High-Speed Switch Rail Inertia and Profile Design
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Solution Overview
Problem
Current rail technologies for high-speed railway networks, particularly in Russia and other former Soviet Union countries, face challenges in maintaining compatibility with existing standards while ensuring durability and performance at speeds exceeding 250 km/h, due to insufficient moment of inertia and wear issues at switch and crossing points.
Innovation Solution
A switchgear design featuring a counter-needle and needle rail with inclined running surfaces, where the needle rail is forged and machined to enhance vertical and lateral inertia, allowing for a compatible and durable solution that can withstand high speeds without extensive machining, thus maintaining compatibility with Russian and European standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the head of the switch rail is machined to achieve a 1/20 inclined running surface, then compatibility with high-speed rail standards is improved, but the moment of inertia becomes insufficient leading to premature wear and damage
Solution Approach 1:
The patent changes the geometric parameters of the switch rail head by introducing a specific inclination angle (1/20) of the running surface relative to the horizontal, while simultaneously adjusting the dimensions of the head and web to maintain adequate moment of inertia. This parameter optimization allows the rail to meet high-speed rail standards while preserving structural strength.
2Reliability
If a European type 60D20 switch rail profile with 1/20 inclination is used, then the inclined running surface is achieved, but compatibility with Russian R65 running track rail is lost due to incompatible lateral moments of inertia
Solution Approach 1:
The patent applies local quality by giving different sections of the switch rail different characteristics: the head portion has a 1/20 inclined running surface to meet high-speed requirements, while the web and foot portions maintain dimensions compatible with the Russian R65 profile. This localized differentiation allows the single rail component to satisfy multiple conflicting requirements.
3Strength
If the switch rail is forged and machined to enhance vertical and lateral inertia, then durability at high speeds is improved, but manufacturing complexity and machining requirements increase
Solution Approach 1:
The patent employs preliminary action by incorporating the enhanced moment of inertia design into the forging stage itself, creating a rail head with optimized mass distribution before machining. This preliminary shaping reduces the amount of subsequent machining required while ensuring the rail achieves the necessary vertical and lateral inertia for high-speed durability.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Track switch comprising a cut-off point (1) and a switch (9) made from a switch rail, each comprising a head (2, 10), a web (3, 11) and a foot (4, 12) consisting of wings extending on either side of the lower end of the web (3, 11), said cut-off point (1) and said switch (9) each having a distal part and a proximal part, the latter being located on the side of the foot (12) of the switch (9) which is connected to a rail of the running track, the heads (2, 10) of the cut-off point (1) and of the switch (9) each having a running surface inclined at least 1/60, with respect to the horizontal and a wear profile identical to that of the running track. The mushroom (10) is tapered by machining the needle rail and the pad (12) is formed solely by rolling, without machining. The proximal part of the needle rail is formed by forging or by forging and machining.The vertical inertia (lx) of the switch (9) is greater than or equal to 66% of the vertical inertia (lx) of the check rail (1) and the running track. The minimum lateral inertia (ly) of the switch (9) is at least equal to 100% of the minimum lateral inertia (ly) of the check rail (1) and the running track. The clearance (E) between the end (22) of the switch (9) shoe (12) and the check rail (1) is at least 2 mm when the switch (9) is pressed against the check rail (1). When the switch (9) is pressed against the check rail (1), the contact length between them represents at least 80% of the length of the inclined contact face (16) of the check rail (1).