Liquid Sealed Vibration Isolator Stopper Leg Design
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Solution Overview
Problem
Existing liquid sealed vibration isolating devices for engine mounts face challenges in efficiently controlling negative pressure in primary liquid chambers to prevent cavitation, particularly in scenarios requiring multifunctional capabilities for both cavitation relief and hydraulic fluid passage management, with limitations in compressibility of stopper leg portions restricting damping force enhancement.
Innovation Solution
A liquid sealed vibration isolating device featuring a stopper leg portion with a substantially L-shaped cross section that moves to open and close a second passage between primary and secondary liquid chambers, utilizing a frame member to adjust the passage's openness and incorporating a rigid ring for increased compressibility and damping efficiency, allowing for effective hydraulic liquid flow to manage cavitation and vibration absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stopper leg portion is used to control deformation of the elastic diaphragm, then the spring of the elastic diaphragm is increased and damping force is enhanced, but the compressibility of the stopper leg portion is limited which restricts further damping enhancement
Solution Approach 1:
The stopper leg portion is divided into a rigid ring (non-compressible portion) and an elastic member (compressible portion). This segmentation allows the rigid ring to provide structural support and deformation control while the elastic member provides compressibility for damping enhancement, resolving the contradiction between strength and adaptability.
Solution Approach 2:
The stopper leg portion combines a rigid ring (made of rigid material) with an elastic member (made of elastic material) to form a composite structure. This composite design enables both the rigidity needed for deformation control and the compressibility needed for enhanced damping force.
2Power
If the stopper leg portion is compressed by the frame member, then the spring of the elastic diaphragm is increased and resonance efficiency is raised, but the structure becomes more complex
Solution Approach 1:
The stopper leg portion is integrally formed with the partition member, merging two components into one. This integration simplifies the overall structure while maintaining the functionality of both the partitioning and the deformation control features.
Solution Approach 2:
The stopper leg portion serves multiple functions: it controls the deformation of the elastic diaphragm, provides compression to increase spring, and enhances damping force. This multi-functionality reduces the need for additional components, thereby simplifying the overall structure.
3Reliability
If a second passage is provided for direct hydraulic liquid flow to rapidly control negative pressure, then cavitation prevention is improved, but the device complexity increases
Solution Approach 1:
The stopper leg portion serves dual functions: it controls the deformation of the elastic diaphragm and simultaneously acts as a valve to open or close the second passage. This multi-functionality allows rapid negative pressure control without adding separate valve mechanisms, thereby preventing cavitation without significantly increasing device complexity.
Solution Approach 2:
The stopper leg portion automatically opens or closes the second passage in response to the deformation of the elastic diaphragm, without requiring external control mechanisms. This self-service capability simplifies the control system while ensuring reliable cavitation prevention.
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 enables easy opening and closing of the hydraulic liquid passage, enhances damping force through increased compressibility of the stopper leg portion, and effectively prevents cavitation by rapidly controlling negative pressure in the primary liquid chamber, thereby improving vibration isolation and resonance efficiency.
Implementation Method 1
an elastic diaphragm portion being provided on at least a portion of the partition member and elastically deformable to absorb a change in the internal pressure of the primary liquid chamber
Implementation Method 2
the stopper leg portion is compressed by the frame member to increase the spring of the elastic diaphragm
Implementation Method 3
the hydraulic liquid is allowed to flow through the second orifice and from the secondary liquid chamber to another secondary liquid chamber so as to control the negative pressure within the primary liquid chamber
Implementation Method 4
the amount of the hydraulic liquid in the primary liquid chamber, which is supplied to the damping orifice passage, is increased so as to raise resonance efficiency of liquid column resonance thereby increasing the damping force
Implementation Method 5
increasing the damping force
Data Source
AI summary
A partition member for partitioning a primary liquid chamber and a secondary liquid chamber is provided with a damping orifice passage and an elastic partition member. A stopper leg portion is integrally formed with and projects from a lower wall of an elastic diaphragm portion provided in a central region of the elastic partition member 30 so as to be pressed on a pressed surface of a support wall of a frame member. A third liquid chamber is defined by the support wall, the elastic partition member and the stopper leg portion and is opened in the vicinity of a primary liquid chamber side opening of the damping orifice passage through a relief passage. The pressed surface is increased in diameter as it goes upward.