Flywheel Assembly Flexible Coupling Failure Load Management
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Solution Overview
Problem
High-speed flywheel assemblies in mobile applications face significant challenges in reducing loads during failure, which is crucial for weight reduction and robustness, especially in vehicles where weight minimization is desirable.
Innovation Solution
A flywheel assembly with a flexibly coupled inner body to the housing, allowing the flywheel to contact both inner and outer surfaces during failure, utilizing flexible polymeric materials or spring arrangements to absorb forces and reduce radial loads through precession motion and friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flywheel assembly uses a rigid mounting structure, then the structural strength and reliability are improved, but the weight of the assembly increases
Solution Approach 1:
The patent applies flexible mountings that allow controlled movement and deformation during flywheel failure. These flexible elements absorb impact forces while maintaining structural integrity, enabling weight reduction compared to fully rigid structures while still providing necessary strength during failure events.
2Reliability
If the flywheel assembly uses a rigid mounting structure, then the reliability during failure is improved, but the device complexity increases
Solution Approach 1:
The flexible mountings provide a simpler alternative to complex rigid mounting systems with multiple constraints and adjustment mechanisms. The flexibility inherently accommodates failure modes while maintaining reliability, reducing the overall complexity of the mounting structure.
3Force
If the flywheel is allowed to contact both inner and outer surfaces during failure, then the loads generated by failure are reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The flexible mountings act as compliant elements that accommodate manufacturing tolerances and clearance variations. By allowing controlled movement and deformation, they reduce the stringency of manufacturing precision requirements while still enabling the flywheel to contact both inner and outer surfaces for load distribution.
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 solution effectively minimizes the loads generated during flywheel failure by managing the precession frequency and radial forces, ensuring reduced wear and maintaining system stability while maintaining operational integrity.
Implementation Method 1
the inner body is flexibly coupled to the housing, such that if the flywheel mounting fails during rotation at speed leading to displacement of the flywheel, flexure of the coupling as a result of forces exerted on the inner body by the displaced flywheel allows the flywheel to contact the engagement surface
Implementation Method 2
Allowing the flywheel to come into contact with both inner and outer surfaces considerably reduces the loads generated by flywheel failure
Data Source
AI summary
A flywheel assembly is provided which comprises a housing, a flywheel rotatably mounted in the housing and defining an inner and an outer circumferential surface, and an inner body spaced radially and inwardly from the inner circumferential surface of the flywheel. The flywheel rotates in use around and relative to the inner body, the assembly defines an engagement surface spaced radially and outwardly from the outer circumferential surface of the flywheel, and the inner body is flexibly coupled to the housing. If the flywheel mounting fails during rotation at speed leading to displacement of the flywheel, flexure of the coupling as a result of forces exerted on the inner body by the displaced flywheel allows the flywheel to contact the engagement surface.