SKF Bearing

 

1. Deep Groove Ball Bearings

2. Angular Contact Ball Bearings

3. Self-aligning ball bearings

4. Taper Roller Bearings

5. Cylindrical Roller Bearings

6. Spherical Roller Bearings

7. CARB toroidal roller bearings

8. Spherical roller thrust bearings

9. Thrust ball bearings

10. Y-bearings

 

1. Deep Groove Ball Bearings

The SKF standard assortment includes:

  • Single row deep groove ball bearings (fig. 1)
  • most widely used
  • Stainless steel deep groove ball bearings (fig. 2)
  • corrosion resistant when exposed to moisture and several other media
  • Single row deep groove ball bearings with filling slots (fig. 3)
  • higher radial load carrying capacity
  • Double row deep groove ball bearings (fig. 4)
  • considerably higher load carrying capacity

 

 

 

2. Angular Contact Ball Bearings

Single row SKF super-precision angular contact ball bearings (fig. 1) are non-separable and, like all angular contact ball bearings, have raceways in the inner and outer rings that are displaced relative to each other in the direction of the bearing axis. This means that in addition to radial loads, these bearings can also accommodate axial loads in one direction. Radial loads induce axial forces in these bearings that need to be balanced by counterforces. An angular contact ball bearing is, therefore, always adjusted against a second bearing or used in sets.
The ring shoulders can have a different height on one or both bearing rings. Every bearing has the largest possible number of balls, which are guided by a window-type cage.

Bearing series
The SKF assortment of super-precision angular contact ball bearings includes bearings in the following dimension series:
ultra light 718 series
extremely light 719 series
light 70 series
robust 72 series
The cross sections of the four bearing series are compared in fig. 2 for the same bore and same outside diameters. Each bearing series has characteristic features that make it particularly suitable for certain bearing applications.

Where a low cross-sectional height is a critical design parameter, bearings in the 718 series should be selected. If more radial space is available, and loads are not very heavy, bearings in the 719 or 70 series could be used. Bearings in the 72 series have the largest cross-sectional height for a given bore diameter and are suitable for heavy loads at relatively low speeds.

If a high degree of stiffness is required, bearings in the 718 and 719 series are typically used. Bearings in these two series contain the largest number of balls, relative to the selected bore size, and can also accommodate the largest shaft diameter, relative to their outside diameter. Both characteristics are particularly important for system rigidity, as the rigidity of a spindle increases with its shaft diameter, and the rigidity of a bearing arrangement increases with the number of balls.

Contact angles
Super-precision angular contact ball bearings are manufactured with the following contact angles (fig. 3):
a 15° contact angle, designation suffix C
a 25° contact angle, designation suffix AC
For S70 W series bearings, the contact angle is 18° (designation suffix F). For other series, bearings with an 18° contact angle (designation suffix F), are available on request.

A larger contact angle provides a higher degree of axial stiffness and a higher axial load carrying capacity. However, speed capability, radial stiffness, and radial load carrying capacity are reduced.

 

3. Self-aligning ball bearings 

  • SKF standard assortment
  • SKF self-aligning ball bearing variants are:
  • open (fig. 1)
  • with cylindrical bore
  • with tapered bore, e.g. for use with adapter sleeves (fig. 2)
  • with extended inner ring (fig. 3)
  • sealed (fig. 4)
  • with cylindrical bore
  • with tapered bore, e.g. for use with adapter sleeves

 

 

 

4. Taper Roller Bearings 

 

SKF Explorer tapered roller bearings for your toughest challenges
In today’s industrial world, you need solutions that are able to handle the toughest challenges and ready to meet even greater demands. Solutions that work harder, work longer and work safer. Solutions robust enough to cope with challenging conditions and testing environments. Solutions that deliver longer and more consistent periods of uptime to ensure greater productivity and efficiency.

We understand what markets demand and the size of the challenges you face. Only through understanding these challenges can we come up with better, more effective solutions.
You need a tapered roller bearing that can handle high loads
A tapered roller bearing that is both durable and reliable
A tapered roller bearing that is not going to compromise your productivity and safety
A tapered roller bearing that can withstand challenging and extreme conditions

 

Bearing features

Low friction

The optimized roller end design and surface finish on the flange (fig. 2) promote lubricant film formation, resulting in lower friction. This also reduces frictional heat and flange wear. In addition, the bearings can better maintain preload and run at reduced noise levels.

