Cycloid Speed Reducer With Split Crankshafts for Miniaturization
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Solution Overview
Problem
Conventional cycloid speed reducers face challenges in miniaturization, require different bearing sizes, and have high fabricating costs due to complex processing needs for dual eccentric crankshafts.
Innovation Solution
The cycloid speed reducer design features two separate crankshafts with single eccentric structures, a ring-shaped rolling assembly, and matching bearing sizes, allowing for miniaturization and reduced component and processing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a single crankshaft with dual eccentric structure is used, then power output is evened and dynamic balance is enhanced, but the external diameter must be increased to accommodate bearing assembly requirements
Solution Approach 1:
The single crankshaft with dual eccentric structure is divided into two separate crankshafts, each with a single eccentric structure. This segmentation allows each crankshaft to have a smaller external diameter while maintaining the overall dynamic balance through the coordinated arrangement of the two crankshafts.
Solution Approach 2:
Two separate crankshafts are combined to work together in driving the two cycloid discs. By merging their functions, the system achieves even power output and dynamic balance while each individual crankshaft can have a reduced external diameter suitable for standard bearing assembly.
2Power
If a single crankshaft with dual eccentric structure is used, then power transmission is achieved, but different bearing sizes are required increasing component complexity
Solution Approach 1:
The power transmission function is segmented across two separate crankshafts, each driving its own cycloid disc independently. This allows the use of identical bearings on each crankshaft, simplifying component inventory and assembly while maintaining full power transmission capability.
Solution Approach 2:
The two crankshafts are designed with identical dimensions and bearing requirements, making them universal interchangeable components. Each crankshaft can serve the same function, allowing for standardized bearing selection and simplified procurement and assembly processes.
3Shape
If a single crankshaft with dual eccentric structure is used, then the crankshaft structure is formed, but processing complexity and fabricating cost are increased
Solution Approach 1:
The complex dual eccentric crankshaft is segmented into two simpler single eccentric crankshafts. Each crankshaft requires only a single eccentric machining operation rather than dual eccentric operations, significantly reducing processing complexity and fabrication cost while achieving the same functional result.
Solution Approach 2:
Instead of machining one complex dual eccentric crankshaft, the design uses two identical copies of a simpler single eccentric crankshaft. This copying approach simplifies the machining process for each individual crankshaft and reduces the overall manufacturing complexity through standardization.
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 achieves even power output and dynamic balance while enabling miniaturization and cost reduction by simplifying the bearing assembly and processing requirements.
Implementation Method 1
The rolling assembly includes a ring-shaped structure and a plurality of rolling pins. The plurality of rolling pins are disposed on the ring-shaped structure. The at least one first tooth part is contacted with the corresponding rolling pin. The at least one second tooth part is contacted with the corresponding rolling pin.
Data Source
AI summary
A cycloid speed reducer includes an input shaft, a rolling assembly, a first cycloid disc, a second cycloid disc, a first crankshaft, a second crankshaft, a first output disc and a second output disc. The first cycloid disc and the second cycloid disc are disposed around the input shaft and rotated with the input shaft. The first cycloid disc and the second cycloid disc are located at two opposite sides of the rolling assembly, respectively. The first crankshaft includes a first concentric end and a first eccentric end. The first eccentric end is linked with the first cycloid disc. The second crankshaft includes a second concentric end and a second eccentric end. The second eccentric end is linked with the second cycloid disc. The first output disc is linked with the first concentric end. The second output disc is linked with the second concentric end.