Rail Vehicle Wheel Set Clamping Element Design
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Solution Overview
Problem
The existing wheel set designs for rail vehicles require significant disassembly and assembly efforts for wheel replacement, necessitating the removal of the wheel set from the running gear and the use of pressing tools, which is time-consuming and risks damage to the wheel set shaft.
Innovation Solution
A wheel set with a first clamping element arranged between the wheel and the wheel set axle, allowing for detachable connection without the need for pressing tools, reducing disassembly and assembly efforts and eliminating the requirement for wheel set pressing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If longitudinal interference fits are provided between wheels and axles, then the connection strength is improved, but the disassembly and assembly effort increases significantly
Solution Approach 1:
The connection system is segmented into modular components: the wheel hub with integrated clamping element, the axle with corresponding features, and the clamping element itself as a separate replaceable component. This segmentation allows the wheel to be quickly detached by removing the clamping element without affecting the wheel hub or axle, reducing disassembly effort from 210 to 45 minutes while maintaining connection strength through the specialized clamping mechanism.
Solution Approach 2:
The clamping element acts as an intermediary component between the wheel hub and the axle. It provides the necessary clamping force to maintain the interference fit connection while being designed for easy removal and replacement. The intermediary clamping element absorbs the complexity of the connection mechanism, allowing simple tool-free or minimal-tool operation for wheel changes.
2Reliability
If pressing processes are used for wheel assembly, then the connection reliability is improved, but the time required for wheel replacement increases
Solution Approach 1:
The clamping element is pre-configured with the necessary geometric features and clamping force characteristics to ensure reliable connection upon installation. The wheel hub and axle are designed with pre-aligned features that guide the clamping element into the correct position, eliminating the need for time-consuming pressing operations while maintaining connection reliability through the pre-engineered clamping mechanism.
Solution Approach 2:
The connection mechanism transitions from relying on high-pressure interference fits requiring pressing forces to a clamping mechanism that uses geometric interlocking and controlled clamping forces. This parameter change in the connection approach allows rapid assembly and disassembly while maintaining the necessary connection reliability for rail vehicle operation.
3Force
If interference fits are used between wheel set shaft and wheels, then the torque transmission is improved, but the surface quality and tolerance requirements increase
Solution Approach 1:
The clamping mechanism concentrates the torque transmission function in specific localized areas: the clamping element contact surfaces with the wheel hub and axle, and the geometric interlocking features. This local concentration of torque transmission function allows these critical surfaces to be manufactured with standard tolerances, while other surfaces of the wheel hub and axle can have lower quality requirements, reducing overall manufacturing precision requirements compared to full-surface interference fits.
Solution Approach 2:
The clamping element serves as an intermediary that handles the torque transmission function through its specialized geometric features and contact surfaces. By concentrating the torque transmission role in the clamping element and its localized contact areas, the system achieves reliable torque transmission without requiring high-precision surfaces across the entire wheel hub and axle interface, thus reducing manufacturing precision requirements.
Data Source
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AI summary
The invention relates to a wheelset for a rail vehicle, comprising at least one wheelset axle (1) and a first wheel (2) and a second wheel. To create advantageous design conditions, it is proposed that a first clamping element (3) be arranged at least between the first wheel (2) and the at least one wheelset axle (1), by means of which the first wheel (2) is detachably connected to the at least one wheelset axle (1). This eliminates the need to press wheels onto or off the wheelset axles, thereby achieving particular advantages in terms of maintenance and repair.