WO2015011820A1 - 波動歯車装置 - Google Patents
波動歯車装置 Download PDFInfo
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- WO2015011820A1 WO2015011820A1 PCT/JP2013/070245 JP2013070245W WO2015011820A1 WO 2015011820 A1 WO2015011820 A1 WO 2015011820A1 JP 2013070245 W JP2013070245 W JP 2013070245W WO 2015011820 A1 WO2015011820 A1 WO 2015011820A1
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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
Definitions
- the present invention relates to a wave gear device called a flat wave gear device having a cylindrical external gear that can be bent in a non-circular shape.
- a flat-type wave gear device includes first and second internal gears arranged in parallel, cylindrical external gears arranged inside thereof, and a wave generator arranged inside the external gears. ing.
- the first internal gear is a stationary-side internal gear that is fixed so as not to rotate, and has more teeth than the second internal gear.
- the second internal gear is a gear having the same number of teeth as the external gear, and is a drive-side internal gear that can rotate integrally with the external gear.
- the external gear is bent non-circularly by the wave generator and partially meshed with the first and second rigid internal gears.
- the meshing position between the first and second internal gears and the external gear moves in the circumferential direction.
- a relative rotation corresponding to the difference in the number of teeth occurs between the first internal gear and the external gear. Since the first internal gear is fixed so as not to rotate, the external gear rotates. The rotation of the external gear is extracted from the second internal gear that rotates integrally with the external gear and is transmitted to the load-side member.
- Patent Documents 1 and 2 describe a flat wave gear device using a ball bearing having flexible inner and outer rings as a wave generator.
- Patent Document 3 describes a flat wave gear device using a needle roller bearing having flexible inner and outer rings as a wave generator.
- Patent Document 4 describes a flat wave gear device including a wave generator including a pair of rollers.
- the conventional flat wave gear device is configured to satisfy the following conditions A1 to A4. This will be described with reference to FIG.
- Condition A1 The stationary-side first internal gear 102 and the driving-side second internal gear 103 are gears having the same tooth width.
- the wave generator 105 is arranged so as to be symmetric with respect to the orthogonal plane PL.
- the external tooth support center P2 (ball center) by the wave generator 105 coincides with the tooth width center P1 of the external gear 104.
- the present inventors satisfy the above conditions A1 to A4 in consideration of the mechanical characteristics of the first internal gear, the mechanical characteristics of the second internal gear, the operating conditions of the flat wave gear device, and the like. It has been found that the conventional configuration is not always optimal. For example, these parts are arranged so that the center position between the first and second internal gears matches the center position in the tooth width direction of the external gear and the ball center of the wave generator matches. Is not always optimal.
- an object of the present invention is to propose a flat wave gear device that is configured based on conditions different from those of the prior art.
- the wave gear device (1, 1A) of the present invention is A first internal gear (2, 2A) and a second internal gear (3, 3A) arranged in parallel in the direction of the central axis (1a);
- a wave generator (5) Have The external teeth (4a) of the external gear (4) are relative to the internal teeth (2a, 3a) (2b, 3b) of both the first and second internal gears (2, 3) (2A, 3A). The tooth width is engageable over the whole tooth width direction of these internal teeth (2a, 3a) (2b, 3b),
- the wave generator (5) includes an external tooth support surface (5a) that comes into contact with the inner peripheral surface of the external gear (4) and bends the external gear so as to be non-circular in the radial direction.
- the center position of the external tooth support surface (5a) in the direction of the central axis (1a) is called the support center (P2), and the center position of the external teeth (4a) in the tooth width direction is called the tooth width center (P1).
- the support center (P2) is on the first internal gear (2) side or the second internal gear (3) side along the direction of the central axis (1a) with respect to the tooth width center (P1). It is characterized by being set at a shifted position.
- FIGS. 1 (a) and 1 (b) are referred to facilitate the understanding of the present invention, and the present invention is intended to be limited to the configurations of FIGS. 1 (a) and 1 (b). It is not a thing.
- the tooth width (W2) of the first internal gear (2) and the tooth width (W3) of the second internal gear (3) are the same.
