Self-aligning ball bearings

Product Description

Self-aligning ball bearings have two rows of balls, a common sphered raceway in the outer ring and two deep uninterrupted raceway grooves in the inner ring. They are available open or sealed. The bearings are insensitive to angular misalignment of the shaft relative to the housing (fig. 1), which can be caused, for example, by shaft deflection.

Bearing Features

Features

●  Self-aligning up to a maximum of 3 degrees depending on series and design

●  Virtually no risk of sliding during start-ups and light load conditions

●  Extremely low friction offers minimum operating temperature combined with high speed capability

●  Sealed versions provide robust protection in harsh environments

●  E design bearings with optimized internal geometry offer maximum load capacity 

Benefits

●  Long and reliable bearing service life

●  Lower maintenance and operating costs

●  Increased uptime and productivity

●  Increased energy efficiency

●  Reduced vibration and noise

●  Lower operating temperatures

●  Managing misalignment

The chart shows the maximum misalignment that can typically be accommodated by various open bearing types. Optimally sized NEWORLD open self-aligning ball bearings can compensate for up to 3 degrees of misalignment, depending on the series. NEWORLD sealed self-aligning ball bearings can accommodate up to 1,5 degrees of misalignment.

Bearing Designs

To help maximize service life and minimize maintenance in different applications, NEWORLD self-aligning ball bearings are available in several designs: 

●    Open design (fig. 1) 

      The standard option for external lubrication with oil or grease.

       ◌ with a cylindrical bore

       ◌ with a tapered bore, e.g. for use with adapter sleeves (fig. 2)

       ◌ with an extended inner ring (fig. 3)

●    Sealed design (fig. 4)

      Protected on both sides by rubber seals, this design is intended to retain lubricant 

      and exclude contamination for longer grease life and reliable operation in harsh environments.

       ◌ with a cylindrical bore

       ◌ with a tapered bore, e.g. for use with adapter sleeves

●   Tapered bore design

      Widely used in ring frame main shaft applications, tapered bore bearings are normally mounted 

      to cylindrical shafts with adapter sleeves and can be easily repositioned on the shaft. 

●   E design

     Able to incorporate more and/or larger balls, this optimized internal design delivers a 

    30% greater basic dynamic load rating than standard executions, enabling longer service 

     life or bearing downsizing. 

Details of Bearings

Sealed bearing

Sealed bearings equipped with contact seals on both sides (fig. 5) are available:

●  in the 22 and 23 series

●  with bore diameter 10 ≤ d ≤ 70 mm

●  with seals made of sheet steel reinforced NBR (oil and wear-resistant, designation suffix 2RS1)

Permissible angular misalignment of sealed bearings is slightly reduced compared to open design bearings. 

Large self-aligning ball bearing 

●  are available in the 130 and 139 series

●  are equipped with an annular groove in the outer ring and (fig. 6):

othree equally-spaced lubrication holes in the outer ring

osix equally-spaced lubrication holes in the inner ring

●  can be used in any application where low friction is preferred over high load carrying capacity (e.g. in the paper industry)

Bearings with an extended inner ring

● fig. 7

● are designed for less demanding applications that use commercial grade shafting

● have a special bore tolerance, class JS7 (table 3), that facilitates mounting and dismounting

● are located axially on the shaft by means of a slot at one end of the inner ring that engages a pin or shoulder screw (fig. 8) fitted to the shaft

This also prevents the shaft from spinning in the bearing bore.

E design self-aligning ball bearing

E type self-aligning ball bearing type – sealed or open versions - to deliver a long, reliable service life with E design bearings for maximum load capacity.

Depending on the size of bearing required, NEWORLD self-aligning ball bearings are available with an optimized internal design that carries the designation suffix “E”. These bearings incorporate more and/or larger balls and have a basic dynamic load rating up to 30% higher than standard bearings.

Cages

Depending on their series and size, NEWORLD self-aligning ball bearings are fitted with one of the cages shown in table 4.

When used at high temperatures, some lubricants can have a detrimental effect on polyamide cages. For additional information about the suitability of cages, contact NEWORLD.

Application

Applications

●  Conveyors

●  Separators

●  Mixers 

●  Snub pulleys

●  Take-up pulleys

●  Bend pulleys

●  Tail pulleys 

●  Spinning machines

●  Fabric processing machines