Modular Coaxial Gear Reduction for Precise Concentric Assembly
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Solution Overview
Problem
Existing planetary gear based reducers face complications in assembly, accuracy, and concentricity, leading to increased machining difficulty and cost, noise, and reduced transmission efficiency.
Innovation Solution
A modularized coaxial gear set reduction mechanism is designed with a housing, transmission axle, internally toothed ring track, and a coaxial gear set comprising a sun gear, planetary gear set, and output member, allowing for pre-assembly and easy mounting to simplify assembly, enhance concentricity, and reduce machining complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional planetary gear components are sequentially mounted to input axle, then assembly process is completed, but assembly complexity increases and concentricity accuracy deteriorates
Solution Approach 1:
The reduction mechanism is divided into modular components: input assembly (including input axle and sun gear), planetary gear assembly (with carrier frame and planetary gears), and output assembly (with output member and internally toothed ring). Each module can be assembled and serviced independently, significantly simplifying the overall assembly process and reducing the number of sequential mounting steps required.
2Manufacturing precision
If machining precision of each component is heightened to improve concentricity, then concentricity accuracy improves, but machining difficulty and fabrication cost increase
Solution Approach 1:
Concentricity locating structures are pre-integrated into the modular components during manufacturing. The input assembly includes a concentricity locating structure on the input axle, and the planetary gear assembly includes corresponding locating structures on the carrier frame. These pre-built locating features ensure accurate concentricity when modules are assembled together, eliminating the need for extremely high machining precision on all individual components and thereby reducing overall machining difficulty and cost.
3Reliability
If traditional assembly method is used, then components are mounted sequentially, but concentricity deviation occurs and transmission efficiency decreases
Solution Approach 1:
Concentricity locating structures serve as intermediary elements between the input assembly and planetary gear assembly. These locating structures (including locating holes, locating pins, and corresponding recesses) act as mediators that automatically ensure accurate concentric alignment when the modules are assembled together, eliminating concentricity deviation and ensuring high transmission efficiency without requiring extremely high machining precision on all components.
Data Source
AI summary
A mechanism includes a housing, a transmission axle arranged at a center of the housing, an internally toothed ring track fixed to an inner circumference of the housing, and a coaxial gear set arranged between the transmission axle and the internally toothed ring track. The coaxial gear set includes a sun gear, a planetary gear set, and an output member. The planetary gear set includes a first carrier frame and a second carrier frame rotatably arranged at two ends of the sun gear. Multiple planetary gears are rotatably arranged between the first and second carrier frames and around the sun gear. Each of the planetary gears is in meshing engagement with the output member. The coaxial gear set is made in a modularized form for subsequent assembly in an optional manner, so as to provide an efficacy of easing assembling and servicing operations.