High-torque output precision planetary reducer

Abstract

The utility model discloses a high torque output precision planetary reducer which comprises a support and an inner gear ring arranged on the support, an output shaft is arranged in the support, a motor is arranged at the end of the inner gear ring, the support is provided with a through cavity, and the cavity comprises a first cavity, a second cavity and a third cavity which are communicated with one another. The output shaft comprises an output shaft body matched with the second cavity and a limiting ring matched with the third cavity, the peripheral face of the output shaft body and the peripheral face of the limiting ring are both connected with the support by arranging teflon linings, and a gasket is arranged on the limiting ring. The speed reducer is simple in structure, the support and the output shaft are connected through the teflon lining, the structural size of the support can be reduced, the manufacturing cost is reduced, the axial end face of the output shaft is prone to abrasion, and therefore the abrasion resistance can be improved, the service life of the output shaft can be prolonged, and it is guaranteed that the size of the speed reducer is small. And the method can adapt to better application scenes with limited space.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, in particular to a high-torque output precision planetary reducer. Background Art

[0002] A reducer, also known as a speed reducer or gear reduction box, is a mechanical device that uses a gear set to reduce the speed of the input shaft while increasing the torque (moment). Reducers are widely used in many fields such as industry, automobiles, aerospace, robotics, and household appliances.

[0003] In the existing reducer design, bearings are usually used to connect the bracket and the output shaft. Although this design ensures the stability and rotation accuracy of the shaft, in application scenarios with limited space, using bearings as connecting parts, especially in order to withstand high loads and maintain accuracy, often requires larger bearings, which directly leads to an increase in the overall size of the reducer. At the same time, the cost of the bearings is relatively high. For this reason, a high-torque output precision planetary reducer is proposed. Utility Model Content

[0004] The utility model aims to provide a high torque output precision planetary reducer to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-torque output precision planetary reducer, comprising a bracket and an inner gear ring arranged on the bracket, an output shaft is arranged in the bracket, a motor is arranged at the end of the inner gear ring, the bracket has a through cavity, the cavity includes a first cavity, a second cavity and a third cavity that are mutually connected; the output shaft includes an output shaft body adapted to the second cavity and a limit ring adapted to the third cavity, the outer circumferential surfaces of the output shaft body and the limit ring are connected to the bracket by setting a polyfluoroethylene bushing, and a gasket is provided on the limit ring, whose function is to limit the shaking of the output shaft body during axial rotation.

[0006] As a further solution of the utility model: the inner gear ring includes a primary inner gear ring and a secondary inner gear ring, the primary inner gear ring and the secondary inner gear ring are connected by fasteners, the primary inner gear ring is connected to the motor, and the secondary inner gear ring is connected to the bracket.

[0007] As a further solution of the utility model: the end portion where the motor is connected to the primary internal gear ring is designed to be stepped, the stepped end portion matches the inner cavity shape of the primary internal gear ring, and a sealing ring is provided at the connection between the motor and the primary internal gear ring.

[0008] As a further solution of the utility model: the motor and the output shaft are connected in transmission via a multi-stage transmission assembly, and the multi-stage transmission assembly is arranged inside the inner gear ring.

[0009] As a further solution of the present utility model: The multi-stage transmission assembly includes a first transmission component and a second transmission component, wherein the first transmission component is configured to be engaged with the motor, and the second transmission component is designed to be connected to the output shaft, and the first transmission component is connected to the second transmission component.

[0010] As a further solution of the present utility model: The first transmission component includes a first-stage bracket. A first-stage planetary gear is fixed to the end face of the first-stage bracket by needle rollers. A plurality of second-stage planetary gears are provided on the first-stage bracket. A second-stage bracket is provided on the end face of the first-stage bracket away from the first-stage planetary gear. A plurality of the second-stage planetary gears are all connected to the second-stage bracket by needle rollers. A plurality of third-stage planetary gears are provided on the second-stage bracket. A third-stage bracket is provided on the end face of the second-stage bracket away from the first-stage bracket. A plurality of the third-stage planetary gears are all connected to the third-stage bracket by needle rollers.

