Segmented Railway Wheelset Axle Guard with Transversal Grooves
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Solution Overview
Problem
Existing protecting elements for railway wheelset axles are either costly, difficult to install, or provide inadequate protection against impacts and corrosion, with limitations in material strength, ease of installation, and maintenance accessibility.
Innovation Solution
A protecting element made of high-density polyethylene with transversal grooves, allowing manual rolling and securing on the axle without complex machinery, providing high strength and flexibility to withstand impacts while allowing for easy inspection and reduced paint thickness, and manufactured without molds for cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid protecting element made of PEX is used to provide seamless protection, then protection effectiveness is improved, but manufacturing cost and device complexity increase due to requiring multiple molds and pipe clamps
Solution Approach 1:
The protecting element is divided into multiple modular segments that can be independently manufactured and then assembled around the axle. Each segment is made from a single mold, avoiding the need for complex multi-mold assemblies. The segments connect through simple interference fits or mechanical joints, eliminating the need for pipe clamps and reducing assembly complexity while maintaining continuous protection.
Solution Approach 2:
Instead of creating a seamless protecting element through complex molding processes, the invention inverts the approach by using discrete modular segments that naturally assemble into a continuous protective structure. This inversion simplifies both manufacturing and assembly while achieving the same protection effectiveness.
2Reliability
If protective paint is applied in high thickness layers to protect the axle surface, then corrosion protection is improved, but magnetic inspection capability deteriorates and paint repair becomes necessary
Solution Approach 1:
The protecting element serves as an intermediary between the axle and the corrosive environment. It provides the primary corrosion protection function, allowing the protective paint on the axle to be applied in much thinner layers that do not interfere with magnetic inspection methods. The protecting element absorbs the impact and corrosion protection functions, enabling the paint to serve only as a surface protective layer.
3Ease of manufacture
If a non-rigid elastomeric protecting element is used to reduce cost, then manufacturing cost is improved, but impact protection capability deteriorates
Solution Approach 1:
The protecting element uses composite construction combining rigid or semi-rigid impact-resistant materials with cost-effective manufacturing methods. The modular segment design allows use of high-strength materials in critical impact zones while using simpler materials in less critical areas, optimizing both protection capability and manufacturing cost.
4Strength
If a thick protecting element is used to ensure adequate protection, then impact resistance is improved, but ease of installation deteriorates due to inability to manually roll it up
Solution Approach 1:
The protecting element is segmented into multiple thinner modular sections that can be individually rolled up and manually installed around the axle. Each segment maintains adequate thickness for impact resistance while the modular nature allows easy handling and installation without requiring heavy machinery. The segments assemble into a complete protective covering through simple connection mechanisms.
Data Source
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AI summary
A protecting element of railway wheelsets is described, the protecting element being constituted by a pad provided with a plurality of transversal grooves without which the pad could not be rolled up on the axle at room temperature. The pad is made of a material having high thickness or high strength, that is respectively between 5 mm and 10 mm and between 50 kJ/m2 and 80 kJ/m2. Thanks to the combination of thickness and resilience values, in addition to the grooves, the pad can be manually rolled up on the axle, without the aid of presses and without prior heating. Thus, the solution according to the present invention combines the advantages of ease of installation, such as the possibility of manually rolling up the protecting element on the axle, with the effectiveness of the protection provided by rigid protecting elements.