There is a certain gap between the inner and outer rings of rolling bearings and the rolling elements, so there can be relative displacement between the inner and outer rings. When there is no load, one ring is stationary, and the amount of movement of the other ring from one limit position to the other along the radial and axial directions of the bearing is called radial clearance and axial clearance respectively. , according to the state of the bearing, the clearance is divided into three types:
(2) Installation clearance is also called matching clearance. It is the clearance when the bearing, shaft and bearing seat are installed but not yet working. Due to interference installation, either the inner ring is enlarged, the outer ring is reduced, or both, the installation clearance is smaller than the original clearance.
(3) Working clearance: The clearance of a rolling bearing in the working state. During operation, the temperature rise of the inner ring is the largest and the thermal expansion is the largest, which reduces the bearing clearance. At the same time, due to the effect of load, elastic deformation occurs at the contact between the rolling element and the raceway. To increase the bearing clearance, whether the working clearance of the bearing is larger or smaller than the installation clearance depends on the combined effect of these two factors.