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EP-4735298-A1 - OVERHEAD CONDUCTOR RAIL AND OVERHEAD LINE SYSTEM WITH OVERHEAD CONDUCTOR RAIL

EP4735298A1EP 4735298 A1EP4735298 A1EP 4735298A1EP-4735298-A1

Abstract

The invention relates to an overhead conductor rail (2) for guiding a contact line (3) and to an overhead line system (1) having at least one overhead conductor rail (2), wherein the overhead conductor rail (2) and the contact line (3) consist of different materials and the overhead conductor rail (2) and/or the contact line (3) has a lubricant (4), wherein the lubricant (4) is applied as a substantially complete, uninterrupted film at least between the contact points (13, 14) of the overhead conductor rail (2) and the contact line (3), and the lubricant (4) has at least one additive, as a result of which the coefficient of friction between the overhead conductor rail (2) and the contact line (3) is increased to such an extent that the pull-out force of the contact line (3) rises to at least 1.2 kN/m, and ensures the conductivity between the overhead conductor rail (2) and the contact line (3).

Inventors

  • Geißler, Bastian
  • HAHN, GUNTER

Assignees

  • Siemens Mobility GmbH

Dates

Publication Date
20260506
Application Date
20240626

Claims (10)

  1. 1. Overhead conductor rail (2) of an overhead line system (1) for guiding a contact wire (3), wherein the overhead conductor rail has a lubricant (4) and wherein the overhead conductor rail (2) and the contact wire (3) are made of different materials, characterized in that the lubricant (4) is applied as a substantially complete, uninterrupted film at least between the contact points (13, 14) of the overhead conductor rail (2) and the contact wire (3), and the lubricant (4) has at least one additive, wherein the lubricant (4) with the at least one additive brings about a larger coefficient of friction with substantially constant electrical conductivity between the overhead conductor rail (2) and the contact wire (3).
  2. 2. Overhead conductor rail (2) according to claim 1, characterized in that the lubricant (4) with the at least one additive has a greater adhesive power with respect to the overhead conductor rail (2) and the contact wire (3).
  3. 3. Ceiling conductor rail (2) according to claim 1 or 2, characterized in that the at least one additive is aluminum oxide particles.
  4. 4. Ceiling conductor rail (2) according to one of the preceding claims, characterized in that the lubricant (4) comprises between 2 and 10% aluminum oxide particles.
  5. 5. Ceiling conductor rail (2) according to one of the preceding claims, characterized in that the lubricant (4) contains 5% aluminum oxide particles with a maximum deviation of 10%.
  6. 6. Overhead conductor rail (2) according to one of the preceding claims, characterized in that the lubricant (4) is applied to the contact points (13, 14) of the contact wire (3) to the overhead conductor rail (2) and to the part of the contact wire (3) which runs within the overhead conductor rail (2).
  7. 7. Overhead conductor rail (2) according to one of the preceding claims, characterized in that the lubricant (4) applied to the contact wire (3) has a thickness of between 100 and 500 micrometers.
  8. 8. Ceiling conductor rail (2) according to one of the preceding claims, characterized in that the ceiling conductor rail (2) is designed as an aluminum alloy extruded profile.
  9. 9. Overhead conductor rail (2) according to one of the preceding claims, characterized in that the contact wire (3) guided by the overhead conductor rail consists of copper or a copper alloy.
  10. 10. Overhead line system (1) with at least one overhead conductor rail (2) according to one of claims 1 to 9.

Description

Description Overhead conductor rail and overhead line system with overhead conductor rail In order to be able to reach inner-city areas with local trains such as the subway or light rail, or even with long-distance trains, railway lines are often inevitably laid in tunnels. Electric traction must be ensured even in confined spaces, for example in small or narrow tunnel cross-sections. For this purpose, low-profile overhead conductor rails are usually used. These can be driven on by one or more pantographs and, depending on the design, can be used not only in tunnels but also under bridges, on lifting bridges, and in maintenance facilities. The overhead conductor rail usually consists of an extruded profile into which a contact wire is clamped, via which the current is transmitted to the vehicle in question, as with a conventional overhead line in an overhead line system. The clamped connection must be electrically conductive. Depending on the structural conditions or requirements, different materials are used for the overhead conductor rails and for the contact wire, which may have different electrode potentials, so that there is a risk of contact corrosion, which can damage the overhead conductor rails, for example. In such cases, this is usually counteracted by the defined application of a lubricant, for example a lubricant or contact grease, between the different materials when the overhead conductor wire is pulled into the overhead conductor rail(s). Such a lubricant or contact grease usually acts as an insulator and maintains the necessary electrical conductivity through the addition of electrically conductive additives, in particular particles. When entering or leaving a tunnel, there is a transition from normal, conventional overhead line operation to overhead conductor rail operation and vice versa. In particular, when a vehicle exits a tunnel when transitioning to a catenary system, i.e. when transitioning from overhead conductor rail operation to conventional overhead line operation, tensile forces act on the contact wire outside the tunnel and can pull the contact wire out of the overhead conductor rail profile. Due to corresponding specifications due to increased safety requirements, the overhead conductor rail or the overhead conductor rail profile must now have a certain minimum clamping force which can withstand a pull-out force of the contact wire in the axial direction from the conductor rail, in particular the overhead conductor rail, of 1.2 kN/m, whereby at the same time the previous properties should not be restricted. However, the use of overhead conductor rails with conventional lubricating greases, for example contact greases in the necessary situations with different materials, tends to have a friction-reducing effect and thus reduces the minimum clamping force of the corresponding overhead conductor rails, so that this may no longer be sufficient to withstand the required pull-out force of the contact wire in the axial direction from the overhead conductor rail of 1.2 kN/m. The invention is based on the object of specifying a ceiling conductor rail with improved properties. The problem is solved by the features of independent patent claim 1. Further developments and refinements of the invention can be found in the features of the dependent patent claims. For this purpose, an overhead conductor rail of an overhead contact line system for guiding a contact wire with a lubricant is specified, wherein the lubricant is applied as a substantially complete, uninterrupted film at least between the contact points of the overhead conductor rail and the contact wire. is introduced , and the lubricant comprises at least one additive , wherein the lubricant with the at least one additive causes a larger coefficient of friction with substantially constant electrical conductivity between the overhead conductor rail and the contact wire . By adding at least one additive to the lubricant in question, the coefficient of friction between the overhead conductor rail and the contact wire is increased, which advantageously increases the pull-out force of the contact wire in the axial direction from the conductor rail or overhead conductor rail. At the same time, despite the addition of the at least one additive, the electrical conductivity between the overhead conductor rail and the contact wire remains essentially the same, whereby the quality of the current conduction and/or transmission is maintained at at least the same or comparable level and thus its quality is further guaranteed. Particularly preferably, the lubricant with the at least one additive has greater adhesion to the overhead conductor rail and the contact wire. Due to the improved or greater adhesion of the lubricant with the at least one additive compared to a lubricant without the at least one additive, the lubricant adheres more permanently to the overhead conductor rail and the contact wire, whereby contact corrosion due to differe