Track Rail Fastener Structure for Shear-Resistant Vibration Isolation
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Solution Overview
Problem
Existing track rail fasteners experience performance degradation and potential failure due to significant shear stresses and dimensional changes caused by heavy loads, vibrations, and temperature variations, particularly in direct fixation designs where non-metallic materials are used between metallic rail plates and frames.
Innovation Solution
A track rail fastener design featuring a rail plate with restraint holes and a frame with vertical protrusions, sandwiched by a non-metallic cushion that isolates and stabilizes the rail plate and frame, reducing shear forces and enhancing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a non-metallic material is positioned between the rail plate and frame in a direct fixation fastener, then the fastener provides isolation and cushioning, but the non-metallic material is subjected to significant shear stresses resulting in performance degradation and potential failure
Solution Approach 1:
The fastener system is segmented into distinct functional zones: the non-metallic cushion material handles vibration isolation and compression, while the metallic protrusions handle shear loads and structural connection. This segmentation allows each component to operate within its optimal stress range, preventing the non-metallic material from experiencing damaging shear stresses.
Solution Approach 2:
The metallic protrusions act as intermediary elements that transfer shear forces around the non-metallic cushion material rather than through it. The protrusions penetrate through the cushion material, creating a mechanical interlock that allows the soft material to remain compressed and isolated from direct shear stress paths.
2Loss of energy
If the non-metallic cushion material is compressed between the rail plate and frame, then vibration attenuation is improved, but the cushion material may deform excessively under heavy loads
Solution Approach 1:
The non-metallic cushion material functions as a flexible element that can deform under load to absorb vibration energy, while the metallic protrusions provide structural reinforcement that prevents excessive deformation. The protrusions act as internal stiffeners within the flexible cushion material.
Solution Approach 2:
The fastener system combines metallic and non-metallic materials with complementary properties: the metallic protrusions provide high strength and rigidity to resist shear forces, while the non-metallic cushion material provides vibration damping and compliance. This composite structure allows both materials to contribute their advantageous properties without suffering from their individual weaknesses.
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 attenuates vibrations and reduces shear forces, improving the service life and stability of the fastener system by limiting displacement and separation of rail plate and frame components.
Implementation Method 1
The non-metallic cushion extends horizontally between the rail plate lower surface and the frame upper surface, and vertically upward, between the rail plate and each of the first vertical protrusion and the second vertical protrusion
Implementation Method 2
a non-metallic cushion extending horizontally between the rail plate lower surface and the frame upper surface, and vertically upward, between the rail plate and each of the first vertical protrusion and the second vertical protrusion, within the first restraint hole and the second restraint hole, respectively
Data Source
AI summary
A direct fixation track rail fastener includes a rail plate having a first restraint hole and a second restraint hole upon opposite lateral sides of a rail support surface. The fastener also includes a frame including a first vertical protrusion and a second vertical protrusion received through the first restraint hole and the second restraint hole. A non-metallic cushion extends between the rail plate and the frame and vertically upward to surround the first vertical protrusion and the second vertical protrusion within the first restraint hole and the second restraint hole, respectively. The configuration assists in limiting displacement of the rail plate and frame relative to one another.