Isolation Spring Bushing Assembly Shear Loading
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Solution Overview
Problem
Conventional fastener assemblies using rubber collars between metal bushings and work-pieces face issues with load degradation over time due to permanent setting and rubber degradation, leading to reduced effectiveness and potential corrosion.
Innovation Solution
A fastener assembly featuring a bushing with a flange and an isolation spring having a metal core integrally formed with a rubber coating, where the rubber coating is bonded to the metal core and subjected to shear loading instead of compression, providing enhanced durability and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubber collars are used between metal bushings and work-pieces, then vibration isolation and damping are provided, but load degradation occurs over time due to permanent setting and rubber degradation
Solution Approach 1:
The isolation spring combines a metal core (providing structural integrity and resistance to permanent set) with a rubber coating (providing vibration isolation and damping). This composite structure maintains load transfer capability over time while preserving vibration isolation properties, resolving the contradiction between reliability and service life.
Solution Approach 2:
The invention changes the loading parameter applied to the rubber material from compression (in rubber collars) to shear (in the isolation spring coating). Rubber subjected to shear loading exhibits significantly reduced permanent set and degradation, thereby maintaining load retention over extended service life while preserving vibration isolation capabilities.
2Object-affected harmful factors
If rubber collars are compressed between flanges, then isolation and damping are achieved, but the rubber permanently sets and degrades, reducing effective compression over time
Solution Approach 1:
The invention changes the stress parameter from compressive loading to shear loading for the rubber material. The rubber coating on the isolation spring is subjected to shear forces during compression, which the rubber material resists much more effectively than compressive forces. This preserves rubber integrity and prevents permanent setting while maintaining vibration isolation performance.
Solution Approach 2:
The metal core provides structural stability and load-bearing capacity, while the rubber coating provides vibration isolation. The metal core maintains its shape and dimensions under load, preventing the permanent set that would occur with pure rubber components, thereby stabilizing the overall composition while preserving damping characteristics.
3Object-affected harmful factors
If separate rubber collars are positioned between flanges and work-piece, then compression isolation is provided, but corrosion may occur due to contact between metal components and work-piece
Solution Approach 1:
The isolation spring is a single integrated composite component with a metal core and rubber coating that serves multiple functions simultaneously: the rubber coating provides corrosion protection by isolating metal surfaces, the metal core provides structural integrity, and the composite structure provides vibration isolation. This eliminates the need for separate rubber collars and simplifies the assembly while improving corrosion resistance.
Solution Approach 2:
The invention merges the functions of corrosion protection, vibration isolation, and structural support into a single isolation spring component. The rubber coating on the metal core creates a barrier against corrosion between metal bushings and work-pieces, while the integrated structure eliminates the need for separate corrosion protection elements, reducing assembly complexity.
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 solution achieves long-lasting vibration isolation and damping with minimal permanent set, preventing corrosion by eliminating galvanic cells and maintaining effective load transfer over time.
Implementation Method 1
the rubber coating may be bonded to the metal core and subjected to shear loading instead of compression
Implementation Method 2
providing enhanced durability and corrosion resistance. The solution achieves long-lasting vibration isolation and damping
Implementation Method 3
The rubber coating may be bonded to the metal core. The annular metal core and the rubber coating are integrally formed as a single unitary piece
Data Source
AI summary
A fastener assembly includes a bushing having a flange configured to be urged toward a work-piece, and an isolation spring configured to be positioned between the flange and the work-piece. The isolation spring includes a metal core integrally formed with a rubber coating.