Shock-absorbing stopper with segmented elastic body
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Solution Overview
Problem
Conventional shock-absorbing stoppers with annular hollows in the outer peripheral surface experience significant sliding wear when the movable-side end portion contacts the housing, leading to reduced performance, especially when the axial displacement is excessive.
Innovation Solution
A shock-absorbing stopper with a cylindrical elastic body sectioned into three portions, where the movable-side large diameter portion has a smaller outer diameter and axial width compared to the fixed-side large diameter portion, creating a larger radial gap and reducing contact pressure with the housing, thereby minimizing sliding wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the hollow is provided in the outer peripheral surface of the elastic body to reduce contact surface pressure, then the sliding wear is reduced, but the axial width of the elastic body becomes excessively large
Solution Approach 1:
The elastic body is segmented into three distinct portions along its axial direction: a small diameter portion formed by the hollow, a fixed-side large diameter portion, and a movable-side large diameter portion. This segmentation allows each portion to have optimized dimensions independent of the others, enabling the movable-side large diameter portion to have reduced axial width while maintaining the hollow's wear-reducing function.
Solution Approach 2:
Different portions of the elastic body are given different local qualities through varying outer diameter and axial width dimensions. The movable-side large diameter portion has specifically reduced dimensions compared to the fixed-side portion, creating local optimization at the movable side where the hollow exists, while maintaining adequate dimensions at the fixed side for structural stability.
2Object-affected harmful factors
If the movable-side large diameter portion has reduced outer diameter and axial width to maintain radial gap, then sliding wear is minimized, but the shock absorbing capacity may be reduced
Solution Approach 1:
The elastic body is divided into three portions along the axial direction, allowing the shock-absorbing function to be distributed across multiple segments rather than concentrated in one portion. The small diameter portion with the hollow, the fixed-side large diameter portion, and the movable-side large diameter portion each contribute to the overall shock absorption while maintaining appropriate radial gaps to prevent sliding wear.
Solution Approach 2:
The solution transitions from a uniform cylindrical structure to a multi-dimensional structure with varying outer diameters and axial widths across different portions. By utilizing the axial dimension to create diameter variations and the radial dimension to maintain gaps, the invention achieves both wear reduction and shock absorption without requiring excessive material in any single location.
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 configuration effectively prevents sliding wear by maintaining a larger radial gap and reducing contact surface pressure, ensuring the movable-side large diameter portion does not contact the housing or reduces contact width, thus enhancing the stopper's performance and longevity.
Implementation Method 1
the elastic body 52 is compressed. Therefore, the shock absorbing function by the compression and deformation of the elastic body 52 is exhibited
Implementation Method 2
the outer peripheral surface 52a of the compressed elastic body 52 is radially outward swollen and deformed
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The invention provides a shock-absorbing stopper capable of preventing an elastic body from contacting a mating component, such as a housing, to cause sliding wear as much as possible in a structure where a hollow is provided in the outer peripheral surface of the elastic body. In order to achieve the object, a shock-absorbing stopper has a cylindrical elastic body, to one end portion of which a fixed-side metal fitting is connected and to the other end portion of which a movable-side metal fitting is connected and which has an annular hollow in the outer peripheral surface of the cylindrical elastic body, in which the shock-absorbing stopper is sectioned into three portions by the hollow of a small diameter portion formed by the hollow, a fixed-side large diameter portion located closer to the fixed side relative to the hollow, and a movable-side large diameter portion located closer to the movable side relative to the hollow. The outer diameter dimension of the movable-side large diameter portion is set smaller than the outer diameter dimension of the fixed-side large diameter portion and the axial width of the movable-side large diameter portion is set smaller than the axial width of the fixed-side large diameter portion.