WO2005124189A1 - 負偏位噛み合い歯形を有する波動歯車装置 - Google Patents
負偏位噛み合い歯形を有する波動歯車装置 Download PDFInfo
- Publication number
- WO2005124189A1 WO2005124189A1 PCT/JP2004/008714 JP2004008714W WO2005124189A1 WO 2005124189 A1 WO2005124189 A1 WO 2005124189A1 JP 2004008714 W JP2004008714 W JP 2004008714W WO 2005124189 A1 WO2005124189 A1 WO 2005124189A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gear
- tooth
- external gear
- flexible external
- teeth
- 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
Links
Classifications
-
- 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
- F16H55/08—Profiling
- F16H55/0833—Flexible toothed member, e.g. harmonic drive
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19949—Teeth
- Y10T74/19963—Spur
- Y10T74/19972—Spur form
Definitions
- Wave gear device having negative displacement engagement and tooth profile
- the present invention relates to a wave gear device having a reduced speed ratio, and more particularly, to a wave gear device having a negatively displaced meshing tooth suitable for increasing ratcheting torque.
- the wave gear device was invented by CW Musser (Patent Document 1), and since then, many researchers including the present inventors have invented various wave gear devices, including the inventor of the present application. I have.
- Various kinds of inventions have been proposed even if the invention is limited to the tooth profile of the wave gear device.
- the inventor of the present application has proposed that the basic tooth profile be an involute tooth profile (Patent Document 2), and that a method of approximating the engagement between the teeth of a rigid internal gear and a flexible external gear with a rack by using a rack is used.
- a tooth profile design method for deriving the addendum tooth profile of both gears is proposed (Patent Documents 3 and 4).
- an invention for avoiding tooth profile interference caused by the rack approximation has also been proposed (Patent Document 5).
- Patent document 1 U.S. Pat.No. 2,906,143
- Patent Document 2 Japanese Patent Publication No. 45-41171
- Patent Document 3 JP-A-63-115943
- Patent Document 4 JP-A-64-79448
- Patent Document 5 JP-A-7-167228
- An object of the present invention is to provide a wave gear device provided with a negatively displaced tooth profile that is displaced in an elliptical shape with a radius smaller than a normal radius, in order to prevent rattling, in order to prevent rattling.
- the aim is to make the teeth as large as possible.
- the present invention includes an annular rigid internal gear, a flexible external gear disposed inside the internal gear, and a wave generator fitted inside the internal gear.
- the flexible external gear includes a flexible cylindrical body, a rear end force of the cylindrical body, and an annular diaphragm extending in a radial direction.
- a tooth portion formed at a portion on the open end side extends from the rear end portion on the diaphragm side to the front end portion on the open end side by the wave generator, and has a radius substantially proportional to a distance from the diaphragm.
- the rigid internal gear and the flexible external gear are basically spur gears of module m, and the number of teeth of the flexible external gear is 2n (n is a positive integer) less than the number of teeth of the rigid internal gear.
- a cross section perpendicular to the axis (hereinafter, referred to as a main cross section) selected at an arbitrary position in the tooth trace direction of the flexible external gear, the radius of the major axis of the elliptical rim neutral line of the flexible external gear Is 2 / c mn ( ⁇ ⁇ 1),
- a first similar curve obtained by enlarging the curve portion by ⁇ times is adopted as the tooth profile of the flexible external gear
- the range of the tooth profile of the rigid internal gear is set so that the tooth tip touches the moving locus of the tooth tip of the flexible external gear.
- the range of the tooth profile of the rigid internal gear is set so that the tooth tip touches a maximum point on the movement locus of the tooth tip of the flexible external gear.
- the present invention relates to a wave gear device in which a flexible external gear has an elliptical radius with a radius of negative deviation (c ⁇ 1).
- the similarity curve obtained by approximating by approximation and enlarging the similar curve portion on the entry side of the engagement from the deepest engagement position, which is the top of the rack movement trajectory, is used as the basic tooth profile of both gears. Then, make both gears contact continuously.
- the ratchet of both gears is increased by increasing the size of the gear as much as possible, and the ratcheting torque is increased. That is, the maximum value of ⁇ is the position where the tooth tip of the rigid internal gear and the tooth of the flexible external gear come on the movement locus. If ⁇ is further increased, the tooth tips of both gears interfere with each other. In the present invention, the ratcheting torque is increased by increasing the tooth height as much as possible without causing interference between the two gears.
