Self aligning ball bearings

Self aligning ball bearings are non-separable double-row bearings. Each set of balls rotate within a single outer ring spherical raceway.
In applications where the load-carrying capacity of radial insert ball bearings is insufficient, spherical roller bearings, which have the same misalignment-tolerant properties, can be used as a substitute.

There are various types of aligning ball bearings :
· self aligning ball bearings with tapered bore adapter sleeves;
· self aligning ball bearings with extended inner rings.



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Self-aligning ball bearings have one or two rows of balls that roll on a single track of spherical shape machined on the outer ring. This characteristic of theirs gives the bearing the swiveling capability that allows certain values of shaft misalignment relative to the housing.
Bearings with these properties are particularly suitable in all applications involving shaft deflection or misalignment.
The self-aligning ball bearing, of all rolling bearings, has the least friction, which allows the bearing to operate without heating up even at high speeds.

In addition, these bearings are ideal for low radial loads or medium to high radial combination and low axial loads.

Self-aligning ball bearings are available in cylindrical form or with tapered inner bores, with built-in contact seals, identified with the suffix 2RS and with suffix K-2RS.

Bearings with suffix 2RS have a limited speed rating because of the additional heat generated by rubbing the sealing lips. For this reason, the maximum speed should not exceed 2/3 of the recommended speed for grease-lubricated open bearings.

The standard material used for seals is a wear-resistant synthetic rubber (NBR).

Self aligning ball bearings are produced to normal tolerance class (PN) as standard.

Spherical ball bearings are produced with normal internal clearance, identified with suffix “CN,” however, several versions are also available with increased clearance, e.g., C3.

Many bearings can be supplied with minor clearance C2 or very high clearance C4.

Self aligning ball bearings require a certain minimum load to operate properly.

For ITS Italia the minimum load must be greater than 2% of the dynamic load coefficient.

Self-aligning ball bearings are equipped with different types of cages, depending on the series and size.

Small and medium sized self aligning ball bearings are fitted with polyamide cages or rather pressed steel cages as standard. Larger sizes are fitted with solid brass cages.

Self-aligning ball bearings are used in the following applications:

  • agricultural machinery;
  • chemical sector;
  • pumps.

When bearings with a tapered bore need to be fixed on a cylindrical shaft, tension or pressure sleeves are used, which facilitate assembly and disassembly.

Tension sleeves do not require axial anchoring devices on the shaft.

The sleeves are cut and come complete with locking rings and safety devices.

The tension sleeves are equipped with a special safety washer that has a protrusion on the side facing the bearing and is used to prevent possible damage to the seal.

Another design of self aligning ball bearings is self aligning with extended inner rings bearing.

These bearings are used in applications with low requirements, where there are provided shafts obtained by wire drawing. Special bore tolerances ensure easy assembly and disassemble.

Bearings are fixed axially on the shaft with a pin or a screw inserted in the hollow provided on an inner side of the ring and which also prevents the rotation on the shaft. When a shaft is mounted on two of these bearings, hollows obtained in the inner rings must be subjected opposite one another or in the opposite position.

Otherwise, the shaft must be axially constrained in one direction only.

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