Helical Spring Mount Stress Distribution
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Solution Overview
Problem
The service life of helical springs in spring-loaded brakes is often limited by material failure at the end of the spring facing the braking element, which can lead to unreliable braking, especially in power failure scenarios.
Innovation Solution
The spring receptacle is designed with a guide area and a further area with a larger cross-section between the guide area and the braking element, allowing the helical spring to deform over a longer length and distribute material stress, reducing the risk of premature failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring receptacle has only a guide area extending along the helical spring, then the spring is properly guided along its extension direction, but the service life of the spring is limited due to material failure at the end facing the braking element
Solution Approach 1:
The spring receptacle is segmented into two distinct areas: a guide area that extends along the helical spring to provide proper guidance, and a further area with larger cross-section positioned between the guide area and braking element to reduce stress concentration. This segmentation allows each area to fulfill its specific function optimally.
Solution Approach 2:
The further area is designed with a larger cross-section specifically at the location where stress concentration occurs (near the braking element), while the guide area maintains its original dimensions for proper spring guidance. This local quality change reinforces the critical region without affecting the overall spring guidance functionality.
2Adaptability or versatility
If the braking element moves perpendicular to the spring extension direction due to play and friction forces, then the braking element can accommodate operational variations, but this causes increased deformation and material failure at the spring end
Solution Approach 1:
The further area with larger cross-section acts as a cushioning zone that absorbs and distributes the perpendicular forces before they reach the spring end. This preemptive stress distribution prevents material failure before it occurs, allowing the system to accommodate movement variations reliably.
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 design significantly increases the service life of the helical springs by reducing material stress and preventing local deformations that can cause premature wear and failure.
Implementation Method 1
the spring can move more in the direction perpendicular to its direction of extension than is the case with a conventional spring mount, the guide area of which extends over its entire length. In this area, the spring can deform over a larger part of its length as a result of the movements of the braking element
Data Source
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AI summary
The invention relates to a spring-applied brake having a helical spring for applying a force to a brake element in order to generate a braking action and having a spring support for receiving the helical spring. The spring support has a guide region which extends along the helical spring and a further region which extends along the helical spring, wherein the further region is arranged between the guide region and the brake element and has a greater cross section than the guide region.