- the effectiveness of both gears is also provided at a portion other than the main cross section of the flexible external gear.
- the tooth tip of the flexible external gear is the rigid internal gear. It is preferable that the flexible external gear be relieved from the position of the main cross section to the front end on the opening side along the tooth bottom of the flexible external gear.
- the flexible external gear is a conical gear having the same height teeth
- the tip of the flexible external gear has a tooth tip on an axial section including a long axis after deformation of the flexible external gear.
- Rigid internal gear teeth The shape of the cylindrical surface of the tip of the flexible external gear is gradually reduced from the rear end on the diaphragm side in the tooth trace direction to the front end on the opening side so as to be parallel to the tooth bottom.
- a conical surface may be used.
- the teeth of the flexible external gear have It is desirable that the relief is applied from the position of the main section to the front end on the opening side and the rear end on the diaphragm side along the tooth trace direction.
- the wave gear device according to the present invention which has a tooth profile with a large negative tooth deviation, is suitable for use when the number of teeth of both gears is a reduced speed ratio of 124 or less.
- the present invention provides a wave gear device in which a flexible external gear has an elliptical radius with a radius of negative deviation ( ⁇ 1), and sets the gears of both gears as much as possible. It can be large. Also, the movement locus of the meshing of the teeth of both gears is approximated by a rack, and the deepest meshing point, which is the top of the rack's moving track, and the curve on the entry side of the meshing position from the position are similar. By using the enlarged similar curve as the basic tooth profile of both gears, both gears can be brought into continuous contact.
- FIG. 1 is a front view of a wave gear device that is an object of the present invention
- FIG. 2 is a cross-sectional view showing a state in which an opening of the flexible external gear is bent in an elliptical shape, including a cross section including a shaft.
- (a) is the state before deformation
- (b) is the cross section including the major axis of the ellipse after deformation
- (c) is the ellipse after deformation.
- the cross sections including the short axis of the circle are shown.
- a solid line indicates a cup-shaped flexible external gear
- a broken line indicates a sinorek hat-shaped flexible external gear.
- the wave gear device 1 includes an annular rigid internal gear 2, a flexible external gear 3 disposed inside the rigid internal gear 2, and an elliptical contour fitted inside the rigid internal gear 2.
- a wave generator 4 The difference in the number of teeth between the rigid internal gear 2 and the flexible external gear 3 is 2n (n is a positive integer), and the flexible external gear 3 of the wave gear device 1 is driven by a wave generator 4 having an elliptical contour. It is bent into an elliptical shape and meshes with the rigid internal gear 2 at both ends in the direction of the major axis L1 of the elliptical shape.
- the wave generator 4 includes a rigid cam plate 41 fixed to a rotating shaft (not shown), and a wave bearing 42 mounted on the outer peripheral surface.
- the wave bearing 42 includes flexible inner and outer rings 43 and 44 and a plurality of balls 45 rotatably inserted therebetween.
- the flexible external gear 3 includes a flexible cylindrical body 31, a diaphragm 32 continuously extending in a radial direction at a rear end 31 a, and a diaphragm 32.
- a boss 33 continuous with 32 and external teeth 34 formed on the outer peripheral surface of the cylindrical body 31 on the side of the open end 31b are provided.
- the cylindrical body 31 is moved from the rear end 31a of the diaphragm side to the open end 31b by the wave generator 4 having an elliptical contour fitted into the inner peripheral surface portion of the external tooth forming part of the cylindrical body 31.
- the amount of radial outward or inward radial increase is gradually increasing.
- the outward radius gradually increases in proportion to the distance from the rear end 31a to the open end 31b. I have.
- Fig. 2 (c) in the section including the elliptical minor axis L2, the amount of inward radius gradually increases in proportion to the distance from the rear end 31a to the open end 31b. . Therefore, the external teeth 34 formed on the outer peripheral surface portion on the side of the opening end 31b also extend from the rear end 34a in the tooth trace direction toward the front end 34b on the opening side from the cylindrical body rear end 31a. The amount of radius gradually increases in proportion to the distance of.
