Rail Vehicle Front Structure Assembly with Interlocking Projections
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Solution Overview
Problem
The challenge in manufacturing rail vehicle front structures lies in minimizing manufacturing tolerances and reducing the effort required for assembly, as well as avoiding the mixing of similar parts, which often leads to incorrect connections and increased production time due to the need for subsequent straightening and welding.
Innovation Solution
The implementation of projections and recesses in the transition areas of front structure components, allowing for temporary and precise connections that can be easily corrected before permanent welding or soldering, along with the use of laser cutting for precise three-dimensional end surfaces and the integration of elongate elements with curved sections to reduce the number of individual parts and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional manual cutting and welding methods are used for front structure components, then flexibility in manufacturing is maintained, but manufacturing precision deteriorates and subsequent straightening effort increases
Solution Approach 1:
The patent applies preliminary action by pre-forming projections and recesses on components during the initial manufacturing stage. These features are created in advance with precise dimensions and positions, enabling accurate assembly without requiring extensive post-assembly straightening or adjustment work.
Solution Approach 2:
The patent introduces projections and recesses as intermediary features that mediate between individual components during assembly. These features act as guides and positioning elements that facilitate precise alignment and connection of front structure components, reducing the need for manual adjustment and straightening operations.
2Reliability
If multiple individual parts are connected to form the front structure, then structural flexibility is improved, but the risk of mixing similar parts increases leading to assembly errors
Solution Approach 1:
The patent applies asymmetry by designing projections and recesses with unique, non-symmetric geometries for different component positions. This ensures that each component has a specific orientation and position during assembly, preventing the mixing of similar parts and ensuring correct assembly configuration.
Solution Approach 2:
The patent uses preliminary action by pre-configuring unique projection and recess geometries on each component during manufacturing. This preliminary differentiation of similar-looking parts ensures that during assembly, components can only be correctly positioned in their intended locations, eliminating assembly errors from part mixing.
3Ease of manufacture
If permanent welding connections are made immediately, then structural strength is achieved, but the ability to correct positioning errors is lost
Solution Approach 1:
The patent applies preliminary action by first establishing temporary connections using projections and recesses to position components correctly, and only after verification does it proceed to permanent welding. This sequential approach allows correction of positioning errors before final welding, maintaining both correctability and final structural strength.
Solution Approach 2:
The patent introduces dynamics by creating a two-stage connection process: first a reversible temporary connection phase that allows for adjustment and correction, then an irreversible permanent welding phase. This dynamic approach to connection enables error correction while ultimately achieving strong permanent bonds.
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
This approach significantly reduces manufacturing effort, minimizes errors, and simplifies the assembly process by ensuring correct part alignment and positioning, thereby reducing the need for extensive straightening and welding, while maintaining the structural integrity and safety requirements of the front structure.
Implementation Method 1
at least one end of the elongate element is shaped in a predetermined manner, in particular by laser cutting
Implementation Method 2
at least one projection on a first part corresponds to a recess on a second part, and when they are connected, the parts are initially arranged relative to one another in such a way that the at least one projection extends into the corresponding recess engages
Implementation Method 3
The connection can now be made permanent, in particular by welding or soldering the two parts together
Data Source
AI summary
The structure (1) has a set of elongated elements (3, 5, 7, 9, 11) i.e. tube pieces, provided as supporting elements, where one of the elongated elements is connected to an end of the other elongated element. A projection (15) and a recess are formed in connection regions (19a-19c) of the elongated elements or at the end of the latter elongated element such that the projection is engaged with the recess. The elongated elements are arranged parallel to each other in a roof area of the structure, and extend in longitudinal direction of a rail vehicle. An independent claim is also included for a method for manufacturing a front structure of a rail vehicle.