CRANK DRIVE

摘要

The invention relates to a device comprising a crankshaft (100) and least one conrod (200) having a big end (202) mounted on a crank pin (102) of the crankshaft (100). The crank pin (102) and the big end (201) of the conrod ( 200) comprise bearing surfaces (108, 202) which are in close contact to one another in a load-bearing area that bear the forces acting between the big e nd (201) of the conrod and crank pink (102) when the device is operated. Acc ording to the invention the bearing surface (108) of the crank pin (102) in its load-bearing area features a concavely curved profile in the longitudina l shaft section and thebearing surface of the big end (201) features a conve x profile being in close contact with the concave profile of the crank pin ( 102).