Planet wheel set transmission structure based on lever principle

Abstract

The utility model relates to the technical field of precision transmission devices, in particular to a planet wheel set transmission structure based on the lever principle. Comprising an input end, an output end and a transmission end, the input end is installed at the top end of the fixed shell and comprises a sun gear, and the sun gear is rotationally connected with the fixed shell; the transmission end is installed in the fixed shell and used for transmitting power of the input end to the output end. The transmission end comprises a plurality of transmission shafts, the transmission shafts are evenly distributed in the fixed shell and located on the outer side of the bottom end of the sun gear, first gears are fixed to the outer sides of the top ends of the transmission shafts, second gears are fixed to the outer sides of the bottom ends of the transmission shafts, and the first gears are meshed with the fixed shell. According to the planet wheel set transmission structure based on the lever principle, through cooperation of the fixed shell, the output shaft and the transmission shaft, power driving the sun wheel can be output by the output shaft through transmission of the check ring, and therefore more accurate transmission capacity can be provided in the using process.

Description

Technical Field

[0001] This utility model relates to the field of precision transmission device technology, and in particular to a planetary gear transmission structure based on the lever principle. Background Technology

[0002] Currently, reducers used in industrial automation production lines, robot manufacturing, and aerospace have many problems. While planetary reducers and gear reducers have high efficiency, their reduction ratios are small, often requiring multiple stages to achieve the desired ratio, resulting in large backlashes and affecting transmission accuracy. Harmonic reducers, although having relatively large reduction ratios, are difficult to manufacture, their flexible wheels are prone to aging, and their efficiency is low. Worm gear reducers, while capable of achieving large reduction ratios, suffer from very low efficiency. These shortcomings limit the improvement of equipment performance in related fields and cannot meet the ever-increasing demands for high precision and high efficiency.

[0003] As the repeatability of industrial robots improves to ±0.01mm, medical surgical robots require a reduction in the size of their transmission systems by more than 40%, necessitating the development of new transmission devices that combine high reduction ratios, low vibration, and compact structures.

[0004] To address this issue, a planetary gear transmission structure based on the lever principle was designed to provide an alternative technical solution. Utility Model Content

[0005] Therefore, it is necessary to provide a planetary gear transmission structure based on the lever principle to address the aforementioned technical problems.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] The planetary gear transmission structure based on the lever principle includes an input end, an output end, and a transmission end. The input end is used to transmit power and drive the output end to rotate through the transmission end.

[0008] The input end is mounted on the top of the fixed housing and is used to transmit power to the transmission end;

[0009] The input terminal includes a sun gear, which is rotatably connected to the fixed housing;

[0010] The transmission end is installed inside the fixed housing and is used to transmit the power from the input end to the output end;

[0011] The transmission end includes multiple transmission shafts. The transmission shafts are evenly distributed inside the fixed housing and on the outer side of the bottom end of the sun gear. A first gear is fixed on the outer side of the top end of the transmission shaft, and a second gear is fixed on the outer side of the bottom end of the transmission shaft. The first gear is meshed with the fixed housing.

[0012] The output end includes an output shaft and an output ring. The output shaft is fixed to the bottom of the output ring, and a first internal gear ring is fixed to the inner side of the output ring. The inner side of the first internal gear ring meshes with a second gear.

[0013] As a preferred embodiment of the planetary gear transmission structure based on the lever principle provided by this utility model, the first gear and the second gear are rigidly connected to form a lever arm, the first gear and the first internal gear ring are meshed and connected as a fulcrum, and the second gear and the second internal gear ring are meshed and output power.

[0014] As a preferred embodiment of the planetary gear transmission structure based on the lever principle provided by this utility model, a protrusion is fixed on the outer side of the top of the fixed housing, and an installation hole is opened inside the fixed housing at a position corresponding to the protrusion.

[0015] As a preferred embodiment of the planetary gear transmission structure based on the lever principle provided by this utility model, a first annular groove is provided inside the top of the fixed housing, and a second retaining ring is snapped into the inner side of the first annular groove.

