Bush Seat Geometry for Higher Lateral Spring Constant
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Solution Overview
Problem
Existing anti-vibration devices face challenges in improving the static spring constant of a bush in the axially perpendicular direction while minimizing the increase in volume, as flat axial end surfaces and overhanging inner circumferential surfaces often result in increased volume without significant impact on the static spring constant.
Innovation Solution
The anti-vibration device features a bush with inclined seats on its axial end surfaces, allowing for increased contact area between the outer and inner circumferential surfaces, thereby enhancing the static spring constant while maintaining a suppressed volume increase. These seats are designed to spread outwardly toward the outer circumferential surface, optimizing the compressive deformation and reducing axial sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the axial end surface of the bush is made flat, then the manufacturing is simplified, but the static spring constant in the axially perpendicular direction is reduced
Solution Approach 1:
The invention applies local quality by creating an inclined surface only in the specific region where it is needed to improve the static spring constant. The inclined surface is formed on the axial end surface at a position radially outward from the through hole, creating a localized structural modification that enhances performance without requiring the entire end surface to be complex. This localized inclination increases the contact area with the outer circumferential surface, thereby improving the static spring constant while maintaining simplicity elsewhere in the structure.
2Stability of the object's composition
If the inner circumferential surface overhangs axially outward, then the structural integrity is improved, but the volume of the bush increases
Solution Approach 1:
The invention applies partial action by creating an overhang only in the specific region where structural integrity is needed, rather than overhanging the entire inner circumferential surface. The overhang is formed at the axial end surface at a position radially outward from the through hole, providing localized structural support. This partial overhang improves structural integrity while minimizing the volume increase compared to a complete overhang of the inner circumferential surface.
3Strength
If the contact area between outer circumferential surface and second component is increased, then the static spring constant is improved, but the bush volume increases
Solution Approach 1:
The invention applies curvature by forming an inclined surface that creates a tapered or curved contact region between the axial end surface and the outer circumferential surface. This inclined geometry allows the contact area to increase gradually toward the outer circumferential surface, improving the static spring constant through enhanced contact without requiring a uniform increase in bush volume. The curved inclined surface optimizes the distribution of contact pressure and maximizes the effective contact area within minimal volume constraints.
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 effectively improves the static spring constant of the bush in the axially perpendicular direction while preventing excessive volume expansion, allowing for better vibration absorption and reduced axial sliding, thus balancing performance and size constraints.
Implementation Method 1
an anti-vibration device that connects an axial first component such as a stabilizer bar and a cylindrical second component such as a bracket to each other with a cylindrical bush made of an elastic body
Implementation Method 2
the bush is compressed in the axially perpendicular direction while the outer circumferential surface of the bush contacts with the second component
Data Source
AI summary
An anti-vibration device is provided to enable improvement in a static spring constant of a bush in an axially perpendicular direction while suppressing an increase in a volume of the bush. A lower seat is formed to a position downward relative to a through hole on an axial end surface of a bush. The lower seat axially outwardly inclines downward to the outer circumferential surface of the bush. This lower seat enables suppression of an increase in a volume of the bush and improvement of a static spring constant of the bush relative to downward compressive deformation.