Speed Reducer With Offset Internal Gears
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Solution Overview
Problem
Existing speed reducers for precision tools and robotic components face challenges in achieving high-precision and steady torque transmission while minimizing size and volume, often resulting in gaps or inefficiencies in gear engagement.
Innovation Solution
The speed reducer employs an offset configuration of internal gears and a connecting column with protrusions and scarf holes, ensuring zero-gap transmission and precise torque output through a coaxial arrangement of the input and output shafts, utilizing a gear assembly with an external gear and internal gears that maintain engagement without rotation of the external gear, allowing for high-precision and steady torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional gear engagement is used, then torque transmission is achieved, but gaps in gear engagement occur resulting in low precision and unstable torque
Solution Approach 1:
The patent inverts the conventional gear engagement approach by making the internal gears rotate while keeping the external gear stationary. This reversal of motion roles eliminates engagement gaps and achieves zero-gap transmission, directly resolving the precision and stability contradiction
Solution Approach 2:
The patent introduces dynamic adjustment mechanisms including offset pieces that can move radially and offset adjustment holes that allow positional adjustment. These dynamic elements enable continuous optimization of gear engagement, eliminating gaps and ensuring stable torque transmission throughout operation
2Reliability
If high-precision gear engagement is achieved, then torque transmission stability improves, but device volume and size increase
Solution Approach 1:
The patent employs nested arrangement where multiple internal gears are positioned concentrically within the external gear. This nesting allows multiple gear stages to occupy the same radial space, achieving high-precision zero-gap engagement without proportionally increasing the overall device volume
Solution Approach 2:
The patent transitions from conventional radial gear arrangement to a coaxial configuration with input and output shafts aligned on the same axis. This dimensional reorganization optimizes space utilization and reduces the overall footprint while maintaining precise engagement
3Manufacturing precision
If offset configuration with multiple components is used, then zero-gap transmission is achieved, but device complexity increases
Solution Approach 1:
The patent combines multiple functional elements into integrated components. The offset pieces are integrated with the internal gears, and the connecting column integrates the output shaft connection with the gear assembly. This merging reduces the number of separate parts while maintaining the zero-gap transmission capability
Data Source
AI summary
A speed reducer includes an input shaft, an output shaft, and a gear assembly coupled to the input shaft. The gear assembly includes a housing, an external gear, and at least two internal gears. The external gear is located within the housing and inscribes the at least two internal gears. One side of the at least two internal gears is rotatably coupled to the input shaft, and another side of the at least two internal gears is coupled to a connecting column of the output shaft. The at least two internal gears are offset on the input shaft, and the input shaft drives the at least two internal gears to maintain engagement with the external gear. The connecting column maintains transmission of the output shaft and the at least two internal gears.