Railway Wheel Web Inclination to Limit Rim Shift Under Braking Heat
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Solution Overview
Problem
Conventional railway vehicle wheels experience heat deformation and thermal stress during braking, leading to rim displacement and potential derailing, as well as fatigue fractures, making it difficult to simultaneously reduce both rim displacement and thermal stress in the web.
Innovation Solution
A railway vehicle wheel design featuring a web with a linear plate-thickness center line that inclines towards the flange, resisting rim displacement and minimizing stress concentration, combined with a decreasing plate thickness and specific angle and position configurations to reduce thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional bent web designs are used, then manufacturing flexibility is improved, but rim displacement and thermal stress cannot be simultaneously reduced
Solution Approach 1:
The invention changes the geometric parameters of the web by defining a specific plate-thickness center line configuration with linear sections at different angles. The first linear section has a first angle with the radial direction, and the second linear section has a second angle, creating optimized stress distribution paths that simultaneously reduce rim displacement and thermal stress during braking operations.
Solution Approach 2:
The web design employs asymmetric geometry where the plate-thickness center line consists of linear sections with different angles relative to the radial direction. This asymmetric configuration optimizes the stress distribution pattern to simultaneously address both rim displacement and thermal stress reduction, rather than using symmetric bent designs.
2Stress or pressure
If the web plate thickness is decreased, then thermal stress is reduced, but structural strength may be compromised
Solution Approach 1:
The web is designed with varying plate thickness distributed along its length, with each section optimized for its specific functional requirements. The plate-thickness center line configuration creates local thickness variations that reduce thermal stress in high-heat areas while maintaining adequate structural strength in load-bearing regions.
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 design effectively reduces rim displacement and thermal stress in the web during braking, enhancing the stability and longevity of the wheel by inhibiting rim swinging and stress concentration.
Implementation Method 1
a temperature of the wheel, particularly a temperature of a rim that forms an outer circumferential portion of the wheel rises, causing heat deformation of the rim
Implementation Method 2
the heat deformation of the rim and the occurrence of the thermal stress in the web during braking of the railway vehicle may cause a fatigue fracture of the wheel
Data Source
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AI summary
A wheel (100) includes a boss (10), a rim (20), and a web (30). The rim (20) includes a tread (21) and a flange (22). The web (30) connects the boss (10) and the rim (20). When the wheel (100) is viewed in its longitudinal section, the web (30) has a linear plate-thickness center line (A) that is inclined such that the plate-thickness center line (A) approaches the flange (22) side as it extends outward in a radial direction. When the wheel (100) is viewed in its longitudinal section, an outer end (Aa) of the plate-thickness center line (A) is positioned between the flange (22) and a center (211) of the tread (21) in an axial direction of the wheel (100).