Bearingless composite planetary reducer

Abstract

The utility model discloses a bearingless compound planetary reducer which comprises a primary planetary reduction structure and a secondary planetary reduction structure, planet wheels of the primary planetary reduction structure and the secondary planetary reduction structure are coaxially and rigidly connected, and a sun wheel of the primary planetary reduction structure is used as a rotating input end. A gear ring of the second-stage planetary speed reduction structure is used for carrying out speed reduction transmission on the rotating output end; according to the planetary reducer, the two-stage planetary speed reduction structure is adopted for speed reduction transmission, the planet gears of the two-stage planetary speed reduction structure are coaxially and rigidly connected, the gear ring of the two-stage planetary speed reduction structure is used as the rotating output end, a planet carrier is not needed, the number of parts is reduced, the mass is reduced, the hollow diameter is increased, and machining and assembling of the planetary reducer can be simplified.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer technology, specifically to a bearingless composite planetary speed reducer. Background Technology

[0002] Existing types of reducers include harmonic reducers, RV reducers, and planetary reducers. Among them, planetary reducers are widely used due to their low manufacturing cost and simple structure. Traditional planetary reducers require a carrier and bearings to support the planetary gears, which increases inertia. To achieve low backlash, high-precision gear grinding and carrier and bearing machining are required. The machining deviation of the carrier limits the number of planetary gears, making it difficult to further improve the reduction ratio and torque density. Utility Model Content

[0003] Technical objective: To address the shortcomings of existing planetary reducer structures, this utility model discloses a bearingless composite planetary reducer.

[0004] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution:

[0005] A bearingless composite planetary reducer includes a first-stage planetary reduction structure and a second-stage planetary reduction structure. The planetary gears of the first-stage and second-stage planetary reduction structures are rigidly connected coaxially. The sun gear of the first-stage planetary reduction structure is used as the rotation input end, and the gear ring of the second-stage planetary reduction structure is used as the rotation output end for speed reduction transmission.

[0006] Preferably, the first-stage planetary reduction structure of this utility model includes a first-stage sun gear, a first-stage ring gear, and a plurality of first-stage planetary gears meshing with the first-stage sun gear and the first-stage ring gear. The first-stage planetary gears are evenly distributed along the circumference of the first-stage sun gear, and the first-stage ring gear remains fixed. The first-stage sun gear drives the first-stage planetary gears to rotate and revolve simultaneously.

[0007] Preferably, the two-stage planetary reduction structure of this utility model includes a second-stage planetary gear fixed to the first-stage planetary gear and a second-stage gear ring disposed on the outer circumference of the second-stage planetary gear and meshing with the second-stage planetary gear. The second-stage planetary gear drives the second-stage gear ring to rotate for rotational output. A second-stage sun gear is disposed on the inner circumference of the second-stage planetary gear to provide radial support for the second-stage planetary gear.

[0008] Preferably, the second-stage planetary gear and the first-stage planetary gear of this invention are integrally machined.

[0009] Preferably, the primary gear ring of this invention is provided with a fixed housing on its exterior, and is assembled onto the corresponding mounting surface through the fixed housing.

[0010] Beneficial effects: The bearingless composite planetary reducer disclosed in this utility model has the following beneficial effects:

[0011] 1. This utility model adopts a two-stage planetary reduction structure for speed reduction transmission. The planetary gears of the two-stage planetary reduction structure are rigidly connected by coaxiality. The gear ring of the two-stage planetary reduction structure is used as the rotation output end. There is no need to use a planet carrier, the number of parts is reduced, the weight is reduced, and the hollow diameter is increased, which can simplify the processing and assembly of the planetary reducer.

[0012] 2. The planetary gears of this two-stage planetary reduction structure can float radially between the corresponding ring gear and sun gear according to the operating state, so that the load is automatically and evenly distributed, thereby improving the load-bearing capacity of the reducer. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the planetary reducer structure of this utility model;

[0015] Among them, 1-first-stage sun gear, 2-first-stage gear ring, 3-first-stage planetary gear, 4-second-stage planetary gear, 5-second-stage gear ring, 6-second-stage sun gear. Detailed Implementation

[0016] Reference will now be made in detail to embodiments of the present disclosure, one or more of which are set forth herein. Each embodiment and example is provided by way of explanation of the apparatus, composition, and materials of the present disclosure, and not by way of limitation. Rather, the following description provides convenient illustrations for implementing exemplary embodiments of the present disclosure. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0017] like Figure 1 As shown, this utility model discloses a bearingless composite planetary reducer, including a first-stage planetary reduction structure and a second-stage planetary reduction structure. The planetary gears of the first-stage and second-stage planetary reduction structures are coaxially rigidly connected. The sun gear of the first-stage planetary reduction structure is used as the rotation input end, and the gear ring of the second-stage planetary reduction structure is used as the rotation output end for speed reduction transmission. This realizes direct transmission using planetary gears without the need for a planet carrier, reducing the number of reducer components, reducing the weight of the reducer, and also reducing the precision requirements for planetary gear machining, simplifying the machining and assembly process of the reducer.