- the first and second internal gears are arranged at (2, 3) symmetrical positions around the orthogonal plane (PL) passing through the tooth width center (P1) and orthogonal to the central axis (1a).
- the first internal gear (2) is a stationary-side internal gear fixed so as not to rotate and the second internal gear (3) is a drive-side internal gear that outputs reduced rotation
- the support center (P2) is shifted toward the drive-side internal gear (3) with respect to the tooth width center (P1) of the external teeth, the stationary-side internal gear (2) and the external gear (4 ) To suppress tooth surface wear.
- the support center (P2) is shifted toward the stationary side internal gear (2) with respect to the tooth width center (P1), an effect of increasing ratcheting torque can be obtained.
- the support is provided.
- the first internal gear (2A) is located on one side in the direction of the central axis (1a) around the orthogonal plane (PL) passing through the center (P2) and orthogonal to the central axis (1a), and the other side
- the second internal gear (3A) is located at
- the shift amount ( ⁇ ) of the support center (P2) with respect to the tooth width center (P1) is preferably set to a value within the range of 1% to 4% of the pitch circle diameter of the external gear (4).
- the deviation amount ( ⁇ ) is set to an appropriate amount according to specific operating conditions and the like. When the deviation amount ( ⁇ ) increases, it is highly likely that the mechanical characteristics of the internal gear on the side away from the support center (P2) are greatly deteriorated. Therefore, in practice, the deviation amount ( ⁇ ) may be set to a value within the range of 1% to 4% of the pitch circle diameter of the external gear (4).
- the wave generator (5) generally includes a wave plug (6) and a wave bearing (7) attached to the outer peripheral surface of the wave plug (6) as shown in FIG.
- the wave bearing (7) includes an outer ring (8) that can be bent in the radial direction, and an outer peripheral surface of the outer ring (8) is an external tooth support surface (5a).
- the support center (P2) is the center position in the direction of the central axis (1a) in the rolling element (9) of the wave bearing (7). As shown in the figure, when the rolling element (9) is a ball, the support center (P2) coincides with the ball center.
- the number of teeth of the first internal gear (2) is the first number of teeth
- the number of teeth of the second internal gear (3) is the second number of teeth less than the first number of teeth.
- the number of teeth of the external gear (4) is set to be the same as the second number of teeth.
- (A) And (b) is explanatory drawing which shows the wave gear apparatus of this invention.
- (A) And (b) is the end elevation and longitudinal cross-sectional view of the wave gear apparatus which concern on embodiment to which this invention is applied. It is a longitudinal cross-sectional view which shows the modification of the wave gear apparatus of FIG. It is the end view and longitudinal cross-sectional view which show the conventional wave gear apparatus.
- FIG. 2 (a) is an end view of the wave gear device according to the embodiment
- FIG. 2 (b) is a longitudinal sectional view thereof.
- the wave gear device 10 includes a first internal gear 12 and a second internal gear 13 that are arranged in parallel in the direction of the central axis 10a. Inside these first and second internal gears 12 and 13, a cylindrical external gear 14 that can be bent in the radial direction is arranged coaxially. The external gear 14 can mesh with each of the first and second internal gears 12 and 13.
- a wave generator 15 is coaxially disposed inside the external gear 14. The wave generator 15 bends the external gear 14 in a non-circular direction in the radial direction and partially meshes the external gear 14 with each of the first and second internal gears 12 and 13.
- the first internal gear 12 is a stationary internal gear fixed to a fixed member (not shown), and the second internal gear 13 is a drive-side internal gear that outputs reduced speed rotation.
- the number of teeth of the stationary-side first internal gear 12 is greater than the number of teeth of the driving-side second internal gear 13. Further, the tooth widths of the internal teeth 12a and 13a of the first and second internal gears 12 and 13 are the same.
- the external teeth 14a of the external gear 14 mesh with the internal teeth 12a and 13a of both the first and second internal gears 12 and 13 over the entire width direction of these internal teeth 12a and 13a. It has the possible tooth width.
- the first and second internal gears 12 and 13 are arranged in parallel with a slight gap, and the tooth width of the external teeth 14a is substantially equal to approximately twice that of the internal teeth 12a and 13a.
