Steerable EMU Bogie Layout for Reduced Articulated Train Turning Radius
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Solution Overview
Problem
Articulated trains have a large turning radius due to their length, limiting their flexibility and usability on urban roads, making them inflexible for navigation in tight spaces.
Innovation Solution
An EMU bogie with a framework, two EMU wheelsets, and an EMU steering driving device that allows simultaneous steering of both wheelsets, enhancing the steering flexibility of the connected EMU body by transmitting steering power through a single driving device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If articulated trains use traditional steering systems with multiple carriages, then the train can maintain structural stability, but the turning radius becomes very large leading to inflexible driving on urban roads
Solution Approach 1:
The train is divided into multiple independent wheelsets (first EMU wheelset and second EMU wheelset) that can be steered independently. Each wheelset is equipped with its own steering mechanism, allowing the train to navigate tight corners by adjusting the angle of individual wheelsets rather than requiring the entire long train body to turn as one unit.
Solution Approach 2:
The steering system transforms from a static, fixed-geometry configuration to a dynamic system where wheelset angles can be actively adjusted. The EMU steering driving device enables real-time modification of wheelset orientations, allowing the train to adapt its turning characteristics to match the specific requirements of urban road conditions.
2Ease of operation
If articulated trains have multiple carriages connected by hinges, then the train can achieve articulated movement, but the overall length increases making navigation in tight spaces difficult
Solution Approach 1:
The train configuration is segmented into multiple wheelsets with independent steering capabilities. This segmentation allows each wheelset to contribute to the turning motion, effectively reducing the overall turning radius and improving navigation capability in tight urban spaces without requiring a reduction in train length.
Solution Approach 2:
The system changes the operational parameters of the wheelsets by enabling independent angular adjustment of each wheelset. This parameter change allows the train to achieve complex turning motions that are not possible with fixed-geometry articulated designs, thereby improving ease of operation in constrained environments.
Data Source
AI summary
An EMU bogie and a rubber-tired train are disclosed. The EMU bogie comprises a framework, a first EMU wheelset, a second EMU wheelset and an EMU steering driving device, the framework comprises two side beams opposite to each other and cross beams connected to the two side beams; the first EMU wheelset comprises a first axletree, a first EMU wheel and a second EMU wheel which are arranged at two ends of the first axletree; the second EMU wheelset comprises a second axletree, and a third EMU wheel and a fourth EMU wheel which are arranged at two ends of the second axletree; and the EMU steering driving, device comprises a driving part and a transmission part connected to the driving part, the first EMU wheelset and the second EMU wheelset, and is used for transmitting the steering power to the first EMU wheelset and the second EMU wheelset.