Frustoconical Rubber Mount With Recessed Protrusion for Resonance Damping
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Solution Overview
Problem
Conventional vibration damping devices using rubber elastic bodies often experience deterioration in vibration damping ability at specific frequency ranges due to resonance phenomena, and mass protrusions intended to mitigate this can adversely affect the spring characteristics and durability of the rubber.
Innovation Solution
A vibration damping device featuring a frustoconical rubber elastic body with a recess and a vibration-damping protrusion that is integrally formed with the rubber bottom part, positioned away from the connection direction of the attachment members, which enhances vibration damping action in specific frequency ranges while minimizing adverse effects on the device's characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mass protrusion is provided in the center portion of the rubber elastic body to minimize resonance amplitude, then vibration damping ability in specific frequency range is improved, but spring characteristics and durability are adversely affected
Solution Approach 1:
The invention extracts the mass protrusion from the center portion of the rubber elastic body and relocates it to the bottom surface. This separation allows the protrusion to function as a vibration damping element without interfering with the spring characteristics of the main body, thereby resolving the contradiction between vibration damping ability and durability
Solution Approach 2:
The invention changes the position of the mass protrusion from the internal center portion to the external bottom surface, effectively moving the solution to another dimension (spatial relocation). This allows the protrusion to provide vibration damping functionality while avoiding adverse effects on the spring characteristics and durability of the rubber elastic body
2Reliability
If a mass protrusion is provided in the center portion of the rubber elastic body to address resonance, then resonance amplitude is minimized, but deformation characteristics are significantly influenced
Solution Approach 1:
The mass protrusion is extracted from the center portion where it would significantly influence deformation characteristics, and relocated to the bottom surface. This allows resonance control to be achieved while maintaining stable deformation characteristics of the rubber elastic body
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 improves vibration damping ability in specific frequency ranges by utilizing the vibration-damping protrusion's action without compromising the inherent spring characteristics or durability of the rubber elastic body.
Implementation Method 1
deterioration in vibration damping ability is caused by resonance phenomenon of the rubber elastic body or the like
Implementation Method 2
a main rubber elastic body connecting the first attachment member and the second attachment member
Data Source
AI summary
A vibration damping device including: a first attachment member and a second attachment member disposed apart from each other; and a main rubber elastic body connecting the first attachment member and the second attachment member, the main rubber elastic body being of a frustoconical-like shape having an outer peripheral surface whose diameter gradually increases from the first attachment member toward the second attachment member, the main rubber elastic body including a recess opening onto a center portion thereof on a large-diameter side that is a second attachment member side, and the main rubber elastic body that constitutes a bottom part of the recess integrally including a vibration-damping protrusion protruding into the recess.