- the number of teeth of the external gear 14 is the same as the number of teeth of the second internal gear 13 on the drive side.
- the wave generator 15 includes a wave plug 16 having an elliptical outline and a predetermined thickness, and a wave bearing 17 attached to the elliptical outer peripheral surface of the wave plug 16.
- a boss 16b having a shaft hole 16a for attaching a motor shaft (not shown) or the like is formed at the center of the wave plug 16.
- the wave bearing 17 includes an outer ring 18a and an inner ring 18b that can be bent in the radial direction, and a plurality of balls 19 that are mounted so as to be able to roll therebetween.
- An outer peripheral surface of the outer ring 18 a that is bent in an elliptical shape is an outer ring support surface 15 a that is in contact with the inner peripheral surface 14 b of the external gear 14.
- the external gear 14 is bent elliptically by a wave generator 15 and meshes with both the first and second internal gears 12 and 13 at the positions of both ends of the long axis of the elliptical shape.
- the wave generator 15 When the wave generator 15 is rotated, the meshing position of the first and second internal gears 12 and 13 and the external gear 14 moves in the circumferential direction.
- the number of teeth of the first internal gear 12 is 2n more than the number of teeth of the second internal gear 13 and the number of teeth of the external gear 14 (n: positive integer). For example, there are two more.
- the wave generator 15 rotates once, relative rotation occurs between the first internal gear 12 and the external gear 14 by the difference in the number of teeth. Since the first internal gear 12 is a stationary internal gear fixed so as not to rotate, the external gear 14 rotates.
- the other second internal gear 13 meshing with the external gear 14 has the same number of teeth as the external gear 14, and therefore rotates integrally with the external gear 14.
- the center position in the tooth width direction of the external teeth 14a of the external gear 14 is defined as a tooth width center P1.
- the center position in the direction of the central axis 10a on the external tooth support surface 15a of the wave generator 15 is defined as a support center P2.
- the support center P2 coincides with the center of the ball 19 that is a rolling element in the direction of the central axis 10a.
- the support center P2 of the wave generator 15 is shifted to the stationary-side first internal gear 12 side along the direction of the central axis 10a with respect to the tooth width center P1 of the external gear 14.
- These deviation amounts ⁇ are set to values within a range of 1% to 4% of the pitch circle diameter of the external gear 14 in a perfect circle state before being bent into an elliptical shape.
- the first and second internal gears 12 and 13 are disposed at symmetrical positions around an orthogonal plane PL that passes through the tooth width center P1 and is orthogonal to the central axis 10a.
- FIG. 3 is a longitudinal sectional view showing a modification of the wave gear device 10 of FIG.
- the support center P2 of the external tooth 14a by the wave generator 15 is set to the second internal tooth on the driving side along the direction of the central axis 10a with respect to the tooth width center P1 of the external tooth 14a. It is shifted to the gear 13 side. If it does in this way, compared with the case where the support center P2 of an external tooth and the tooth width center P1 correspond (refer FIG. 4), the tooth surface abrasion resulting from the meshing of the internal tooth 13a and the external tooth 14a can be suppressed. .
- the tooth widths of the first and second internal gears 12 and 13 are the same, but the teeth of the first and second internal gears 12 and 13 are as shown in FIG.
- the present invention can also be applied when the widths are different.
- the tooth width of the external teeth 4a is substantially equal to the sum of the tooth widths of the internal teeth 2b of the first internal gear 2A and the internal teeth 3b of the second internal gear 3A.
- the first and second internal gears 2A and 3A are arranged on both sides of an orthogonal plane PL passing through the external tooth support center P2 by the wave generator.
- a ball bearing having flexible inner and outer rings is used for the wave generator.
- a needle roller bearing having flexible inner and outer rings can be used for the wave generator.
- the wave generator it is possible to use a wave generator provided with a pair of rollers or a wave generator provided with a plurality of pairs of rollers described in Patent Document 4 cited above.