[0011] As a further solution of the present utility model: The second transmission component includes a plurality of fourth-stage planetary gears meshing with the third-stage bracket. A plurality of the fourth-stage planetary gears are all connected to a fourth-stage bracket by needle rollers. A plurality of fifth-stage planetary gears are provided on the fourth-stage bracket. A plurality of the fifth-stage planetary gears are all connected to a fifth-stage bracket by needle rollers. A plurality of sixth-stage planetary gears are provided on the fifth-stage bracket. A plurality of the sixth-stage planetary gears are all connected to the end of the output shaft by needle rollers.

[0012] As a further solution of the present utility model: The first-stage bracket, the second-stage bracket, the third-stage bracket, the fourth-stage bracket and the fifth-stage bracket all include a sun gear, a tray and a flat key, and the sun gear is connected to the tray by the flat key.

[0013] As a further solution of the present utility model: A skeleton oil seal is further provided between the bracket and the output shaft.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] In this application, the connection between the bracket and the output shaft is completed by using a PTFE bushing, which can reduce the structural size of the bracket and reduce the manufacturing cost. The axial end face of the output shaft is prone to wear. Therefore, using a PTFE gasket in combination can increase wear resistance and extend its service life, ensuring that the size of this reducer is small and it can adapt to better application scenarios with limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the reducer of the present utility model;

[0017] Figure 2 It is a schematic diagram of the bracket structure of the present utility model;

[0018] Figure 3 It is a schematic diagram of the output shaft structure of the present utility model;

[0019] Figure 4 Schematic diagram of the connection between the bracket and the internal gear ring of the present utility model;

[0020] Figure 5 Schematic diagram of the multi-stage transmission assembly of the present utility model;

[0021] Figure 6 Schematic diagram of the first transmission component of the present utility model;

[0022] Figure 7 Schematic diagram of the second transmission component of the present utility model;

[0023] Figure 8 Schematic diagram of the structure of the first-level bracket of the present utility model;

[0024] In the figure: 1. Bracket; 1-1. First cavity; 1-2. Second cavity; 1-3. Third cavity; 2. Internal gear ring; 2-1. First-level internal gear ring; 2-2. Second-level internal gear ring; 3. Output shaft; 3-1. Output shaft body; 3-2. Limit ring; 4. Motor; 5. Teflon bushing; 6. Gasket; 7. Multi-stage transmission assembly; 7-1. First transmission component; 7-1-1. First-level bracket; 7-1-2. First-level planetary gear; 7-1-3. Second-level planetary gear; 7-1-4. Second-level bracket; 7-1-5. Third-level planetary gear; 7-1-6. Third-level bracket; 7-2. Second transmission component; 7-2-1. Fourth-level planetary gear; 7-2-2. Fourth-level bracket; 7-2-3. Fifth-level planetary gear; 7-2-4. Fifth-level bracket; 7-2-5. Sixth-level planetary gear; 8. Fastener; 9. Skeleton oil seal. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Please refer to Figure 1-8, in the embodiment of the present utility model, a high-torque output precision planetary reducer includes a bracket 1 and an internal gear ring 2 provided on the bracket 1. An output shaft 3 is provided inside the bracket 1, and a motor 4 is provided at the end of the internal gear ring 2. The bracket 1 has a through cavity, which includes a first cavity 1-1, a second cavity 1-2, and a third cavity 1-3 that communicate with each other; the output shaft 3 includes an output shaft body 3-1 adapted to the second cavity 1-2 and a limiting ring 3-2 adapted to the third cavity 1-3. The outer peripheral surfaces of the output shaft body 3-1 and the limiting ring 3-2 are both connected to the bracket 1 by setting a tetrafluoro bushing 5. A gasket 6 is provided on the limiting ring 3-2, and its function is to limit the shaking generated by the output shaft body 3-1 during axial rotation.

