Rail Vehicle Crash Buffer Guide Rod Lateral Force Absorption
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Solution Overview
Problem
Existing crash buffers for rail vehicles are ineffective in absorbing lateral forces during collisions, leading to potential buckling and loss of effectiveness, and can cause significant damage to the supporting structure.
Innovation Solution
A crash buffer design featuring a guide rod with a smaller cross-section attached to the ram, which is mounted via a floating bearing on the supporting structure, allowing for improved guidance and absorption of transverse forces, and featuring a push-through opening with potential deformation mechanisms to dissipate energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional crash buffer without a guide rod is used, then the structure is simpler, but lateral forces during collision cause the plunger to become wedged and the buffer to buckle, losing effectiveness
Solution Approach 1:
The guide rod acts as an intermediary element between the plunger and the supporting structure. It provides a dedicated guidance path through the floating bearing connection, mediating the lateral forces and preventing the plunger from becoming wedged in the sleeve during collision, thus maintaining buffer effectiveness without requiring complete redesign of the buffer system
Solution Approach 2:
The guidance function is segmented from the main buffer structure. Instead of relying on the sleeve-plunger interface alone for both force transmission and guidance, the guide rod provides a separate, dedicated guidance path. This segmentation allows the sleeve to focus on force transmission while the guide rod handles lateral force management and plunger alignment
2Object-affected harmful factors
If the guide rod is rigidly fixed to the supporting structure, then lateral guidance is more stable, but the buffer cannot effectively absorb lateral forces and the supporting structure suffers more damage
Solution Approach 1:
The floating bearing connection creates a dynamic system that adapts to collision conditions. The bearing allows controlled movement and rotation of the guide rod, enabling the system to dynamically absorb lateral forces through controlled deformation and energy dissipation while maintaining sufficient guidance stability to prevent plunger wedging
Solution Approach 2:
The floating bearing connection changes the mechanical parameters of the guide rod assembly. It introduces controlled degrees of freedom that allow the guide rod to rotate and move slightly, transforming the rigid guidance system into one that can accommodate lateral forces through parameter changes in position and orientation while maintaining functional guidance
3Strength
If the guide rod has a larger cross-section for better guidance, then lateral support is improved, but the floating bearing connection and installation complexity increase
Solution Approach 1:
The guide rod uses a locally optimized cross-section that provides sufficient lateral support capability at the critical guidance points while maintaining a smaller overall size. The floating bearing connection is implemented only where needed to provide the necessary degrees of freedom, concentrating the complexity management at specific locations rather than throughout the entire structure
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 design effectively absorbs lateral forces, reduces the risk of the plunger becoming wedged, and prevents unintended deformation, thereby reducing damage to the supporting structure and maintaining the buffer's effectiveness.
Implementation Method 1
The guide rod (7) is laterally supported in a floating bearing, namely in the through-opening (4).... In the event of a collision, the guide rod (7) and thus the plunger (6) move towards the supporting structure (3), wherein the floating bearing enables movement of the guide rod (7)
Implementation Method 2
The plunger (6) is supported by a force transmission element in the form of a spring (8) against the mounting flange (2a)
Data Source
Figure 1~3
Figure 4~6
Figure 7~9
AI summary
A crash buffer (1) for supporting structures (3) of rail vehicles with controlled compression is proposed, comprising a first and second guide element, each in the form of a sleeve (2) and a plunger (6), wherein the sleeve has a mounting flange (2a) with which the sleeve can be fixedly attached to the supporting structure, and the plunger is displaceable relative to the sleeve in the longitudinal direction of the vehicle and is guided by the sleeve during its displacement movement, and with a force transmission element (8) for flexibly coupling the plunger to the supporting structure. A third guide element in the form of a guide rod (7, 7a) is attached to/mounted on the plunger, which has a smaller cross-section than the first and second guide elements (2), wherein the mounting flange has a through-hole (4) in which the guide rod is mounted.