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Abstract
Description
条件A2:外歯歯車104は、これら第1、第2内歯歯車102、103のそれぞれの歯幅の略2倍の歯幅を備えた歯車である。
条件A3:外歯歯車104の歯幅中心P1(歯幅方向の中央位置)を通り、波動歯車装置100の中心軸線100aに直交する直交面PLを中心として、第1、第2内歯歯車102、103は、左右対称に配置されている。換言すると、外歯歯車104の歯幅中心P1に、第1、第2内歯歯車102、103の間の中央位置P3が一致する。
条件A4:直交面PLを中心として、ウエーブジェネレータ105は左右対称となるように配置されている。換言すると、外歯歯車104の歯幅中心P1に、ウエーブジェネレータ105による外歯の支持中心P2(ボール中心)が一致する。
中心軸線(1a)の方向に並列配置された第1内歯歯車(2、2A)および第2内歯歯車(3、3A)と、
第1、第2内歯歯車(2、3)の内側に配置され、当該第1、第2内歯歯車(2、3)のそれぞれにかみ合い可能な筒状をした可撓性の外歯歯車(4)と、
外歯歯車(4)の内側に配置され、当該外歯歯車(4)を半径方向に撓めて第1、第2内歯歯車(2、3)のそれぞれに対して部分的にかみ合わせているウエーブジェネレータ(5)と、
を有し、
外歯歯車(4)の外歯(4a)は、第1、第2内歯歯車(2、3)(2A、3A)の双方の内歯(2a、3a)(2b、3b)に対して、これらの内歯(2a、3a)(2b、3b)の歯幅方向の全体に亘ってかみ合い可能な歯幅を備え、
ウエーブジェネレータ(5)は、外歯歯車(4)の内周面に当接して当該外歯歯車を半径方向に非円形となるように撓める外歯支持面(5a)を備え、
中心軸線(1a)の方向における外歯支持面(5a)の中心位置を支持中心(P2)と呼び、外歯(4a)の歯幅方向の中央位置を歯幅中心(P1)と呼ぶものとすると、
支持中心(P2)は、歯幅中心(P1)に対して、中心軸線(1a)の方向に沿って、第1内歯歯車(2)の側あるいは第2内歯歯車(3)の側にずれた位置に設定されていることを特徴としている。
上記の実施の形態では、第1、第2内歯歯車12、13の歯幅が同一であるが、図1(b)に示すように、第1、第2内歯歯車12、13の歯幅が異なる場合にも本発明を適用可能である。この場合においても、外歯4aの歯幅は、第1内歯歯車2Aの内歯2bと第2内歯歯車3Aの内歯3bの歯幅の合計にほぼ等しい。また、第1、第2内歯歯車2A、3Aは、ウエーブジェネレータによる外歯の支持中心P2を通る直交面PLを中心として、その両側に配置される。
Claims (6)
- 中心軸線(1a)の方向に並列配置された第1内歯歯車(2、2A)および第2内歯歯車(3、3A)と、
前記第1、第2内歯歯車(2、3)の内側に配置され、当該第1、第2内歯歯車(2、3)のそれぞれにかみ合い可能な筒状をした可撓性の外歯歯車(4)と、
前記外歯歯車(4)の内側に配置され、当該外歯歯車(4)を半径方向に撓めて前記第1、第2内歯歯車(2、3)のそれぞれに対して部分的にかみ合わせているウエーブジェネレータ(5)と、
を有し、
前記外歯歯車(4)の外歯(4a)は、前記第1、第2内歯歯車(2、3)(2A、3A)の双方の内歯(2a、3a)(2b、3b)に対して、これらの内歯(2a、3a)(2b、3b)の歯幅方向の全体に亘ってかみ合い可能な歯幅を備え、
前記ウエーブジェネレータ(5)は、前記外歯歯車(4)の内周面に当接して当該外歯歯車を半径方向に非円形となるように撓める外歯支持面(5a)を備え、
前記中心軸線(1a)の方向における前記外歯支持面(5a)の中心位置を支持中心(P2)と呼び、前記外歯(4a)の歯幅方向の中央位置を歯幅中心(P1)と呼ぶものとすると、
前記支持中心(P2)は、前記歯幅中心(P1)に対して、前記中心軸線(1a)の方向に沿って、前記第1内歯歯車(2)の側あるいは前記第2内歯歯車(3)の側にずれた位置に設定されていることを特徴とする波動歯車装置(1、1A)。 - 前記第1内歯歯車(2)の歯幅(W2)と前記第2内歯歯車(3)の歯幅(W3)が同一であり、
前記歯幅中心(P1)を通り前記中心軸線(1a)に直交する直交面(PL)を中心として、前記第1、第2内歯歯車(2、3)は対称の位置に配置されている請求項1に記載の波動歯車装置(1)。 - 前記第1内歯歯車(2A)の歯幅(W2A)と前記第2内歯歯車(3A)の歯幅(W3A)が異なり、
前記支持中心(P2)を通り前記中心軸線(1a)に直交する直交面(PL)を中心として、前記中心軸線(1c)の方向における一方の側に前記第1内歯歯車(2A)が位置し、他方の側に前記第2内歯歯車(3A)が位置している請求項1に記載の波動歯車装置(1A)。 - 前記歯幅中心(P1)に対する前記支持中心(P2)のずれ量(Δ)は、前記外歯歯車(4)のピッチ円直径の1%~4%の範囲内の値である請求項1ないし3のうちのいずれか一つの項に記載の波動歯車装置(1、1A)。
- ウエーブジェネレータ(5)は、ウエーブプラグ(6)と、このウエーブプラグ(6)の外周面に装着したウエーブベアリング(7)とを備え、
前記ウエーブベアリング(7)は半径方向に撓み可能な外輪(8)を備え、
