The article presents the results of a geometrical surface texture study of cycloid drive discs after bench tests.
For this purpose, the working surfaces, such as peak and valley areas of the epicycloid and the holes inner
surfaces of both discs, were investigated using contact profilometry. From each surface, a transverse profiles
were extracted, before and after 50 cycles of bench test. The discs and the profiles were examined for signs
of wear and roughness changes. For each profile, the Ra and Rz roughness parameters were determined. On
the base of the obtained profiles and the values of roughness parameters, it can be stated that the assumed
test parameters provide stable working conditions, with an uninterrupted lubrication film, which results in
practically negligible and unmeasurable wear. Taking into account the operating specification of a helicopter
winch as an example of potential application of the presented cycloidal drive, the developed solution fulfils
the requirements concerning wear resistance.