On the Latvian railway, derailments of freight cars take place in the course
of shunting work on marshalling yards. A number of factors during shunting work on
marshalling yards may contribute to the derailments of rolling stock: longitudinal
dynamics during braking of cars with the turned off brakes by locomotive, hauling down
cars from a marshalling hill with braking position controlled by an operator, dry internal
rails in curves, absence of greasing in the pivot unit of freight bogies. At present,
measures allowing elimination of the car derailments during shunting work are
developed.
During the period between repairs, the abutment unit of freight car often works in
conditions of dry friction. Our observations suggest that at the time of taking a car into
repair, there is often an absence of greasing between trail bearing and center plate of the
abutment, and a presence of sandy dust. It increases a friction and, together with high
contact pressures and dynamic influence, hinders the turn of bogie at motion of car.
In this paper, the results of studying the resisting moment in the abutment to turning of
bogie is reported. The study was conducted on the basis of freight bogie of type 18-100;
the body was leant on the center plate unit of the abutment, on the center plate unit, and
on the sliders. Experiments were conducted, with the use of greasing and at the dry
friction of center plate unit
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