- FIG. 3 is a diagram showing the movement locus of the teeth of the flexible external gear 3 with respect to the rigid internal gear 2 obtained when the relative movement of the two gears 2 and 3 of the wave gear device 1 is approximated by a rack.
- This movement trajectory M is the main cross section (the external teeth of the flexible external gear 3 (A cross section perpendicular to the axis selected at a predetermined position in the tooth trace direction).
- the movement locus M of the teeth of the gear 3 is given by the following equation.
- the kappa force is a radius coefficient smaller than S “l”, and m is a module. Note that the total amplitude of the movement trajectory M of the flexible external gear 3 is 2 ⁇ mn.
- FIG. 4 is an explanatory diagram showing a use range of the tooth movement locus M.
- the movement trajectory M from the point A, which is the inflection point of the movement trajectory M, to the y-axis (radius line of the rigid internal gear)
- the movement trajectory part AB up to point B at the deepest position where the inclination angle (pressure angle) of the tangent to is 90 degrees.
- the teeth of the flexible external gear 3 enter the tooth space of the rigid internal gear 2 and reach the deepest position B from the eight points on the near side (the inflection point of the movement locus M). It begins to contact the teeth of internal gear 2.
- the tooth profile of both gears 2 and 3 is obtained as described below.
- a part AC of a movement trajectory part AB of a use range is taken, and a first similar curve FG obtained by multiplying the curve part AC by ⁇ is taken out of flexibility. Used as gear 3 gear.
- the second similar curve DE obtained by multiplying the curve portion AC by (E + 1) is adopted as the tooth profile of the rigid internal gear 2.
- the two tooth profiles determined in this way have similar characteristics, so that the point F 'on the tooth profile FG and the tangent at that point move the trajectory up to the point C'. When it moves, it overlaps with the point D 'on the tooth profile DE and the tangent at that point, and can continuously engage between the movement locus AC.
- the maximum value is the position where the tooth tip of the rigid internal gear 2 comes on the movement locus ⁇ . If it is larger than this, the tips of both gears will interfere.
- FIG. 5 (a) shows this case.
- the extreme value of the maximum value of ⁇ is when the position of the maximum amplitude (maximum value) of the movement trajectory ⁇ is selected as the tooth tip of the rigid internal gear 2.
- FIG. 6 shows the movement of one tooth of the flexible external gear 3 with respect to one tooth of the rigid internal gear 2 in the main cross section.
- This figure shows a case in which the number of teeth of the rigid internal gear 2 is 10 2 and the number of teeth of the flexible external gear 3 is 100, which is a finite number of teeth.
- Near the rack of the present invention This shows that the tooth profile setting based on the similarity is effective even when the number of teeth is limited.
- the above description relates to a method of forming a tooth profile on the main cross section of the flexible external gear 3.
- the tooth profile should be formed as follows.
- the main cross section is taken at the rear end portion 34a on the diaphragm side, and the meshing can be maintained at each cross section of the tooth trace extending over the front end portion 34b on the opening end side. As described above, it is desirable to perform the releasing toward the front end 34b.
- the main section S is taken at the rear end portion 34a on the diaphragm side, and is also taken along each cross section in the tooth trace direction from the front end portion 34b on the opening side to the rear end portion 34a.
- the flexible external gear 3 is formed as a conical gear with constant teeth having a small diameter toward the front end 34b so that the engagement can be maintained.
- the shape of the tooth top cylindrical surface 34c is formed into a conical surface having a large diameter toward the rear end portion 34a of the flexible external gear 3, and a section perpendicular to the axis including the major axis of the wave generator 4 is formed.
- FIG. 7 (b) shows the state of engagement of the flexible external gear 3 with the rigid internal gear 2 in a cross section including the long axis in the elliptical bent by the wave generator 4. It is a thing.
- FIG. 8 is an explanatory diagram showing the engagement of the rear end portion 34a in the tooth trace direction, which is the main cross section S, in the case where the flexible external gear 3 is a conical gear. This is the maximum case.
- FIG. 9 is an explanatory diagram showing a meshing state at the front end 34b (the end on the opening end side) of the tooth trace. From this figure, it can be seen that, even in cross sections other than the main cross section, meshing of the tooth profile can be seen approximately.
- FIG. 10 shows an example of relieving in this case.
