CN113431876A - Speed reducer with few differential teeth - Google Patents
Speed reducer with few differential teeth Download PDFInfo
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- CN113431876A CN113431876A CN202110723240.4A CN202110723240A CN113431876A CN 113431876 A CN113431876 A CN 113431876A CN 202110723240 A CN202110723240 A CN 202110723240A CN 113431876 A CN113431876 A CN 113431876A
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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
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
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Abstract
The application relates to the technical field of speed reducers, and provides a speed reducer with few differential teeth, which comprises a fixed base body; the outer gear ring is fixed on the fixed base body, and an inner ring of the outer gear ring is provided with a first inner tooth part; the rotary driving piece is rotatably arranged on the fixed base body; the eccentric rotating frame is connected with the rotary driving piece, and the rotation axis of the eccentric rotating frame is parallel to the central axis of the outer gear ring; the transmission rolling ring forms a first ring part and a second ring part, an output tooth part is arranged on the second ring part, the outer side of the eccentric rotating frame is in twisting fit with the inner side of the first ring part, a first outer tooth part is arranged on the outer side of the first ring part, the first outer tooth part and the first inner tooth part are meshed with each other, and the number of teeth of the first outer tooth part is less than that of the first inner tooth part; the output gear ring is meshed with the output tooth part of the second ring part, and the reduction ratio of the single-stage speed reducer is greatly improved, and the volume of the speed reducer is greatly reduced.
Description
Technical Field
The application relates to the technical field of speed reducers, in particular to a speed reducer with few differential teeth.
Background
The speed reducer is an important core part applied to the output end of the motor. The speed reducer applied to the robot mainly comprises an RV speed reducer, a harmonic speed reducer, a planetary speed reducer, a worm and gear speed reducer and a speed reducer mechanism consisting of a synchronous belt. The speed reducer mainly aims to convert the high rotating speed and the small torque of the motor, reduce a certain rotating speed and obtain larger output torque. The traditional speed reducer has high manufacturing difficulty and high manufacturing precision, and is typified by RV speed reducers and harmonic speed reducers; the traditional speed reducer has larger dependence on manufacturing materials, such as flexible gear deformation materials of harmonic speed reducers. Traditional speed reducers have transmission gaps, such as planetary speed reducers. The traditional speed reducing mechanism is complex in design, like a synchronous belt for speed reduction, needs multiple levels of nesting and is relatively large in structural size. The volume design of traditional speed reducer is limited, and RV speed reducer and harmonic speed reducer have the advantage that obtains bigger reduction ratio in principle, however these speed reducers are difficult to accomplish the purpose that single reduction realized big reduction ratio among the prior art.
Disclosure of Invention
The invention mainly aims to provide a speed reducer with few differential teeth, and aims to solve the technical problems that the structure size of the speed reducer is large, and single-stage speed reduction is difficult to realize large reduction ratio in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: a reduction gear with few differential teeth, comprising:
fixing the substrate;
the outer gear ring is fixed on the fixed base body, and an inner ring of the outer gear ring is provided with a first inner tooth part;
a rotary drive rotatably mounted to the stationary base;
the eccentric rotating frame is connected with the rotary driving piece, and the rotation axis of the eccentric rotating frame is parallel to the central axis of the outer gear ring;
the transmission rolling ring sequentially forms a first ring part and a second ring part along the axial direction of the transmission rolling ring, an output tooth part is arranged on the second ring part, the outer side of the eccentric rotating frame is in twisting fit with the inner side of the first ring part, a first outer tooth part is arranged on the outer side of the first ring part, the first outer tooth part and the first inner tooth part are meshed with each other, and the number of teeth of the first outer tooth part is smaller than that of the first inner tooth part, so that when the eccentric rotating frame rotates to twist the first ring part to rotate, the first ring part can roll on the inner ring of the outer gear ring;
an output ring gear meshed with the output teeth of the second ring portion.