[0018] Specifically, the first-stage planetary reduction structure of this utility model includes a first-stage sun gear 1, a first-stage ring gear 2, and a plurality of first-stage planetary gears 3 meshing with the first-stage sun gear 1 and the first-stage ring gear 2. The first-stage planetary gears 3 are evenly distributed along the circumference of the first-stage sun gear 1, and the first-stage ring gear 2 remains fixed. The first-stage sun gear 1 drives the first-stage planetary gears 3 to rotate and revolve simultaneously.

[0019] The two-stage planetary reduction structure of this utility model includes a second-stage planetary gear 4 fixed to the first-stage planetary gear 3 and a second-stage gear ring 5 disposed on the outer periphery of the second-stage planetary gear 4 and meshing with the second-stage planetary gear 4. The second-stage planetary gear 4 drives the second-stage gear ring 5 to rotate for rotational output. A second-stage sun gear 6 is disposed on the inner periphery of the second-stage planetary gear 4 to provide radial support for the second-stage planetary gear 4.

[0020] The first-stage planetary gear 3 and the second-stage planetary gear 4 are not affected by the planet carrier. During the operation of the planetary reducer, their positions can freely float according to the operating state, thereby ensuring uniform load distribution and improving the load-bearing capacity of the reducer. The first-stage planetary gear 3 and the second-stage planetary gear 4 can be coaxially connected and fixed by two separate gears, or the second-stage planetary gear 4 and the first-stage planetary gear 3 can be integrally machined according to the requirements of the reducer during the processing stage.

[0021] In use, the planetary reducer of this invention has a fixed housing on the outside of the first-stage ring gear 2, which is mounted on the corresponding mounting surface. The first-stage sun gear 1 is directly connected to the rotor of the motor or connected through a coupling. The motor drives the first-stage sun gear 1 to rotate, while the first-stage ring gear 2 remains fixed. The first-stage planetary gear 3 and the second-stage planetary gear 4 rotate synchronously, driving the outer ring of the second-stage ring gear to rotate. The second-stage ring gear is connected to the output shaft, thereby achieving a speed reduction output for the motor rotation.

[0022] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A bearingless compound planetary reducer characterized by, It includes a first-stage planetary reduction structure and a second-stage planetary reduction structure. The planetary gears of the first-stage and second-stage planetary reduction structures are rigidly connected coaxially. The sun gear of the first-stage planetary reduction structure is used as the rotation input end, and the gear ring of the second-stage planetary reduction structure is used as the rotation output end for speed reduction transmission.

2. A bearingless compound planetary speed reducer according to claim 1, characterized in that, The first-stage planetary reduction structure includes a first-stage sun gear (1), a first-stage ring gear (2), and several first-stage planetary gears (3) that mesh with the first-stage sun gear (1) and the first-stage ring gear (2). The first-stage planetary gears (3) are evenly distributed along the circumference of the first-stage sun gear (1), and the first-stage ring gear (2) remains fixed. The first-stage sun gear (1) drives the first-stage planetary gears (3) to rotate and revolve simultaneously.

3. A bearingless compound planetary speed reducer according to claim 2, characterized in that, The secondary planetary reduction structure includes a secondary planetary gear (4) fixed to the primary planetary gear (3) and a secondary gear ring (5) set on the outer circumference of the secondary planetary gear (4) and meshing with the secondary planetary gear (4). The secondary gear ring (5) is rotated by the secondary planetary gear (4) to generate rotation output. A secondary sun gear (6) is set on the inner circumference of the secondary planetary gear (4) to provide radial support for the secondary planetary gear (4).

4. A bearingless compound planetary speed reducer according to claim 3, characterized in that, The secondary planetary gear (4) and the primary planetary gear (3) are integrally machined.

5. A bearingless compound planetary speed reducer according to claim 2, characterized in that, The first-stage gear ring (2) is provided with a fixed housing on the outside, and is assembled on the corresponding mounting surface through the fixed housing.

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