Cycloid Speed Reducer With External Teeth for Easier Machining
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Solution Overview
Problem
Conventional speed reducers, such as RV, harmonic drive, and cycloid reducers, face issues like high volume and weight, high cost, inability to withstand high impact, teeth difference friction, and limited reduction ratio, with cycloid reducers also having difficulties in machining teeth.
Innovation Solution
A cycloid speed reducer design featuring a transmission shaft, eccentric wheel, first and second wheel assemblies with rollers and teeth, allowing for easy machining and high reduction ratios, while reducing volume and weight and increasing rigidity to withstand high impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional cycloid speed reducer uses traditional tooth formation method, then high reduction ratio is achieved, but machining difficulty increases significantly
Solution Approach 1:
The patent inverts the traditional tooth formation approach by forming convex external teeth on the cycloid wheel instead of the conventional concave internal teeth. This inversion fundamentally changes the machining process from difficult internal cavity machining to easier external surface machining, while preserving the high reduction ratio functionality of the cycloid mechanism
2Strength
If RV reducer uses metallic gears, then high rigidity and long life are achieved, but volume and weight increase
Solution Approach 1:
The patent merges the advantages of metallic gear strength with the compactness of cycloid mechanisms. By using metallic material for the cycloid wheel with externally formed teeth, the design combines the high rigidity and durability of metal gears with the space-efficient structure of cycloid speed reduction, achieving both strength and compactness simultaneously
3Weight of moving object
If harmonic drive reducer uses flexible element, then smaller size and lighter weight are achieved, but impact resistance decreases
Solution Approach 1:
The patent changes the material parameter from flexible to metallic rigid material for the cycloid wheel. This parameter change enables the structure to withstand high impact loads while maintaining the compact size advantage, as the metallic material provides both the structural integrity needed for impact resistance and the space efficiency of the cycloid design
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 achieves a high reduction ratio, simplifies assembly, reduces cost, and extends the lifespan of the speed reducer by combining the benefits of RV and harmonic drive reducers with improved machining ease and increased rigidity.
Implementation Method 1
The eccentric wheel is eccentrically fixed on the second end of the transmission shaft, and the eccentric wheel is driven by the transmission shaft to eccentrically rotate relative to an axle center of the transmission shaft
Data Source
AI summary
A speed reducer comprises a transmission shaft, an eccentric wheel, a first wheel assembly, a rotating wheel and a second wheel assembly. The first wheel assembly comprises a first wheel disc and at least one first roller. The at least one first roller is disposed on the inner wall of first wheel disc. The rotating wheel comprises a main body comprising an outer ring structure and a concave structure. The outer ring structure comprises at least one first tooth. The at least one first tooth is in contact with the corresponding first roller. At least one second roller is disposed within the concave structure. The second wheel assembly comprises a second wheel disc and at least one second tooth. The at least one second tooth is disposed on an outer periphery of the second wheel assembly. The at least one second tooth is in contact with the corresponding second roller.