Flexible Flywheel Spoke Layout for Vibration Damping and Controlled Breakage
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Solution Overview
Problem
Conventional flexible flywheels face challenges in improving vibration attenuation characteristics while minimizing the risk of elastic disc breakage and subsequent fragment scattering, as reducing rigidity to enhance vibration absorption makes the disc more prone to breakage.
Innovation Solution
The flexible flywheel design incorporates a shaft fastening portion, an annular inertia ring, elastic spoke portions, and weight portions, with stress concentration areas strategically positioned to control breakage and prevent fragment scattering, featuring a unique configuration of stress concentration portions on the elastic spoke portions and weight portions to manage stress distribution and breakage mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rigidity of the elastic disc is reduced to improve vibration attenuation characteristics, then the vibration absorption capability is improved, but the elastic disc becomes more prone to breakage and fragment scattering
Solution Approach 1:
The elastic disc is divided into multiple elastic spoke portions radially arranged around the central axis. This segmentation allows each spoke to independently deflect and absorb vibration while maintaining structural integrity through the distributed configuration, resolving the contradiction between vibration attenuation and breakage resistance
Solution Approach 2:
Stress concentration portions are strategically provided at specific locations (both side edges of each elastic spoke portion) to control where stress accumulates during vibration. This localized stress management allows the disc to flexibly absorb vibration while preventing uncontrolled breakage, as cracks will propagate along predetermined paths rather than causing catastrophic failure
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 effectively improves vibration attenuation characteristics while controlling breakage mode, reducing the risk of unpredictable breakage and fragment scattering, thereby enhancing the stability and reliability of the flexible flywheel.
Implementation Method 1
The elastic spoke portions extend in the radial direction between the shaft fastening portion and the inertia ring and connect the shaft fastening portion and the inertia ring to each other. The elastic spoke portions absorb a vibration acting on the shaft by undergoing deflection.
Data Source
AI summary
A flexible flywheel includes: a shaft fastening portion fixed to an end portion of an engine crankshaft; an annular inertia ring provided around the shaft fastening portion; a plurality of elastic spoke portions that extend in the radial direction between the shaft fastening portion and the inertia ring and connect the shaft fastening portion and the inertia ring to each other, and that absorb vibration acting on the crankshaft by undergoing deflection; and weight portions provided between adjacent elastic spoke portions, side edge-side boundary ends, to which boundaries with the weight portions are connected, are provided on both sides edges of the elastic spoke portion, respectively, when the elastic spoke portions are vibrated, stress concentrates on the side edge-side boundary ends.