CN211975781U - Low return difference planetary gear reducer - Google Patents
Low return difference planetary gear reducer Download PDFInfo
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- CN211975781U CN211975781U CN202020322493.1U CN202020322493U CN211975781U CN 211975781 U CN211975781 U CN 211975781U CN 202020322493 U CN202020322493 U CN 202020322493U CN 211975781 U CN211975781 U CN 211975781U
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Abstract
The utility model discloses a planetary gear reducer with low return difference, which is characterized in that a sun gear (1), a bearing ring A (2), a planet gear (3), a gear ring A (4), a gear ring B (5), a gear ring limiting ring (6) and a bearing ring B (7); the speed reducer has no planet carrier, compact structure and no theoretical return difference.
Description
Technical Field
The utility model relates to a reduction gear, especially a planetary gear reduction gear of low return difference.
Background
Along with the development of aerospace and robot technologies, the requirements on the precision and the structural compactness of the speed reducer are higher and higher, the speed reducer which is widely applied in the field at present comprises a harmonic speed reducer and an RV planetary gear speed reducer, wherein the small-sized low-load speed reducer mainly comprises the harmonic speed reducer, and the speed reducers have theoretical return difference and cannot meet the precision requirement of a high-precision testing instrument.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a planetary gear reducer of low return difference.
A planetary gear reducer with low return difference is characterized by comprising a sun gear, a bearing ring A, a planet gear, a gear ring A, a gear ring B, a gear ring limiting ring and a bearing ring B;
the sun gear is a cylindrical metal piece, the middle part of the sun gear is provided with an outer gear, the two ends of the outer gear are provided with steps matched with the bearing, and one end of the outer gear is provided with a key groove matched with the flat key;
the bearing ring A is a disc-shaped metal piece, one end of the bearing ring A is provided with 4 stages of steps which sink in sequence from outside to inside, the center of the bearing ring A is provided with a through hole, and the other end of the bearing ring A is provided with threaded holes and flanges which are uniformly distributed along the circumference;
the planet gear is a metal external gear, and the planet gear is a thin-wall flexible body;
the gear ring A is an annular metal piece, the inner side of one end of the gear ring A is provided with a 1-level sunken step, the outer side of the gear ring A is provided with external threads, the other end of the gear ring A is provided with threaded holes uniformly distributed along the circumference, the inner side of the gear ring A is an internal gear, and the outer side of the gear ring A is provided with 3 sections;
the gear ring B is an annular metal piece, the inner side of the gear ring B is an inner gear, the number of teeth of the gear ring B is different from that of the gear ring A, one end of the gear ring B is provided with threaded holes which are uniformly distributed along the circumference, and the outer side of the gear ring B is provided with 3 sections of steps;
the gear ring limiting ring is an annular metal piece, the inner side of the gear ring limiting ring is provided with 2 sections of steps, and one section with a larger diameter is provided with internal threads;
the bearing ring B is a disc-shaped metal piece, one end of the bearing ring B is provided with 4 stages of steps which sink in sequence from outside to inside, and the other end of the bearing ring B is provided with threaded holes and flanges which are uniformly distributed along the circumference;
the gear ring limiting ring is sleeved outside the gear ring B, the gear ring B is fixedly connected with the bearing ring B through a screw, the step of the gear ring B is matched with the step at the threaded hole side of the bearing ring B, the gear ring limiting ring is clamped between the gear ring B and the bearing ring B, the external thread of the gear ring A is screwed into the internal thread of the gear ring limiting ring, the step at one end of the unthreaded hole of the gear ring A is matched with the step at one end of the unthreaded hole of the gear ring B, 3 planet gears which are uniformly distributed along the circumferential direction are simultaneously matched with the outer teeth of the sun gear, the inner teeth of the gear ring A and the inner teeth of the gear ring B, the bearing ring A is fixedly connected with the gear ring A through screws, the step of the bearing ring A is matched with the step at one side of the threaded hole of the gear ring A, the planetary gear is in interference fit with the sun gear, the gear ring A and the gear ring B, although the gears are in interference fit, the planetary gear 3 is a flexible body, so that the gears can still smoothly rotate.
