CN110939713A - Shape-modifying gear and harmonic reducer - Google Patents
Shape-modifying gear and harmonic reducer Download PDFInfo
- Publication number
- CN110939713A CN110939713A CN201911365997.XA CN201911365997A CN110939713A CN 110939713 A CN110939713 A CN 110939713A CN 201911365997 A CN201911365997 A CN 201911365997A CN 110939713 A CN110939713 A CN 110939713A
- Authority
- CN
- China
- Prior art keywords
- tooth
- gear
- teeth
- cylinder
- modified gear
- 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.)
- Pending
Links
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 13
- 230000007423 decrease Effects 0.000 claims description 3
- 230000004048 modification Effects 0.000 abstract description 7
- 238000012986 modification Methods 0.000 abstract description 7
- 238000005299 abrasion Methods 0.000 abstract description 3
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
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
- F16H55/17—Toothed wheels
-
- 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
Abstract
The invention relates to a shape modification gear, which comprises a cylinder body, wherein the cylinder body is provided with an opening end and a closing end; the outside of open end is equipped with a plurality of outside teeth along the circumference, follows the open end to the direction of closed end, every outside tooth has first tooth section and second tooth section, and the distance of the axis of the top of second tooth section apart from the barrel reduces gradually. The invention also relates to a harmonic reducer, which comprises the shape-modifying gear, wherein the shape-modifying gear is arranged in the inner cavity, and external teeth are meshed with the internal teeth; the rigid wheel is provided with an inner cavity, and the cavity wall of the inner cavity is provided with inner teeth; the wave generator is connected in the cylinder. The invention can increase the contact length of the tooth surface of the inner tooth of the rigid gear, thereby dispersing the acting force born by the tooth surface, and achieving the purposes of reducing the tooth surface abrasion, improving the running stability and reducing the running noise.
Description
Technical Field
The invention relates to the field of harmonic reducers, in particular to a shape modification gear and a harmonic reducer.
Background
In the harmonic gear reducer, the tooth shapes of a flexible gear and a rigid gear directly influence the performance such as the precision service life of the harmonic reducer. In the related art, the tooth profiles of the flexible gear and the rigid gear are straight tooth involute type or double circular arc type, and both the tooth profile of the flexible gear and the tooth profile of the rigid gear are uniform-section tooth profiles, as shown in fig. 1 and 2. After the wave generator is installed in the interior of one end (for example, the right end in fig. 1) of the flexible gear, the right end is expanded and deformed due to the abutting of the wave generator, and the farther away from the right end, the smaller the deformation of the flexible gear is, namely, the flexible gear is integrally of a conical structure with the small left end and the large right end, so that the farther away from the right end is caused, the smaller the meshing area of the flexible gear and the teeth on the steel gear is, part of the teeth can bear larger acting force due to the meshing mode, the teeth are easily abraded, in addition, the insufficient meshing area can also influence the running stability, and the noise in running is increased.
Disclosure of Invention
The present invention solves at least one of the technical problems of the related art to some extent. To this end, it is an object of an embodiment of the present invention to provide a modified gear capable of increasing the tooth surface contact area of a rigid gear and a flexible gear.
The technical scheme adopted by the embodiment of the invention is as follows:
in a first aspect, a modified gear is provided, comprising a barrel having an open end and a closed end; the outside of open end is equipped with a plurality of outside teeth along the circumference, along the direction of open end to closed end, every outside tooth has first tooth section and second tooth section, and the distance of the axis of the top of second tooth section apart from the barrel reduces gradually.
The invention has the beneficial effects that:
the shape-modifying gear can increase the contact length of the tooth surface of the internal tooth of the rigid gear, so that the acting force borne by the tooth surface can be dispersed, and the purposes of reducing the tooth surface abrasion, improving the running stability and reducing the running noise are achieved.
In some embodiments of the invention, the distance of the tip of the first tooth segment from the central axis is kept constant.
In some embodiments of the invention, the barrel is a cylindrical barrel, and the distance from the top of the second tooth segment to the inner side wall of the barrel gradually decreases in the direction from the open end to the closed end.
