Spherical roller bearings with two rollers, mainly bear radial load, but also can withstand axial load in either direction. A high radial load capacity, especially suitable for heavy work loads or vibration, but can not afford pure axial load. This kind of bearing outer ring raceway is spherical shape, so the self-aligning performance is good, can compensate concentricity error.
There are two symmetrical spherical roller, there is a common spherical outer ring raceway, and the bearing inner ring with two axis tilt angle of the roller, with good self-aligning performance, when the axial force bent or install a different heart while still bearing the normal use, transfer concentric with the bearing size range varies, generally allow aligning angle is 1 to 2.5 degrees, the type of bearing a larger load capacity, in addition to radial load bearing can withstand double-acting axial load, and has good impact resistance, generally spherical roller bearings allow lower operating speed.
Spherical roller bearings on roller-sectional shape into symmetrical spherical roller and non-symmetrical spherical roller two different structures, asymmetric spherical roller bearings are early products, mainly for the host service, the new design host are rarely used when symmetrical spherical roller bearings, the internal structure has been completely improved design and parameter optimization, and early production of spherical roller bearings, can withstand greater axial loads, this bearing operating temperature low, it can be adapted to the requirements of high speed, according to the inner ring without ribs and used the cage can be divided into two kinds of type C and CA, C-type bearings are characterized by inner wall and the use of steel stamping cage, CA-based Terui En bearing characteristics compared to the inner wall and the use of vehicles on both sides solid cage in order to improve the lubrication, can provide users with an outer annular groove and three oil bore spherical roller bearings, the bearing post code / W33 said that according to the user's requirements are also available with the inner hole of the self-aligning roller bearings, in order to facilitate customer handling and replacement of bearings, also available with bore spherical, tapered roller bearings, tapered bore, taper 1:12 later code-named K said that in order to meet the special requirements of users are also available 1:30 taper bearings, then code-named K30 within tapered bore bearing locknuts are available directly mounted on the bearing tapered journal, but also can make use of an adapter sleeve or withdrawal sleeve will be installed in the cylindrical journal bearing. In order to ensure that the bearing at high speed centrifugal effect to prevent the raceway and roller harmful slip between the bearing should bear a certain minimum radial load size can be estimated:
Fr = 0.02C
Where
Fr - minimum radial load N
C-bearing basic dynamic load N
Equivalent dynamic load
P = Fr Y1Fa when Fa / Fr e when
P = 0.67Fr Y2Fa when Fa / Fr e when
Where
P-equivalent dynamic load N
Y1 Y2-axial dynamic load factor
Equivalent static load
P0 = Fr Y0Fa
Where
P0-equivalent static load N
Y0-axial static load factor