Page 673 - Rollingbearings

Designs and variants
Matched bearings arranged TDO design bearings
in tandem
• have one double row outer ring (double
• have load lines that are parallel (ig. 12) cup) and two inner rings with roller and
• share radial and axial loads equally cage assemblies (cones), usually with an
• are used when the load carrying capacity intermediate ring between the two inner
of a single bearing is inadequate rings (ig. 13)
• can accommodate axial loads in one direc- • have rows of rollers arranged back-to-
tion only back (load lines diverge toward the bearing
If axial loads act in both directions, a axis), which enable stiff arrangements and
third bearing must be added and adjusted accommodate considerable tilting
against the tandem pair moments
• are supplied with intermediate inner and • are ready-to-mount units, manufactured
outer ring spacers as a set with the predetermined axial clearance or
preload
• can be used either as locating or non- Fig. 12
locating bearings: Matched bearings arranged in tandem
Double row tapered – for non-locating arrangements, the
roller bearings axial displacement should take place
between the outer ring and the housing
bore
SKF manufactures double row tapered roller – bearings with a blind hole or locating
bearings in the TDO (ig. 13) and TDI (ig. 14) slot in the outer ring can be used with a
designs, in many variants and with different cylindrical pin engaged in the hole or
features slot to prevent the outer ring from turn-
Depending on the design, these bearings ing in its seat
can accommodate heavy radial loads, axial
loads in both directions and have a high SKF manufactures TDO design bearings in
degree of stiffness Therefore, they provide a many variants (table 1, page 672)
stiff bearing arrangement and locate the
shaft in both directions with a speciic axial Fig. 13
clearance or preload Because of their sec- TDO design
ond row of rollers, double row tapered roller 8
bearings are suitable for heavy radial and
axial loads
Double row tapered roller bearings are
typically used in gearboxes, hoisting equip-
ment, rolling mills and machines in the min-
ing industry, e g tunnelling machines

Fig. 14
TDI design

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