In some embodiments of the invention, the tooth height of the first tooth segment remains constant.
In some embodiments of the invention, the profile line of the tip of the second tooth segment includes an angle α with respect to the central axis that is 0.01 to 0.05 times the magnitude of the pressure angle of the tooth form.
In some embodiments of the invention, the length of the second tooth segment is 0.2 to 0.4 times the length of the outer tooth.
In a second aspect, the invention further provides a harmonic reducer, which comprises the modified gear, wherein the modified gear is arranged in the inner cavity, and external teeth are meshed with the internal teeth; the rigid wheel is provided with an inner cavity, and the cavity wall of the inner cavity is provided with inner teeth; the wave generator is connected in the cylinder.
Drawings
Fig. 1 is a sectional view of a flexspline in the related art.
Fig. 2 is an enlarged view of the region I in fig. 1.
Fig. 3 is a cross-sectional view of one embodiment of the present invention.
Fig. 4 is an enlarged view of region II in fig. 3.
FIG. 5 is a schematic view of an embodiment of the present invention in use engaged.
Fig. 6 is an enlarged view of the region III in fig. 5.
Detailed Description
This section will describe in detail embodiments of the present invention, which are illustrated in the accompanying drawings, the purpose of which is to supplement the description of the text of the description with figures so that each technical feature and the whole technical solution of the embodiments of the present invention can be intuitively and visually understood, but it should not be construed as limiting the scope of the present invention.
In the description of the present invention, if an orientation description is referred to, for example, the orientations or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. If a feature is referred to as being "disposed," "secured," or "connected" to another feature, it can be directly disposed, secured, or connected to the other feature or be indirectly disposed, secured, or connected to the other feature.
In the description of the embodiments of the present invention, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
In addition, unless defined otherwise, technical and scientific terms used in the embodiments of the present invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 3, a schematic cross-sectional view of one embodiment of the present invention is shown. In this embodiment, the barrel 1 of the modified gear is cup-shaped, and in other embodiments, the barrel 1 of the modified gear is top-hat-shaped. Wherein one end (e.g., the right end in fig. 3) of the barrel 1 is an open end 10 and the other end (e.g., the left end in fig. 3) is a closed end 20, the term "closed end 20" herein refers to being closed relative to the fully open end 10 and does not mean that the closed end 20 is fully closed, e.g., the closed end 20 in fig. 3 may have a through hole.
Referring to fig. 4, the outer side of the open end 10 of the barrel 1 is circumferentially provided with a plurality of external teeth 2, and each external tooth 2 has a first tooth section 21 and a second tooth section 22 in a direction from the closed end 20 to the open end 10 (for example, from left to right in fig. 3), and the distance from the top of the first tooth section 21 to the central axis of the barrel 1 is kept constant, and the distance from the top of the second tooth section 22 to the central axis of the barrel 1 is gradually reduced and is in a downward slope shape towards the open end. Specifically, in this embodiment, the manner in which the distance of the top of the second tooth section 22 from the central axis of the cylinder 1 gradually decreases is implemented as follows: so that the distance from the top of the second tooth segment 22 to the inner side wall of the cylinder 1 is gradually reduced.
In some embodiments of the present invention, the wall thickness of the cylinder 1 in the range of the second tooth section 22 is also gradually reduced in this embodiment, that is, the outer contour of the cylinder 1 in the range of the second tooth section 22 is conical to ensure that the tooth height of the second tooth section 22 is constant, and to avoid weakening the strength of the second tooth section 22.
In some embodiments of the present invention, the profile line of the top of the second tooth section 22 includes an angle α with respect to the central axis that is 0.01 to 0.05 times the pressure angle of the tooth form.
In some embodiments of the invention, the length of the second tooth section 22 is 0.2 to 0.4 times the length of the outer tooth 2.