前記外輪(8)の外周面が前記外歯支持面(5a)であり、
前記支持中心(P2)は、前記ウエーブベアリング(7)の転動体(9)における前記中心軸線(1a)の方向の中央位置である請求項1ないし4のうちのいずれか一つの項に記載の波動歯車装置(1、1A)。 - 前記第1内歯歯車(2)の歯数は第1歯数であり
前記第2内歯歯車(3)の歯数は、前記第1歯数よりも少ない第2歯数であり、
前記外歯歯車(4)の歯数は前記第2歯数と同一に設定される請求項1ないし5のうちのいずれか一つの項に記載の波動歯車装置(1、1A)。
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015528075A JP6177327B2 (ja) | 2013-07-25 | 2013-07-25 | 波動歯車装置 |
| US14/906,861 US9797497B2 (en) | 2013-07-25 | 2013-07-25 | Strain wave gearing |
| PCT/JP2013/070245 WO2015011820A1 (ja) | 2013-07-25 | 2013-07-25 | 波動歯車装置 |
| DE112013007274.2T DE112013007274B4 (de) | 2013-07-25 | 2013-07-25 | Spannungswellengetriebe |
| CN201380077929.8A CN105452715B (zh) | 2013-07-25 | 2013-07-25 | 谐波齿轮装置 |
| KR1020167002050A KR20160024970A (ko) | 2013-07-25 | 2013-07-25 | 파동기어장치 |
| TW103123628A TWI632309B (zh) | 2013-07-25 | 2014-07-09 | Harmonic gear unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2013/070245 WO2015011820A1 (ja) | 2013-07-25 | 2013-07-25 | 波動歯車装置 |
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| WO2015011820A1 true WO2015011820A1 (ja) | 2015-01-29 |
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| PCT/JP2013/070245 Ceased WO2015011820A1 (ja) | 2013-07-25 | 2013-07-25 | 波動歯車装置 |
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| US (1) | US9797497B2 (ja) |
| JP (1) | JP6177327B2 (ja) |
| KR (1) | KR20160024970A (ja) |
| CN (1) | CN105452715B (ja) |
| DE (1) | DE112013007274B4 (ja) |
| TW (1) | TWI632309B (ja) |
| WO (1) | WO2015011820A1 (ja) |
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| CN105422797A (zh) * | 2015-11-30 | 2016-03-23 | 綦江精锐达重型齿轮有限公司 | 一种双重式齿轮 |
| CN105402324A (zh) * | 2015-11-30 | 2016-03-16 | 綦江精锐达重型齿轮有限公司 | 一种齿轮装置 |
| CN105422747A (zh) * | 2015-11-30 | 2016-03-23 | 綦江精锐达重型齿轮有限公司 | 一种双重式齿轮传动装置 |
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| JP6793867B1 (ja) * | 2020-06-29 | 2020-12-02 | 株式会社ハーモニック・ドライブ・システムズ | 波動歯車装置ユニット |
| DE102022124529B3 (de) * | 2022-09-23 | 2023-12-21 | Harmonic Drive Se | Flachgetriebe |
| NO20230767A1 (en) | 2023-07-07 | 2025-01-08 | Eltorque As | Hollow actuator with strain wave gear and self-lock for emergency operation |
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| EP2184514A1 (de) * | 2008-10-30 | 2010-05-12 | Ovalo GmbH | Spannungswellengetriebe |
