Engine for vehicle, has belt roller comprising external mobile ring rotated with respect to internal ring, and fixation screw extended from exterior of case and fixing internal ring against wall of case

摘要

The engine (10) has a case (14) comprising a wall (16), and a belt roller (18) e.g. tensioning roller, provided in the case. The roller has an external mobile ring (22) rotated with respect to an internal ring (20). A fixation screw (24) is extended from the exterior of the case and fixes the internal ring against the wall of the case. The internal ring is larger than the external ring along an extension direction of the screw.