One, the basic rating life and the basic dynamic load rating
The so-called bearing life, for a single rolling bearing, refers to the one ring or a rolling body material fatigue pitting before appearing for the first time, a ring relative to the other can running rpm.
Because of the same batch of bearing (structure, size, material, heat treatment and machining in exactly the same), make the life experiment under identical operating conditions, fatigue life of rolling bearing is quite discrete, so only use the basic rating life as a selection of bearing standard.
The basic rating life refers to a group of the same bearing, operating under the same conditions, total revolution of which 90% of the bearing before fatigue pitting can run (in turn as a unit) or under a certain speed to the operation of the total hours worked.
The basic dynamic load rating of C: when the basic rating life bearing for rotating, load bearing can withstand value.
The basic dynamic load rating, the radial bearing, refers to the pure radial load, and referred to as the basic dynamic radial load rating, with representation; on the thrust bearing, refers to pure axial load, and referred to as the basic dynamic axial load rating, with representation; angular contact ball bearings and tapered roller bearings, refers to the the radial component of load between the ferrule produced only pure radial displacement of the.
Bearing different types have different basic rated dynamic load value, it characterizes the different types of bearing size bearing capacity.