- the dashed line A is the tooth profile when the tooth profile in the main section S is adopted over the entire tooth trace direction, and the tooth profile obtained by applying relief to this tooth profile is shown by the solid line B. It is something.
- FIG. 1 is a schematic front view of a wave gear device that is an object of the present invention.
- FIG. 2 is an explanatory view showing a radial state of a flexible external gear in a cross section including an axis, in which (a) is a state before deformation, and (b) is a cross section including a long axis after being deformed into an elliptical shape. (C) is a cross section including the short axis.
- FIG. 3 is a trajectory of a rack movement when K ⁇ 1, which is the basis of tooth formation according to the present invention.
- FIG. 4 is an explanatory diagram showing a range used for forming a tooth profile in the movement trajectory of FIG. 3.
- FIG. 5 is an explanatory diagram showing an example of setting the tooth profile of both gears.
- FIG. 6 is an explanatory view showing movement of one tooth of a flexible external gear with respect to one tooth of a rigid internal gear in a main cross section.
- FIG. 7 is a cross-sectional view before deformation and a cross-sectional view showing a meshing state after deformation when the flexible external gear is a conical gear.
- FIG. 8 is an explanatory diagram showing the engagement in the main cross section of both gears.
- FIG. 9 is an explanatory diagram showing engagement of rear end portions (ends on the opening side) of the tooth traces of both gears in a cross section perpendicular to the axis.
- FIG. 10 is an explanatory view showing the relieving applied to the teeth of the flexible external gear when the main cross section is taken at the center of the ball of the wave bearing of the wave generator.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Retarders (AREA)
- Gears, Cams (AREA)
Abstract
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE112004002907.4T DE112004002907B4 (de) | 2004-06-21 | 2004-06-21 | Wellgetriebe-Trieb mit Zahnprofil, das mit Negativausbiegung kämmt |
| JP2006514636A JP4650954B2 (ja) | 2004-06-21 | 2004-06-21 | 負偏位噛み合い歯形を有する波動歯車装置 |
| PCT/JP2004/008714 WO2005124189A1 (ja) | 2004-06-21 | 2004-06-21 | 負偏位噛み合い歯形を有する波動歯車装置 |
| US11/579,767 US7735396B2 (en) | 2004-06-21 | 2004-06-21 | Wave gear drive having negative deflection meshing tooth profile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2004/008714 WO2005124189A1 (ja) | 2004-06-21 | 2004-06-21 | 負偏位噛み合い歯形を有する波動歯車装置 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005124189A1 true WO2005124189A1 (ja) | 2005-12-29 |
Family
ID=35509759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/008714 Ceased WO2005124189A1 (ja) | 2004-06-21 | 2004-06-21 | 負偏位噛み合い歯形を有する波動歯車装置 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7735396B2 (ja) |
| JP (1) | JP4650954B2 (ja) |
| DE (1) | DE112004002907B4 (ja) |
| WO (1) | WO2005124189A1 (ja) |
Cited By (5)
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|---|---|---|---|---|
| JP2007211907A (ja) * | 2006-02-09 | 2007-08-23 | Harmonic Drive Syst Ind Co Ltd | 連続噛み合い高ラチェティングトルク歯形を有する波動歯車装置 |
| WO2010023710A1 (ja) * | 2008-08-29 | 2010-03-04 | 株式会社ハーモニック・ドライブ・システムズ | 正偏位噛み合い複合歯形を有する波動歯車装置 |
| DE102012209201A1 (de) | 2011-06-01 | 2012-12-06 | Harmonic Drive Systems Inc. | Wellgetriebe mit einem konisch zulaufenden, flexiblen, außen verzahnten Zahnrad |
