Rotary Joint Transmission Nesting for Compact Robot Joint Assembly
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Solution Overview
Problem
Existing rotary joint transmission mechanisms in automated machinery occupy high axial space and underutilize radial space, leading to inefficient assembly and increased complexity.
Innovation Solution
A triple nested structure for the transmission mechanism, where the housing, input shaft, and output shaft are arranged in a radial configuration, allowing for compact design and efficient use of radial space while maintaining good assembly coaxiality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If components are arranged sequentially along the axial direction, then the assembly structure is simple, but the axial space occupation is high and radial space utilization is low
Solution Approach 1:
The patent applies nesting by placing the input shaft inside the output shaft, and the housing around the input shaft, creating a triple nested structure. This allows multiple components to occupy the same axial space while maintaining functional independence, reducing overall axial space occupation by up to 26% compared to sequential arrangement.
Solution Approach 2:
The patent transitions from one-dimensional axial arrangement to three-dimensional radial nesting. By utilizing the radial dimension to arrange components concentrically, the design maximizes space utilization in all directions, particularly reducing axial length while maintaining component functionality and assembly simplicity.
2Device complexity
If components are arranged sequentially along the axial direction, then the assembly structure is simple, but the radial space utilization is low
Solution Approach 1:
The nested arrangement of housing containing input shaft containing output shaft allows components to share the same radial envelope, maximizing radial space utilization. The concentric configuration ensures that each component utilizes the available radial space efficiently without interfering with others, while maintaining structural simplicity.
Solution Approach 2:
The patent merges the spatial occupation of multiple components into a single radial envelope by arranging them concentrically. This combining of spatial usage allows the transmission mechanism to fit within a compact radial boundary while maintaining functional independence of each component.
3Length of stationary object
If triple nested structure is adopted, then axial space is reduced and radial space utilization is maximized, but assembly complexity increases
Solution Approach 1:
The patent segments the nested structure into distinct modular components (housing, input shaft, output shaft) with clearly defined interfaces. Each component can be manufactured and assembled independently, then fitted together in a systematic sequence, reducing the perceived assembly complexity despite the compact nested configuration.
Solution Approach 2:
The design incorporates preliminary positioning features such as stepped configurations and protruding ends that guide the assembly process. These pre-built features ensure proper alignment and positioning during assembly, reducing the skill level and time required despite the complex nested structure.
Data Source
AI summary
A transmission mechanism for a rotary joint, a robot joint and a robot. The transmission mechanism includes a driving member, a transmission member, an output shaft, an input shaft, and a housing. The driving member has a driving end. The transmission member has an output end and an input end. The output shaft is drivingly connected to the output end. The input shaft is drivingly connected to both the driving end and the input end, and sleeved on the output shaft. The housing is arranged around the input shaft. The housing, the input shaft and the output shaft are in a triple nested structure. The implementation of the present disclosure can compress a total length of the joint, save axial space, and make full use of radial space, while satisfying good assembly coaxiality.