Frustoconical Rubber Vibration Damping Device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vibration damping devices with rubber elastic bodies of frustoconical shape face issues with tensile stress during rebound load, leading to reduced endurance and vibration damping performance, and sealed fluid devices experience constraining forces and bubble formation causing noise and ineffective damping.
Innovation Solution
A vibration damping device with a rubber elastic body of frustoconical shape, a retainer member, a first mounting member, a second mounting member, and a rebound stopper mechanism, where the stopper rubber absorbs shocks and restricts relative displacement, reducing tensile stress and maintaining consistent deformation, and in sealed fluid devices, the retainer member helps in inducing pressure variations to prevent bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rubber elastic body of frustoconical shape is used in a vibration damping device, then load bearing performance and endurance are improved under initial load, but tensile stress during rebound direction load causes cracking and reduced endurance
Solution Approach 1:
The invention divides the rubber elastic body into functionally distinct segments: a large-diameter portion that primarily bears compressive loads and a small-diameter portion that accommodates rebound deformation. This segmentation allows each region to handle specific stress types optimally, preventing tensile stress concentration that would cause cracking and improving overall reliability under cyclic loading conditions.
2Reliability
If a sealed fluid type vibration damping device is used, then vibration damping action is achieved through fluid flow, but non-compressible fluid exerts constraining force on the rubber elastic body during large rebound load, diminishing damping performance
Solution Approach 1:
The invention applies local quality by creating a specific region (the small-diameter portion) with different mechanical properties and deformation characteristics compared to the large-diameter portion. This localized design allows the small-diameter region to undergo controlled elastic deformation during rebound, accommodating volume changes without generating excessive constraining forces on the rubber elastic body, thereby maintaining damping performance.
3Reliability
If non-compressible fluid is sealed in the fluid chamber, then vibration damping through fluid flow is achieved, but dissolved air separates and forms bubbles under large rebound load, causing noise and shock
Solution Approach 1:
The invention employs preliminary action by pre-designing the small-diameter portion with specific elastic characteristics that anticipate and accommodate volume changes during rebound. This pre-configured elastic region prevents excessive negative pressure development in the fluid chamber, thereby preventing dissolved air from separating and forming bubbles before they can cause noise and shock during operation.
4Reliability
If bubbles form in the sealed fluid, then pressure changes within the fluid chamber are ineffective, but the intended vibration damping characteristics are not obtained
Solution Approach 1:
The invention utilizes parameter changes by designing the small-diameter portion to undergo controlled elastic deformation that modulates the fluid chamber volume in response to rebound loads. This dynamic volume adjustment maintains optimal pressure conditions within the fluid chamber, ensuring effective pressure changes and vibration damping characteristics are preserved across varying operating conditions without bubble formation.
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 enhances the endurance and load-bearing capability of the rubber elastic body, reduces noise and shock, and maintains effective vibration damping performance by minimizing tensile stress and bubble-related issues, ensuring stable and consistent vibration damping action.
Implementation Method 1
a rubber elastic body having a generally frustoconical shape overall... the first mounting member and the second mounting member are elastically coupled directly by the rubber elastic body
Implementation Method 2
a stopper rubber... so that when the first mounting member is caused to undergo relative displacement in the axial direction from its separated position towards the retainer member, a shock produced at a time when an abutting face of the first mounting member comes into contact with the open end face of the retainer member is absorbed by means of the stopper rubber
Data Source
AI summary
A vibration damping device wherein a stopper rubber disposed between opposing faces of a first mounting member and the retainer member so as to project from one of the opposing faces to the other. When the first and second mounting members undergoes relative displacement axially towards each other, a shock produced at a time when an abutting face of the first mounting member comes into contact with the open end face, i.e., an abutting face of the retainer member absorbed by the stopper rubber coming into contact with the other one of the opposing faces until the first mounting member comes into contact with the open end face of the retainer member. A receiving space is disposed between the opposing faces of the first mounting member and the retainer member so that the stopper rubber is accommodated in an elastically compressive-deformed state within the receiving space when the abutting faces contact together.