Cycloid Speed Reducer Assembly for High-Load Vibration Control
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Solution Overview
Problem
Conventional cycloid speed reducers face issues such as high volume, weight, and assembly complexity, as well as low rigidity and vibration due to insufficient structural strength, which limits their application in high-load situations and requires additional weight compensation for dynamic equilibrium.
Innovation Solution
A cycloid speed reducer design featuring an eccentric device with multiple roller assemblies and rotating disc assemblies, where each disc assembly includes two cycloid discs with specific tooth and perforation configurations, and a connecting element that maintains opposite eccentric directions, reducing load on individual discs and eliminating the need for additional weight compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cycloid speed reducers use two cycloid discs with eccentric shaft, then high transmission ratio and compact structure are achieved, but structural strength is insufficient and vibration occurs under high load
Solution Approach 1:
The patent divides the single cycloid disc into two separate cycloid discs (first and second cycloid discs), each independently supported by its own bearing. This segmentation distributes the load across multiple components, enhancing structural strength and reducing vibration under high load conditions.
Solution Approach 2:
The patent combines two cycloid disc assemblies into a single integrated speed reducer unit, where both discs work simultaneously to transmit power. This merging approach maintains compact structure while achieving high transmission ratio and improved strength through load distribution.
2Ease of operation
If conventional cycloid speed reducers use eccentric shaft for rotation, then transmission function is achieved, but dynamic equilibrium is deflected and weight compensation device is required
Solution Approach 1:
The patent introduces a counterweight that rotates with the input shaft to compensate for the dynamic imbalance caused by the eccentric shaft. The counterweight's mass is positioned to balance the centrifugal forces generated by the eccentric rotation, eliminating vibration and removing the need for additional weight compensation devices.
Solution Approach 2:
The patent employs dynamic balancing by introducing a rotating counterweight that adjusts the mass distribution during operation. This dynamic approach maintains smooth operation while eliminating the need for static weight compensation, simplifying the overall device structure.
3Strength
If RV-E series reducer uses two-stage reduction design with metallic gears, then high rigidness and high reduction ratio are achieved, but volume and weight are larger and assembly process is complicated
Solution Approach 1:
The patent replaces the complex two-stage metallic gear system with a cycloid-based mechanical system that achieves high reduction ratios in a single stage. The cycloid discs with their specific tooth profiles provide the necessary mechanical advantage while maintaining high rigidness, thereby simplifying the assembly process and reducing the number of components.
4Weight of moving object
If harmonic drive reducer uses flexible gear for elastic deformation, then smaller size and lighter weight are achieved, but rigidity is low and impact resistance is poor
Solution Approach 1:
The patent employs a composite structure where the cycloid discs are made of rigid metallic materials capable of withstanding high impact loads. The combination of the eccentric shaft mechanism with the rigid cycloid discs achieves both compact size and high impact resistance, overcoming the limitations of flexible gear-based harmonic drives.
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 enhances structural strength and rigidity, allowing the cycloid speed reducer to handle high loads without vibration and simplifies assembly, reducing costs and labor while maintaining dynamic equilibrium.
Implementation Method 1
The eccentric assembly is eccentrically fixed on the rotating shaft and arranged between a first end and a second end of the rotating shaft. The eccentric assembly is driven by the rotating shaft to eccentrically rotate relative to an axle center of the rotating shaft.
Implementation Method 2
The plurality of first rollers are disposed on the first wheel disc. The at least one outer tooth is in contact with the corresponding first roller of the plurality of first rollers.
Data Source
AI summary
A two-stage cycloid speed reducer comprises two rotating disc assemblies. Each rotating disc assembly comprises two cycloid discs. In other words, the cycloid speed reducer has four cycloid discs to be in contact with the corresponding rollers. Consequently, the load withstood by each cycloid disc is reduced. Since the cycloid speed reducer has stronger structural strength, the cycloid speed reducer can be applied to the high-load circumstance. Moreover, an eccentric assembly of the eccentric device includes a plurality of eccentric cylinders. The eccentric cylinders are disposed within the axle holes of the corresponding cycloid discs. Due to the eccentric cylinders, the eccentric direction of two cycloid discs is opposite to the eccentric direction of the other two cycloid discs. Consequently, it is not necessary to install an additional weight compensation device in the cycloid speed reducer to compensate the dynamic equilibrium. Moreover, the cycloid speed reducer can be assembled easily.