Dynamic Damper Flow Path for Lubricant Fluidity
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Solution Overview
Problem
Existing dynamic dampers in power transmission devices face challenges in allowing lubricating liquid to flow easily due to the positioning of the mass body's inner peripheral surface, which reduces centrifugal force and fluidity of the lubricating liquid.
Innovation Solution
A dynamic damper design with a mass body and elastic body coupled to a rotation shaft, featuring flow paths between the shaft's inner peripheral surface and the mass body, enhancing centrifugal force and fluidity of lubricating liquid through the holder's slit and flat portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mass body is positioned with its inner peripheral surface inside the rotation shaft, then the dynamic damper can suppress vibration effectively, but the centrifugal force acting on lubricating liquid is reduced and fluidity is lowered
Solution Approach 1:
The flow path is repositioned from the conventional location (inside the mass body) to a new location (between the inner peripheral surface of the rotation shaft and the mass body). This spatial reconfiguration allows the lubricating liquid to flow along the inner peripheral surface of the rotation shaft where stronger centrifugal force acts, improving fluidity without compromising the mass body's vibration suppression function.
2Ease of operation
If a flow path is provided between the inner peripheral surface of the rotation shaft and the mass body, then lubricating liquid fluidity is improved, but the structural complexity increases
Solution Approach 1:
The space between the inner peripheral surface of the rotation shaft and the mass body serves multiple functions: it acts as a flow path for lubricating liquid to improve fluidity, and simultaneously maintains the structural integrity needed for vibration suppression. This multi-functional design avoids adding separate components while achieving improved lubrication.
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 improves lubricating liquid flow and fluidity within the rotation shaft, effectively lubricating bearings and damping vibrations across both resonance modes, while maintaining a lightweight and cost-effective structure.
Implementation Method 1
a dynamic damper for suppressing vibration generated by a gear attached to a rotation shaft
Implementation Method 2
an elastic body that couples the mass body to the rotation shaft
Implementation Method 3
the lubricating liquid flows along the inner peripheral surface of the rotation shaft by centrifugal force
Data Source
AI summary
A dynamic damper for suppressing vibration generated by a gear attached to a rotation shaft, the dynamic damper, includes: a mass body that is disposed inside a rotation shaft having a hollow shape and extends along a shaft center of the rotation shaft; and an elastic body that couples the mass body to the rotation shaft. Further, a flow path for lubricating liquid to flow is provided between an inner peripheral surface of the rotation shaft and the mass body, and the flow path is formed by the inner peripheral surface of the rotation shaft at an axial position where the elastic body is disposed.