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Slewing ring bearings

Slewing ring bearings

slewing ring bearing is a special bearing that can bear particularly large axial load and overturning moment. Mainly ball sliding bearings, roller sliding bearings, ball roller combined sliding ring bearing. At the same time, the rotary table bearing is also divided into internal teeth, external teeth and toothless.  
Size range: 100 - 12000 mm 
Applications: Construction machinery, Port hoisting machinery, Ladle turret,  TBM, Forestry equipment and Military industry

Slewing rings are generally large size ball or roller bearings with very high load carrying capacity for oscillating motions and slow rotary motions.

The bearings are mainly mounted in a horizontal position and are used to support axial forces and large tilting moments. Radial loads only occur to a subordinate extent. The bearing rings are generally screw mounted directly to the immediate parts of the adjacent construction.

The inner or outer ring can be provided with teeth to facilitate drive solutions.

Slewing rings are normally subjected to load while undergoing rotary motion only infrequently, slow swivel motion, slow rotation or while stationary and are mainly dimensioned on the basis of their static load carrying capacity.

The bearings are used for supports in excavators (in this case as a connecting element between the upper and lower structure), in cranes (for example as azimuth swivel bearings), in wind power for blade and tower adjustment and in many other areas of heavy machine building. They are used in applications where high loads are present and there is a requirement for pronounced operational security.

Small slewing rings with high precision are also used in robots and robot drives.

Ball bearing slewing rings

Ball bearings are particularly suitable for applications exerting low to medium loads on the bearings. Usually, polymer spacers are installed between the rolling elements, although bearing designs with steel or brass cages are also available.

Standard series

In addition to customised projects, our portfolio contains a comprehensive standard programme of one-piece FV ball bearing slewing rings.

Technical information

External diameter800 - 7,500 mm
Rolling element diameter20 - 90 mm
Gearingwith external gears / with internal gears / without gearing 
special gearing upon request
Gear module8 - 50 mm

Types of ball bearing slewing rings

single-row-four-point-slewing-bearing

large-diameter-bearings-single-row-four-point-bearing-special-seals-inner-gearing

Single-row four-point bearings

Single-row four-point bearings are used, for example, for the slewing of excavators, the boom movement of tower cranes and as drive elements for large rope winches.

Single-row four-point bearings with special seals

Special forms of seals are always used whenever bearings are exposed to particularly harsh environmental conditions, and protect the slewing bearing, for example, from seawater penetration.

large-diameter-bearings-two-row-four-point-bearing-outer-gearing

large-diameter-bearings-two-row-ball-bearing-no-gearing

Double-row four-point bearings

Double-row four-point bearings can support significantly higher loads than single-row four-point bearings, for an equivalent diameter. They are used in applications with high loads and restricted installation space, such as for rotor blade adjustments on wind turbines.

Double-row ball bearings (double, axial ball bearings, double thrust bearings)

Double-row ball bearing slewing rings are distinguished by their high cost-effectiveness and their robust design. They are used, for example, in crane technology.
 

Roller bearing slewing rings

FV roller bearings are suitable for medium to high loads. They are designed as standard in triple-row configurations with two axial and one radial roller raceway. Depending on the case of use, other designs and variants are however also available.

Standard series

In addition to customised projects, our portfolio contains a comprehensive standard programme of one-piece FV roller bearing slewing rings.

Technical information

External diameter800 - 7,500 mm
Rolling element diameter12 - 140 mm
Gearingwith external gears / with internal gears / without gearing 
special gearing upon request
Gear module8 - 50 mm

Types of roller bearing slewing rings

Cross roller bearings

On account of their play-free mounting, cross roller bearings offer greater precision than traditional roller bearings. They are used above all in tunnel boring machines and in conveyor technology.

Triple-row roller bearings

In heavy machines, such as mining excavators, roller bearing slewing rings tend to be used mainly on account of the high loads.

Triple-row roller bearings with special seals

Triple-row roller bearing slewing rings can be fitted according to need with specially-developed seal systems. These can protect the bearing in thrusters, for example, against the penetration of seawater while at the same time preventing the leakage of lubricants.

Triple-row roller bearings for TBM

Roller bearing slewing rings for tunnel boring machines are fitted with a preloaded retaining raceway. The cup springs for preloading the raceway ensure that the rolling elements never lose contact with the raceway, thereby guaranteeing optimised wear characteristics.

Roller bearings with bayonet joint

Bearing designs with bayonet joints are used in the presence of a special adjacent construction. This is often the case with cranes

Roller bearings with bolt connection

Bearing designs with bolt connections are used in the presence of a special adjacent construction. This is often the case with cranes

Combined roller and ball bearing slewing rings

Combined roller and ball bearings are designed as standard with a roller raceway (supporting raceway) and a ball raceway (retaining raceway). This makes this type of design particularly suitable for high axial loads and harsh environmental conditions.

Standard series

In addition to customised projects, our portfolio contains a comprehensive standard programme of one-piece FV combined roller and ball bearings.

Technical information

External diameter800 - 8,500 mm
Rolling element diameter16 - 100 mm
Gearingwith external gears / with internal gears / without gearing 
special gearing upon request
Gear module8 - 50 mm
Combined roller and ball bearing slewing ring bearings

Combined roller and ball bearing slewing ring bearings

The combination of roller and ball bearing offers a cost-effective alternative to traditional roller bearing slewing rings. This bearing type is mainly designed for axial loads, and is frequently used in conveyor technology, for example with bucket excavators.

Tapered roller slewing bearings

Tapered roller bearings can be subjected to radial and axial loads. They are suited to high load conditions. The tapered form of the rolling elements ensures optimum rolling characteristics. The play-free bearing mounting makes the tapered roller bearing particularly suitable for the highest precision and accuracy requirements.

Technical information

External diameter800 - 7500 mm
Average tapered roller diameter40 - 110 mm
Gearingwith external gears / with internal gears / without gearing 
special gearing upon request
Gear module8 - 50 mm
Tapered roller slewing bearings

Tapered roller slewing bearings with no gearing

Optimum rolling characteristics and ideal power distribution are guaranteed by the layout and design of the tapered rollers. This design is used, for example, as the main bearing in wind turbines or in tunnel boring machines.

Gear rings

FV also manufactures gear rings, used for example in rope winch drives or for the yaw adjustment of wind turbines. The gear rings can also be configured in segments according to customer requirements.

Technical information

External diameter800 - 8500 mm
Gearingwith external gears / with internal gears 
special gearing upon request
Gear module8 - 50 mm
Weight25 - 30000 kg

Gear rings

FV has developed its own gear cutting machines for the milling of the gear rings. These ensure the best possible gearing results and guarantee optimum precision.

SLEWING RING BEARING CATALOG.PDF


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