 of the internal gears 2 and 3, a correction tooth profile 7 ⁇ / b> C that has been corrected in consideration of the elastic deformation of the external teeth 6 due to the set overlap amount is used.
- the meshing in the overlap state is formed by applying dislocations to the tooth profile of the internal teeth.
- the meshing of the overlapped state is formed by increasing the amount of bending of the external gear by the wave generator, it is necessary to reduce the effective tooth height of the external tooth profile in order to avoid tooth meshing interference. is there. As a result, the load torque capacity of the wave gear device is reduced, which may be undesirable.
- dislocation is applied to the tooth profile to form an overlapped mesh, it is preferable because the meshing interference can be avoided without reducing the effective tooth length of the external tooth profile.
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Abstract
Description
Claims (10)
- 可撓性の外歯歯車の外歯は歯厚が増減する方向に弾性変形可能であり、
剛性の内歯歯車の内歯と前記外歯との間のかみ合いは、前記外歯が弾性変形して間隙の無い状態でかみ合うオーバーラップ状態のかみ合いであり、
前記内歯の歯形は、前記オーバーラップ状態のかみ合い時における前記内歯の歯先部分と前記外歯の歯元部分との間に干渉が生じないように修正された修正歯形である波動歯車装置。 - 前記内歯と前記外歯の間の前記オーバーラップ状態のかみ合いは、前記内歯の歯形あるいは前記外歯の歯形に転位を施すことによって形成されている請求項1に記載の波動歯車装置。
- 前記外歯は、当該外歯の歯先から歯元に向かって弾性変形量が漸減するように形成されている請求項1に記載の波動歯車装置。
- 前記外歯には、歯幅方向から見た場合に、歯山中心線を中心線として歯元側から歯先側に延びて歯先面に開口するすり割り溝が形成されている請求項3に記載の波動歯車装置。
- 前記すり割り溝の幅は、前記外歯の歯厚の15%から40%であり、
前記すり割り溝の幅は一定であるか、あるいは、当該すり割り溝の溝底面から前記歯先面に向かって徐々に広がっている請求項4に記載の波動歯車装置。 - 前記すり割り溝の最大深さは、前記外歯歯車の歯底円までの深さである請求項4に記載の波動歯車装置。
- 前記すり割り溝の前記溝底面は、円弧状の凹面によって規定されている請求項4に記載の波動歯車装置。
- オーバーラップ無しの状態で前記外歯にかみ合い可能な前記内歯の歯形を基本歯形とし、
前記外歯と前記内歯のかみ合い時のオーバーラップ量を設計オーバーラップ量とし、
前記基本歯形に対して、当該基本歯形を前記設計オーバーラップ量の1/2だけ、歯山中心線に沿って、前記外歯に接近する方向に離れた位置に移動して得られる歯形を平行移動歯形とし、
前記基本歯形におけるかみ合いに関与する歯面を規定している歯面歯形曲線の部分を、当該歯面歯形曲線における歯先側の端を中心に、前記平行移動歯形の歯元側の端に当る位置まで回転して得られる曲線を回転歯面歯形曲線とすると、
前記修正歯形におけるかみ合いに関与する有効かみ合い歯形面は、前記回転歯面歯形曲線によって規定されている請求項1に記載の波動歯車装置。 - 前記内歯と前記外歯の間の前記オーバーラップ状態のかみ合いは、前記内歯の歯形あるいは前記外歯の歯形に転位を施すことによって形成されており、
前記外歯には、歯幅方向から見た場合に、歯山中心線を中心線として歯元側から歯先側に延びて歯先面に開口するすり割り溝が形成されており、
前記すり割り溝の幅は、前記外歯の歯厚の15%から40%であり、
前記すり割り溝の最大深さは、前記外歯歯車の歯底円までの深さであり、
前記すり割り溝の溝底面は、円弧状の凹面によって規定されている請求項8に記載の波動歯車装置。 - 前記内歯歯車として、同軸に並列配置された第1内歯歯車および第2内歯歯車を有し、
前記外歯歯車は、前記第1、第2内歯歯車の内歯にそれぞれかみ合い可能な前記外歯と、前記外歯が外周面に形成されている半径方向に撓み可能な円筒とを備えている請求項1に記載の波動歯車装置。
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CN201580002471.9A CN107250606B (zh) | 2015-02-26 | 2015-02-26 | 波动齿轮装置 |
JP2016514786A JP6067184B1 (ja) | 2015-02-26 | 2015-02-26 | 波動歯車装置 |
KR1020167009757A KR101718684B1 (ko) | 2015-02-26 | 2015-02-26 | 파동기어장치 |
DE112015000174.3T DE112015000174B4 (de) | 2015-02-26 | 2015-02-26 | Verformungswellgetriebe |
PCT/JP2015/055685 WO2016135933A1 (ja) | 2015-02-26 | 2015-02-26 | 波動歯車装置 |
US15/101,179 US10066724B2 (en) | 2015-02-26 | 2015-02-26 | Strain wave gearing |
TW105102039A TWI619894B (zh) | 2015-02-26 | 2016-01-22 | 諧波齒輪裝置 |
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JP6886415B2 (ja) * | 2018-02-23 | 2021-06-16 | 住友重機械工業株式会社 | 歯車装置のシリーズ、歯車装置のシリーズの構築方法、および歯車装置群の製造方法 |
CN108730478B (zh) * | 2018-08-14 | 2021-06-15 | 台邦电机工业集团有限公司 | 谐波齿轮 |
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- 2015-02-26 CN CN201580002471.9A patent/CN107250606B/zh active Active
- 2015-02-26 US US15/101,179 patent/US10066724B2/en active Active
- 2015-02-26 WO PCT/JP2015/055685 patent/WO2016135933A1/ja active Application Filing
- 2015-02-26 DE DE112015000174.3T patent/DE112015000174B4/de active Active
- 2015-02-26 KR KR1020167009757A patent/KR101718684B1/ko active IP Right Grant
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KR20190104566A (ko) * | 2017-11-29 | 2019-09-10 | 가부시키가이샤 하모닉 드라이브 시스템즈 | 파동기어장치 |
JPWO2019106773A1 (ja) * | 2017-11-29 | 2019-12-12 | 株式会社ハーモニック・ドライブ・システムズ | 波動歯車装置 |
KR102209029B1 (ko) * | 2017-11-29 | 2021-01-27 | 가부시키가이샤 하모닉 드라이브 시스템즈 | 파동기어장치 |
TWI771509B (zh) * | 2017-11-29 | 2022-07-21 | 日商和諧驅動系統股份有限公司 | 諧波齒輪裝置 |
Also Published As
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CN107250606A (zh) | 2017-10-13 |
JPWO2016135933A1 (ja) | 2017-04-27 |
KR101718684B1 (ko) | 2017-03-22 |
TW201702497A (zh) | 2017-01-16 |
US20170002914A1 (en) | 2017-01-05 |
DE112015000174B4 (de) | 2023-06-01 |
CN107250606B (zh) | 2019-05-17 |
TWI619894B (zh) | 2018-04-01 |
JP6067184B1 (ja) | 2017-01-25 |
DE112015000174T5 (de) | 2016-10-20 |
US10066724B2 (en) | 2018-09-04 |
KR20160113574A (ko) | 2016-09-30 |
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