| 摘要 |
The present invention relates to a crank-drive (1) with a crank-shaft (10), at least one connecting rod (11) and at least one piston (12), in particular a crank-drive (1) of an internal combustion engine, whereas the crank-shaft (10) features at least one radial bearing (13) for supporting the crank-shaft (10) in a crank-housing (14), at least one radial bearing (15) for connecting the connecting rod (11) to the crank-shaft (10), and the connection of the connecting rod (11) to the piston (12) features at least one radial bearing (16) and whereas the bearings (13, 15, 16) feature a bearing inner surface (17) and/or a bearing outer surface (18). According to the invention in at least one of the bearing surfaces (17, 18) are arranged micro-ramp structures (19) with an asymmetric form having a first concave section (20) between the bearing surface (17, 18) and a bottom point (21) of the micro-ramp structure (19) and a second concave section (22) between the bottom point (21) and the bearing surface (17, 18), whereas between the micro-ramp structures (19) are arranged sections of the bearing surface (17, 18). |