[0016] As a preferred embodiment of the planetary gear transmission structure based on the lever principle provided by this utility model, the interior of the fixed shell is provided with a cavity and an assembly cavity from top to bottom. The top of the assembly cavity is fixed with a second internal gear ring, which meshes with the first gear.

[0017] In a preferred embodiment of the planetary gear transmission structure based on the lever principle provided by this utility model, the diameter of the cavity is smaller than the diameter of the assembly cavity, and the inner diameter of the second internal gear ring is larger than the outer diameter of the cavity.

[0018] As a preferred embodiment of the planetary gear transmission structure based on the lever principle provided by this utility model, a retaining ring is slidably connected inside the fixed housing and at the bottom end of the cavity.

[0019] As a preferred embodiment of the planetary gear transmission structure based on the lever principle provided by this utility model, a limiting ring is slidably connected inside the assembly cavity and at the bottom end of the second internal gear ring.

[0020] As a preferred embodiment of the planetary gear transmission structure based on the lever principle provided by this utility model, a second annular groove is provided at the bottom of the interior of the fixed housing, and a first retaining ring is snapped into the interior of the second annular groove.

[0021] It is clear without a doubt that the technical solution described above in this application can solve the technical problem that this application aims to address.

[0022] At the same time, through the above technical solutions, this utility model has at least the following beneficial effects:

[0023] The planetary gear transmission structure based on the lever principle provided by this utility model, through the cooperation of the fixed housing, output shaft and transmission shaft, enables the power driving the sun gear to be output through the retaining ring, thereby providing more precise transmission capability during use;

[0024] By using the retaining ring and the limiting ring together, the drive shaft can be limited inside the fixed housing by the retaining ring, while the drive shaft can drive the output ring to rotate stably when rotating. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of the fixed outer shell of this utility model;

[0028] Figure 3 This is an exploded view of the present invention;

[0029] Figure 4 This utility model Figure 3 Side view;

[0030] Figure 5 This is a schematic diagram of the internal structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the internal structure of the assembly cavity of this utility model.

[0032] In the diagram: 1. Fixed housing; 2. Sun gear; 3. Mounting hole; 4. Output shaft; 5. Protrusion; 6. Retaining ring; 7. Drive shaft; 8. Output ring; 9. Limiting ring; 10. First internal gear ring; 11. First retaining ring; 12. Second retaining ring; 13. First annular groove; 14. Cavity; 15. Second internal gear ring; 16. Assembly cavity; 17. Second annular groove. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be 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 utility model and are not intended to limit the present utility model.

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0035] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] Example 1

[0038] Reference Figures 1-5 The planetary gear transmission structure based on the lever principle includes an input end, an output end, and a transmission end. The input end is used to transmit power and drive the output end to rotate through the transmission end, thereby transmitting power and driving other objects to rotate through the output end.

[0039] The input end is installed at the top of the fixed housing 1 and is used to transmit power to the transmission end;

[0040] The input end includes a sun gear 2, which is rotatably connected to the fixed housing 1, allowing the sun gear 2 to rotate inside the fixed housing 1;

[0041] The transmission end is installed inside the fixed housing 1 and is used to transmit the power from the input end to the output end;

[0042] Preferably, a protrusion 5 is fixed on the outer side of the top of the fixed housing 1, so that the connection between the external object and the protrusion 5 can form the fixed housing 1 for positioning. An installation hole 3 is provided inside the fixed housing 1 at the position corresponding to the protrusion 5, so that the fixed housing 1 can be fixed to the external object through the cooperation of the installation hole 3 and the bolt.

[0043] The transmission end includes multiple transmission shafts 7. The transmission shafts 7 are evenly distributed inside the fixed housing 1 and on the outer side of the bottom end of the sun gear 2. A first gear is fixed on the outer side of the top end of the transmission shaft 7, and a second gear is fixed on the outer side of the bottom end of the transmission shaft 7. The first gear meshes with the fixed housing 1, so that the rotation of the fixed housing 1 can drive the multiple transmission shafts 7 meshed on the outer side to rotate.

