Designs of slewing bearings

Tapered roller 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 diameter	800 - 9,500 mm
Average tapered roller diameter	40 - 110 mm
Gearing	with external gears / with internal gears / without gearing special gearing upon request
Gear module	8 - 50 mm

Liebherr-slewing-bearings-tapered-roller-bearings-no-gearing-1920x1300

Tapered roller 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.

Single-row tapered roller bearing

The single row tapered roller bearings are mainly used for the main bearing arrangement in wind turbines. Optimum rolling characteristics and ideal force distribution are ensured by the layout and design of the tapered roller bearing.

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Roller bearing slewing rings

Liebherr 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 Liebherr roller bearing slewing rings.

Roller bearings from the standard programme

Technical information

External diameter	800 - 9,500 mm
Rolling element diameter	12 - 140 mm
Gearing	with external gears / with internal gears / without gearing special gearing upon request
Gear module	8 - 50 mm

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 for tunnel boring machines

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.

Liebherr-slewing-bearings-triple-row-roller-bearings-special-seals-1920x1300

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.

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.

Roller bearings with bolt connection

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

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.

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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 Liebherr ball bearing slewing rings.

Ball bearings from the standard programme

Technical information

External diameter	800 - 9,500 mm
Average tapered roller diameter	20 - 90 mm
Gearing	with external gears / with internal gears / without gearing special gearing upon request
Gear module	8 - 50 mm

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.

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

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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 Liebherr combined roller and ball bearings.

Combined roller and ball bearings from the standard programme

Technical information

External diameter	800 - 9,500 mm
Average tapered roller diameter	16 - 100mm
Gearing	with external gears / with internal gears / without gearing special gearing upon request
Gear module	8 - 50 mm

Liebherr-slewing-bearings-combined-roller-and-ball-bearings-1920x1300

Combined roller and ball bearing slewing rings

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.

Gear rings

Liebherr 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 diameter	800 - 9,500 mm
Gearing	with external gears / with internal gears / without gearing special gearing upon request
Gear module	8 - 50 mm
Weight	25 - 25,000 kg

Gear rings

Liebherr 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.

Types of slewing bearings

Tapered roller bearings