Anti-Vibration Mount Structure for Lower Spring Constant
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Solution Overview
Problem
Conventional anti-vibration devices with an elastic body located between attachment members have high spring constants in the direction they face each other, making it difficult to reduce this value sufficiently.
Innovation Solution
An anti-vibration device design featuring a first attachment member with upper and lower partition walls spaced in the up-down direction, an elastic body with a dome-shaped concavity in the second attachment member, and through holes in the elastic body, which reduces the spring constant by allowing gentle displacement and minimizing device dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the elastic body is located between the first attachment member and the second attachment member without bonding, then the structure is simpler, but the spring constant in the up-down direction becomes high
Solution Approach 1:
The patent applies curvature by forming a concavity portion with a dome-shaped curved surface in the second attachment member. This curved surface allows the elastic body to deform more easily in the up-down direction, reducing the spring constant while maintaining the simple unbonded structure. The curved geometry provides a mechanical advantage by distributing stress and enabling greater displacement for the same force.
Solution Approach 2:
The patent introduces through holes through the elastic body, creating a porous structure that reduces the overall stiffness of the elastic body in the up-down direction. The through holes allow the material to compress more easily under load, effectively reducing the spring constant while maintaining structural integrity and the simple unbonded configuration.
2Force
If the spring constant is reduced by increasing spacing between attachment members, then the spring constant decreases, but the device size increases
Solution Approach 1:
The patent applies local quality by creating localized features (concavity portion and through holes) in specific regions of the elastic body and attachment members. The concavity portion is formed only in the second attachment member at the location where the elastic body contacts it, and through holes are strategically positioned in the elastic body. These localized modifications reduce the spring constant without requiring overall increases in device dimensions.
Solution Approach 2:
The patent changes physical parameters of the elastic body and attachment members, specifically introducing geometric features (concavity with dome-shaped surface and through holes) that alter the mechanical properties. These parameter changes enable reduced stiffness in the up-down direction while maintaining compact overall dimensions, avoiding the need to increase spacing between attachment members.
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 design effectively reduces the spring constant between the attachment members without increasing the device's size, allowing for improved vibration absorption and reduced stiffness in the desired direction.
Implementation Method 1
an elastic body located between the first attachment member and the second attachment member
Data Source
Figure 1
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AI summary
Provided is an anti-vibration device that can reduce the spring constant. An anti-vibration device comprises: a first attachment member (10) configured to be connected to one of a vibration generating portion and a vibration receiving portion; a second attachment member (20) configured to be connected to an other one of the vibration generating portion and the vibration receiving portion; and an elastic body (30) located between the first attachment member (10) and the second attachment member (20), wherein the first attachment member (10) has a first recess (13) in which one end portion (31) of the elastic body (30) is housed, the second attachment member (20) has a second recess (23) in which an other end portion (32) of the elastic body (30) is housed, and a concavity portion (25) forming a space (S1) with the elastic body (30) is formed in at least one of the first recess (13) and the second recess (23).