Railway Track Expansion Device Continuous Rolling Surface
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Solution Overview
Problem
Existing railway track expansion devices experience wear and deterioration at the proximal portions near the distal ends, leading to discontinuity in wheel support, noise, and inconvenience, especially due to transverse thinning of rails, which is not effectively addressed by prior art.
Innovation Solution
The introduction of first and second distal devices extending from the distal portions to the proximal portions, forming additional continuous rolling surfaces that complement the central device, ensuring continuous support and reducing wear by providing wider rolling surfaces that match or exceed the width of the distal and proximal portions, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the proximal portions of rails are transversely thinned to allow expansion, then the expansion capability is improved, but wear and deterioration occur at the proximal portions near the distal ends
Solution Approach 1:
The rail structure is divided into distinct segments: the original proximal portion, the added distal device with its own running surface, and the distal portion. This segmentation allows the thinned proximal portion to maintain expansion capability while the separate distal device provides additional support and reduces wear at the transition zone.
Solution Approach 2:
The solution extends the running surface in the longitudinal dimension by adding the distal device, which provides an additional running surface that projects beyond the distal end of the proximal portion. This dimensional extension allows the wheel to roll continuously from the thinned proximal portion through the expansion gap to the distal portion without concentrating wear at the proximal-distal transition.
2Device complexity
If the central device is used alone to provide continuous support, then the structure remains simple, but discontinuity in wheel support occurs due to wear at the proximal portions
Solution Approach 1:
The distal device is installed in advance to provide preliminary support before the wheel reaches the expansion gap. This preliminary action ensures that the wheel has a continuous running surface to follow, preventing discontinuity and reducing the impact of wear at the proximal portions near the distal ends.
3Volume of stationary object
If the running surface width is reduced at proximal portions, then the expansion space is increased, but wear and creep occur in the proximal portion material
Solution Approach 1:
The distal device acts as an intermediary element between the thinned proximal portion and the distal portion. It provides an additional running surface that distributes the wheel load, reducing stress and creep in the proximal portion material while maintaining the necessary expansion space.
Data Source
Figure 1
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AI summary
Apparatus (1) for a railway track traversed in a longitudinal direction (L) by a railway vehicle having at least one wheel (5), the apparatus comprising a first rail (20) and a second rail (25) extending longitudinally one in line with the other, and separated by a gap (30). The rails comprise a proximal portion (61, 75) and a distal portion (63, 77) defining respectively running surfaces (69, 73, 81, 82) situated in the same running plane (P). A central device (35) extends longitudinally from the proximal portion of the first rail to the proximal portion of the second rail and forms a continuous central running surface (91) from a first point (A) to a second point (B) projected onto the longitudinal direction.A first distal device (40) and a second distal device (45) extend longitudinally from the distal portion to the proximal portion of the first and second rails respectively, and form, respectively, in the running plane, two additional running surfaces (97, 105) continuous respectively from a third point (C) to the first point, and from the second point to a fourth point (D) in projection onto the longitudinal direction. Corresponding method.