Bracket-Clamped Bush Structure for Higher Lateral Spring Constant
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Solution Overview
Problem
Existing anti-vibration bushes experience a decrease in static spring constant in the direction orthogonal to the axis due to displacement at corner portions when a load is applied, leading to potential noise and reduced durability.
Innovation Solution
The bush design includes horizontal bases projecting outward from the bottom and side surfaces to restrict displacement, embedding corner portions and suppress compression, thereby increasing the static spring constant in the orthogonal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the outer peripheral surface of the bush is set along the clamping surface portions and the assembling surface, then the bush can be securely positioned and clamped, but corner portions extend away from the bush due to bracket bends, causing displacement when load is applied and decreasing the static spring constant in the orthogonal direction
Solution Approach 1:
The horizontal bases are pre-formed to project outward from the bottom and side surfaces, creating a preliminary geometric configuration that prevents corner displacement before load is applied. This preliminary structural arrangement ensures that when the bracket is bent and clamping surfaces are formed, the bush corners are already constrained by the projecting horizontal bases, preventing the displacement that would otherwise occur and maintain the static spring constant.
Solution Approach 2:
The horizontal bases extend the bush structure in a radial dimension outward from the cylindrical body, creating a three-dimensional configuration where the bases project beyond the original cylindrical surface. This dimensional extension allows the bases to physically occupy the space where displaced corners would escape, constraining them in the orthogonal direction while maintaining clamping stability.
2Ease of manufacture
If the bracket includes bends to form attaching portions, then the bracket can be attached to the assembling surface, but corner portions extend away from the bush, allowing displacement and reducing durability
Solution Approach 1:
The horizontal bases are pre-formed on the bush before assembly, creating a preliminary constraint structure that will prevent corner displacement during subsequent bracket bending and attachment operations. This preliminary geometric configuration ensures durability is maintained throughout the manufacturing and service lifecycle.
Solution Approach 2:
The projecting horizontal bases act as a protective cushion or barrier that prevents the corner portions from displacing outward when the bracket is bent and attached. This beforehand protective structure absorbs or prevents the harmful displacement effect, ensuring the bush maintains its structural integrity and durability during assembly and operation.
3Adaptability or versatility
If corner portions are allowed to displace to escape positions, then the bush can accommodate deformation, but the static spring constant decreases and noise and wear increase
Solution Approach 1:
The horizontal bases are pre-formed to project outward, creating a preliminary constraint that guides deformation within acceptable limits rather than allowing uncontrolled corner displacement. This preliminary structural arrangement enables the bush to accommodate necessary elastic deformation while preventing the excessive corner escape that generates noise and wear.
Solution Approach 2:
The horizontal bases, which initially appear to add structural complexity, actually convert the potential harm of corner displacement into beneficial controlled deformation. By providing a predetermined geometric constraint, the bases transform what would be harmful uncontrolled corner escape into beneficial elastic deformation within the horizontal base structure itself, reducing noise and wear while maintaining adaptability.
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 design enhances the static spring constant in the orthogonal direction while reducing torsion spring constant-related noise and wear, ensuring durability and efficient assembly.
Implementation Method 1
a bush whose static spring constant in a direction orthogonal to an axis can be increased by restricting displacement of the bush
Data Source
AI summary
A bottom surface of a bush is in close contact with a planar assembling surface, and two side surfaces of the bush are in close contact with two clamping surface portions of a bracket that is attached to the assembling surface. The bush includes two horizontal bases where corners provided at the bottom surface and at the two side surfaces are caused to project outward in a clamping direction with respect to extension lines of the side surfaces in a cross section perpendicular to an axial direction of the bush.