Thin Web Flywheel Engine Torsional Coupling
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Solution Overview
Problem
Torsional couplings in engine systems face premature fatigue failure and performance degradation due to complex vibrations and deflections, particularly in designs with thick engine-side discs and thin driven-side discs, which lead to uneven stress distribution and bearing overload.
Innovation Solution
A torsional coupling design featuring a flywheel with an engine-side disc having a thin, discontinuous web (0.2-0.3 inches axial thickness) that flexes predominantly over a thicker driven-side disc, allowing for controlled elastic deformation and reduced angular deflection, thereby distributing loads more evenly and enhancing fatigue resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the engine-side disc has a thick web design, then the torsional coupling appears robust and strong, but it leads to uneven stress distribution and premature fatigue failure under complex vibrations and deflections
Solution Approach 1:
The patent applies local quality by varying the web thickness of the engine-side disc across different radial positions. The disc features a thinner inner web section (0.2-0.3 inches) and a thicker outer web section, allowing different regions to have optimized properties: the thinner inner section provides flexibility and stress distribution to reduce fatigue, while the thicker outer section maintains overall structural strength and rigidity.
2Strength
If the engine-side disc has a thick web design, then the structural strength is maintained, but it causes bearing overload and performance degradation
Solution Approach 1:
The patent applies parameter changes by modifying the web thickness parameter of the engine-side disc from a uniform thick design to a variable thickness design. The inner web thickness is reduced to 0.2-0.3 inches while the outer web remains thicker, changing the structural parameters to achieve more uniform stress distribution and reduce peak loads transmitted to the bearings.
3Reliability
If the engine-side disc has a thin web design, then fatigue resistance is improved, but the axial thickness becomes too small for structural integrity
Solution Approach 1:
The patent applies segmentation by dividing the engine-side disc web into multiple thickness zones: an inner thin web section (0.2-0.3 inches) for fatigue resistance, and an outer thick web section for structural integrity. This segmented approach allows each zone to perform its specific function optimally without compromising the overall disc performance.
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 significantly reduces angular deflection and stress on bearings, leading to improved fatigue resistance and reduced performance degradation, with optimal axial thicknesses of 0.22 and 0.31 inches for the engine-side disc web, effectively managing deflections without premature failure.
Implementation Method 1
The engine-side disc web has a lesser axial thickness such that the engine-side disc flexes predominantly over the driven-side disc, in response to loads deflecting the torsional coupling during the transfer of torque
Data Source
AI summary
An engine system includes an internal combustion engine, a driven unit, and a torsional coupling between a crankshaft of the engine and a driveshaft of the driven unit. The torsional coupling includes a driven-side disc coupled to the driveshaft, and a flywheel having an engine-side disc coupled to the crankshaft. The engine-side disc has an axial thickness in a discontinuous thickness range from about 0.2 inches to about 0.3 inches, so as to flex the engine-side disc predominantly over the driven-side disc in response to the driveline deflecting loads.