Scientific paper ID 2117 : 2021/3

In the designs of passenger bogies are built-in devices, that create return

force, which elastically obstructing the deviations of the car body of the passenger car from

the middle position. Such a device is the swing device from the secondary spring suspension

of passenger bogies - swing type. As a basic element from the secondary spring suspension of

these bogies are swing pendants. The publication presents a calculation method of a swing

suspension for fatigue strength, characterized by virtual simulation of the operational loads

of units and elements of the passenger bogie with the help of a selected representative

operational railway section, through which adequate reporting is ensured reporting the

damaging effect of all depreciation cycles (or maintenance). A future presentation of a strong

notion has been established pronounced degree dependence on reliability indicators of the

studied structure pendants of the coefficient of friction in the joints. The reason for the

accelerated destruction by fatigue of swing pendants are the occurrence of inadmissible

normal stresses of cyclic nature, arising from bending moments due to high values of the

coefficient of friction in the joints when the main bending moments act together. The results of

the conducted research on the swing suspensions of a passenger bogie are considered

sufficiently reliable, because they show good compliance with operating data.