Bearings are machine elements that are used for carrying, guiding or suspending moving parts (shafts, shafts, wheels, etc.) on idle parts (stands, housings, etc.). In addition to transferring forces from one machine part to another, their main task is to reduce friction between them. According to the direction of action of the forces, the bearings can be transverse and longitudinal:  transverse or radial bearings transmit only forces perpendicular to the bearing axis,  longitudinal or axial bearings assume those forces acting in the direction of their axis.  There are also combined, radial-axial bearings. According to the type of operation, the bearings are divided into:  sliding bearings (bearings with sliding friction) and  rolling or roller bearings (rolling bodies such as balls, rollers and needles are installed). On ships, bearings are applied in almost all rotating machines, but in this final thesis only bearings used in propulsion machines will be mentioned.