Fluid-Filled Vibration-Damping Device with Orthogonal Chamber Rigidity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluid-filled cylindrical vibration-damping devices face challenges in achieving effective vibration damping across multiple directions due to uniform arrangement of fluid chambers, which limits the ability to set different spring constants and tune for optimal damping characteristics, especially in principal vibration input directions.
Innovation Solution
A fluid-filled cylindrical vibration-damping device with a novel construction featuring unequal-sized fluid chambers and strategically positioned orifice passages, allowing for different spring rigidities in perpendicular directions, and a stopper mechanism to prevent excessive deformation and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform fluid chamber arrangement is used, then manufacturing is simplified, but optimal vibration damping characteristics cannot be tuned for principal vibration input directions
Solution Approach 1:
The patent applies local quality by making different parts of the fluid chamber system have different properties. Specifically, certain fluid chambers are designed with different shapes, sizes, or positions to provide locally optimized damping characteristics for principal vibration input directions. This allows the device to achieve both manufacturing feasibility and precise tuning of vibration damping characteristics by varying local chamber properties rather than requiring complete uniformity.
2Reliability
If fluid chambers are configured for optimal damping in principal vibration direction, then damping effectiveness improves, but the device may suffer from excessive deformation and reduced durability
Solution Approach 1:
The patent applies beforehand cushioning by incorporating a stopper mechanism that prevents excessive deformation of the fluid chambers before damage can occur. The stopper is positioned in advance within the chamber structure to limit the maximum displacement during vibration cycles. This protective feature is built into the design from the outset, allowing the chambers to be optimized for damping effectiveness while the stopper simultaneously protects against excessive deformation that would reduce durability.
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 device achieves improved vibration damping capabilities by optimizing spring rigidities and preventing damage through the stopper mechanism, effectively damping vibrations in various directions and enhancing durability.
Implementation Method 1
Fluid-filled cylindrical vibration-damping devices generally have a construction which includes a pair of fluid chambers opposed to each other in one diametrical direction (which coincides with the principal vibration input direction), and an orifice passage connecting the pair of fluid chambers with one another. On the basis of relative pressure differential arising between the pair of fluid chambers, fluid flow will be produced through the orifice passage and vibration damping action will be attained on the basis of resonance action etc. of the fluid.
Implementation Method 2
an inner shaft member adapted to be mounted to one component of the vibration transmission system and an outer cylindrical member spaced apart peripherally outward from the inner shaft member are elastically connected with each other by a main rubber elastic body
Data Source
AI summary
A fluid-filled cylindrical vibration-damping device including a main rubber elastic body elastically connecting an inner shaft member and an outer cylindrical member with each other. A pair of first fluid chambers are formed on diametrically opposite sides of the inner shaft member and a pair of second fluid chambers are formed being diametrically opposed to each other such that an opposing direction of the second fluid chambers is orthogonal to an opposing direction of the first fluid chambers. Each partition wall that partitions the first fluid chamber and the second fluid chamber extends in a direction in more proximity to the opposing direction of the first fluid chambers than to the opposing direction of the second fluid chambers so that spring rigidity as measured in the opposing direction of the first fluid chambers is set greater than spring rigidity as measured in the opposing direction of the second fluid chambers.