[0027] Specifically, at least one through hole for fixing it at the corresponding position is opened on the bracket 1. The setting of the through hole facilitates the bolt to pass through for fastening. Secondly, the inside of the cavity is adapted to the outer diameter of the output shaft 3. At the same time, the outer diameter of each area of the output shaft 3 corresponds to the first cavity 1-1, the second cavity 1-2, and the third cavity 1-3 respectively, and the connection between the bracket 1 and the output shaft 3 is completed under the action of the tetrafluoro bushing 5 and the gasket 6. On the one hand, it can ensure the stable rotation of the output shaft 3 inside the bracket 1, and on the other hand, it can also reduce the structural size of the bracket 1 and reduce the manufacturing cost. However, the output shaft 3 is prone to shaking during rotation after using the tetrafluoro bushing 5. Therefore, using the gasket 6 in combination can limit the shaking generated by the output shaft body 3-1 during axial rotation.

[0028] Please refer to Figure 1 and Figure 4 , in one embodiment, in this embodiment, preferably, the internal gear ring 2 includes a first-stage internal gear ring 2-1 and a second-stage internal gear ring 2-2. The first-stage internal gear ring 2-1 and the second-stage internal gear ring 2-2 are connected by a fastener 8. The first-stage internal gear ring 2-1 is connected to the motor 4, while the second-stage internal gear ring 2-2 is connected to the bracket 1.

[0029] Specifically, the first-stage internal gear ring 2-1 and the second-stage internal gear ring 2-2 can be connected together by the fastener 8 or it is convenient to disassemble the first-stage internal gear ring 2-1 and the second-stage internal gear ring 2-2. Secondly, due to the setting of the first-stage internal gear ring 2-1 and the second-stage internal gear ring 2-2, the multi-stage transmission assembly 7 can rotate along the tooth walls inside the first-stage internal gear ring 2-1 and the second-stage internal gear ring 2-2 to ensure the stability of the multi-stage transmission assembly 7 when moving inside the internal gear ring 2.

[0030] Please refer to Figure 1 , in one embodiment, in this embodiment, preferably, the end of the motor 4 connected to the first-stage internal gear ring 2-1 is designed to be stepped, and the stepped end matches the inner cavity shape of the first-stage internal gear ring 2-1. A sealing ring is provided at the connection between the motor 4 and the first-stage internal gear ring 2-1, which can further improve the sealing performance of this connection.

[0031] Please refer to Figure 1 and Figure 5 In one embodiment, preferably, the motor 4 and the output shaft 3 are drivingly connected through a multi-stage transmission assembly 7, and the multi-stage transmission assembly 7 is disposed inside the internal gear ring 2; the multi-stage transmission assembly 7 includes a first transmission member 7-1 and a second transmission member 7-2. The first transmission member 7-1 is configured to engage with the motor 4, and the second transmission member 7-2 is designed to be connected to the output shaft 3. The first transmission member 7-1 and the second transmission member 7-2 are connected, and the transmission from the motor 4 to the output shaft 3 can be achieved by combining the first transmission member 7-1 and the second transmission member 7-2, improving the transmission efficiency, which can be increased from the original 30% to 45%.

[0032] Please refer to Figure 6 In one embodiment, preferably, the first transmission member 7-1 includes a first-stage bracket 7-1-1. A first-stage planetary gear 7-1-2 is fixed to the end face of the first-stage bracket 7-1-1 by needle rollers. A plurality of second-stage planetary gears 7-1-3 are provided on the first-stage bracket 7-1-1. A second-stage bracket 7-1-4 is provided on the end face of the first-stage bracket 7-1-1 away from the first-stage planetary gear 7-1-2. A plurality of second-stage planetary gears 7-1-3 are all connected to the second-stage bracket 7-1-4 by needle rollers. A plurality of third-stage planetary gears 7-1-5 are provided on the second-stage bracket 7-1-4. A third-stage bracket 7-1-6 is provided on the end face of the second-stage bracket 7-1-4 away from the first-stage bracket 7-1-1. A plurality of third-stage planetary gears 7-1-5 are all connected to the third-stage bracket 7-1-6 by needle rollers.

