Rectangular Frame Vibration Isolator with Compressive Elastic Body
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vibration damping devices are ineffective in attenuating and absorbing vibrations input in the axial direction, as the elastic body undergoes shear deformation rather than compressive deformation.
Innovation Solution
A vibration damping device featuring a frame-like external member and a tubular member with an elastic body of rectangular shape, where the tubular member's central axis aligns with the short-side direction of the frame, allowing the elastic body to compressively deform and absorb vibrations regardless of input direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elastic body is disposed between parallel tubular members with central axes shifted from each other, then radial and vertical vibrations are effectively attenuated through compressive deformation, but axial vibrations are not sufficiently attenuated because the elastic body undergoes shear deformation instead of compressive deformation
Solution Approach 1:
The patent introduces a frame-like member with a rectangular cross-section and positions the tubular member such that its central axis extends in the short-side direction of the frame. This dimensional reorientation allows the elastic body to experience compressive deformation from vibrations in multiple directions (radial, vertical, and axial), transforming the deformation mode from shear to compression across all vibration directions.
Solution Approach 2:
The frame-like member has an asymmetric rectangular cross-section where the lower end edge of the long-side portion is positioned on the inner side relative to the upper end edge in the short-side direction. This asymmetric positioning creates differential compression paths for the elastic body, enabling effective attenuation of vibrations from different directions through compressive deformation rather than shear deformation.
2Ease of manufacture
If the elastic body connects the outer circumferential surface of the inner attachment member to the inner circumferential surface of the outer attachment member, then the structure is simple and easy to manufacture, but the vibration attenuation performance in axial direction is insufficient
Solution Approach 1:
The elastic body is divided into multiple portions: a first portion that adheres to the inner circumferential surface of the long-side portion of the frame-like member, and a second portion that comes into contact with the external member in a non-adhering state. This segmentation allows each portion to perform different functions - the first portion provides structural connection while the second portion enables compressive deformation for axial vibration attenuation through friction-based contact.
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 device reliably attenuates and absorbs vibrations in any direction by ensuring compressive deformation of the elastic body, enhancing vibration damping performance.
Implementation Method 1
an elastic body which connects the external member and the tubular member... since the elastic body is subjected to compressive deformation rather than shear deformation, the vibration can be reliably attenuated and absorbed
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The present invention is a vibration damping device (1, 2) that includes an external member (11, 21) attached to one of a vibration-generating portion and a vibration-receiving portion; a tubular member (40) attached to the other of the vibration-generating portion and the vibration-receiving portion; and an elastic body (30) which connects the external member (11, 21) and the tubular member (40). The external member (11, 21) includes a frame-like member (11, 21) having a rectangular shape when viewed from the top. In the elastic body (30), a long-side portion (32a) forming a long side of a rectangular shape when viewed from the top adheres to an inner circumferential surface of the long-side portion (12a, 12b) of the frame-like member (11, 21), and a short-side portion (32b) forming a short side of the rectangular shape when viewed from the top comes into contact with the external member (11, 21) in a long-side direction (X) in which the long-side portion (12a, 12b) extends when viewed from the top, in a non-adhering state.