Segmented Intermediate Plate for Vibration-Damping Device Durability
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Solution Overview
Problem
Conventional vibration-damping devices with rubber bushes experience reduced durability due to increased spring force and deformation when subjected to prying forces, leading to premature aging and decreased durability, especially at the axial end portions.
Innovation Solution
A vibration-damping device with an inner and outer cylinder, a rubber elastic body, and an intermediate member featuring cutout parts on both end sides of the outer cylinder, which couples the rubber elastic body inside and outside the intermediate member, reducing compressive deformation and enhancing durability by allowing point symmetry and mutual facing arrangements of coupling parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rubber elastic body is made thinner to reduce deformation, then the device size is reduced, but the durability decreases due to increased stress concentration
Solution Approach 1:
The intermediate member is divided into multiple segments along the axial direction with cutout parts, creating multiple coupling regions. This segmentation allows the rubber elastic body to be effectively distributed across multiple support zones, reducing stress concentration in any single thin region while maintaining overall compactness.
Solution Approach 2:
The intermediate member acts as a mediator between the inner and outer cylinders, providing structural support and distributing loads through its cutout parts. This intermediary structure enables the rubber elastic body to maintain durability even when thinner by transferring and dispersing mechanical stresses through the intermediate member's multiple coupling points.
2Reliability
If the rubber elastic body is made thinner to enhance vibration absorbability, then the device becomes more effective at damping, but the spring force increases leading to premature aging
Solution Approach 1:
By segmenting the intermediate member into multiple sections with cutout parts, the vibration damping function is distributed across multiple zones. This allows the rubber elastic body to maintain thin dimensions for enhanced vibration absorbability while the segmented structure prevents premature aging by distributing mechanical stresses and reducing spring force concentration.
Solution Approach 2:
The cutout parts are strategically positioned at specific locations along the axial direction, creating localized coupling regions with different structural properties. This local quality variation allows the rubber elastic body to be thin in vibration-critical areas while having reinforced support at specific zones to reduce overall spring force and prevent premature aging.
3Stability of the object's composition
If the intermediate member is designed with cutout parts to couple rubber elastic body regions, then compressive deformation is restrained, but the device complexity increases
Solution Approach 1:
The intermediate member is segmented into multiple sections with cutout parts that create discrete coupling regions. This segmentation approach restrains compressive deformation by providing multiple localized support points along the axial direction, while the modular segmented design actually simplifies manufacturing compared to a fully continuous complex structure.
Solution Approach 2:
The intermediate member utilizes a thin-walled cylindrical structure with cutout parts that provides flexible yet effective coupling between rubber elastic body regions. This thin-film approach restrains compressive deformation through its geometric configuration rather than requiring thick rigid walls, thereby reducing overall device 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
The solution effectively restrains compressive deformation and improves durability by expanding the movable space for the inner cylinder, allowing for better absorption of prying forces and enhanced vibration absorbability while downsizing the device.
Implementation Method 1
the rubber elastic bodies elastically deform, which prevents the loads from being transferred from the wheels to the vehicle body
Implementation Method 2
vibration-damping device having a rubber elastic body interposed between an inner cylinder and an outer cylinder
Data Source
AI summary
The present invention provides a vibration-damping device having an inner cylinder, an outer cylinder arranged at a distance on an outer diameter side of the inner cylinder, a rubber elastic body interposed between the inner cylinder and the outer cylinder for elastically coupling the inner cylinder and the outer cylinder, and an intermediate plate embedded in the rubber elastic body. A plurality of cutout parts positioned on both end sides in the axial direction of the outer cylinder for joining an inner side rubber elastic body and an outer side rubber elastic body are formed in the intermediate plate. At least one of the cutout parts is arranged to overlap on an area that is sandwiched between two parallel imaginary planes that are adjacent to the outer peripheral surface of the inner cylinder.