Vehicle Rail Interlock Structure for Lightweight Overload Protection
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Solution Overview
Problem
Conventional rail systems used in vehicle construction lack the ability to effectively absorb both static and dynamic loads, particularly in the event of accidents, and require a balance between being lightweight and withstanding significant forces.
Innovation Solution
A rail system design featuring a recess in the first rail element and a corresponding projection on the second rail element, which stabilizes the system by engaging with each other's lateral borders, allowing for elastic or plastic deformation to absorb loads while maintaining low material usage and temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional rail systems are designed to be lightweight, then weight is reduced, but load-bearing capacity and stability under high forces deteriorate
Solution Approach 1:
The rail system is divided into multiple rail elements with individual brackets at each end. Each bracket can independently engage with corresponding projections on adjacent rail elements, creating segmented load paths that distribute forces throughout the system rather than concentrating them on single structural components, enabling lightweight design while maintaining strength.
Solution Approach 2:
The brackets are designed with recesses that locally concentrate structural reinforcement exactly where loads are applied during engagement with projections. This localized quality enhancement provides high load-bearing capacity at critical points while keeping the overall rail system lightweight by avoiding unnecessary material throughout the entire structure.
2Strength
If rail elements are designed to withstand high forces in longitudinal and perpendicular directions, then strength is improved, but weight increases
Solution Approach 1:
The rail system employs dynamic engagement between brackets and projections that activates only when needed. During normal operation, the lightweight rail elements move freely with minimal structural mass. When high forces occur (such as during accidents), the brackets engage with projections to provide temporary structural reinforcement, achieving high strength-to-weight ratio by providing strength on-demand rather than continuously.
Solution Approach 2:
The combination of lightweight rail element materials with the engagement mechanism of brackets and projections creates a composite structural system. The rail elements themselves remain lightweight, but the engagement features provide enhanced strength characteristics when activated, effectively creating a composite structure that combines low weight with high load-bearing capacity under extreme conditions.
3Reliability
If overload protection mechanisms are added to the rail system, then reliability is improved, but device complexity increases
Solution Approach 1:
The brackets with recesses and corresponding projections on rail elements provide self-service overload protection. When excessive loads are applied, the projection automatically engages with the recess to stabilize the rail elements, preventing catastrophic failure. This self-activating mechanism eliminates the need for external sensors, control systems, or additional active components, maintaining simplicity while enhancing reliability.
Solution Approach 2:
The recesses in the brackets are pre-designed to accommodate projections during overload conditions. This beforehand preparation creates a built-in cushioning effect where the geometric features are already positioned and sized to absorb and distribute impact forces before they can cause damage. The structural design itself provides the protection rather than requiring additional protective devices.
4Stability of the object's composition
If brackets with recesses and projections are used for stabilization, then stability is improved, but manufacturing complexity increases
Solution Approach 1:
The bracket and projection features are merged into integrated structural elements rather than being separate components. The recesses are formed as part of the bracket geometry, and the projections are formed as part of the rail element geometry. This merging reduces the number of discrete parts and assembly steps while providing the necessary stabilization function, thereby improving ease of manufacture despite the enhanced stability function.
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 provides enhanced stability and overload protection with minimal weight increase, ensuring robustness and long service life without impairing the rail system's functionality across a wide temperature range.
Implementation Method 1
The stabilization takes place with static and dynamic loads, with an elastic and, if necessary, also with a plastic deformation of the rail elements
Implementation Method 2
The stabilization takes place with static and dynamic loads, with an elastic and, if necessary, also with a plastic deformation of the rail elements
Data Source
Figure 1a~2c
Figure 3a~3b
AI summary
The system (1) has two rail elements (11, 12) that are mutually movable along a longitudinal direction, where one of the rail elements is made of aluminum and comprises a running flap (14) at an end of the rail element perpendicular to the longitudinal direction. The flap of the rail element has a recess, and an end of the other rail element comprises a projection (15) corresponding to the recess such that the projection is formed at an end position within the recess. The former rail element comprises a C-shaped profile with two idle legs for connecting a center piece.