Fluid-Filled Vibration Damping Device With Elastic Protrusions
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Solution Overview
Problem
Conventional fluid-filled vibration damping devices experience noise and vibration issues due to the movable plate striking against the partition, with existing solutions failing to provide sufficient impact moderation.
Innovation Solution
A fluid-filled vibration damping device with a movable plate supported by a partition, featuring elastic protrusions with a peripheral wall that deforms radially inward upon contact, offering enhanced cushioning performance through shear and compression deformation, and optionally incorporating hollow annular peripheral walls and tapered surfaces for improved durability and load-deflection characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a movable plate is used in a liquid pressure absorber, then vibration damping performance is improved, but noise and vibration occur due to the movable plate striking against the partition
Solution Approach 1:
The patent applies beforehand cushioning by providing elastic protrusions on the movable plate that make contact with the partition before the main body of the movable plate strikes against it. These elastic protrusions deform elastically to absorb impact energy, preventing direct striking between the rigid movable plate and partition, thereby reducing noise and vibration while maintaining vibration damping performance
2Object-generated harmful factors
If a solid elastic protrusion is provided on the movable plate, then impact moderation is attempted, but sufficient cushioning effect cannot be obtained
Solution Approach 1:
The patent applies parameter changes by carefully designing the elastic protrusions with specific material properties, dimensions, and geometric configurations. By adjusting parameters such as the elasticity modulus, protrusion height, diameter, and shape, the cushioning performance is optimized to provide sufficient impact moderation while maintaining effective contact between the movable plate and partition for vibration damping
3Device complexity
If the peripheral wall is pressed only in compression direction, then simple deformation occurs, but cushioning performance is limited
Solution Approach 1:
The patent applies dynamics by enabling the peripheral wall of the elastic protrusions to undergo both compression deformation (radially inward) and shear deformation (tangentially). This dynamic multi-directional deformation capability allows the elastic protrusions to better absorb and dissipate impact energy, significantly improving cushioning performance while managing the complexity through elegant geometric design
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 reduces noise and vibration by enhancing the cushioning action and durability, allowing for better tuning of the damping performance and nonlinear elasticity, thereby improving the overall vibration damping effectiveness.
Implementation Method 1
the elastic protrusion includes a peripheral wall, the peripheral wall being configured to be pressed in a compression direction as well as in a shear direction and be elastically deformed to a radially inner side of the communication hole
Implementation Method 2
the movable plate receiving on one face thereof liquid pressure of the primary liquid chamber and on another face thereof liquid pressure of the auxiliary liquid chamber
Data Source
AI summary
A fluid-filled vibration damping device including: primary and auxiliary liquid chambers; a partition provided between the two chambers; and a movable plate supported movably in a plate thickness direction thereof by the partition. The movable plate receives liquid pressure of the two chambers on its opposite faces so as to constitute a liquid pressure absorber. The partition includes at least one communication hole opening onto its surface facing the movable plate. The movable plate includes at least one elastic protrusion projecting toward the communication hole. The elastic protrusion includes a peripheral wall to be pressed in compression and shear directions and be elastically deformed to a radially inner side of the communication hole as well by coming into contact with a wall portion of the communication hole due to movement of the movable plate in the plate thickness direction.