In some embodiments of the invention, a harmonic reducer using the modified gear as a flexible gear is also disclosed, and the harmonic reducer further comprises a wave generator 3 and a rigid gear 4; in the embodiment, the modification gear is arranged in an inner cavity of the rigid wheel 4, inner teeth are arranged on the inner cavity, external teeth 2 on the modification gear can be meshed with the inner teeth of the rigid wheel 4, and a wave generator 3 is arranged in the inner cavity of the modification gear.
In the embodiment, the modified gear is used as a flexible gear of the harmonic reducer, and the inclined second gear section 22 can inhibit the flexible gear from deforming after the wave generator is installed in the flexible gear, so that the contact length of the external teeth 2 of the flexible gear and the tooth surfaces of the internal teeth of the rigid gear can be increased, the stress of the installation position of the wave generator of the flexible gear can be reduced, the starting torque of the harmonic reducer is reduced, and the transmission efficiency is improved; in addition, referring to fig. 5 and 6, since the area of the meshing area is increased, the present embodiment can also disperse the acting force borne by the tooth surface, thereby reducing the abrasion of the tooth surface, improving the running stability, and reducing the running noise.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope of the present invention defined by the claims. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (7)
1. A modified gear comprising a barrel having an open end and a closed end; the outer side of the opening end is circumferentially provided with a plurality of external teeth, each external tooth is provided with a first tooth section and a second tooth section along the direction from the opening end to the closing end, and the distance from the top of the second tooth section to the central axis of the cylinder body is gradually reduced.
2. The modified gear of claim 1, wherein a distance of a top of the first tooth segment from the central axis remains constant.
3. The modified gear of claim 1, wherein the cylinder is a cylindrical cylinder, and the distance from the top of the second tooth segment to the inner side wall of the cylinder gradually decreases in the direction from the open end to the closed end.
4. The modified gear of claim 3, wherein the tooth height of the second tooth segment remains constant.
5. The modified gear of claim 1, wherein the contour of the top of the second tooth segment includes an angle α with respect to the central axis that is 0.01-0.05 times the pressure angle of the tooth form.
6. The modified gear of claim 1, wherein the length of the second tooth segment is 0.2 to 0.4 times the length of the outer tooth.
7. A harmonic reducer is characterized by comprising
The rigid wheel is provided with an inner cavity, and inner teeth are arranged on the cavity wall of the inner cavity;
the modified gear of any one of claims 1 to 6, disposed in the internal cavity, the external teeth meshing with the internal teeth;
the wave generator is connected in the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911365997.XA CN110939713A (en) | 2019-12-26 | 2019-12-26 | Shape-modifying gear and harmonic reducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911365997.XA CN110939713A (en) | 2019-12-26 | 2019-12-26 | Shape-modifying gear and harmonic reducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110939713A true CN110939713A (en) | 2020-03-31 |
Family
ID=69913563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911365997.XA Pending CN110939713A (en) | 2019-12-26 | 2019-12-26 | Shape-modifying gear and harmonic reducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110939713A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2481905Y (en) * | 2001-02-16 | 2002-03-13 | 北京中技克美谐波传动有限责任公司 | Harmonic drive unit with cup flexible wheel |
| US6467375B1 (en) * | 1999-11-22 | 2002-10-22 | Harmonic Drive Systems, Inc. | Flexible meshing type gear device having deflection meshing involute tooth profile |
