ANALYSIS OF THE NORMS OF THE TRAM RAIL TRACK AND THE TRANSMISSION OF THE TRAMWAY CARS  IN THE CITY OF SOFIA

Emil M. Mihaylov; Vladimir Zhekov

Scientific paper ID 1680 : 2018/3

ANALYSIS OF THE NORMS OF THE TRAM RAIL TRACK AND THE TRANSMISSION OF THE TRAMWAY CARS IN THE CITY OF SOFIA

Emil M. Mihaylov, Vladimir Zhekov

This material compares and analyzes the current active norms for the tram rail track and the transmission of the tramway cars operating in the city of Sofia. The study has been conducted in order to find out the reason for the different type and degree of wear on the rails and the tram wheels. Under examination are the regulations defining the ments for the tramway track and the chassis of the tram. No link has been established with the introduction of various norms. In the material, the norms are compared and an ”equivalent conicity” criterion is analyzed, an earlier study of the problem has also been taken into account. The possible nine combinations of the border dimensions of the wheelsets are examined in a section of the track built with grooved and vinyl rails. It has been discovered that in a track built with grooved rails, in two of the cases the wheelset may become jammed. With lower track tolerance and upper wheelset tolerance there is jamming on the working side of the flanges. With upper track tolerance and lower wheelset tolerance, contact of the wheel flange head and the rail flange occurs significantly before reaching the working part of the flange of the other wheel with the rail head. Analysis of the problem through the criterion of ”equivalent conicity” indicates that in these variants there is also an unfavorable contact between the track and the wheelset. On the basis of these analyzes, it is recommended to synchronize the regulations for the tramway track and the transmission of the tramway cars.

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трамвайна мотриса коловоз норми трамваен релсов път колоосиtramway car track norms tramway rail track wheelsetsEmil M. Mihaylov Vladimir Zhekov

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