[0044] Preferably, the number of drive shafts 7 is three, but it can also be set to more than one as needed.

[0045] The output end includes an output shaft 4 and an output ring 8. The output shaft 4 is fixed to the bottom of the output ring 8, and a first internal gear ring 10 is fixed to the inner side of the output ring 8. The inner side of the first internal gear ring 10 meshes with a second gear, so that the rotation of the transmission shaft 7 drives the output ring 8 to rotate through the first internal gear ring 10, which in turn drives the output shaft 4 to rotate, thereby allowing the output shaft 4 to drive other externally connected objects to rotate, thus realizing power transmission.

[0046] Preferably, the first gear and the second gear are rigidly connected to form a lever arm, the first gear and the first internal gear ring 10 are meshed together as a fulcrum, and the second gear and the second internal gear ring 15 are meshed together to output power;

[0047] The top of the fixed housing 1 has a first annular groove 13. The inner side of the first annular groove 13 is connected to a second retaining ring 12, so that after the sun gear 2 enters from the top of the fixed housing 1, the second retaining ring 12 located inside the first annular groove 13 positions the sun gear 2 inside the fixed housing 1. The fixed housing 1 has a cavity 14 and an assembly cavity 16 sequentially formed from top to bottom. The diameter of the cavity 14 is smaller than the diameter of the assembly cavity 16. The top of the assembly cavity 16 is fixed with a second internal gear ring 15. The second internal gear ring 15 meshes with the first gear, so that the first gear can rotate stably between the bottom of the sun gear 2 and the second internal gear ring 15, and the inner diameter of the second internal gear ring 15 is larger than the outer diameter of the cavity 14.

[0048] A retaining ring 6 is slidably connected inside the fixed housing 1 and at the bottom of the cavity 14, so that the position of the transmission shaft 7 can be positioned by the retaining ring 6 located inside the second internal gear ring 15, thereby preventing the meshing connection between the first gear and the second internal gear ring 15 from disengaging. A limiting ring 9 is slidably connected inside the assembly cavity 16 and at the bottom of the second internal gear ring 15, so that the limiting ring 9 can rotate inside the assembly cavity 16 and be positioned by contact with the second internal gear ring 15, thereby positioning the output ring 8 in the assembly cavity 16 by the limiting ring 9. A second annular groove 17 is provided at the bottom of the fixed housing 1, and a first retaining ring 11 is snapped into the inside of the second annular groove 17, so that the second annular groove 17 is located outside the output shaft 4 and limits the position of the output ring 8 in the assembly cavity 16, so that when the first retaining ring 11 is in the second annular groove 17, the output ring 8 cannot be disengaged from the fixed housing 1.

[0049] The use process of the planetary gear transmission structure based on the lever principle provided by this utility model is as follows: In use, external power drives the sun gear 2 to rotate, and the rotation of the sun gear 2 drives the multiple first gears meshing at the bottom to rotate. Under the limitation of the external second internal gear ring 15, the multiple first gears drive the transmission shaft 7 to rotate synchronously. The synchronous rotation of the transmission shaft 7 drives the second gear to rotate, and the rotation of the multiple second gears drives the externally meshing first internal gear ring 10 to rotate. The rotation of the first internal gear ring 10 drives the output shaft 4 to rotate through the output ring 8, thereby enabling the output shaft 4 to drive other objects to rotate.

[0050] Example 2

[0051] Reference Figure 6 Based on the above embodiment one, a power calculation method is disclosed.

[0052] Setting: Sun gear 2 is Za, first gear is Zt1, second gear is Zt2, first internal gear ring 10 is Zb1, second internal gear ring 15 is Zb2, and the first gear Zt1 and the second gear Zt2 are rigidly connected to form a lever arm. The first gear Zt1 meshes with the first internal gear ring 10Zb1 as the fulcrum, and the second gear Zt2 meshes with the second internal gear ring 15Zb2 to output power.

