CZ20032851

• Main Authors: STAUDER NORBERT, KUTTNER THOMAS DR
• Format: Patent
• Language: English
• Published: 14.04.2004
• Edition: 7
• Subjects: BEARINGS; BLASTING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; PERFORMING OPERATIONS; PREVENTING DERAILING OF RAIL VEHICLES; RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES ORARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; RAILWAYS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAILVEHICLES

The invention relates to a method for preventing press fit damages to wheelsets, particularly to wheelsets of rail vehicles. To this end, the surface of a wheelset shaft is treated before subsequently joining of the wheelset. The aim of the invention is to develop a method, which cost-effectively protects the wheel seats from press damages by means of a special surface treatment, which is adapted to current maintenance technologies, and which avoids structural changes to existing wheelset designs. To this end, the invention provides that, first of all in at least one step, the wheelset shaft is longitudinally turned or longitudinal ground in its cylindrical and conical end area, and the resulting transition is smoothed and/or rounded whereby subsequently treating the surface of the wheelset shaft using a plasma ion implantation method. During this treatment, a finely distributed powder that reduces coefficients of friction, especially a powder containing sulfide, is applied to the rotating wheelset shaft under atmospheric pressure while using a cold plasma that contains reactive gas serving as a carrier gas. The powder is applied in such a manner as to construct, on the nanometer and/or micrometer scale, a very hard metallic slide layer having a low adhesiveness. In the event of the highest contact pressures between the wheelset shaft and the wheel, a solid lubrication, which prevents press damages, is produced immediately after the lubricant film has been ruptured.