| Popis: |
Friction units, in which the sliding surfaces are separated by a film of liquid lubricant, generally, consist of three elements: a journal, a lubricating film and a bearing. Such tribounits are often referred to as journal bearings. Tribounits with the hydrodynamic lubrication regime and the time-varying magnitude and direction of load character are hydrodynamic, heavy-loaded (unsteady loaded). Such tribounits include connecting-rod and main bearings of crankshafts, a ”piston-cylinder” coupling of internal combustion engines (ICE); sliding supports of shafts of reciprocating compressors and pumps, bearings of rotors of turbo machines and generators; support rolls of rolling mills, etc. The presence of lubricant in the friction units must provide predominantly liquid friction, in which the losses are small enough, and the wear is minimal. The behavior of the lubricant film, which is concluded between the friction surfaces, is described by the system of equations of the hydrodynamic theory of lubrication, a heat transfer and friction surfaces are the boundaries of the lubricant film, which really have elastoplastic properties. During the simulation and calculation of heavy-loaded bearings researchers tend to take into account as many geometric, force and regime parameters as possible and they provide adequacy of the working capacity forecast of the hydrodynamic tribounits on the early stages of the design. |
