Basic concepts and terminology of rolling bearings

Basic concepts and terminology of rolling bearings
(1) life, a single rolling bearing life refers to the bearing of a collar (or washer) or rolling body material on the first signs of fatigue expansion, bearing a collar (or washer) relative to another collar (or washer) the number of revolutions rotated.
(2) Reliability (is the category of bearing life) refers to a group in the same conditions of operation, nearly the same rolling bearing expect to reach or exceed the percentage of the specified life. The reliability of a single rolling bearing for the bearing to meet or exceed the specified life probability.
(3) static load bearing collar or washer with each other relative speed is zero (centripetal or thrust bearing) or rolling parts along in the rolling direction of no movement (linear bearings), the role of the load on the bearing.
(4) dynamic load, when the bearing collar or washer relative rotation (centripetal or thrust bearings) or rolling elements along the rolling direction of movement (linear bearings), the role of the load on the bearing.
(5) rated life, to radial basic rated dynamic load or axial basic rated dynamic load based on the expected value of life.
6) Basic rated life: for the use of contemporary common quality materials and good processing quality and in the regular operating conditions of the bearing, the basic rated life refers to 90% of the reliability of the rated life.
7) Radial basic dynamic load rating - refers to a set of rolling bearings can theoretically withstand a constant radial load. The basic life rating of the bearing under this load is one million revolutions. For single-row angular contact bearings, the load is caused by the bearing rings with each other to produce pure radial displacement of the radial component of the load.
(8)) axial basic dynamic load rating: refers to a set of rolling bearing theory can withstand the constant centre of the axial load, in the role of the load, the basic rated life of the bearing for one million revolutions.
(9) radial (or axial) equivalent dynamic load ﹑ refers to a constant radial load (or the centre of the axial load), in the role of the load, rolling bearing with the actual load conditions of the same life.
(10) radial (or axial) basic static load rating ﹑ in the maximum load rolling body and raceway contact centre with the following calculation of contact stress corresponds to the radial static load (central axial static load): 460 OMPa self-aligning ball bearings (radial); 4200 MPa other types of centripetal ball bearings (radial) and thrust ball bearings (axial); 4000 MPa centripetal (radial) and thrust roller bearings (axial).
Note:1. For single-row angular contact ball bearings, its radial static load rating refers to the radial component of the load which makes the bearing collar purely radially displaced from each other.
2. In the static load conditions, these contact stress refers to cause the rolling body and raceway of the total permanent deformation of the rolling body diameter of about 0.0O01 times when the stress.

(11) radial (or axial) equivalent static load refers to the maximum load rolling body and raceway contact centre with the actual load conditions with the same contact stress of the radial (or central axial) static load.

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