Further, the output teeth are second outer teeth provided on an outer side of the second ring portion, and an inner side of the output ring gear has ring inner teeth meshing with the second outer teeth.
Further, the number of teeth of the second outer tooth portion is smaller than that of the ring inner tooth portion.
Further, the output teeth are second inner teeth provided on an inner side of the second ring portion, and an outer side of the output ring gear has ring outer teeth meshing with the second outer teeth.
Further, the number of teeth of the ring outer teeth portion is smaller than that of the second inner teeth portion.
Further, the difference between the number of teeth of the first external tooth system and the number of teeth of the first internal tooth system is less than or equal to 4.
Furthermore, the eccentric rotating frame is of a rotating wheel structure, and the outer circumferential surface of the rotating wheel structure is in twisting fit with the inner side of the first ring portion.
Furthermore, the few-difference-tooth speed reducer is a motor type speed reducer, the fixed base body is a motor shell, the outer gear ring is fixed on a motor stator on the inner side of the motor shell, and the rotary driving piece is a motor rotor.
Further, the reduction gear with less difference teeth comprises a first bearing arranged between the outer side of the eccentric rotating frame and the inner side of the first ring part.
Further, the reduction gear with less differential teeth includes a second bearing provided between an outer side of the output ring gear and an inner side of the fixed base.
The application provides a few poor tooth speed reducer's beneficial effect lies in:
compared with the prior art, in the small-difference gear speed reducer, the small-difference gear transmission matching of the eccentric rotating frame, the transmission rolling ring and the output gear ring is designed, only one planet wheel (the transmission rolling ring plays the role of the planet wheel) is needed, the reduction ratio of a single-stage speed reducer can be improved, and the size of the speed reducer is greatly reduced.
In a further scheme, a second small-difference gear matching is formed between the transmission rolling ring and the output gear ring, two times of small-difference gear transmission is realized in a limited space, the reduction ratio of the single-stage speed reducer is greatly improved, the size of the speed reducer is greatly reduced, and the change of the reduction ratio can be flexibly realized by changing the transmission rolling ring into a second outer tooth part or a second inner tooth part for output.
In addition, the few poor tooth speed reducer of this application has broken through the restraint of traditional speed reducer for the reduction ratio, the size flexibility, the manufacturable type of speed reducer have obtained very big promotion. Is different from the principle of driving a single-stage speed reducer. The core theory is the principle of multiple movements and few difference teeth, and is integrated in the first-stage deceleration. While reducing the dependence on materials and assembly processes.
In a further scheme, on the basis of meeting the structure, the less-differential-tooth speed reducer can form an integrated joint module of the motor and the speed reducer through a structural form arranged in the motor, further simplifies the manufacture of the motor and the speed reducer, and realizes a joint module manufacturing method with a smaller volume.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a cross-sectional view of a reduction gear with few differential teeth provided in an embodiment of the present application;
fig. 2 is an exploded perspective view of a reduction gear with few differential teeth according to a first embodiment of the present application;
fig. 3 is an exploded perspective view of a reduction gear with few differential teeth according to a second embodiment of the present application;
FIG. 4 is an assembly view of a reduction gear box provided in an embodiment of the present application showing a first reduction fit;
FIG. 5 is a partial assembly view of a reduction gear with few differential teeth provided in accordance with a first embodiment of the present application, showing a second few differential teeth fit;
fig. 6 is a partial assembly view of a reduction gear unit with few differential teeth according to a second embodiment of the present application, showing a second few differential teeth fit.
Reference numerals referred to in the above figures are detailed below:
1-fixing a substrate; 2-an eccentric rotating frame; 3-a first bearing; 4-a second bearing; 100-outer gear ring; 101-a first inner tooth; 200-driving rolling rings; 201-a first collar; 202-a second collar; 203-first outer teeth; 204-second outer teeth; 205-second inner teeth; 300-output gear ring; 301-ring inner teeth; 302-turn of external teeth.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In order to explain the technical solutions of the present application, the following detailed descriptions are made with reference to specific drawings and examples.
