Antivibration Device Junction Geometry for Orthogonal Spring Constants
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Solution Overview
Problem
Existing antivibration devices face challenges in improving the durability of their base bodies, particularly in maintaining different spring constants in orthogonal directions, which affects their vibration isolation and durability.
Innovation Solution
The antivibration device design features a junction with a chamfer portion and base portion between the end and flange portions, creating a difference in spring constants between the first and second directions, and includes a stopper portion with varying rubber elastic body thicknesses to restrict relative displacement and tensile loads, enhancing durability and vibration isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the first projection plane area is made smaller than the second projection plane area to achieve different spring constants in orthogonal directions, then vibration isolation performance is improved, but distortion of the antivibration base body increases and durability deteriorates
Solution Approach 1:
The junction is designed with non-uniform geometry where the first projection plane area differs from the second projection plane area. This local variation in geometry creates different spring constants in orthogonal directions, allowing optimized vibration isolation performance while maintaining overall structural integrity through the specific configuration of the junction geometry.
Solution Approach 2:
The junction employs asymmetric geometry with different projection plane areas in orthogonal directions. This asymmetry is intentionally designed to create different stiffness characteristics along different axes, enabling the antivibration base body to provide direction-dependent vibration isolation while managing distortion through the specific asymmetric configuration.
2Adaptability or versatility
If different spring constants are implemented in two orthogonal directions to improve vibration isolation, then vibration isolation performance is enhanced, but distortion of the antivibration base body increases reducing durability
Solution Approach 1:
The junction geometry is locally optimized with different projection plane areas to create direction-specific spring constants. This local quality variation allows the antivibration base body to exhibit different stiffness characteristics in orthogonal directions, enhancing vibration isolation performance while the overall junction design manages distortion to maintain strength.
Solution Approach 2:
An asymmetric junction geometry is employed where the first projection plane area differs from the second projection plane area. This asymmetry creates the required different spring constants in orthogonal directions for improved vibration isolation, while the specific asymmetric configuration is designed to control and mitigate distortion effects on overall strength.
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 design effectively improves the durability of the antivibration base body by mitigating distortion and providing differential spring constants, leading to enhanced vibration isolation and ride quality, while maintaining existing mold usage and preventing buckling.
Implementation Method 1
an antivibration base body including a rubber elastic body
Implementation Method 2
a stopper portion including a rubber elastic body and covering a surface of the flange portion opposite to the junction
Data Source
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AI summary
[Problem] To provide an antivibration device (10,70) capable of improving the durability of an antivibration base body (50,110) with spring constants made to differ in two directions orthogonal to an axis (0). [Solution] A junction (21,81) with an antivibration base body (50,110) joined to its outer periphery is equipped with a chamfer portion (22,82) where a corner connecting a flange portion (25,85) with the junction (21,81) is removed, a base portion (23,83) connected to the chamfer portion (22,82) in the axial direction, and an end portion (24,84) connected to the base portion (23,83) in the axial direction. At the junction (21,81), a first projection plane made by projecting at least the end portion (24,84) in a first direction (X) orthogonal to the axis (O) is set to be smaller in area than a second projection plane made by projecting at least the end portion (24,84) in a second direction (Y) orthogonal to the axis (O) and the first direction (X).