Composite Wheelset Axle Protection for Rail Vehicles
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Solution Overview
Problem
Existing ballistic protection arrangements for rail vehicle wheelset axles are heavy, inefficient for high speeds, and require extensive maintenance due to corrosion and surface damage from environmental factors, leading to increased maintenance costs and reduced vehicle availability.
Innovation Solution
A lightweight ballistic protection arrangement using a composite material with a first layer of polyethylene fibers for energy absorption and a second layer of steel or titanium for high tensile strength, secured with a zipper for easy assembly and disassembly, reducing mass and inertia while providing effective protection against deformation and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional half-shell protection devices are used, then protection against stone impacts is achieved, but the mass and inertia of the wheelset axle increase significantly
Solution Approach 1:
The patent applies composite materials by combining a fiber-reinforced plastic matrix with embedded metal strips (steel, aluminum, or titanium). This composite structure provides high strength and impact resistance against stone impacts while maintaining low density and weight, resolving the contradiction between protection strength and moving mass.
2Strength
If thicker half-shells are used for speeds above 250 km/h, then protection effectiveness increases, but the mass and required drive power increase
Solution Approach 1:
The fiber-reinforced plastic composite with metal strips provides high strength-to-weight ratio, enabling effective protection at speeds above 250 km/h without the mass penalty of thicker traditional half-shells. This reduces the inertia and required drive power while maintaining protection effectiveness.
3Reliability
If numerous or thicker fastening straps are used, then secure fastening is achieved, but the mass, inertia, and assembly effort increase
Solution Approach 1:
The patent merges the protection function and fastening function into a single integrated shell structure. The shell itself is designed to be fastened directly to the wheelset axle, eliminating the need for separate numerous or thick fastening straps. This reduces the number of components, assembly effort, and overall mass while maintaining secure fastening.
4Loss of energy
If a single-layer fiber-reinforced plastic is used, then energy absorption is achieved, but tensile strength is insufficient
Solution Approach 1:
The patent creates a composite material system where a fiber-reinforced plastic matrix (providing energy absorption through fiber pull-out and matrix deformation) is combined with embedded metal strips (providing high tensile strength). This composite structure simultaneously achieves both energy absorption and high tensile strength that a single-layer fiber-reinforced plastic cannot provide alone.
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 solution achieves high energy absorption and tensile strength with a thin, lightweight design, suitable for speeds up to 380 km/h, reducing maintenance needs and enhancing vehicle availability while minimizing mass and space requirements.
Implementation Method 1
The use of a primary fiber material, which may, for example, contain polyethylene fibers, results in high energy absorption or damping of objects (e.g., basalt stones with a mass of up to 250 g) that strike the wheelset axle
Implementation Method 2
The second layer of material results in high tensile strength of the ballistic protection arrangement and thus advantageous resistance against impacting objects (e.g. stones etc.)
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a ballistic protection arrangement for vehicles, in particular for chassis of rail vehicles, with at least one first wheelset (1) which has a first wheel (2), a second wheel (3) and a wheelset shaft (4). In order to provide advantageous construction conditions, it is proposed that a shell (5) which comprises at least one first material layer (6), which comprises a first fibre material, can be arranged around the wheelset shaft (4). This results in advantageous protection of the wheelset shaft (4) from damage, for example due to stone impacts at particularly high travelling speeds and at particularly low temperatures. Furthermore, the first fibre material of the first material layer (6) brings about high absorption of energy with the protection arrangement at the same time having a low mass.