Asymmetric Orifice Vibration Isolation Device
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Solution Overview
Problem
Conventional vibration isolation devices cannot achieve a larger damping force when a rebound load is input compared to a bound load, and vice versa, limiting their effectiveness in absorbing vibrations.
Innovation Solution
A vibration isolation device with a cylindrical design featuring a partition member that differentiates flow resistance in the main and sub liquid chambers through varying orifice passage configurations, allowing for enhanced damping forces based on the direction of liquid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional vibration isolation device with equal orifice passages is used, then the structure is simple, but the damping force cannot be differentiated between rebound load and bound load
Solution Approach 1:
The patent applies local quality by creating different flow resistance characteristics in different portions of the same orifice passage. The passage is divided into a first portion and a second portion with different cross-sectional areas, allowing the liquid chamber to exhibit different damping characteristics during extension (rebound load) versus compression (bound load) phases of vibration cycles.
Solution Approach 2:
The patent implements asymmetry by designing the orifice passage with non-uniform cross-sectional area along its length. The first portion has a different cross-sectional area than the second portion, creating asymmetric flow resistance that generates higher damping forces during rebound loads compared to bound loads, thereby resolving the limitation of conventional symmetric designs.
2Force
If the flow resistance in the orifice passage is increased to enhance damping force, then the damping force increases, but the liquid flow is restricted which may cause cavitation
Solution Approach 1:
The patent applies dynamics by creating a variable flow resistance system where the effective resistance changes based on the direction and magnitude of liquid flow. During rebound loads, the asymmetric orifice passage configuration provides higher resistance to generate damping force, while during bound loads, the resistance is lower to maintain adequate liquid flow and prevent cavitation, thus dynamically adapting to different operating conditions.
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 a higher damping force when a rebound load is input compared to a bound load, increasing the ratio of damping forces and effectively suppressing cavitation and vibration transmission.
Implementation Method 1
a flow resistance of a liquid in a portion positioned on the main liquid chamber side and a flow resistance of a liquid in a portion positioned on the sub liquid chamber side are different from each other in the first orifice passage
Implementation Method 2
an elastic body connecting the first mounting member and the second mounting member
Implementation Method 3
a damping force generated when a rebound load is input can be made larger than a damping force generated when a bound load is input
Data Source
AI summary
A partition member (217) of the present invention includes a membrane (231) which forms a part of a partition wall of a main liquid chamber (215), and a first orifice passage (221) which communicates with the main liquid chamber (215) and opens toward a sub liquid chamber (216), and a flow resistance of a liquid in a portion positioned on the main liquid chamber (215) side and the flow resistance of a liquid in a portion (221a) positioned on the sub liquid chamber (216) side are different from each other in the first orifice passage (221).