Single-row Angular contact ball bearings

Product Description

Angular contact ball bearings have inner and outer ring raceways that are displaced relative to each other in the direction of the bearing axis. This means that these bearings are designed to accommodate combined loads, i.e. simultaneously acting radial and axial loads.

The axial load carrying capacity of angular contact ball bearings increases as the contact angle increases. The contact angle is defined as the angle between the line joining the points of contact of the ball and the raceways in the radial plane, along which the combined load is transmitted from one raceway to another, and a line perpendicular to the bearing axis (fig. 1).

Features and benefits

●  High load carrying capacity

    The lower shoulder enables a large number of balls to be incorporated in the bearing, giving it a 

    relatively high load carrying capacity.

●  Good running properties

    Rapid accelerations and decelerations are possible.

●  Easy mounting of universally matchable bearings

    No adjustment is needed for correct internal clearance or preload.

Bearing design

Single row angular contact ball bearings

NEWORLD single row angular contact ball bearings can accommodate axial loads in one direction only. This type of bearing is typically adjusted against a second bearing. Their bearing rings have an upper and a lower shoulder and are non-separable.

Designs and variants

The NEWORLD standard assortment of single row angular contact ball bearings (fig. 1) includes:

  ●  bearings in the 72 B(E) and 73 B(E) series with 40° contact angle

  ●  some sizes in the 70 B series

  ●  sealed bearings:

      ◌   in series 72 B(E) (15 ≤ d ≤ 55 mm)

      ◌   in series 73 B(E) (12 ≤ d ≤ 50 mm)

  ●  bearings in the 72 AC series with 25° contact angle (15 ≤ d ≤ 70 mm)

  ●  bearings in the 73 AC series with 25° contact angle (17 ≤ d ≤ 70 mm)

  ●  some large size bearings with a flanged outer ring

  ●  inch bearings (ALS and AMS series)

Cages

NEWORLD single row angular contact ball bearings are fitted with one of the cages shown in table 3. The machined brass cage (designation suffix M) has been upgraded as follows:

  ●  optimized cage pocket geometry

  ●  a smaller cross section and reduced mass

  ●  increased material strength with reduced lead content

When used at high temperatures, some lubricants can have a detrimental effect on polyamide cages. 

Temperature limits

The permissible operating temperature for angular contact ball bearings can be limited by:

  ●  the dimensional stability of the bearing rings and balls

  ●  the cage

  ●  the seals

  ●  the lubricant

Where temperatures outside the permissible range are expected, contact NEWORLD.

Bearing rings and balls

The bearings are heat stabilized up to at least 150 °C (300 °F).

Cages

Steel, brass or PEEK cages can be used at the same operating temperatures as the bearing rings and balls. For temperature limits of cages made of other polymer materials, refer to Polymer cages.

Seals

The permissible operating temperature for NBR seals is –40 to +100 °C (–40 to +210 °F). Temperatures up to 120 °C (250 °F) can be tolerated for brief periods. Typically, temperature peaks are at the seal lip.

Paired bearings

Bearings for universal matching

  ●  are available with 25° and 40° contact angles

  ●  are intended to be used in sets

  ●  have ring widths and standouts manufactured to tight tolerances

  ●  can also be used in place of basic design bearings for arrangements with single bearings, as they 

      typically have higher precision, and increased load carrying capacity and speed capability

When two bearings are mounted immediately adjacent to each other, a given internal clearance or preload or an even load distribution between the two bearings is obtained without the use of shims or similar devices.

Bearings for universal matching are identified by the following suffixes:

  ●  CA, CB, CC or G for internal clearance

  ●  GA, GB or GC for preload

When ordering, indicate the number of individual bearings required and not the number of sets.

Paired mounting

Tandem arrangement (fig. 2)

  ●  is used where the load carrying capacity of a single bearing is inadequate

  ●  shares the radial and axial loads equally

  ●  has parallel load lines

  ●  can accommodate axial loads in one direction only

If axial loads act in both directions, a third bearing, adjusted against the tandem pair, must be added.

