Vibration Damping Device Stopper Segmentation
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Solution Overview
Problem
Existing vibration damping devices face issues with the spring constant increasing immediately after the stopper portion comes into contact with the stopper wall due to vibrations, leading to excessive relative displacement between brackets.
Innovation Solution
The vibration damping device incorporates a stopper portion with a first elastic portion and a second stopper portion, where the first stopper portion is positioned closer to the stopper wall than the second stopper portion, preventing the spring constant from increasing and restraining excessive relative displacement by using a combination of elastic and rigid members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single stopper portion is used, then the structure is simple, but the spring constant increases immediately after contact with the stopper wall causing excessive relative displacement
Solution Approach 1:
The stopper portion is divided into multiple stopper portions (first stopper portion and second stopper portion) arranged in the radial direction. This segmentation allows different portions to engage at different stages of displacement, preventing the spring constant from increasing abruptly and maintaining stable damping performance throughout the motion range.
Solution Approach 2:
Different stopper portions are positioned at different radial distances from the center, creating localized stopping characteristics. The first stopper portion engages at a smaller radial distance while the second engages at a larger radial distance, providing progressively different levels of restraint to control the spring constant behavior at various displacement stages.
2Length of moving object
If the stopper portion is positioned closer to the stopper wall, then relative displacement is restrained, but the spring constant increases immediately causing excessive displacement
Solution Approach 1:
The stopper portion is segmented into multiple portions at different radial positions. This allows the system to progress through multiple contact stages rather than a single abrupt contact, distributing the force application and preventing sudden spring constant increases while effectively restraining relative displacement between brackets.
Solution Approach 2:
The stopper mechanism transitions from a static single-point contact to a dynamic multi-stage contact system. As the brackets move relative to each other, different stopper portions engage sequentially, creating a progressive force response that adapts to the displacement magnitude and prevents abrupt spring constant changes.
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
This configuration effectively prevents the spring constant from increasing and restricts excessive relative displacement between brackets when vibrations are input, ensuring stable damping performance.
Implementation Method 1
The first stopper portion is constituted by a first elastic portion
Implementation Method 2
The second stopper portion includes a rigid member
Data Source
Figure 1
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AI summary
According to the present invention, there is provided a vibration damping device (10) including a first bracket (11) and a second bracket (12), a first attachment member (14), a second attachment member (15), and an elastic body (16). The second attachment member (15) includes an insertion cylinder portion (22) in which the second bracket (12) is inserted. The insertion cylinder portion (22) is provided with a stopper portion (56) which faces a stopper wall (55) provided in the first bracket (11), in a radial direction (Y) in a side wall portion (57) oriented outward in the radial direction (Y) of the insertion cylinder portion (22). The stopper portion (56) includes a first stopper portion (61) and a second stopper portion (62) which are disposed in a manner of being displaced in an axial direction (X) of the insertion cylinder portion (22). The first stopper portion (61) is constituted by a first elastic portion (58). The second stopper portion (62) includes a rigid member (25). A first distance (D1) between the first stopper portion (61) and the stopper wall (55) in the radial direction (Y) is equal to or shorter than a second distance (D2) between the second stopper portion (62) and the stopper wall (55) in the radial direction (Y).