Rail Vehicle Transition Bridge Bellows Support
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Solution Overview
Problem
The existing solutions for supporting bellows in articulated vehicle transitions, such as those used in rail vehicles, often lead to sagging due to transverse forces and require coordination between different manufacturers, as they typically rely on the coupling joint, which is not designed to handle lateral forces effectively.
Innovation Solution
The bellows is supported by a bridge traverse on the underside of a link bridge, which provides additional stiffness and allows the bellows to be mounted independently of the coupling, with fingers that can pivot and rest on the bridge crosshead, distributing the weight and absorbing transverse forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bellows is supported on the coupling joint, then the bellows can be mounted on the transition structure, but the coupling joint is subjected to significant transverse forces that it is not designed to absorb
Solution Approach 1:
The patent introduces a bridge traverse as an intermediary structural element between the bellows and the coupling joint. The bellows is supported on the bridge traverse rather than directly on the coupling joint, allowing the bridge traverse to absorb and distribute the transverse forces generated by the bellows weight, thereby protecting the coupling joint from excessive lateral loads
Solution Approach 2:
The support structure is extended into a third dimension by adding the bridge traverse that runs transversely across the gangway. This creates a distributed support system where the bellows weight is transferred to multiple points along the bridge traverse rather than concentrating forces at the coupling joint location
2Productivity
If the bellows is supported on the coupling, then the transition can be assembled, but the manufacturer of the coupling must be involved in design details and coordination is required between different manufacturers
Solution Approach 1:
The patent extracts the bellows support function from the coupling joint system and relocates it to the bridge traverse structure. This separation allows the bellows to be mounted independently on the bridge traverse without requiring the coupling joint manufacturer's involvement in design details, thereby reducing inter-manufacturer coordination complexity
Solution Approach 2:
The transition structure is segmented into functionally independent components: the coupling joint for longitudinal connection and the bridge traverse for bellows support. This segmentation allows each component to be designed and manufactured by different specialists without requiring extensive coordination, as the interface between them is simplified
3Adaptability or versatility
If a two-part bellows is used with coupling frames, then the bellows can be connected in the middle, but the bellows tends to sag due to its considerable weight
Solution Approach 1:
The bridge traverse is pre-installed and positioned to provide support before the bellows is fully assembled and connected. This preliminary support structure prevents sagging during assembly and operation, maintaining the bellows stability throughout the process
Data Source
Figure 1
Figure 2
AI summary
The transition bridge (10) has a bellows (20) provided with a finger (17) adjusted in height of the transition bridge. A truss bridge is provided on lower side of the transition bridge. The truss bridge runs over a part of the transition bridge at a distance from base of the transition bridge. The finger lies on the truss bridge for supporting the bellows.