Cycloid Reducer Crankshaft Layout for Compact Bearing Assembly
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Solution Overview
Problem
Conventional cycloid speed reducers face challenges in miniaturization due to diameter limitations of eccentric and concentric ends, requiring different bearing sizes and materials, which hinder compact design and increase component costs.
Innovation Solution
The cycloid speed reducer design features a crankshaft with concentric and eccentric ends of equal diameters, allowing for a one-piece structure and standardized bearing specifications, enabling miniaturization and reducing component costs while improving alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the diameter of the eccentric end is made greater than the diameter of the concentric end to comply with bearing assembly requirements, then the bearing assembly process can be completed, but the miniaturization of the cycloid speed reducer is hindered
Solution Approach 1:
The invention changes the diameter parameter of the crankshaft ends from unequal (conventional design where eccentric end diameter > concentric end diameter) to equal (both ends have the same diameter). This parameter change allows the use of standardized bearings with uniform dimensions, enabling miniaturization while maintaining bearing assembly feasibility. The equal diameter design reduces the overall size requirement without compromising the bearing assembly process.
2Ease of manufacture
If different bearing sizes are used for eccentric and concentric ends, then the bearing assembly requirements are met, but the component costs increase and bearing material cannot be shared
Solution Approach 1:
The invention makes the crankshaft ends universal by giving them equal diameters, allowing the same bearing specifications to be used for both eccentric and concentric ends. This universality enables bearing material and components to be shared across different positions, reducing component variety, simplifying inventory management, and lowering overall costs while still meeting all bearing assembly requirements.
3Ease of manufacture
If the diameter of the eccentric end is limited to be greater than the concentric end, then bearing assembly compliance is achieved, but the alignment accuracy of the crankshaft is reduced
Solution Approach 1:
By changing the diameter parameter from unequal to equal, the invention improves crankshaft alignment accuracy. The equal diameter design creates symmetrical geometry that facilitates more precise alignment during assembly, while the standardized bearing specifications ensure proper fit and compliance with assembly requirements. This parameter change resolves the conflict between manufacturing compliance and alignment precision.
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
This design facilitates miniaturization of the cycloid speed reducer, reduces component costs by using identical bearing materials, and enhances the accuracy of crankshaft alignment, addressing the limitations of conventional cycloid speed reducers.
Implementation Method 1
The rolling assembly includes a wheel disc and a plurality of rolling pins. The plurality of rolling pins are disposed on the wheel disc. The first cycloid disc includes a first tooth part contacted with the corresponding rolling pin.
Data Source
AI summary
A cycloid speed reducer includes an input shaft, a rolling assembly, first and second cycloid discs, a crankshaft and an output disc. The first and second cycloid discs are disposed around the input shaft and driven by the input shaft. The first and second cycloid discs are located at two opposite sides of the rolling assembly, respectively. The crankshaft includes first and second eccentric ends and first and second concentric ends integrally formed as a one-piece structure and arranged sequentially. The first and second eccentric ends are linked with the first and second cycloid discs respectively. An eccentricity value is between any neighboring two of the concentric and eccentric ends. The diameters of all the concentric and eccentric ends are equal. The output disc is linked with the first or second concentric end. The output disc is a power output end of the cycloid speed reducer.