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| JP2008208866A (ja) | 2007-02-23 | 2008-09-11 | Jtekt Corp | 波動歯車減速機及び伝達比可変操舵装置 |
| JP4767892B2 (ja) | 2007-03-27 | 2011-09-07 | 日信工業株式会社 | 車両用ディスクブレーキ |
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| JP2011190826A (ja) | 2010-03-11 | 2011-09-29 | Matex Kk | 波動歯車装置 |
| DE102011004075A1 (de) | 2011-02-14 | 2012-08-16 | Schaeffler Technologies Gmbh & Co. Kg | Wellgetriebe mit seitlicher Führung des Stirnrades |
| DE102011004074A1 (de) | 2011-02-14 | 2012-08-16 | Schaeffler Technologies Gmbh & Co. Kg | Wellgetriebe mit steifigkeitsoptimiertem Wellgenerator |
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- 2013-07-25 CN CN201380077929.8A patent/CN105452715B/zh active Active
- 2013-07-25 KR KR1020167002050A patent/KR20160024970A/ko not_active Ceased
- 2013-07-25 JP JP2015528075A patent/JP6177327B2/ja active Active
- 2013-07-25 US US14/906,861 patent/US9797497B2/en active Active
- 2013-07-25 WO PCT/JP2013/070245 patent/WO2015011820A1/ja not_active Ceased
- 2013-07-25 DE DE112013007274.2T patent/DE112013007274B4/de active Active
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| JPH034054A (ja) * | 1989-06-01 | 1991-01-10 | Harmonic Drive Syst Ind Co Ltd | 波動歯車装置 |
| JPH09166186A (ja) * | 1995-12-15 | 1997-06-24 | Harmonic Drive Syst Ind Co Ltd | 非干渉広域かみ合い歯形を有する撓みかみ合い式歯車装置 |
| JP2007527968A (ja) * | 2004-02-25 | 2007-10-04 | シエツフレル コマンディートゲゼルシャフト | 電動式のカム軸調節装置 |
| EP2184514A1 (de) * | 2008-10-30 | 2010-05-12 | Ovalo GmbH | Spannungswellengetriebe |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109282010A (zh) * | 2017-07-20 | 2019-01-29 | 住友重机械工业株式会社 | 挠曲啮合式齿轮装置 |
| JP2019019944A (ja) * | 2017-07-20 | 2019-02-07 | 住友重機械工業株式会社 | 撓み噛合い式歯車装置 |
| CN109282010B (zh) * | 2017-07-20 | 2021-11-05 | 住友重机械工业株式会社 | 挠曲啮合式齿轮装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2015011820A1 (ja) | 2017-03-02 |
| DE112013007274T5 (de) | 2016-04-14 |
| JP6177327B2 (ja) | 2017-08-09 |
| US20160160985A1 (en) | 2016-06-09 |
| TW201525327A (zh) | 2015-07-01 |
| TWI632309B (zh) | 2018-08-11 |
| CN105452715A (zh) | 2016-03-30 |
| CN105452715B (zh) | 2017-11-28 |
| DE112013007274B4 (de) | 2024-01-18 |
| KR20160024970A (ko) | 2016-03-07 |
| US9797497B2 (en) | 2017-10-24 |
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