DINTECHNICAL INFORMATION

DUPLEX paired bearings

DUPLEX bearings consist of an assembly of two PAIRED bearings which provide the following advantages:

● radial displacement reduced to a minimum

● increase of the radial and axial load capacity

● accurate axial positioning with axial loads

● extremely accurate functioning

WIB supplies DUPLEX bearings with the following configurations:

● 0 arrangement called DB (back-to-back)

● X arrangement called DF (face-to-face)

These assembly configurations are used for applications where no bearing clearance can be tolerated and where a high degree of stiffness of the whole assembly is required.

Pairing is achieved with bearings of identical tolerance classes and by applying an axial preload to the inner rings for the O arrangement and on the outer rings for the X arrangement. Afterwards the inner or outer ring is grinded in order to get both side faces in the same plane with minimum clearance.

Paired bearings are packed two by two according to their arrangement (O or X). It is very important not to separate them while unpacking.

Packing unit : 50 pairs.

O arrangement (back-to-back)

 Before Preloading

After Preloading

 * Note: Pairing reference: mark on the outer ring,
 being at the same time the contact surface of the bearings.

The load lines diverge towards the bearing axis thus providing a greater abutment distance and consequently a great degree of stiffness of the whole assembly. The O arrangement accepts axial and radial loads acting in both directions.

X arrangement (face-to-face)

 Before Preloading

After Preloading

* Note: Pairing reference: mark on the outer ring,
on the opposite bearing side faces.

The load lines diverge towards the bearing axis thus providing a shorter abutment distance and a lower angular stiffness of the whole assembly. The X arrangement is less sensitive to misalignments and accepts axial and radial loads acting in both directions.

  DUPLEX Paired Bearings (Standard Bearings)

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