Referring to fig. 1 to 3, an embodiment of the invention provides a speed reducer with few differential teeth, including: a fixed base 1 (a carrier base or a mounting base as the other component), an outer gear ring 100, a rotary drive (not shown but well understood, hereinafter it is mentioned that the rotary drive may be a motor rotor), an eccentric turret 2, a drive roller ring 200 and an output gear ring 300,
wherein, the outer gear ring 100 is fixed on the fixed base 1, and the inner ring of the outer gear ring 100 is provided with a first inner tooth part 101; the rotary driving piece is rotatably arranged on the fixed base body 1; the eccentric rotating frame 2 is connected with the rotary driving piece, the rotation axis of the eccentric rotating frame 2 is parallel to the central axis of the external gear ring 100, that is, the rotation axis of the eccentric rotating frame 2 is not superposed with the central axis of the external gear ring 100 but spaced, which is equivalent to that the relative position of the eccentric rotating frame 2 and the external gear ring 100 is eccentric; the transmission rolling ring 200 is sequentially provided with a first ring part 201 and a second ring part 202 along the axial direction, an output tooth part is arranged on the second ring part 202, the outer side of the eccentric rotating frame 2 is in twisting fit with the inner side of the first ring part 201, a first outer tooth part 203 is arranged on the outer side of the first ring part 201, the first outer tooth part 203 and the first inner tooth part 101 are meshed with each other, the number of teeth of the first outer tooth part 203 is smaller than that of the first inner tooth part 101, so that when the eccentric rotating frame 2 rotates and the twisting first ring part 201 rotates, the first ring part 201 can roll on the inner ring of the outer gear ring 100; the output ring gear 300 and the output teeth of the second ring portion 202 mesh with each other.
It has been mentioned above that the number of teeth of the first external teeth 203 is smaller than the number of teeth of the first internal teeth 101, i.e. the first small-difference gear fit is formed between the external gear ring 100 and the transmission rolling ring 200, and the second small-difference gear fit is preferably formed between the transmission rolling ring 200 and the output gear ring 300, and there are 2 specific design forms:
referring to fig. 2 and 5, according to the first embodiment of the present invention, the output teeth are second outer teeth 204 disposed outside the second ring portion 202, and the inside of the output ring gear 300 has ring inner teeth 301 meshing with the second outer teeth 204. Preferably, the number of teeth of the second external teeth portion 204 is smaller than that of the ring internal teeth portion 301, at this time, the output teeth portion of the transmission rolling ring 200 is in an external teeth form (the second external teeth portion 204), and the final reduction ratio is a superimposed effect, so that the reduction ratio of the less-differential gear reducer can be multiplied.
Referring to fig. 3 and 6, according to the second embodiment of the present invention, the output teeth are second inner teeth 205 disposed inside the second ring portion 202, and the outside of the output ring gear 300 has a ring outer teeth portion 302 meshed with the second outer teeth 204. Preferably, the number of teeth of the ring outer teeth 302 is smaller than that of the second inner teeth 205, and at this time, when the output teeth of the transmission rolling ring 200 are in an inner teeth form (the second inner teeth 205), the final reduction ratio is the action of subtraction, and the final reduction ratio formed by the less-difference gear reducer is relatively small.
No matter which embodiment is adopted for the transmission rolling ring 200, the manufacturing of the transmission rolling ring 200 provided by the invention is different from the transmission process, and the manufacturing mode of the section bar can be used, so that the manufacturing cost is greatly reduced. The speed reducer with few differential teeth provided by the invention has no flexible part in the manufacturing process, so that the requirement on materials can be reduced, and the cost can be saved.
