engleski

Influence of covered mileage on tram wheel wear

Tram wheel wear plays an important role in maintenance of every tram system. Zagreb Municipal Transit System (ZET) has recently acquired 140 new low-floor trams (CROTRAM TMK 2200) that started their operation and is about to acquire additional 60 low-floor trams (CROTRAM TMK 2300). In order to predict time for wheel re-profiling and eventually wheel replacement extensive investigation of wheel rim wear had to be made. Precisely predicted behaviour of rim wear, dependent on covered mileage, gives valuable information to maintenance department in order to anticipate and schedule wheel rim reprofiling and eventually order new wheel rims for replacement, thus achieving uninterrupted operation of a tram. This paper describes an investigation of wheel rim wear on several trams (TMK 2200) operating on Zagreb tram network. Trams were selected depending on the covered mileage including, completely new trams (5, 103 km) up to 5 years old trams (98, 977 km). Using precise digital measuring device “GRAW Wheel profile gauge A-B”, specially redesigned for this purpose (in order to fit the tight clearance space under a low-floor tram), precise wheel profiles were acquired and investigated. Analysis of the measurement results correlated wheel rim wear with covered mileage of a tram as well as with the position of a wheel on a tram (front, middle or rear bogie).

Tram wheel; rim wear; covered mileage

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