Crankshaft, bearing assembly and large multi-cylinder two-stroke diesel engine

摘要

A crankshaft (1) for a reciprocating piston engine (10) or compressor. The crankshaft (1) has a plurality of throws (2) that are interconnected by main journals. The main journals (5) have a main journal bearing surface with a given width (W) between the two axial ends of (42,43) of said main journal bearing surface (40). At least one receding area (45) is provided in the main journal bearing surface (40) of at least one of the main journals (5). The at least one receding area (45) adjoins one of the two axial ends (42,43) and the receding area (45) has a depth (y) that generally decreases in the axial direction away from the one of the two axial ends (42,43) that the receding area (45) adjoins. A bearing assembly with a plurality of main bearings (62,80,86,87) and a crankshaft (1) as above. A large multi-cylinder two-stroke diesel engine of the crosshead type or a large compressor of the crosshead type with a crankshaft as above or with or a bearing assembly as above.