Cycloid Speed Reducer Input Ring Layout for Stable Operation
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Solution Overview
Problem
Existing speed reducers face challenges in ensuring stable operation and improved productivity.
Innovation Solution
A speed reducer design featuring a separate eccentric first inner ring that rotates with the input shaft, restricted by a movement restrictor, allowing for the use of different materials for each component, enhancing accuracy and ease of machining, and incorporating a cycloid gear with specific through holes and inner pins for improved stability and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the first inner ring is integrated with the input shaft, then the structure is simpler, but the positioning accuracy and stability are insufficient
Solution Approach 1:
The first inner ring is separated from the input shaft to form an independent component. This segmentation allows the first inner ring to be precisely positioned relative to the input shaft through dedicated positioning structures, improving positioning accuracy while maintaining reasonable structural complexity through modular design.
2Ease of manufacture
If the first inner ring is made separately from the input shaft, then material selection is more flexible and machining is easier, but the structure becomes more complex
Solution Approach 1:
By separating the first inner ring from the input shaft, each component can be manufactured independently using materials and processes optimized for their specific functional requirements, significantly improving ease of manufacture and material selection flexibility.
Solution Approach 2:
The separated first inner ring design allows it to serve multiple functions: supporting the input shaft, providing precise positioning, and enabling flexible material selection. This multi-functionality justifies the slight increase in component count while delivering substantial manufacturing advantages.
3Reliability
If the first inner ring rotates freely with the input shaft, then the operation is smoother, but movement control and stability are reduced
Solution Approach 1:
Positioning structures act as intermediaries between the first inner ring and the input shaft, controlling the relative movement and ensuring stable operation. These positioning structures guide the rotation while maintaining operational smoothness, resolving the contradiction between stability and ease of operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design ensures stable operation with enhanced productivity by allowing for precise positioning and material selection, reducing eccentricity errors, and facilitating easier machining and design changes.
Implementation Method 1
a first bearing including an eccentric first inner ring that rotates together with the input shaft
Implementation Method 2
a second bearing located radially outward of the cycloid gear, and including a second inner ring that is an output shaft, a second outer ring located radially outward of the second inner ring, and a rolling body located between the second inner ring and the second outer ring
Implementation Method 3
a cycloid gear located radially outward of the first bearing and including a plurality of external teeth arranged on an outer peripheral surface along circumferential directions
Implementation Method 4
a plurality of outer pins held on a radially inner surface of the second inner ring and meshing with the external teeth of the cycloid gear
Data Source
AI summary
A speed reducer includes: an input unit including an input shaft and first bearing including eccentric first inner ring rotating together with the input shaft; cycloid gear; multiple inner pins, inner pin holder holding end portions of the inner pins in the axial directions and surrounding the input unit outer peripheral surface; second bearing radially outward of the cycloid gear and including a second inner ring as an output shaft, second outer ring radially outward of the second inner ring, and rolling body between the second inner and rings; and a plurality of outer pins held on a radially inner surface of the second inner ring and meshing with external teeth of the cycloid gear. The first inner ring is separate from the input shaft. The input unit includes a movement restrictor restricting movement of the first inner ring relative to the input shaft in the circumferential directions.