Overrunning clutch and a rolling bearing united in a casing

摘要

An assembly includes an overrunning clutch, a rolling bearing and a casing supporting them. An overrunning clutch-supporting portion of the casing has inwardly protruding portions that inter-engage with raised portions on an outer ring of the overrunning clutch in the direction of rotation of the outer ring. As a result, a clearance is defined between the inwardly protruding portions of the overrunning clutch-supporting portion and the raised portions of the outer ring. The overrunning clutch is automatically centered to a rotation shaft when used. An elastic ring is interposed in a predetermined compressed state between the outer ring and the overrunning clutch-supporting portion. Frictional resistance is produced between the outer ring and the overrunning clutch-supporting portion preventing the overrunning clutch from becoming shaky in the casing. The overrunning clutch is pressed against the casing by a spacer to produce the same frictional resistance between the overrunning clutch and the casing.