Spring Hanger Welded to Beam Web for Fatigue Reduction
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Solution Overview
Problem
Trailer suspension systems face metal fatigue and failure due to high stress on the bottom flange of steel beams, particularly in dynamically loaded situations, as existing attachment methods like welding transfer stress to critical areas, leading to localized high stress and accelerated fatigue.
Innovation Solution
A spring hanger is designed to be welded directly to the lesser-stressed web of a support beam, rather than the bottom flange, alongside or in contact with existing transverse support members, to distribute suspension forces more evenly and reduce stress concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spring hanger is welded to the bottom flange of the beam, then the attachment method is simple and economical, but the stress concentration and metal fatigue increase
Solution Approach 1:
The patent introduces an intermediary component (the spring hanger with extended leg) that mediates between the suspension system and the beam. By extending the attachment point from the high-stress bottom flange to the lower-stress web area, this intermediary element redistributes the stress path and reduces concentration at the critical flange interface, thereby improving fatigue resistance while maintaining welding simplicity
2Device complexity
If the spring hanger is attached to the bottom flange, then the attachment position is fixed, but the stress on the beam structure increases
Solution Approach 1:
The patent moves the attachment point from a two-dimensional position on the bottom flange surface to a three-dimensional position on the web structure. The extended leg of the spring hanger allows attachment at a different spatial location (on the web rather than the flange), effectively using the third dimension to relocate the stress interface to a more favorable structural position with lower stress concentration
3Strength
If welding is used to attach the spring hanger, then the attachment is strong and durable, but the localized high stress and accelerated fatigue occur
Solution Approach 1:
The patent applies local quality by creating a differentiated stress distribution through the extended leg design. The welding connection is maintained for strength, but the extended geometry locally redirects the stress flow into the web structure where the material can better distribute the loads, thereby maintaining attachment strength while reducing localized stress concentration and improving overall fatigue life
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 approach reduces the risk of metal fatigue and failure by attaching the spring hanger to a lower-stress area, enhancing the durability of trailer suspension systems and allowing for retrofittable solutions that are cost-effective and suitable for various beam configurations.
Implementation Method 1
the spring hanger is welded directly to the web of a support beam
Data Source
AI summary
An improved suspension that may be used in any dynamically loaded beam structure, such as a trailer chassis. Specifically, an improved spring hanger and method for attachment are discussed, in which the improved spring hanger is welded to the web of a support beam, where stresses are lower, as opposed to the bottom flange thereof. Methods are provided for welding the spring hanger to said beam alongside as well as in contact with existing, transverse support members.