Chain Transmission Link Thickness Optimization
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Solution Overview
Problem
Existing transmission assemblies with chains for holding rolling elements face issues of friction and distortion due to improperly designed link thickness, leading to unsmooth motion and reduced service life, as the links interfere with the screw's surface and cause uneven stress on spacers.
Innovation Solution
A chain type transmission assembly with links of specific thickness (K≤2×((PCD²)-(BD+S²)²-D²) to prevent interference with the screw's surface, ensuring smooth motion by calculating the thickness to align with the pitch circle diameter and maintaining the links' width smaller than the load path pitch to avoid link interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the link thickness is not precisely designed, then the chain structure is simpler to manufacture, but the link will interfere with the screw surface causing friction and distortion
Solution Approach 1:
The patent applies parameter changes by precisely defining the link thickness T using a specific mathematical formula that relates it to the screw outer diameter d1, pitch circle diameter d2, and rolling element diameter d3. This parameter optimization ensures the link is thin enough to avoid interference with the screw surface while maintaining structural integrity, thereby resolving the contradiction between ease of manufacture and reliable interference-free operation.
2Ease of manufacture
If the link thickness is not precisely designed, then the chain assembly is easier to manufacture, but friction increases causing distortion and reduced service life
Solution Approach 1:
The patent uses parameter changes by establishing a precise mathematical relationship for link thickness T = (d2 - d1)/2 - d3/2, where the parameters are derived from the screw and rolling element dimensions. This optimized parameter ensures minimal contact with the screw surface, reducing friction and distortion while maintaining manufacturability.
Solution Approach 2:
The patent applies preliminary anti-action by designing the link thickness in advance to prevent interference before it occurs. The calculated thickness ensures the link does not contact the screw surface during operation, proactively eliminating the source of friction and distortion rather than addressing them after they occur.
3Ease of manufacture
If the link thickness is improper, then the chain is easier to manufacture, but stress concentrates on spacer edges accelerating abrasion
Solution Approach 1:
The patent applies parameter changes by precisely calculating the link thickness T to ensure uniform stress distribution. The formula T = (d2 - d1)/2 - d3/2 ensures the link is thin enough to allow rolling elements to abut closely against spacers, distributing stress evenly across the spacer surfaces rather than concentrating it on edges, thereby preventing accelerated abrasion and extending service life.
4Device complexity
If the link thickness is not precisely designed, then the chain structure is simpler, but unsmooth motion or link breakage occurs
Solution Approach 1:
The patent applies parameter changes by defining the link thickness T with a precise mathematical formula that ensures smooth chain motion and prevents breakage. The optimized thickness allows proper engagement between rolling elements and spacers while maintaining adequate link strength, achieving both smooth operation and link integrity without excessive design complexity.
Data Source
AI summary
A chain type transmission assembly doesn't have the problem that the chain interferes with the transmission assembly, the thickness of the links of the chain of the transmission assembly is precisely calculated by an equation, so that the chain can be prevented from interfering with the outer surface of the screw, thus substantially improving the efficiency and service life of the transmission assembly.