Referring to fig. 4 to 6, according to an embodiment of the present invention, the difference between the number of teeth of the first outer tooth portion 203 and the number of teeth of the first inner tooth portion 101 is less than or equal to 4, and is usually 2, or 1, or 4, and of course, as other embodiments, even if the difference between the number of teeth of the first outer tooth portion 203 and the number of teeth of the first inner tooth portion 101 is greater than 4, it is still within the protection scope of the present invention, and similarly, the difference between the number of teeth of the first outer tooth portion 203 and the number of teeth of the first inner tooth portion 101 can be designed by referring to the difference between the small difference tooth fit formed between the transmission rolling ring 200 and the output ring 300, for example, the number of teeth of the second outer tooth portion 204 less than the number of teeth of the ring inner tooth portion 301 can also be 1, 2, or 4, and so on, and will not be described herein again.
Referring to fig. 1 to 3, according to an embodiment of the present invention, the eccentric rotary frame 2 has a rotary wheel structure, and an outer circumferential surface of the rotary wheel structure is in a twisting fit with an inner side of the first ring portion 201.
Referring to fig. 1 to 3, according to an embodiment of the present invention, the small-difference-tooth speed reducer is a motor-type speed reducer, the fixed base 1 is a motor housing, the outer gear ring 100 is fixed on a motor stator inside the motor housing, the rotary driving member is a motor rotor, and the motor rotor can drive the eccentric rotating frame 2 to rotate synchronously, of course, as another embodiment, even if the small-difference-tooth speed reducer provided by the present invention is not a motor-type speed reducer (not applied to a motor), as long as the structure is similar to the small-difference-tooth speed reducer provided by the present invention, the application in any type of speed reducer structure will fall within the protection scope of the present invention, the fixed base 1 is not limited to the form of a motor housing, even not limited to the form of a housing, but can also be a fixed base, a supporting frame, and so as to the small-difference-tooth speed reducer provided by the present invention can satisfy the above-mentioned configuration, the integrated joint module of the motor and the speed reducer can be formed through the structural form of the built-in motor, the manufacturing of the motor and the speed reducer is further simplified, and the manufacturing method of the joint module with smaller volume is realized, but the method is not limited to the form of the integrated module formed by the motor and the speed reducer.
Referring to fig. 1 to 3, according to an embodiment of the present invention, the reduction gear comprises a first bearing 3 disposed between an outer side of the eccentric rotating frame 2 and an inner side of the first ring part 201, and the outer side of the eccentric rotating frame 2 rubs the inner side of the first ring part 201 through the first bearing 3, so that the matching between the eccentric rotating frame 2 and the first ring part 201 is smoother, and the reliability and stability of the rubbing matching between the eccentric rotating frame 2 and the first ring part 201 are improved. Of course, similarly, the second bearing 4 may be disposed between the outer side of the output ring gear 300 and the inner side of the fixed base 1, and a bearing may be disposed between other suitable components in the reduction gear with small difference according to the present invention to improve the reliability and stability of the rotational fit.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A reduction gear with few differential teeth, comprising:
fixing the substrate;
the outer gear ring is fixed on the fixed base body, and an inner ring of the outer gear ring is provided with a first inner tooth part;
a rotary drive rotatably mounted to the stationary base;
the eccentric rotating frame is connected with the rotary driving piece, and the rotation axis of the eccentric rotating frame is parallel to the central axis of the outer gear ring;
the transmission rolling ring sequentially forms a first ring part and a second ring part along the axial direction of the transmission rolling ring, an output tooth part is arranged on the second ring part, the outer side of the eccentric rotating frame is in twisting fit with the inner side of the first ring part, a first outer tooth part is arranged on the outer side of the first ring part, the first outer tooth part and the first inner tooth part are meshed with each other, and the number of teeth of the first outer tooth part is smaller than that of the first inner tooth part, so that when the eccentric rotating frame rotates to twist the first ring part to rotate, the first ring part can roll on the inner ring of the outer gear ring;
an output ring gear meshed with the output teeth of the second ring portion.
