FRICTION MINIMIZED CRANK-DRIVE

摘要

The present invention relates to a crank-drive (1) of an internal combustion machine with a crank-shaft (2) having at least one main bearing journal (3) with a surface (4) for supporting the crank-shaft (2) in a crank-housing and having at least one pin bearing journal (5) with a surface (6) for connecting a connecting rod (7) to the crank-shaft (2), and with a piston (8) having a piston bearing journal (9) with a surface (10) for connecting the piston (8) to the connecting rod (7). According to the invention that at least one of the surfaces (4, 6, 10) features at least one recess area (11) extending in a circumferential direction of the surfaces (4, 6, 10) over a circumferential angle (α1, α2) in a range from 20° to 120°.