| CN205806389U (en) * | 2016-01-26 | 2016-12-14 | 东莞市鑫拓智能机械科技有限公司 | The flexbile gear with the arch gear teeth a kind of of harmonic speed reducer |
| CN108061144A (en) * | 2018-02-05 | 2018-05-22 | 深圳市山卓谐波传动科技有限公司 | A kind of flexbile gear of harmonic gear reducer |
| CN108895146A (en) * | 2018-09-12 | 2018-11-27 | 浙江大学昆山创新中心 | A kind of teeth portion structure of flexbile gear |
| CN109695694A (en) * | 2018-12-10 | 2019-04-30 | 广州市昊志机电股份有限公司 | The correction method and harmonic speed reducer of involute harmonic gear |
| CN209067795U (en) * | 2018-11-09 | 2019-07-05 | 北京中技克美谐波传动股份有限公司 | Flexbile gear and harmonic speed reducer |
| CN211599462U (en) * | 2019-12-26 | 2020-09-29 | 深圳市山卓谐波传动科技有限公司 | Shape-modifying gear and harmonic reducer |
-
2019
- 2019-12-26 CN CN201911365997.XA patent/CN110939713A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6467375B1 (en) * | 1999-11-22 | 2002-10-22 | Harmonic Drive Systems, Inc. | Flexible meshing type gear device having deflection meshing involute tooth profile |
| CN2481905Y (en) * | 2001-02-16 | 2002-03-13 | 北京中技克美谐波传动有限责任公司 | Harmonic drive unit with cup flexible wheel |
| CN205806389U (en) * | 2016-01-26 | 2016-12-14 | 东莞市鑫拓智能机械科技有限公司 | The flexbile gear with the arch gear teeth a kind of of harmonic speed reducer |
| CN108061144A (en) * | 2018-02-05 | 2018-05-22 | 深圳市山卓谐波传动科技有限公司 | A kind of flexbile gear of harmonic gear reducer |
| CN108895146A (en) * | 2018-09-12 | 2018-11-27 | 浙江大学昆山创新中心 | A kind of teeth portion structure of flexbile gear |
| CN209067795U (en) * | 2018-11-09 | 2019-07-05 | 北京中技克美谐波传动股份有限公司 | Flexbile gear and harmonic speed reducer |
| CN109695694A (en) * | 2018-12-10 | 2019-04-30 | 广州市昊志机电股份有限公司 | The correction method and harmonic speed reducer of involute harmonic gear |
| CN211599462U (en) * | 2019-12-26 | 2020-09-29 | 深圳市山卓谐波传动科技有限公司 | Shape-modifying gear and harmonic reducer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2010023710A1 (en) | Harmonic drive gear device having positive shift meshing compound tooth profile | |
| CN108350990B (en) | Flexible externally toothed gear and wave gear device | |
| US9057421B2 (en) | Wave gear device having three-dimensional contacting involute positive deflection tooth profile | |
| CN107795662B (en) | Rigid wheel for harmonic reducer, harmonic reducer and robot | |
| TWI431202B (en) | Thread forming screw thread and corresponding thread roll die | |
| US9476494B2 (en) | Flexible externally toothed gear for wave gear device | |
| US8215205B2 (en) | Wave gear device | |
| US9903459B2 (en) | Strain wave gearing having continuous-contact tooth profile formed using arcuate tooth profile | |
| TWI614428B (en) | Dual type strain wave gearing | |
| US20140345406A1 (en) | Strain wave gearing with involute positive deflection tooth profile taking rim thickness into consideration | |
| US8047092B2 (en) | Spiral bevel gear and gear device | |
| TWI620883B (en) | Dual type strain wave gearing | |
| JP2005036937A (en) | Harmonic drive gearing | |
| CN109983251B (en) | External gear of wave gear device | |
| CN211599462U (en) | Shape-modifying gear and harmonic reducer | |
| KR100360925B1 (en) | Flexible meshing type gear device with a passing tooth profile | |
| JP6218693B2 (en) | Dual type wave gear device | |
| KR102225559B1 (en) | Wave gear device with three-dimensional meshing teeth | |
| US10174825B2 (en) | Passing-type-meshing negative-deflection strain wave gearing | |
| TW201910666A (en) | Harmonic gear unit | |
| EP4234980A1 (en) | Flexible wheel and harmonic reducer comprising same | |
| CN110939713A (en) | Shape-modifying gear and harmonic reducer | |
| US20230193979A1 (en) | Planetary wheel for a planetary gear and planetary carrier for such a planetary wheel | |
| CN209278451U (en) | A kind of cosine tooth profile arcuate tooth trace cylindrical gear transmission | |
| CN217736203U (en) | Flexible gear, harmonic speed reducer and industrial robot |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |