Railway Axle Box End Stop Cap Variable Thickness Design
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Solution Overview
Problem
Existing end stop caps for rolling bearings in railway vehicles are prone to deformation under high bending stresses and fail to meet the requirement of weight reduction.
Innovation Solution
The end stop cap features a concave disc design with an annular lateral wall and an end wall of variable thickness, having maximum thickness in areas of high mechanical stress and a unique undulating profile to distribute stress uniformly, reducing weight while maintaining bending resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the end stop cap is made with uniform thickness to resist bending stresses, then the strength and deformation resistance are improved, but the weight increases
Solution Approach 1:
The end wall of the stop cap features variable thickness with localized thickening in specific areas. The thickness varies between a first value and a second value (greater than the first) at different radial positions, creating local reinforcement zones that resist bending stresses while keeping other areas thinner to reduce overall weight.
Solution Approach 2:
The end wall is designed with an undulating profile featuring convex and concave portions that create a non-uniform thickness distribution. This curved, wave-like geometry provides structural reinforcement against bending while maintaining material efficiency and reducing overall cap weight.
2Reliability
If the end stop cap thickness is increased to prevent deformation under screw pressure, then the reliability is improved, but the manufacturing complexity and material usage increase
Solution Approach 1:
Rather than uniformly increasing thickness throughout the cap, the invention applies localized thickening only in specific radial areas where bending stresses are highest. This targeted approach maintains reliability where needed while simplifying the overall structure and reducing unnecessary material usage in less critical areas.
Solution Approach 2:
The thickness parameter of the end wall is varied continuously or discontinuously across different radial positions. This parameter change creates an optimized thickness profile that provides adequate strength against screw pressure and bending while reducing overall complexity compared to a uniform thick-walled design.
Data Source
AI summary
An end stop cap for a rolling bearing for mounting in a railway axle box of a respective support device. The cap being a concave disc delimited by a lateral wall having a symmetric axis, coaxial with a bearing's symmetric axis by an end wall, transverse to the symmetric axis, and by an elbow-shaped transition connecting the end and lateral walls. Holes extend through the end wall for fastening screws. The lateral wall terminates on the side opposite the end wall in an annular frontal surface which rests against a bearing ring. The end wall has a continuously variable thickness, in at least one radial direction passing through an symmetric axis of the holes in a radial direction between a maximum thickness located in a position substantially intermediate between an inner edge of the hole and the symmetric axis and a minimum thickness at the position of the symmetric axis.