[0033] Please refer to Figure 7 In one embodiment, preferably, the second transmission member 7-2 includes a plurality of fourth-stage planetary gears 7-2-1 that mesh with the third-stage bracket 7-1-6. A plurality of fourth-stage planetary gears 7-2-1 are all connected to a fourth-stage bracket 7-2-2 by needle rollers. A plurality of fifth-stage planetary gears 7-2-3 are provided on the fourth-stage bracket 7-2-2. A plurality of fifth-stage planetary gears 7-2-3 are all connected to a fifth-stage bracket 7-2-4 by needle rollers. A plurality of sixth-stage planetary gears 7-2-5 are provided on the fifth-stage bracket 7-2-4. A plurality of sixth-stage planetary gears 7-2-5 are all connected to the end of the output shaft 3 by needle rollers.

[0034] Please refer to Figure 6-8, in one embodiment, preferably, the first-level bracket 7-1-1, the second-level bracket 7-1-4, the third-level bracket 7-1-6, the fourth-level bracket 7-2-2 and the fifth-level bracket 7-2-4 all include a sun gear, a tray and a flat key. The sun gear is connected to the tray through the flat key. Further, the flat key is fixedly connected to the sun gear, and the end of the flat key is designed with a small taper, and the end of the flat key is press-fitted into the interior of the tray with interference, which can prevent the axial loosening of the sun gear and the tray during rotation. Among them, multiple groups of brackets are respectively meshed with different planet gears through their own sun gears.

[0035] Please refer to Figure 1 , in one embodiment, preferably, a skeleton oil seal 9 is further provided between the bracket 1 and the output shaft 3. On the one hand, it can prevent the lubricating oil between the bracket 1 and the output shaft 3 from leaking from the gap, and on the other hand, it can prevent dust, water, sand grains and other pollutants from entering the interior of the equipment and damaging the PTFE bushing 5.

[0036] The working principle and usage process of the present utility model: The bracket 1 fixes the first-level internal gear ring 2-1 and the second-level gear ring 2-2. The output end of the motor 4 drives the first-level planet gear 7-1-2 to rotate, thereby driving the first-level bracket 7-1-1. The first-level bracket 7-1-1 drives the second-level planet gear 7-1-3. The second-level planet gear 7-1-3 drives the second-level bracket 7-1-4. The second-level bracket 7-1-4 drives the third-level planet gear 7-1-5. The third-level planet gear 7-1-5 drives the third-level bracket 7-1-6. The third-level bracket 7-1-6 drives the fourth-level planet gear 7-2-1. The fourth-level planet gear 7-2-1 drives the fourth-level bracket 7-2-2. The fourth-level bracket 7-2-2 drives the fifth-level planet gear 7-2-3. The fifth-level planet gear 7-2-3 drives the fifth-level bracket 7-2-4. The fifth-level bracket 7-2-4 drives the sixth-level planet gear 7-2-5. The sixth-level planet gear 7-2-5 drives the output shaft 3, thereby completing the sequential transmission and finally realizing the operation of the output shaft 3 driven by the motor 4.

[0037] Although this specification is described according to the embodiments, not each embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0038] Therefore, the above description is only the preferred embodiment of the present application and is not used to limit the scope of implementation of the present application; that is, all equivalent transformations made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A high torque output precision planetary reducer, comprising a bracket (1) and an inner gear ring (2) arranged on the bracket (1), an output shaft (3) is arranged in the bracket (1), and a motor (4) is arranged at the end of the inner gear ring (2), characterized in that: The support (1) has a through cavity, which comprises a first cavity (1-1), a second cavity (1-2) and a third cavity (1-3) which are interconnected; the output shaft (3) comprises an output shaft body (3-1) adapted to the second cavity (1-2) and a limiting ring (3-2) adapted to the third cavity (1-3); the outer circumferential surfaces of the output shaft body (3-1) and the limiting ring (3-2) are connected to the support (1) by means of a polytetrafluoroethylene bushing (5); a gasket (6) is provided on the limiting ring (3-2) for limiting the shaking of the output shaft body (3-1) during axial rotation.

