Automatic tensioning roller device for drive chain or drive belt in automobile engine with amorphous carbon coating applied to surface of fixed carrier or opposing surface of pivoted component for tensioning roller

摘要

The tensioning roller device has a fixed carrier (4) and a pivoted component (2), supporting a tensioning roller, displaced relative to a surface (3a) of the fixed carrier with a surface (12) in contact with the latter, either or both of the surfaces providing with a coating (34) of an amorphous carbon, with a hardness of between 800 and 2500 HV.