Back-to-back arrangement (fig. 3)

  ●  provides a relatively stiff bearing arrangement

  ●  can accommodate tilting moments

  ●  has load lines that diverge from the bearing axis

  ●  can accommodate axial loads in both directions, but only by one bearing in each direction

Face-to-face arrangement (fig. 4)

  ●  is less sensitive to misalignment but not as stiff as a back-to-back arrangement

  ●  has load lines that converge towards the bearing axis

  ●  can accommodate axial loads in both directions, but only by one bearing in each direction

Bearings with 25° contact angle (AC series)

  ●  have a raceway geometry optimized for high speeds

  ●  have reduced sensitivity to axial loading and misalignment, including the ability to accommodate two 

      times higher peak loads before edge stresses can occur

  ●  are equipped with an optimized machined brass cage as standard

Compared with bearings with 40° contact angle, benefits include:

  ●  20% higher limiting speeds

  ●  higher radial load carrying capacity (by trading off lower axial load carrying capacity)

  ●  increased robustness when used as the backup bearing in sets that are predominantly loaded in one 

      direction

Sealed bearings

Sealed bearings

NEWORLD supplies single row angular contact ball bearings in the 72 B(E) and 73 B(E) series, which are sealed on both sides.

Non-contact seals

  ●  are identified by the designation suffix 2RZ (fig. 1& 5)

  ●  have no additional frictional moment

  ●  have the same limiting speeds as open bearings

  ●  form an extremely narrow gap with the inner ring shoulder

  ●  are made of sheet steel reinforced NBR (oil and wear-resistant)

  ●  make good, positive contact with the recess in which they are fitted

Sealed single row angular contact ball bearings have an attractive combination of design features such as low friction seals and the same load carrying capacity as open variants – features that enable new design solutions for many demanding applications.

Reduced need for maintenance

Sealed single row angular contact ball bearings are ready-to-use units that are filled at the factory with the proper amount of high quality grease, under clean conditions.

The cleanliness in a bearing is essential for long service life. Protection is particularly important during installation. By using sealed single row angular contact ball bearings instead of open bearings, solid contaminants are less likely to enter the bearing.

Less frictional heat extends grease life

Non-contact seals, which are standard on all sealed single row angular contact ball bearings, generate less friction and frictional heat than contact seals or external lip seals. Lower operating temperatures influence grease life positive.

Reduced cost of ownership 

Sealed single row angular contact ball bearings are well suited for bearing arrangements where, due to limited space or for cost reasons, external seals are not practical. Their favourable design characteristics save space axially, enabling more compact machine designs. Environmentally friendly 

When compared to open bearings, sealed SKF single row angular contact ball bearings can significantly reduce grease consumption. These bearings do not have a relubrication feature, so all costs associated with relubrication including the costs to purchase and dispose of used grease are eliminated. More importantly, these bearings can reduce the environmental impact that a machine will have over course of its life cycle.

Features of sealed single row angular contact ball bearings 

Sealed single row angular contact ball bearings are manufactured the same way as open bearings, to provide the same quality and service life you have come to expect from NEWORLD. What makes Sealed NEWORLD single row angular contact ball bearings stand above the competition is NEWORLD's unique seal design. 

Sealed single row angular contact ball bearings are fitted with two non-contact seals as standard. These seals are made of NBR and reinforced with a sheet steel insert for higher mechanical stability. There is an extremely narrow gap between the seal lip and its counterface on the inner ring, but due to the special seal lip design, grease ejection is minimized. 

Another advantage of this seal design is that there is no friction between the seal and its counterface on the inner ring. This reduces frictional heat ( diagram 1), which extends the service life of the lubricant and does not affect the speed at which these bearings can operate.

The design of the seal lip makes these bearings suitable for vertical shaft applications ( diagram 2). The mass of ejected grease is lower at sealed single row angular contact ball bearings with a non-contact seal. 

In case of severe contamination or sealing against liquids is required, a low friction contacting seal solution can be proposed. Please contact NWEORLD.

Temperature range for RZ seals 

The permissible operating temperature range for RZ seals is –40 to +100 °C (–40 to +212 °F). Temperatures up to 120 °C (248 °F) can be tolerated for brief periods.

Application

Here are examples of applications in which single row angular contact ball bearings might be used:

·  ●  Fluid machinery:

       - Pumps

       - Scroll compressors

·  ●  Material Handling:

       - Elevators

·  ●  Electric motors

·  ●  Gearboxes