Solid Rail Wheel Cavity Design for Low Sound Emission
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Solution Overview
Problem
Solid wheels for rail vehicles face challenges in reducing sound emissions and maintaining low weight, as existing sound absorbers increase mass and multipart rubber-sprung wheels are costly.
Innovation Solution
A solid wheel design featuring a wheel rim connected to a hub via an end wall and rear wall, with arched transitions and openings that form a cavity, reducing weight and stress concentration while maintaining high axial and radial stiffness, and produced as a cast part using materials like austempered ductile iron for improved tribological properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound absorbers are added to reduce sound emissions, then sound absorption improves, but wheel mass increases
Solution Approach 1:
The wheel is divided into multiple segments including a hub, wheel rim, and multiple webs connecting them. The cavities are formed by removing material between the webs, creating a segmented structure that reduces mass while maintaining sound absorption capabilities through the cavity design.
Solution Approach 2:
The wheel incorporates cavities with openings that create a porous-like structure. These cavities absorb sound waves while the strategic placement of openings allows for mass reduction. The cavity structure provides sound absorption functionality without requiring traditional heavy sound-absorbing materials.
2Ease of manufacture
If the wheel structure is simplified to reduce weight, then manufacturing ease improves, but production time increases
Solution Approach 1:
The hub, wheel rim, and multiple cavities are merged into a single integrated component produced by one casting process. The casting mold is designed to create all features including the cavities and webs in one operation, eliminating the need for separate manufacturing steps and assembly operations.
Solution Approach 2:
The casting parameters are optimized to produce the complex cavity structures and thin web sections in a single process. The molten metal is poured at controlled rates and temperatures to ensure proper filling of the cavity spaces and formation of the thin-walled structures without requiring multiple processing steps.
Data Source
AI summary
A solid wheel for a rail vehicle includes a wheel rim arranged on the circumference of the solid wheel, a tread and a hub for a wheelset shaft, wherein the wheel rim is connected to the hub via an end wall and a rear wall, where the hub is arranged at the center of the solid wheel and includes a longitudinal axis such that a high radial and axial strength of the wheel flange as the basis for a low sound emission is provided by virtue of the solid wheel forming a cavity that is delimited by the end wall and the rear wall, where the end wall and the rear wall transition into each other below the wheel flange in an arched manner, and the end wall has first openings and the rear wall has second openings in order to open the cavity outwards in a spoked manner.