AXIAL BEARINGS TAPERED ROLLERS –
The tapered rollers axial bearings allow the realization of compact axial system, they can support very high axial loads, they are insensitive to impacts and they are very stiff.
Being decomposable, types with cage can be installed assembling separately and easily two thrust rollers cylindrical types.
Since double-effect tapered rollers axial bearings are normally assembled with free coupling both on the neck of the cylinder and on the housing of the crankset, to prevent the rotation on the housing, the shaft washer is provied with one or two stopping carvings, where a key is inserted or by similar means.
Two types executions exist:
This execution, with plain central shaft washer, is the most common because it tollerate a light eccentricità of the shaft, according to the hole of the housing, to the order of the inner radial clearance of the radial bearing that combines them. Between shaft washers for housing there is a distance ring, in a manner proportionated that is possible to tighten fully the screws.
EXECUTION EZB.2 / EZB.3
These executions have tapered raceways on the shaft washers. Thanks to this they have a higher load capacity according to that with the plain central shaft washer and somehow they also can radially contrai the shaft.
ESECUZIONE 2: A STOPPING CARVING
ESECUZIONE 3: TWO STOPPING CARVINGS
Dimensions of tapered rollers axial bearings have not been unified
Except for some exceptions, tolerances of the hole and the inner diameter of the double-effect tapered rollers axial bearings are those normal according to ISO 199-1979. Tolerances on the height and on the rotation precision differ form normal values. On request an indication on values relating to a specific bearing is given.
The tapered rollers axial bearings with plain shaft washers do not allowed any misalignment of the shaft according to the housing, nor any mistake of squaring of supportino surfaces.