Semi-Trailer Kingpin Immobilization via Segmented Support Structure
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Solution Overview
Problem
Current coupling pin locking systems for semi-trailers are vulnerable to damage from shocks during transportation, particularly on railway units, leading to potential structural integrity issues that may not be easily detectable, posing risks during transit and unloading.
Innovation Solution
A support structure with a locking system that includes a vertically movable nacelle, a rigid connecting structure to absorb longitudinal forces, and an elastic return device to maintain the nacelle in an untitled position, along with an impact detection system using shear pins and pneumatic pipe bypass to alert operators of potential damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the nacelle is connected to a support assembly which is free in longitudinal deflection movements, then the nacelle can lower and rise smoothly, but the shock is transmitted to the locking system and to the coupling pin during collision
Solution Approach 1:
The support assembly is segmented into a rigid connecting structure that remains fixed during transport and an articulated connecting arm that allows vertical movement. This segmentation isolates the shock absorption function from the structural support function, preventing shock transmission to the locking system while maintaining smooth nacelle operation.
Solution Approach 2:
The rigid connecting structure acts as an intermediary between the railway vehicle frame and the nacelle assembly. It mediates the force transmission by providing a stable, shock-resistant connection that prevents longitudinal shocks from reaching the locking system during collisions.
2Strength
If the elevation means is mounted fixed on the rail unit, then it withstands vertical loads and shocks, but it undergoes large part of the longitudinal shock in the event of collision
Solution Approach 1:
The elevation means is transformed from a fixed mounting to a dynamic, articulated mounting that can move vertically relative to the rigid connecting structure. This dynamic configuration allows the elevation means to absorb vertical movements while the rigid structure absorbs longitudinal shocks, separating the two force vectors.
Solution Approach 2:
The connection geometry is changed from a fixed rigid connection to an articulated connection that permits movement in the vertical dimension while maintaining rigidity in the longitudinal dimension. This dimensional differentiation allows the system to handle vertical loads and longitudinal shocks through different structural paths.
3Ease of manufacture
If the locking system is designed to meet road standards, then it is simpler and easier to operate, but it does not meet railway standards and is likely to be damaged by shock
Solution Approach 1:
The rigid connecting structure provides beforehand cushioning for the locking system by absorbing and isolating longitudinal shocks before they can reach the coupling pin. This pre-protection allows the use of simpler locking systems designed for road standards while meeting railway shock resistance requirements through the protective 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
Enhances the structural integrity of the coupling pin locking system to meet railway standards, allowing for tolerance in operational stresses and providing a means to detect and respond to significant shocks, ensuring safety and preventing accidents.
Implementation Method 1
an elastic return device which brings the receiving nacelle back to the untilted position
Implementation Method 2
at least one shear pin provided in this articulation and which breaks when the rigid connecting structure undergoes a longitudinal force which exceeds a given threshold
Data Source
Figure 1~4
Figure 5~7
Figure 8~9
AI summary
A system for immobilising a semi-trailer kingpin on a transport vehicle comprising a balance arm (16) and a substantially horizontal rigid linking structure (33) designed to guide the vertical movement of the receiving platform (5), hold it in position above the lifting system (7) in a horizontal plane and take up the forces exerted thereon. The longitudinal rigid linking structure (33) is linked in a hinged manner to the receiving nacelle (5) and to the transport vehicle in order to take up the longitudinal forces from same, and the balance arm (16) comprises preloaded springs (21a) that take up the forces experienced by the balance arm (16) when the receiving nacelle (5) is temporarily inclined relative to the horizontal plane. The lifting system (7) for lifting the receiving nacelle (5) is mounted pivoting on the rail unit (4) at a pivot axis (15) transverse to the longitudinal axis of the transport vehicle.