Bearing positioning structure without radial interference fit

A bearing positioning structure without radial interference fit, which is used for a step of an escalator, the bearing positioning structure comprising:

• a bearing seat formed on both sides of the step of the escalator;
• a rolling bearing, a bearing inner ring of which is matched with a circumferential surface of the bearing seat, such that a step roller is installed on the bearing seat through the rolling bearing;
• wherein:
• the bearing positioning structure also comprises a bolt, a washer and a nut, the bearing seat has a central through hole coaxial with its circumferential surface, the bolt successively passes through the washer, the bearing inner ring of the rolling bearing, the central through hole and the nut, and the inner ring of the rolling bearing is axially clamped between the washer and an axial limit step of the bearing seat without radial interference fit between rolling bearing and circumferential surface by tightening the nut.