[0053] In this embodiment, the rigid connection between Zt1 and zt2 (zta) adopts an integral molding structure or a high-strength alloy welding process to ensure that the axial distance tolerance between the pivot wheel (Zt1) and the output wheel (Zt2) is ≤0.01mm, and the smaller the axial distance between the zt1 and zt2 gears, the better.

[0054] When the sun gear 2 (Za) rotates, the planetary gear set swings around the meshing point of Zt1 and Zb1 as the instantaneous rotation center, with the front teeth disengaging and the rear teeth taking over, thus achieving a continuous rotation state.

[0055] The reduction ratio satisfies the formula: i=(1+Zb1 / Za)(Zb2*Zt1) / ((Zb2*Zt1)-(Zb1*Zt2)).

[0056] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A planetary gear transmission structure based on the lever principle, characterized in that, It includes an input end, an output end, and a transmission end. The input end is used to transmit power and drive the output end to rotate through the transmission end. The input end is installed on the top of the fixed housing (1) and is used to transmit power to the transmission end; The input end includes a sun gear (2), which is rotatably connected to the fixed housing (1); The transmission end is installed inside the fixed housing (1) and is used to transmit the power from the input end to the output end; The transmission end includes multiple transmission shafts (7). The transmission shafts (7) are evenly distributed inside the fixed housing (1) and on the outer side of the bottom end of the sun gear (2). A first gear is fixed on the outer side of the top end of the transmission shaft (7), and a second gear is fixed on the outer side of the bottom end of the transmission shaft (7). The first gear is meshed with the fixed housing (1). The output end includes an output shaft (4) and an output ring (8). The bottom of the output ring (8) is fixed with the output shaft (4). The inner side of the output ring (8) is fixed with a first internal gear ring (10). The inner side of the first internal gear ring (10) is meshed with a second gear.

2. The planetary gear transmission structure based on the lever principle according to claim 1, characterized in that, The first gear and the second gear are rigidly connected to form a lever arm. The first gear and the first internal gear ring (10) are connected by meshing to serve as a fulcrum. The second gear and the second internal gear ring (15) are connected by meshing to output power.

3. The planetary gear transmission structure based on the lever principle according to claim 1, characterized in that, A protrusion (5) is fixed on the outer side of the top of the fixed housing (1), and an installation hole (3) is provided inside the fixed housing (1) at a position corresponding to the protrusion (5).

4. The planetary gear transmission structure based on the lever principle according to claim 1, characterized in that, The top of the fixed outer shell (1) has a first annular groove (13) inside, and a second retaining ring (12) is snapped into the inner side of the first annular groove (13).

5. The planetary gear transmission structure based on the lever principle according to claim 1, characterized in that, The fixed outer shell (1) has a cavity (14) and an assembly cavity (16) arranged sequentially from top to bottom. The top of the assembly cavity (16) is fixed with a second internal gear ring (15), which meshes with the first gear.

6. The planetary gear transmission structure based on the lever principle according to claim 5, characterized in that, The diameter of the cavity (14) is smaller than the diameter of the assembly cavity (16), and the inner diameter of the second internal gear ring (15) is larger than the outer diameter of the cavity (14).

7. The planetary gear transmission structure based on the lever principle according to claim 5, characterized in that, A retaining ring (6) is slidably connected inside the fixed outer shell (1) and at the bottom of the cavity (14).

8. The planetary gear transmission structure based on the lever principle according to claim 5, characterized in that, The assembly cavity (16) is slidably connected to the bottom end of the second internal gear ring (15) by a limiting ring (9).

9. The planetary gear transmission structure based on the lever principle according to claim 1, characterized in that, The bottom of the fixed outer shell (1) is provided with a second annular groove (17), and a first retaining ring (11) is snapped into the inside of the second annular groove (17).

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