2. The high torque output precision planetary reducer according to claim 1, characterized in that: The inner gear ring (2) comprises a primary inner gear ring (2-1) and a secondary inner gear ring (2-2), wherein the primary inner gear ring (2-1) and the secondary inner gear ring (2-2) are connected via a fastener (8), the primary inner gear ring (2-1) is connected to the motor (4), and the secondary inner gear ring (2-2) is connected to the bracket (1).

3. The high torque output precision planetary reducer according to claim 2, characterized in that: The end portion of the motor (4) connected to the primary internal gear ring (2-1) is designed to be stepped, the stepped end portion matches the inner cavity shape of the primary internal gear ring (2-1), and a sealing ring is provided at the connection between the motor (4) and the primary internal gear ring (2-1).

4. The high torque output precision planetary reducer according to claim 1, characterized in that: The motor (4) and the output shaft (3) are connected in transmission via a multi-stage transmission assembly (7), and the multi-stage transmission assembly (7) is arranged inside the inner gear ring (2).

5. The high torque output precision planetary reducer according to claim 4, characterized in that: The multi-stage transmission assembly (7) comprises a first transmission component (7-1) and a second transmission component (7-2), wherein the first transmission component (7-1) is configured to engage with the motor (4), and the second transmission component (7-2) is designed to be connected to the output shaft (3), and the first transmission component (7-1) is connected to the second transmission component (7-2).

6. The high torque output precision planetary reducer according to claim 5, characterized in that: The first transmission component (7-1) comprises a primary bracket (7-1-1), a primary planetary gear (7-1-2) is fixed to the end surface of the primary bracket (7-1-1) via a needle roller, a plurality of secondary planetary gears (7-1-3) are arranged on the primary bracket (7-1-1), a secondary bracket (7-1-4) is arranged on the end surface of the primary bracket (7-1-1) away from the primary planetary gear (7-1-2), the plurality of secondary planetary gears (7-1-3) are connected to the secondary bracket (7-1-4) via a needle roller, a plurality of tertiary planetary gears (7-1-5) are arranged on the secondary bracket (7-1-4), a tertiary bracket (7-1-6) is arranged on the end surface of the secondary bracket (7-1-4) away from the primary bracket (7-1-1), the plurality of tertiary planetary gears (7-1-5) are connected to the tertiary bracket (7-1-6) via a needle roller.

7. The high torque output precision planetary reducer according to claim 6, characterized in that: The second transmission component (7-2) comprises a plurality of fourth-stage planetary gears (7-2-1) meshed with the third-stage bracket (7-1-6); the plurality of fourth-stage planetary gears (7-2-1) are connected to the fourth-stage bracket (7-2-2) via needle rollers; the fourth-stage bracket (7-2-2) is provided with a plurality of fifth-stage planetary gears (7-2-3); the plurality of fifth-stage planetary gears (7-2-3) are connected to the fifth-stage bracket (7-2-4) via needle rollers; the fifth-stage bracket (7-2-4) is provided with a plurality of sixth-stage planetary gears (7-2-5); the plurality of sixth-stage planetary gears (7-2-5) are connected to the end of the output shaft (3) via needle rollers.

8. The high torque output precision planetary reducer according to claim 7, characterized in that: The first-level bracket (7-1-1), the second-level bracket (7-1-4), the third-level bracket (7-1-6), the fourth-level bracket (7-2-2) and the fifth-level bracket (7-2-4) all include a sun gear, a tray and a flat key, and the sun gear is connected to the tray via the flat key.

9. The high torque output precision planetary reducer according to claim 1, characterized in that: A skeleton oil seal (9) is also provided between the bracket (1) and the output shaft (3).

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