Vibration Damping Device Thick-Walled Rubber Bonding
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Solution Overview
Problem
Conventional vibration damping devices face challenges in maintaining durability and tuning spring characteristics due to stress concentration on small-diameter portions of the main rubber elastic body, which can lead to deformation, cracking, and reduced vibration damping efficiency.
Innovation Solution
The vibration damping device incorporates an inner recess on the first mounting member, making the small-diameter portion of the main rubber elastic body thick-walled and radially outward projecting, which disperses stress and enhances durability, allowing for greater freedom in tuning spring characteristics by efficiently transmitting downward forces and facilitating elastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the leg base has a tapered shape with smaller diameter at the upper portion, then the structure is compact and easier to manufacture, but stress concentrates on the small-diameter portion causing deformation and cracking that reduces durability
Solution Approach 1:
The patent applies local quality by providing a thick-walled structure specifically at the small-diameter portion where stress concentrates. The wall thickness at this location is made larger than at other portions, creating localized reinforcement exactly where needed to prevent deformation and cracking, while maintaining the overall tapered compact shape for ease of manufacture.
2Reliability
If an inner-tube recess is provided to prevent deformation of the leg base, then durability is improved, but transmission of input force from the projecting parts to the leg base is reduced, limiting tuning freedom of spring characteristics
Solution Approach 1:
The patent provides local quality through selective bonding: the thick-walled small-diameter portion is bonded to the inner-tube recess to prevent deformation, while the large-diameter portion remains unbonded to maintain flexibility for force transmission. This localized bonding approach preserves both durability and tuning freedom.
Solution Approach 2:
The patent segments the leg base into two functional zones: a thick-walled small-diameter portion for structural integrity and durability, and a thinner large-diameter portion for elastic deformation and force transmission. This segmentation allows each zone to perform its specific function optimally.
3Reliability
If the small-diameter portion is made thick-walled by bonding to the inner recess, then stress concentration is reduced and durability is improved, but the structure becomes more complex
Solution Approach 1:
The patent applies the nesting principle by placing the thick-walled small-diameter portion inside the inner-tube recess of the first mounting member. The small-diameter portion is essentially nested within the recess structure, which provides both structural support and bonding interface, reducing the need for additional external reinforcement components.
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 configuration improves the durability and vibration damping performance by reducing stress concentration and enabling effective elastic deformation, thereby achieving a high degree of freedom in tuning spring characteristics and maintaining desired vibration damping ability.
Implementation Method 1
When a vibration in the axial direction is input across the inner tube and the outer tube, vibration damping ability will be exhibited by elastic deformation of the leg base.
Implementation Method 2
the thickness dimension is greatly obtained. This may disperse the stress at the small-diameter portion, thereby improving durability of the main rubber elastic body.
Data Source
AI summary
A vibration damping device including a main rubber elastic body elastically connecting first and second mounting members. An upper portion of the main rubber elastic body constitutes a small-diameter portion to which the first mounting member is bonded, while a lower portion thereof constitutes a large-diameter portion to which the second mounting member is bonded. The first mounting member includes an inner recess opening onto an outer circumferential surface thereof, and the small-diameter portion of the main rubber elastic body is bonded to the inner recess. The main rubber elastic body has an outside diameter dimension made larger at a portion bonded to the inner recess than an outside diameter dimension of the first mounting member at a lower side than the inner recess such that the small-diameter portion of the main rubber elastic body is thick-walled by being bonded to the inner recess.