Non-Circular Vibration Isolator Asymmetric Elastic Walls
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Solution Overview
Problem
Conventional engine mounts with non-circular insulators and mounting metal fittings struggle to achieve a large spring ratio difference between orthogonal directions (X and Y) and fail to improve durability effectively.
Innovation Solution
A vibration isolating device with non-circular shaped insulators and mounting metal fittings, where the X direction elastic walls are thinner and shorter, and Y direction elastic walls are thicker and longer, allowing for varying spring ratios by adjusting the restraint areas and deformation modes, and utilizing a rectangular shape to distribute stress and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the insulator and second mounting metal fitting are formed in a non-circular shape to reduce installation space, then the arrangement efficiency is improved, but the ability to achieve a large spring ratio difference between orthogonal directions deteriorates
Solution Approach 1:
The insulator is designed with asymmetric elastic wall configurations where the lengths and projected areas of elastic walls differ between orthogonal directions (X and Y directions). Specifically, the Y-direction elastic walls have greater lengths and projected areas compared to X-direction elastic walls, creating inherent directional stiffness differences that enable large spring ratio adjustment without requiring circular geometry
Solution Approach 2:
Different regions of the insulator are given different structural properties through varying the lengths and projected areas of elastic walls in specific directions. The X-direction elastic walls are designed with smaller dimensions while Y-direction elastic walls have larger dimensions, creating localized stiffness variations that achieve the desired spring ratio characteristics
2Adaptability or versatility
If the spring ratio is adjusted by changing the thickness of the insulator or restraint area in conventional non-circular designs, then the spring ratio adjustment is achieved, but the durability of the insulator is not improved
Solution Approach 1:
The insulator employs asymmetric elastic wall design where Y-direction elastic walls have greater lengths and projected areas than X-direction elastic walls. This asymmetric configuration naturally distributes stresses more favorably during operation, improving durability while simultaneously achieving the desired spring ratio characteristics without relying solely on thickness variations
Solution Approach 2:
The invention changes geometric parameters (lengths and projected areas of elastic walls) rather than solely relying on thickness changes. By varying the lengths L1 and L2 and projected areas S1 and S2 of elastic walls in different directions, the spring ratio is adjusted while maintaining optimal stress distribution patterns that enhance insulator durability
3Adaptability or versatility
If the X direction elastic walls are made thinner and shorter while Y direction elastic walls are made thicker and longer, then the spring ratio difference between directions is increased, but the structural complexity increases
Solution Approach 1:
The insulator utilizes asymmetric geometry where the fundamental shape and elastic wall configurations are inherently different between X and Y directions. This asymmetric design achieves large spring ratio differences through the natural geometric properties rather than requiring complex additional components or mechanisms, thereby limiting the increase in structural complexity
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 allows for a large spring ratio difference between X and Y directions, improving durability by distributing stress effectively and allowing for easy adjustment of spring values, while alleviating stress concentration.
Implementation Method 1
an insulator (16) providing a connection between the first and second mounting metal fittings and having an elastic wall part of non-circular shape
Data Source
AI summary
When an insulator is of non-circular shape, a spring ratio of an X direction to a Y direction is increased by utilizing this non-circular shape. A pair of direction elastic walls opposed to each other in the X direction is formed short and thin in the Y direction and has a small X direction projected area. Similarly, a second mounting metal fitting is formed in a rectangular shape extending long in the X direction and includes a pair of X direction restraint walls opposed to each other in the X direction and a pair of Y direction restraint walls opposed to each other in the Y direction. A first mounting metal fitting includes a pair of X direction restraint projecting parts opposed to each other in the X direction and a pair of Y direction restraint walls opposed to each other in the Y direction.