Anti-Vibration Structure with Pre-Compressed Multi-Layered Plates
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Solution Overview
Problem
Conventional anti-vibration structures experience stress concentration at the radial center due to twisting deformation, reducing the durability of the rubber body.
Innovation Solution
A multi-layered material with alternating hard and soft plates, featuring a separate inner elastic body and a restricting member that pre-compresses the structure, preventing separation of plates and enhancing compression springiness, thereby alleviating stress concentration and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end plates are coupled together by a chain link embedded in the rubber body, then the structure provides vibration damping and support, but twisting deformation occurs under random direction vibration, causing stress concentration at the radial center portion and reduced durability
Solution Approach 1:
The invention divides the rubber body into multiple independent rubber layers separated by metal plates. This segmentation allows each rubber layer to deform independently under twisting loads, preventing stress concentration at the radial center portion and improving overall durability.
Solution Approach 2:
The invention uses a composite structure combining rigid metal plates with viscoelastic rubber layers. The metal plates provide structural support and distribute stresses, while the rubber layers provide vibration damping. This composite approach prevents the stress concentration that occurs in homogeneous rubber structures.
2Strength
If the multi-layered material is pre-compressed by the restricting member, then compression springiness is improved, but the structure becomes more complex
Solution Approach 1:
The restricting member applies pre-compression to the multi-layered material during assembly, setting the rubber layers in a pre-compressed state. This preliminary action improves compression springiness and vibration damping performance without requiring complex active control systems.
Solution Approach 2:
The pre-compressed structure automatically adjusts to vibration loads through the elastic deformation of rubber layers and the bending of the restricting member. This self-adjusting mechanism improves compression springiness without requiring external control systems, maintaining structural simplicity.
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 effectively reduces stress concentration at the radial center during twisting deformation, enhances the durability of the anti-vibration structure, and improves its compression springiness when subjected to vibrations.
Implementation Method 1
a multi-layered material in which plural rigid hard plates and plural soft plates with viscoelastic properties are layered alternately to each other
Implementation Method 2
soft plates with viscoelastic properties such as rubber are layered alternately to each other. In such anti-vibration structures, supporting rigidity is increased by the hard plates, and vibration generated by the vibration generating section is prevented, dampened, and absorbed by the soft plates undergoing elastic deformation
Implementation Method 3
the multi-layered material is pre-compressed by the restricting member; and an outer circumferential face of the inner elastic body and an inner circumferential face of the multi-layered material abut each other without a gap due to the pre-compression
Data Source
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AI summary
An anti-vibration structure 10 includes an inner elastic body that is a separate body to a multi-layered material and that is disposed in a through-hole piercing through a layering direction of the multi-layered material, and a restricting member that has at least a portion embedded in the inner elastic body, that has one end coupled to an upper plate and another end coupled a lower plate and that restricts separation of the upper plate and the lower plate.