l) Life. The life of a single rolling bearing means that before the first sign of fatigue expansion appears on a ring (or washer) or rolling element material of the bearing, one ring (or washer) of the bearing is relative to the other ring (or washer). ) The number of revolutions of rotation.
2) Reliability (belonging to the category of bearing life) refers to the percentage of a group of rolling bearings operating under the same conditions that are close to the same expected to reach or exceed the specified life. The reliability of a single rolling bearing is the probability of the bearing reaching or exceeding the specified life.
3) Static load The load acting on the bearing when the relative speed of the bearing ring or washer is zero (centripetal or thrust bearing) or when the rolling parts are not moving in the rolling direction (linear bearing).
4) Dynamic load, the load acting on the bearing when the bearing ring or washer rotates relative to each other (centripetal or thrust bearing) or when the rolling elements move in the rolling direction (linear bearing).
5) Rated life, the expected value of life based on the radial basic dynamic load rating or the axial basic dynamic load rating.
6) Basic rating life: For bearings that use contemporary high-quality materials and have good processing quality and operate under normal operating conditions, the basic rating life refers to the rating life related to 90% reliability.
7) Radial basic dynamic load rating-refers to the constant radial load that a set of rolling bearings can withstand theoretically. The basic rating life of the bearing under this load is one million revolutions. For single row angular contact bearings, the load refers to the radial component of the load that causes the bearing rings to produce pure radial displacement between each other.
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8) Axial basic dynamic load rating: refers to the theoretically constant central axial load that a set of rolling bearings can withstand. Under this load, the basic rating life of the bearing is one million revolutions.
9) Radial (or axial) equivalent dynamic load refers to a constant radial load (or central axial load) under which the rolling bearing has the same life as under actual load conditions.
10) Radial (or axial) basic static load rating. The radial static load corresponding to the following calculated contact stress (center axial static load) is generated at the contact center of the maximum load rolling element and the raceway (center axial static load): 460OMPa self-aligning ball Bearings (radial); 4200MPa other types of radial ball bearings (radial) and thrust ball bearings (axial); 4000MPa radial (radial) and thrust roller bearings (axial).
Note:
1. For single row angular contact ball bearings, the radial static load rating refers to the radial component of the load that causes the bearing rings to move purely radially with respect to each other.
2. Under static load conditions, these contact stresses refer to the stresses that cause the total permanent deformation of the rolling elements and raceways to be about 0.0O01 times the diameter of the rolling elements.
11) The radial (or axial) equivalent static load refers to the radial (or central axial) static load that produces the same contact stress as the actual load condition at the contact center of the maximum load rolling element and the raceway.
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