The utility model has the advantages that:
1. the utility model discloses a low return difference's planetary gear reducer, ring gear A and planet wheel, ring gear B and planet wheel, sun gear and planet wheel are interference fit, do not have the theory return difference;
2. the utility model discloses a planetary gear reducer of low return difference does not have the planet carrier structure, therefore the structure more is compact than general planetary gear reducer.
Drawings
FIG. 1 is an external view of a low backlash planetary gear reducer;
FIG. 2 is a cross-sectional view of a low backlash planetary gear reducer;
fig. 3 is a layout diagram of the planet wheels of a low return difference planetary gear reducer.
The specific implementation mode is as follows:
as shown in fig. 1, 2 and 3, the planetary gear reducer with low return difference is characterized by comprising a sun gear 1, a bearing ring a2, planet gears 3, a gear ring a4, a gear ring B5, a gear ring limiting ring 6 and a bearing ring B7;
the sun gear 1 is a columnar metal piece, the middle part of the sun gear is provided with an outer gear, two ends of the outer gear are provided with steps matched with the bearing, and one end of the outer gear is provided with a key groove matched with the flat key;
the bearing ring A2 is a disc-shaped metal piece, one end of the bearing ring A2 is provided with 4 stages of steps which sink in sequence from outside to inside, the center of the bearing ring A is provided with a through hole, and the other end of the bearing ring A2 is provided with threaded holes and flanges which are uniformly distributed along the circumference;
the planet wheel 3 is a metal external gear, and the planet wheel 3 is a thin-wall flexible body;
the gear ring A4 is an annular metal piece, the inner side of one end of the gear ring A4 is provided with a 1-level sunken step, the outer side of the gear ring A4 is provided with external threads, the other end of the gear ring A4 is provided with threaded holes uniformly distributed along the circumference, the inner side of the gear ring A4 is an internal gear, and the outer side of the;
the gear ring B5 is an annular metal piece, the inner side of the gear ring B5 is an internal gear, the number of teeth of the gear ring B5 is different from that of the gear ring A4, one end of the gear ring B5 is provided with threaded holes which are uniformly distributed along the circumference, and the outer side of the gear ring B5 is provided with 3 sections of steps;
the gear ring limiting ring 6 is an annular metal piece, 2 sections of steps are arranged on the inner side of the gear ring limiting ring, and an internal thread is arranged on the section with the larger diameter;
the bearing ring B7 is a disc-shaped metal piece, one end of the bearing ring B7 is provided with 4 stages of steps which sink in sequence from outside to inside, and the other end of the bearing ring B7 is provided with threaded holes and flanges which are uniformly distributed along the circumference;
the gear ring limiting ring 6 is sleeved on the outer side of the gear ring B5, the gear ring B5 is fixedly connected with the bearing ring B7 through screws, the step of the gear ring B5 is matched with the step on the threaded hole side of the bearing ring B7, the gear ring limiting ring 6 is clamped between the gear ring B5 and the bearing ring B7, the external thread of the gear ring A4 is screwed into the internal thread of the gear ring limiting ring 6, the step on the non-threaded hole side of the gear ring A4 is matched with the step on the non-threaded hole side of the gear ring B5, 3 planetary wheels 3 uniformly distributed in the circumferential direction are simultaneously matched with the external teeth of the sun wheel 1, the internal teeth of the gear ring A4 and the internal teeth of the gear ring B5, the bearing ring A2 is fixedly connected with the gear ring A4 through screws, the step of the bearing ring A2 is matched with the step on the threaded hole side of the.
The working process is as follows:
bearing ring A2 and bearing ring B7 are respectively fixedly connected with the upper stage and the lower stage of the speed reducing mechanism through screws, for convenience of discussion, the situation that the bearing ring A2 is fixed and the number of teeth of gear ring B5 is larger than that of gear ring A4 is not considered, at this time, gear ring A4 fixedly connected with bearing ring A2 is fixed and fixed, and sun gear 1 is an input shaft, as shown in FIG. 3, when the sun gear rotates clockwise, 3 planet gears engaged with the sun gear roll clockwise while rotating anticlockwise, because gear ring B5 has more teeth than that of gear ring A4, gear ring B5 rotates clockwise, and bearing ring B7 fixedly connected with gear ring B5 rotates clockwise, although the gears are in interference fit, because planet gears 3 are flexible, the gears can still rotate smoothly.