Long service life

The crowned raceway profiles of basic design bearings and the logarithmic raceway profiles of SKF Explorer bearings optimize the load distribution along the contact surfaces, reduce stress peaks at the roller ends (fig. 3), and reduce the sensitivity to misalignment and shaft deflection compared with conventional straight raceway profiles (fig. 4).

Enhanced operational reliability

Optimized surface finish on the contact surfaces of the rollers and raceways supports the formation of a hydrodynamic lubricant film.

Consistency of roller profiles and sizes

The rollers incorporated in SKF tapered roller bearings are manufactured to such close dimensional and geometrical tolerances that they are practically identical. This provides optimal load distribution, reduces noise and vibration, and enables preload to be set more accurately.

Rigid bearing application

A single row tapered roller bearing is typically adjusted against a second tapered roller bearing. By applying a preload, a rigid bearing application can be achieved.

Running-in period with reduced temperature peaks

Tapered roller bearings typically have a running-in period, during which a conventional design tapered roller bearing experiences a significant amount of friction, resulting in wear. This effect is noticed as a temperature spike (diagram 1). With SKF tapered roller bearing designs, friction, frictional heat and wear are significantly reduced, provided the bearings are mounted and lubricated correctly.

Separable and interchangeable

Depending on the design, tapered roller bearings are separable and components of same-sized bearings are fully interchangeable. For example, single row tapered roller bearings are separable (fig. 5), i.e. the inner ring with roller and cage assembly (cone) can be mounted separately from the outer ring (cup). This facilitates mounting, dismounting and also maintenance inspection routines.

 

 

5. Cylindrical Roller Bearings

 

SKF cylindrical roller bearings are available in many designs, series and sizes. The major design differences between the bearings presented in this section are in:

 

  • the number of roller rows (one, two or four) 
  • the type of cage (with, without or special designs) 
  • Bearings with cage can accommodate heavy radial loads, rapid accelerations and high speeds. 
  • Full complement bearings (without cage) incorporate a maximum number of rollers and are therefore suitable for very heavy radial loads at moderate speeds. 
  • SKF high-capacity cylindrical roller bearings combine the high load carrying capacity of a full complement bearing with the high speed capability of a bearing with cage. 
  • the configuration of the inner and outer ring flanges (position and number of guide flanges)

 

 

Bearing features

High load carrying capacity

High stiffness

Accommodate axial displacement (fig. 1)

Except for bearings with flanges on both the inner and outer rings.

Low friction (Roller end / flange contact area)

The open flange design (fig. 2), together with the roller end design and surface finish, promote lubricant film formation resulting in lower friction and higher axial load carrying capacity.

Long service life

The logarithmic roller profile reduces edge stresses at the roller/raceway contact (fig. 3) and sensitivity to misalignment and shaft deflection.

Enhanced operational reliability

The surface finish on the contact surfaces of the rollers and raceways supports the formation of a hydrodynamic lubricant film.

Separable and interchangeable

The separable components of SKF cylindrical roller bearings are interchangeable (fig. 4). This facilitates mounting and dismounting, as well as maintenance inspections.

In addition to the bearings presented in this section, SKF supplies cylindrical roller bearings for special application requirements. This assortment includes:

 

 

 6. Spherical Roller Bearings

  

Spherical roller bearings have two rows of symmetrical rollers, a common sphered outer ring raceway and two inner ring raceways inclined at an angle to the bearing axis (fig. 1). The centre point of the sphere in the outer ring raceway is at the bearing axis.

 

 

Bearing features

Accommodate misalignment

Spherical roller bearings are self-aligning like self-aligning ball bearings or CARB bearings (fig. 2).

High load carrying capacity

Spherical roller bearings are designed to accommodate both heavy radial loads and axial loads in both directions.

