Dynamic Damper With Multi-Oriented Elastic Contact Surfaces
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Solution Overview
Problem
Existing dynamic dampers fail to effectively address both axial resonance and falling resonance modes generated by gear vibrations in power transmission devices, leading to inadequate damping and potential noise radiation.
Innovation Solution
A dynamic damper design featuring a mass body within a hollow rotation shaft, coupled with an elastic body that includes both parallel and non-parallel contact surfaces to induce compressive stress during axial and falling vibrations, allowing for vibration damping in both resonance modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cylindrical elastic body is used to couple the mass body to the rotation shaft, then the structure is simple and easy to manufacture, but it cannot effectively damp both axial resonance and falling resonance modes simultaneously
Solution Approach 1:
The elastic body is segmented into multiple contact surfaces with different orientations (first contact surface parallel to axial direction, second contact surface inclined relative to axial direction). Each contact surface targets a specific resonance mode, allowing the single elastic body to address both axial and falling resonance modes simultaneously while maintaining structural simplicity.
Solution Approach 2:
Different regions of the elastic body are designed with different contact surface orientations to provide localized damping properties. The first contact surface area provides damping for axial resonance, while the second contact surface area provides damping for falling resonance, creating non-uniform local quality that addresses multiple vibration modes.
2Volume of moving object
If the mass body is coupled to the rotation shaft via a cylindrical elastic body, then the structure is compact, but it fails to generate compressive stress in response to both axial and radial vibrations
Solution Approach 1:
The elastic body design transitions from a single-axis (axial) contact configuration to a multi-dimensional configuration by adding an inclined second contact surface. This dimensional change enables the elastic body to respond to both axial vibrations (first contact surface) and radial/falling vibrations (second contact surface) within the same compact structure.
3Device complexity
If a single contact surface configuration is used, then the device complexity is low, but it cannot generate compressive stress for both falling resonance and axial resonance modes
Solution Approach 1:
The elastic body is designed as a universal damping element that performs multiple functions through its multi-oriented contact surfaces. It simultaneously provides damping for axial resonance mode (via first contact surface) and falling resonance mode (via second contact surface), making a single component serve multiple vibration control functions without increasing overall device 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 dynamic damper effectively cancels both axial and falling resonance modes, reducing vibration transmission and noise radiation, while maintaining a lightweight and cost-effective structure.
Implementation Method 1
an elastic body interposed between the mass body and the rotation shaft... compressive stress acts on the elastic body by the mass body vibrating so as to push the first contact surface
Implementation Method 2
compressive stress acts on the elastic body by the mass body coming in the linear motion state in response to the vibration and vibrating so as to push the second contact surface
Data Source
AI summary
A dynamic damper includes: a mass body that is disposed inside a rotation shaft and extends along a shaft center of the rotation shaft; and an elastic body interposed between the mass body and the rotation shaft. Further, the mass body is allowed to vibrate to a linear motion state, the elastic body includes: first and second contact surfaces, when the gear generates vibration so as to fall from a radial direction of the rotation shaft to an axial direction side of the rotation shaft, compressive stress acts on the elastic body by the mass body vibrating so as to push the first contact surface in response to the vibration, and when the gear generates vibration along the axial direction, compressive stress acts on the elastic body by the mass body coming in the linear motion state and vibrating so as to push the second contact surface.