Compound planetary speed reducer

By designing a composite planetary reducer, high reduction ratio output is achieved by utilizing planetary motion and contact radius difference, solving the problems of increased volume and lubrication interference in existing technologies, and realizing the miniaturization and high torque density design of the equipment.

CN122170218APending Publication Date: 2026-06-09FIRST DOME
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FIRST DOME
Filing Date
2026-03-05
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies struggle to achieve high reduction ratio output within a single module while avoiding preload and lubrication traction interference, leading to increased size and complex assembly, making it difficult to achieve both miniaturization and high power density design.

Method used

By employing a composite planetary reducer, the effective contact radius difference between the fixed ring and the output component is utilized to make the output angular velocity of the output component much smaller than that of the input component. Through the first-order tooth contact between the rolling teeth and the fixed gear ring, and the second-order traction contact between the rolling friction part and the inner ring surface of the output, a constant speed relationship and differential coupling are formed, achieving high reduction ratio output and avoiding preload and lubrication interference.

Benefits of technology

Achieving high reduction ratio output within a single module reduces size, avoids idle stroke angle and lubrication interference, and improves the feasibility of miniaturization and high torque density design of the equipment.

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Abstract

This invention provides a composite planetary reducer, comprising a housing and an input component, a fixed ring, a plurality of rolling components, and an output component disposed within the housing. The output component has an output inner ring surface. The inner ring of the fixed ring forms a fixed gear ring. The input component has an input tooth portion that passes through the fixed ring. One end of the rolling component has a rolling tooth portion that meshes with the input tooth portion and forms a first-order tooth contact with the fixed gear ring, and the other end has a rolling friction portion that forms a second-order traction contact with the output inner ring surface. By utilizing the difference between the effective contact radius of the output inner ring surface and the working pitch circle radius of the fixed gear ring, the rolling tooth portion and the rolling friction portion satisfy a constant speed relationship and form differential coupling during operation, thereby achieving a reduced volume and high reduction ratio output within a single module, while simultaneously avoiding preload and lubrication traction interference.
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