Modular Hollow Wheelset Shaft With Pressure-Based Damage Detection
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Solution Overview
Problem
Existing wheelset shafts for rail vehicles face challenges in achieving high component and operational safety, low mass, long service life, and low costs, particularly due to high material losses during hollow bore creation and inadequate damage detection.
Innovation Solution
A modular wheelset design with segments of varying materials, geometries, and dimensions, incorporating valves, pressure sensors, and data transmission capabilities to detect damage and enhance maintenance, along with friction welding and flash butt welding for secure connections and reduced heat-affected zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a hollow bore is created in the wheelset axle, then mass is reduced, but material losses increase during manufacturing
Solution Approach 1:
The wheelset axle is divided into multiple segments (first segment, second segment, third segment) that are connected together. The second segment is designed as a hollow shaft while the first and third segments can be solid, allowing mass reduction in critical areas without requiring hollowing of the entire axle structure, thus reducing overall material waste.
Solution Approach 2:
Different segments of the axle are designed with different material properties and geometries. The second segment is made hollow to reduce mass where it is not critical for structural integrity, while the first and third segments (which need to support wheels and bearings) can be solid for strength. This localized approach reduces material usage without compromising overall axle performance.
2Reliability
If pressure sensors and valves are added to detect damage, then operational safety is improved, but device complexity increases
Solution Approach 1:
The hollow second segment serves multiple functions: it reduces mass, provides a cavity for pressure sensors and valves, and allows for damage detection through pressure changes. The same structural feature (hollow design) that reduces mass also enables the integration of sensing capabilities, eliminating the need for separate complex sensing structures.
Solution Approach 2:
The system uses the natural pressure changes within the hollow axle structure to detect damage. Pressure sensors monitor the internal pressure of the hollow second segment, and any unexpected pressure changes indicate potential cracks or damage. This self-monitoring approach uses the axle's own structure for detection rather than requiring external complex monitoring systems.
3Strength
If friction welding is used to connect segments, then connection strength is improved, but heat-affected zones increase
Solution Approach 1:
The axle is segmented into multiple parts that are joined through friction welding. By dividing the axle into manageable segments (first segment, second hollow segment, third segment), the welding process can be controlled in discrete locations, allowing for better heat management and reduced overall heat-affected zones compared to forging a single large piece.
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 solution increases operational safety, reduces material usage, and enables early detection of damage, leading to improved maintenance efficiency and cost-effectiveness while maintaining strength and reducing mass compared to solid shafts.
Implementation Method 1
at least one pressure sensor is arranged in the hollow shaft for detection of a pressure change
Implementation Method 2
at least one valve is arranged in the hollow shaft for influencing a pressure in the hollow shaft
Implementation Method 3
Individual segments of the wheelset axle are firmly connected using a friction welding technique
Data Source
Figure 1~2
AI summary
The invention relates to a wheelset for vehicles, more particularly for chassis of rail vehicles, which wheelset comprises a first wheel (1), a second wheel (2) and a wheelset shaft (3), wherein the wheelset shaft (3) comprises at least one first segment (4), a second segment (5) and a third segment (6), and wherein at least the second segment (5) is integrally joined to the at least first segment (4) and to the third segment (6). To create advantageous construction conditions, the invention proposes that at least one segment of the at least one first segment (4), the second segment (5) and the third segment (6), is designed as a hollow shaft and can be filled with fluid, wherein at least one first opening (11) is provided with at least one valve and at least one pressure sensor. This results in a modular, load-appropriate design of the wheelset shaft (3).