2. The reduction gear according to claim 1, wherein the output tooth portion is a second outer tooth portion provided on an outer side of the second ring portion, and an inner side of the output ring gear has an inner ring tooth portion meshing with the second outer tooth portion.
3. The reduction gear according to claim 2, wherein the number of teeth of the second outer teeth portion is smaller than the number of teeth of the ring inner teeth portion.
4. The reduction gear according to claim 3, wherein the output tooth portion is a second inner tooth portion provided inside the second ring portion, and an outer tooth portion of the output ring gear meshes with the second outer tooth portion.
5. The reduction gear according to claim 4, wherein the number of teeth of the ring outer teeth portion is smaller than the number of teeth of the second inner teeth portion.
6. A differential reduction gear according to any of claims 1 to 5, wherein the difference between the number of teeth of the first outer teeth and the number of teeth of the first inner teeth is less than or equal to 4.
7. The reduction gear according to any one of claims 1 to 5, wherein the eccentric rotating frame is a rotating wheel structure, and an outer circumferential surface of the rotating wheel structure is in twisting fit with an inner side of the first ring portion.
8. The reduction gear according to any one of claims 1 to 5, wherein the reduction gear is a motor-type reduction gear, the stationary base is a motor housing, the outer ring gear is fixed to a motor stator inside the motor housing, and the rotary drive member is a motor rotor.
9. The reduction gear according to any of claims 1 to 5, comprising a first bearing disposed between an outer side of the eccentric turret and an inner side of the first ring.
10. The reduction gear of claim 9, comprising a second bearing disposed between an outer side of the output ring gear and an inner side of the stationary base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110723240.4A CN113431876A (en) | 2021-06-28 | 2021-06-28 | Speed reducer with few differential teeth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110723240.4A CN113431876A (en) | 2021-06-28 | 2021-06-28 | Speed reducer with few differential teeth |
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| Publication Number | Publication Date |
|---|---|
| CN113431876A true CN113431876A (en) | 2021-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110723240.4A Pending CN113431876A (en) | 2021-06-28 | 2021-06-28 | Speed reducer with few differential teeth |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035818U (en) * | 1988-09-14 | 1989-04-12 | 杨天博 | Very-short-tooth planetary speed reducer |
| CN2491651Y (en) * | 2000-09-27 | 2002-05-15 | 郑悦 | Reverse synchronous reductor set |
| CN101881318A (en) * | 2010-06-23 | 2010-11-10 | 重庆大学 | General reducer with eccentric engagement pairs |
| CN105473891A (en) * | 2013-08-12 | 2016-04-06 | 三宝Motors株式会社 | Reducer |
| CN107237867A (en) * | 2017-07-04 | 2017-10-10 | 东莞市乐宏塑料五金制品有限公司 | A kind of decelerator and method of work |
| CN111536201A (en) * | 2020-06-04 | 2020-08-14 | 三门台力电机有限公司 | Differential gear large reduction ratio speed reducing motor |
-
2021
- 2021-06-28 CN CN202110723240.4A patent/CN113431876A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035818U (en) * | 1988-09-14 | 1989-04-12 | 杨天博 | Very-short-tooth planetary speed reducer |
| CN2491651Y (en) * | 2000-09-27 | 2002-05-15 | 郑悦 | Reverse synchronous reductor set |
| CN101881318A (en) * | 2010-06-23 | 2010-11-10 | 重庆大学 | General reducer with eccentric engagement pairs |
| CN105473891A (en) * | 2013-08-12 | 2016-04-06 | 三宝Motors株式会社 | Reducer |
| CN107237867A (en) * | 2017-07-04 | 2017-10-10 | 东莞市乐宏塑料五金制品有限公司 | A kind of decelerator and method of work |
| CN111536201A (en) * | 2020-06-04 | 2020-08-14 | 三门台力电机有限公司 | Differential gear large reduction ratio speed reducing motor |
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Application publication date: 20210924 |