Spring Rod Clip Fastener Spatial Geometry for Rail Stability
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Solution Overview
Problem
Existing clip fasteners for rail fastening lack complex spatial geometry, leading to excessive stiffness, reduced stability of rail pressing force, and localized stress distribution, which results in reduced lifespan due to stress concentration and insufficient compliance.
Innovation Solution
A spring rod-shaped clip fastener with complex spatial geometry is designed, featuring a B-shaped structure in the horizontal plane with radially convex sections in both longitudinal and transverse profiles, providing increased compliance and uniform stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the clip structure is made with simple planar geometry, then the manufacturing is easier and the structure is simpler, but the stiffness becomes excessive and the compliance is insufficient to compensate for pad thickness reduction
Solution Approach 1:
The patent transitions from a planar two-dimensional clip structure to a three-dimensional spatial structure with arches and curved sections. The clip includes side lengthy sections formed by parts of circumferences and arched sections that protrude in the vertical dimension, creating complex spatial geometry that provides both reduced stiffness and maintained structural integrity.
Solution Approach 2:
The patent employs curved and arched geometries throughout the clip structure. The side lengthy sections are formed by parts of circumferences with specific centers, and the arched sections have defined radii of curvature. These curved elements provide elastic compliance and reduce stiffness while maintaining structural strength, allowing the clip to compensate for pad thickness reduction.
2Device complexity
If the clip structure is made with simple planar geometry, then the manufacturing is easier, but stress concentration occurs in individual sections leading to reduced service life
Solution Approach 1:
By introducing three-dimensional arches and curved sections, the load path is distributed across multiple spatial dimensions rather than concentrated in a single planar section. The arched sections and side lengthy sections create a distributed stress pattern that prevents localized stress concentration and extends service life.
Solution Approach 2:
The clip structure is divided into distinct functional sections: the rectilinear on-rail section, side lengthy sections formed by circumferential parts, arched sections with specific radii, and end sections. This segmentation allows each section to be optimized for its specific function and distributes stresses across multiple segments rather than concentrating them in one location.
3Device complexity
If the clip has relatively flat spatial geometry, then the structure is simpler, but it cannot compensate for reduced pressing force caused by pad wear and plastic deformations
Solution Approach 1:
The patent creates a three-dimensional structure with arches and curved sections that protrude in the vertical dimension. This spatial geometry provides the necessary compliance and flexibility for the clip to adapt to changes in pad thickness, allowing it to compensate for pad wear and plastic deformations while maintaining stable pressing force.
Solution Approach 2:
The complex spatial geometry of the clip, with its arches and curved sections, provides dynamic compliance that allows the structure to deform and adapt to changing conditions. The clip can dynamically adjust its shape and stiffness characteristics to compensate for pad thickness reduction, maintaining stable pressing force throughout the service life.
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 clip fastener achieves higher stability of the rail pressing force, reduced stress concentration, and extended lifespan by distributing stresses more uniformly over the clip's structure, ensuring effective material usage and maintaining pressing force stability despite pad thickness reduction.
Implementation Method 1
made of a resilient rod bent to form a single B-shaped part... providing increased compliance and uniform stress distribution
Data Source
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AI summary
The invention relates to a design of a track structure for railways, namely to a design of a spring rod-shaped clip fastener for a use in intermediate rail fastenings for pressing a rail against a rail support. The spring rod-shaped clip fastener for a rail fastening is made of a resilient rod bent to form a single B-shaped part in the projection onto a horizontal plane, which is symmetrical relative to the transverse axis and consists of sections radially mated therebetween in the projection onto a horizontal plane, said sections comprising a section of resting on a rail, which is rectilinear in the projection onto a horizontal plane and changes on two opposite sides along rounding radii into side sections located perpendicularly to a track centerline and being rectilinear in the projection onto a horizontal plane, said side sections change into radial, in the projection onto a horizontal plane, sections of resting on a thrust member of the rail fastening, which change into end sections directed with their ends towards the section of resting on the rail and rectilinear in the projection onto a horizontal plane; the section of resting on the rail is made, in its longitudinal profile, convex radially with two edge points of resting on the rail; the sections of resting on the thrust member of the rail fastening are made radially concave in their longitudinal profile, and the side sections and the end sections are made radially convex in their transverse profile; and a value of an inner radius of the side sections in the transverse profile of the clip fastener is less than a value of an inner radius of the end sections. The technical effect is a higher stability of a force of pressing a rail against a rail support provided by the spring rod-shaped clip fastener due to its designed having complex spatial geometry, which reduces its stiffness, while maintaining its pressing force, due to an increased resilient motion of the clip fastener, and, simultaneously, provides the possibility of reducing stress concentration and raise the efficiency of using the material of the clip fastener owing to making a greater length of the rod operable.