| WO2015079576A1 (ja) * | 2013-11-29 | 2015-06-04 | 株式会社ハーモニック・ドライブ・システムズ | 2度接触の負偏位歯形を有する波動歯車装置 |
| KR20160087806A (ko) | 2014-12-09 | 2016-07-22 | 가부시키가이샤 하모닉 드라이브 시스템즈 | 추월형 맞물림의 음편위 파동 기어 장치 |
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| US8028603B2 (en) * | 2007-12-04 | 2011-10-04 | Harmonic Drive Systems Inc. | Method for setting gear tooth profile in flat wave gear device on side where gears have same number of teeth |
| WO2010070712A1 (ja) * | 2008-12-18 | 2010-06-24 | 株式会社ハーモニック・ドライブ・システムズ | 3次元接触可能な転位歯形を有する波動歯車装置 |
| US8770064B2 (en) * | 2009-01-13 | 2014-07-08 | Harmonic Drive Systems Inc. | Wave generator for wave gear device |
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| CN104819267B (zh) * | 2015-05-13 | 2017-03-22 | 广州市昊志机电股份有限公司 | 一种采用非干涉且大范围啮合齿廓的谐波齿轮装置 |
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- 2004-06-21 US US11/579,767 patent/US7735396B2/en active Active
- 2004-06-21 JP JP2006514636A patent/JP4650954B2/ja not_active Expired - Lifetime
- 2004-06-21 WO PCT/JP2004/008714 patent/WO2005124189A1/ja not_active Ceased
- 2004-06-21 DE DE112004002907.4T patent/DE112004002907B4/de not_active Expired - Lifetime
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| JPS6275153A (ja) * | 1985-09-30 | 1987-04-07 | Tsubakimoto Chain Co | ハ−モニツクドライブ装置 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007211907A (ja) * | 2006-02-09 | 2007-08-23 | Harmonic Drive Syst Ind Co Ltd | 連続噛み合い高ラチェティングトルク歯形を有する波動歯車装置 |
| JP5117570B2 (ja) * | 2008-08-29 | 2013-01-16 | 株式会社ハーモニック・ドライブ・システムズ | 正偏位噛み合い複合歯形を有する波動歯車装置 |
| WO2010023710A1 (ja) * | 2008-08-29 | 2010-03-04 | 株式会社ハーモニック・ドライブ・システムズ | 正偏位噛み合い複合歯形を有する波動歯車装置 |
| US8661939B2 (en) | 2008-08-29 | 2014-03-04 | Harmonic Drive Systems Inc. | Wave gear device having compound tooth profile of positive deflection meshing |
| US8910545B2 (en) | 2011-06-01 | 2014-12-16 | Harmonic Drive Systems, Inc. | Wave gear device provided with tapered flexible externally toothed gear |
| JP2012251588A (ja) * | 2011-06-01 | 2012-12-20 | Harmonic Drive Systems Inc | テーパ型の可撓性外歯車を備えた波動歯車装置 |
| DE102012209201A1 (de) | 2011-06-01 | 2012-12-06 | Harmonic Drive Systems Inc. | Wellgetriebe mit einem konisch zulaufenden, flexiblen, außen verzahnten Zahnrad |
| DE102012209201B4 (de) | 2011-06-01 | 2024-04-18 | Harmonic Drive Systems Inc. | Wellgetriebe mit einem konisch zulaufenden, flexiblen, außen verzahnten Zahnrad |
| WO2015079576A1 (ja) * | 2013-11-29 | 2015-06-04 | 株式会社ハーモニック・ドライブ・システムズ | 2度接触の負偏位歯形を有する波動歯車装置 |
| JP6017063B2 (ja) * | 2013-11-29 | 2016-10-26 | 株式会社ハーモニック・ドライブ・システムズ | 2度接触の負偏位歯形を有する波動歯車装置 |
| US9746065B2 (en) | 2013-11-29 | 2017-08-29 | Harmonic Drive System Inc. | Strain wave gearing having double-contact negative deflection tooth profile |
| KR20160087806A (ko) | 2014-12-09 | 2016-07-22 | 가부시키가이샤 하모닉 드라이브 시스템즈 | 추월형 맞물림의 음편위 파동 기어 장치 |
| US10174825B2 (en) | 2014-12-09 | 2019-01-08 | Harmonic Drive Systems Inc. | Passing-type-meshing negative-deflection strain wave gearing |
Also Published As
| Publication number | Publication date |
|---|---|
| US20070266819A1 (en) | 2007-11-22 |
| DE112004002907T5 (de) | 2007-05-03 |
| JPWO2005124189A1 (ja) | 2008-04-10 |
| JP4650954B2 (ja) | 2011-03-16 |
| DE112004002907B4 (de) | 2016-02-18 |
| US7735396B2 (en) | 2010-06-15 |
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