The radial (axial) play of a bearing is the radial (axial) movement of a ring relative to the other ring from a radial (axial) limit to an opposite extreme when no load is applied to the bearing, distance. In practice, due to the misalignment of the ferrules and the inconsistency of the rolling elements, it should take the average of the radial (axial) displacements in different directions of the ferrule and in different relative positions of the ferrule and the rolling element.
Clearance is an important bearing of the technical parameters, it directly affects the bearing load distribution, vibration, noise, friction, temperature rise, service life and mechanical precision and other technical performance. Excessive clearance can cause the bearing inner bearing area decreases, the contact surface stress increases, resulting in shortened service life.
Excessive clearance can cause the bearing inner bearing area decreases, the contact surface stress increases, resulting in shortened service life. Excessive clearance will also reduce the accuracy of bearing operation, vibration and noise increase. The clearance is too small, may appear in the actual operation of negative clearance (interference), causing increased friction heat, temperature rise, and thus make the effective clearance smaller or greater interference, so vicious cycle will lead to bearing dead.