Tubular Antivibration Mount Structure for Directional Spring Tuning
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Solution Overview
Problem
Conventional tubular antivibration devices face challenges in achieving a consistent spring ratio across directions, particularly in setting a low spring constant in the vertical direction without compromising durability and load support, as reducing the lateral width of the elastic rubber joining leg can lead to buckling and inadequate spring constants in other directions.
Innovation Solution
The tubular antivibration device features a novel structure with groove-shaped recesses and stopper protrusions that allow for differential spring constant tuning in each direction, using first and second elastic joining parts to manage vertical, lateral, and axial vibrations, while maintaining durability through controlled deformation and displacement limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the lateral width of the joining leg part is reduced to lower the vertical spring constant, then the vertical spring constant is reduced, but buckling occurs and durability deteriorates
Solution Approach 1:
The elastic rubber main body is divided into two functional segments: the first elastic joining part (vertical direction) and the second elastic joining part (lateral direction). The first joining part has a reduced lateral width to achieve low vertical spring constant, while the second joining part maintains sufficient width to prevent buckling and ensure durability. This segmentation allows each part to be optimized for its specific function without compromising the other.
Solution Approach 2:
Different regions of the elastic rubber main body are given different local properties: the first elastic joining part is designed with narrow lateral width for vertical vibration isolation, while the second elastic joining part is designed with sufficient lateral width for lateral stability and buckling prevention. This local quality differentiation resolves the contradiction between low vertical spring constant and durability.
2Force
If the entire elastic rubber main body is compressed and deformed to achieve vertical vibration isolation, then the spring constant in vertical direction is high, but it is difficult to achieve low spring constant when required
Solution Approach 1:
The elastic rubber main body is divided into two separate joining parts with distinct functional roles. The first elastic joining part is specifically designed for vertical vibration isolation with narrow lateral width to achieve low spring constant, while the second elastic joining part maintains structural integrity. This segmentation provides adaptability to achieve low vertical spring constant when required, resolving the contradiction between high and low spring constant requirements.
Solution Approach 2:
Different regions of the elastic rubber main body are designed with different local properties: the first elastic joining part has narrow lateral width for low vertical spring constant, while the second elastic joining part has sufficient width for structural support. This local quality differentiation enhances the ability to tune spring ratios in different directions according to specific application requirements.
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
This configuration enables flexible tuning of the spring ratio in each direction, reducing the spring constant in the vertical direction while maintaining high spring constants in the lateral and axial directions, thereby enhancing durability and load support performance.
Implementation Method 1
an elastic rubber main body integrally includes a pair of upper and lower first elastic joining parts joining vertically opposing surfaces of the inner axial member and the outer tubular member to each other
Data Source
AI summary
A tubular antivibration device includes an inner axial member and an outer tubular member that are joined by an elastic rubber main body. The inner axial member is provided with a pair of groove-shaped recesses that open on the outer peripheral surface on both sides in the lateral direction and extend in the vertical direction, and the elastic rubber main body is integrally provided with a pair of upper and lower first elastic joining parts that join the vertically opposing surfaces of the inner axial member and the outer tubular member to each other on both sides in the vertical direction and a pair of left and right second elastic joining parts that join the vertically opposing surfaces of the outer tubular member to each other through the pair of groove-shaped recesses of the inner axial member.