A property of precision angular contact ball
bearings is that they allow the creation of groups of two
or more units to obtain much higher load capacity and more
rigid assembly with the same overall diameter.
The simplest form of a set is a Duplex. This is an assembly
of two ball bearings together in various configurations (see
below).
Duplex
Back to Back (DD)
-symmetrical arrangement;
-possibility to withstand radial axial loads in two directions;
-high moment rigidity.
Face to Face (FF)
-symmetrical arrangement;
-possibility to withstand radial axial loads in two directions;
-low moment rigidity.
Tandem (T)
-the bearings must be identical;
-possibility to withstand one direction axial load, only;
-requires preloading by springs.
 Back
To Back (DD)
Face to Face (FF) Tandem
(T)
Multiple Sets
Groups with more than two bearings can be employed whenever
much higher load capacity and more rigid assembly are requested,
with the same overall diameter.
Groups formed with bearings of different
kinds
Duplex and Multiplex sets can be further varied by mixing
the contact angles and/or different sizes or series of bearings.
The only rule governing these sets concerns tandem groups,
which must be formed with identical bearings.
The main advantages, which these sets offer, are:
- optimization of load capacity and rigidity
- possibility to reduce bearing preload and, consequently,
to increase operation speed (for example, if preloading
bearings of a set have smaller contact angle than loading
bearings, the set preload can be reduced without affecting
the limiting axial load)
- smaller overall dimensions of the preloading bearings.
Designation Example:
EX80 7CE3T / EX75 7CE1 DDL
Group of 3 bearings, formed by 2 EX series bearings, tandem
arrangement, 80 mm bore, 25 contact angle and by 1 EX series
bearing, 75mm bore, 15 contact angle, back to back.
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GRW
Product Desc.