Long service life

The rollers are manufactured to such tight dimensional and geometrical tolerances that they are practically identical in a roller set. The symmetrical rollers self-adjust (fig. 3), providing optimal load distribution along the roller length and together with the special profile prevent stress peaks at the roller ends (fig. 4).

Low friction

Self-guiding rollers keep friction and frictional heat at low levels (fig. 5). A floating guide ring guides unloaded rollers so that they enter the load zone in the optimal position.

Robust

All SKF spherical roller bearings contain strong window- or prong-type cages.

 

 

7.CARB toroidal roller bearings

 

CARB toroidal roller bearings have one row of long, slightly barrel-shaped symmetrical rollers and torus-shaped raceway profiles (fig. 1). They are non-locating bearings and accommodate exclusively radial loads. CARB bearings are often used to replace the non-locating spherical roller bearing in a locating/non-locating bearing arrangement.

 

Bearing features

Accommodate misalignment

CARB bearings are self-aligning like spherical roller bearings or self-aligning ball bearings (fig. 2).

Accommodate axial displacement

CARB bearings compensate for thermal expansion of the shaft like cylindrical or needle roller bearings (fig. 3).

Wide assortment of dimension series

CARB bearings are available with the same boundary dimensions as corresponding spherical roller bearings, self-aligning ball bearings, cylindrical roller bearings and needle roller bearings (fig. 4)

Long service life

The special roller profile prevents stress peaks at the roller ends (fig. 5).

Low friction

Self-guiding rollers keep friction and frictional heat at low levels (fig. 6).

Improved wear resistance

All CARB bearings are upgraded SKF Explorer bearings.

Low noise

CARB bearings can reduce noise and vibration levels, for example, in paper machines and fans.

 

 

8. Spherical roller thrust bearings

 

 

SKF spherical roller thrust bearings have specially designed raceways and asymmetrical rollers. The bearings can accommodate axial loads acting in one direction and simultaneously acting radial loads. The load is transmitted between the raceways via the rollers at an angle to the bearing axis, while the flange guides the rollers (fig. 1).

Bearing features

High load carrying capacity

The large number of rollers, which have an optimum conformity with the washer raceways, enables the bearings to accommodate heavy axial and simultaneously acting radial loads.

Accommodate misalignment

SKF spherical roller thrust bearings are self-aligning and can accommodate misalignment (fig. 2).

Separable design

SKF spherical roller thrust bearings are separable, making it possible to mount and dismount the housing washer separately from the shaft washer and roller and cage assembly. In addition this facilitates maintenance inspections.

High speed capability

The cage designs and the optimum conformity of the rollers with the washer raceways make the bearings suitable for relatively high speeds.

Long service life

The special roller profile reduces edge stresses at the roller/raceway contact.

Low friction

The optimized roller end / flange contact keeps frictional heat at low level, even at high speeds.

 

 

9. Thrust ball bearings

 

SKF thrust ball bearings are manufactured as single direction (fig. 1) or double direction (fig. 2) thrust ball bearings. They are designed to accommodate axial loads only and must not be subjected to any radial load.

 

Bearing features

Separable and interchangeable

The separable components of SKF thrust ball bearings are interchangeable (fig. 3, fig. 4). This facilitates mounting and dismounting, and maintenance inspections.

Initial misalignment

Bearings with sphered housing washer(s) (fig. 5) can accommodate initial misalignment.

Interference fit

Shaft washers have a ground bore to enable an interference fit. The bore of the housing washer is turned and always larger than the shaft washer bore.

 

10. Y-bearings

 

Insert bearings (SKF Y-bearings) are based on sealed deep groove ball bearings in the 62 and 63 series, but have a convex outer ring and in most cases an extended inner ring with a specific locking device, enabling quick and easy mounting onto the shaft.

 

Bearing features

Quick and easy to mount

The different locking methods enable quick and easy mounting of insert bearings onto the shaft.

Accommodate initial misalignment

The spherically shaped outside surface enables initial misalignment by tilting in the housing (fig. 1).

Long service life

The different sealing solutions available provide a long service life for a wide variety of applications with high contamination levels.

Reduced noise and vibration levels

Where high requirements on noise and vibration levels are important, SKF can provide the appropriate shaft locking method.

 

 

 

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