Anti-vibration Device with Localized Protrusions
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Solution Overview
Problem
Conventional anti-vibration devices face durability issues due to large protruding deformation in the lateral direction when required to exhibit different spring characteristics in directions perpendicular to the axial direction, leading to increased tensile stress and potential cracking.
Innovation Solution
The anti-vibration device features a tubular rubber body with protrusions on the inner circumferential surface that abut against an inner tube, surrounded by an outer tube, allowing for varying spring characteristics without compromising durability by restricting lateral deformation and distributing tensile stress uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the inner circumferential surface of the rubber body protrudes along its entire length to abut the inner tube, then high spring characteristics in a certain perpendicular direction are achieved, but the cavity accepting inward deformation is reduced, causing large lateral protruding deformation and increased tensile stress that deteriorates durability
Solution Approach 1:
The invention applies local quality by providing protrusions only at specific axial regions (first and second regions) rather than along the entire length of the rubber body. This localized approach allows the rubber body to maintain high spring characteristics in directions where protrusions are present while preserving sufficient cavity volume in other regions to accommodate deformation and prevent excessive lateral protruding, thus resolving the contradiction between adaptability and reliability
Solution Approach 2:
The invention segments the protrusion structure into multiple discrete protrusions positioned at different axial regions and circumferential positions. This segmentation allows different parts of the rubber body to have different functional characteristics - some regions provide spring support while others maintain deformation capacity - enabling the system to achieve both high spring characteristics and durability simultaneously
2Adaptability or versatility
If the rubber body is designed to exhibit different spring characteristics in different perpendicular directions, then vehicle-specific requirements are met, but the rubber body experiences large protruding deformation in the lateral direction leading to increased tensile stress and potential cracking
Solution Approach 1:
The invention implements local quality by strategically positioning protrusions at specific circumferential locations and axial regions to create anisotropic spring characteristics. The rubber body provides different spring constants in different perpendicular directions where protrusions are located, while maintaining uniform strength and resistance to cracking in regions where the cavity provides deformation accommodation space
Solution Approach 2:
The invention applies asymmetry by arranging protrusions non-uniformly around the circumferential direction and at different axial positions. This asymmetric configuration enables the rubber body to exhibit different spring characteristics in different perpendicular directions while the overall symmetric cavity structure ensures uniform stress distribution and prevents localized stress concentration that could lead to cracking
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 enhances spring constants in desired directions while minimizing protruding deformation, thereby improving durability and maintaining consistent tensile stress distribution across the rubber body.
Implementation Method 1
When the device 100 is used and the rubber body 101 is compressed and deformed in the axial direction
Implementation Method 2
a protrusion protruding from the inner circumferential surface of the tubular rubber body to abut against or be located close to the inner tube
Data Source
Figure 1(a)~1(c)
Figure 2
Figure 3~4
AI summary
An anti-vibration device (1) has a tubular rubber body (2); a support plate (3) attached to an end face at one end of the tubular rubber body (2); and an inner tube (4) fixedly arranged in the rubber body at the one end (2e) so as to form a cavity (6) between the inner circumferential surface of the rubber body (2) and the outer circumferential surface of the inner tube (4). A protrusion (7a, 7b) protruding from the inner circumferential surface to abut against or be located close to the inner tube (4) is provided circumferentially partially on the inner circumferential surface at the other (2f) end of the rubber body (2). An outer tube (5) is arranged so as to surround a portion (2a) of the rubber body (2) at the other end (2f). The protrusion (7a, 7b) extends over an axial region of the rubber body (2) where the outer tube (5) is arranged.