Cycloid Speed Reducer Assembly With Integrated Encoder Layout
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Solution Overview
Problem
Conventional cycloid speed reducers are large in size, not conducive to miniaturization, and lack closed-loop feedback control accuracy due to the need for external encoders, which complicates the design and increases costs.
Innovation Solution
A cycloid speed reducer assembly with a miniaturized structure that integrates encoders between the speed reducer and motor, utilizing a spacer ring to adjust bearing clearances and omitting end covers for improved control accuracy and cost-effectiveness, allowing dual encoder applications and torque sensing through a flexible structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional cycloid speed reducer is used, then high transmission ratio and compact structure are achieved, but the size is still large and not conducive to miniaturization
Solution Approach 1:
The cycloid speed reducer is divided into modular components: input shaft assembly, cycloid disc assembly, needle bearing assembly, and output shaft assembly. This segmentation allows for optimized sizing of each component and facilitates miniaturization while maintaining the high transmission ratio characteristics.
Solution Approach 2:
The patent employs nested structural arrangements where the cycloid disc is positioned within the housing, the needle bearings are nested within the cycloid disc structure, and the output shaft is nested within the overall assembly. This nesting approach maximizes space utilization and reduces the overall volume of the speed reducer.
2Measurement precision
If an encoder is added to the output end of the reducer for closed-loop feedback control, then control accuracy is improved, but the design mechanism becomes complicated and cost increases
Solution Approach 1:
The encoder is integrated directly into the output shaft assembly of the cycloid speed reducer, merging the feedback device with the mechanical transmission component. This combination eliminates the need for separate external encoder mounting structures and complex routing mechanisms, thereby reducing design complexity while maintaining control accuracy.
Solution Approach 2:
The patent introduces an intermediary coupling structure that connects the encoder shaft to the output shaft, allowing the encoder to be positioned within the reducer housing without requiring complex external mounting. This intermediary element simplifies the overall design by providing a straightforward integration path between the mechanical and measurement systems.
3Measurement precision
If an encoder is added to the output end of the reducer for closed-loop feedback control, then control accuracy is improved, but circuitry routing becomes difficult
Solution Approach 1:
The encoder and its circuitry are integrated within the same housing as the cycloid speed reducer, merging the measurement system with the mechanical system. This integration allows for simplified internal routing of cables and connections, eliminating the need for complex external circuitry routing while maintaining control accuracy.
4Reliability
If traditional end cover design is used for sealing, then sealing function is achieved, but material costs increase and overall volume increases
Solution Approach 1:
The patent extracts the sealing function from the traditional end cover design and integrates it directly into the housing structure. By removing the separate end cover component and incorporating sealing elements (such as seals or gaskets) directly into the housing, the overall volume is reduced and material costs are decreased while maintaining reliable sealing functionality.
Data Source
AI summary
A cycloid speed reducer assembly is disclosed for optimizing the component structure. The accommodation space required for the sealing element is integrated into the track ring to save the material costs and significantly reduce the overall volume. A spacer ring placed between the front and rear bearings is used to adjust the clearances of the front bearing and the rear bearing to facilitate the quantitative production and control the yield. Since the compact structure of the cycloid speed reducer assembly includes two output ends, it facilitates to arrange an encoder between the speed reducer and the motor for closed-loop feedback control, so as to improve the control accuracy of the system. With the hollow input shaft, dual encoder applications can be realized. When a flexible structure is added to the output end, the flexible structure can be connected to another encoder to further realize the application of the torque sensor.