Claims (4)
1. A planetary gear reducer with low return difference is characterized in that a sun gear (1), a bearing ring A (2), a planet gear (3), a gear ring A (4), a gear ring B (5), a gear ring limiting ring (6) and a bearing ring B (7) are arranged;
the sun gear (1) is a cylindrical metal piece, an outer gear is arranged in the middle of the sun gear, steps matched with the bearing are arranged at two ends of the outer gear, and a key groove matched with the flat key is arranged at one end of the outer gear;
the bearing ring A (2) is a disc-shaped metal piece, 4 stages of steps which sink in sequence are arranged at one end from outside to inside, a through hole is formed in the center of the bearing ring A, and threaded holes and flanges which are uniformly distributed along the circumference are formed in the other end of the bearing ring A;
the planet wheel (3) is a metal external gear, and the planet wheel (3) is a thin-wall flexible body;
the gear ring A (4) is an annular metal piece, the inner side of one end of the gear ring A is provided with a 1-level sunken step, the outer side of the gear ring A is provided with external threads, the other end of the gear ring A is provided with threaded holes uniformly distributed along the circumference, the inner side of the gear ring A is an internal gear, and the outer side of the gear ring A is provided with 3 sections;
the gear ring B (5) is an annular metal piece, the inner side of the gear ring B is an inner gear, the number of teeth of the gear ring B (5) is different from that of the gear ring A (4), one end of the gear ring B is provided with threaded holes which are uniformly distributed along the circumference, and the outer side of the gear ring B is provided with 3 sections of steps;
the gear ring limiting ring (6) is an annular metal piece, the inner side of the gear ring limiting ring is provided with 2 sections of steps, and the section with the larger diameter is provided with internal threads;
the bearing ring B (7) is a disc-shaped metal piece, one end of the bearing ring B is provided with 4 stages of steps which sink in sequence from outside to inside, and the other end of the bearing ring B is provided with threaded holes and flanges which are uniformly distributed along the circumference;
the gear ring limiting ring (6) is sleeved outside the gear ring B (5), the gear ring B (5) is fixedly connected with the bearing ring B (7) through screws, the step of the gear ring B (5) is matched with the step at the threaded hole side of the bearing ring B (7), the gear ring limiting ring (6) is clamped between the gear ring B (5) and the bearing ring B (7), the external thread of the gear ring A (4) is screwed into the internal thread of the gear ring limiting ring (6), the step of ring gear A (4) unthreaded hole one end cooperatees with the step of ring gear B (5) unthreaded hole one end, 3 planet wheel (3) along circumferencial direction evenly distributed cooperate with the external tooth of sun gear (1), the internal tooth of ring gear A (4), the internal tooth of ring gear B (5) simultaneously, bearing ring A (2) passes through the screw rigid coupling with ring gear A (4), the step of bearing ring A (2) and the step cooperation of ring gear A (4) threaded hole one side.
2. A low-backlash planetary gear reducer as claimed in claim 1, wherein there is no planet carrier structure.
3. A planetary gear reducer with low return difference according to claim 1, characterized in that the planet wheels (3) are thin-walled flexible bodies, and the engagement between the planet wheels (3) and the sun wheel (1) is an interference fit.
4. A planetary gear reducer with low return difference according to claim 1, characterized in that the planet wheels (3) are thin-walled flexible bodies, and the cooperation of the planet wheels (3) with the ring gear a (4) and the ring gear B (5) is interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020322493.1U CN211975781U (en) | 2020-03-16 | 2020-03-16 | Low return difference planetary gear reducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020322493.1U CN211975781U (en) | 2020-03-16 | 2020-03-16 | Low return difference planetary gear reducer |
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| Publication Number | Publication Date |
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| CN211975781U true CN211975781U (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020322493.1U Active CN211975781U (en) | 2020-03-16 | 2020-03-16 | Low return difference planetary gear reducer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111173893A (en) * | 2020-03-16 | 2020-05-19 | 北京微分航宇科技有限公司 | A planetary gear reducer with low backlash |
-
2020
- 2020-03-16 CN CN202020322493.1U patent/CN211975781U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111173893A (en) * | 2020-03-16 | 2020-05-19 | 北京微分航宇科技有限公司 | A planetary gear reducer with low backlash |
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