Three Row Cylindrical Roller Slewing Bearing

Overview of Three Row Cylindrical Roller Slewing Bearing 

A Three Row Cylindrical Roller Slewing Bearing is a type of bearing used in heavy machinery, particularly in cranes, excavators, and other large rotating equipment. The design of this bearing incorporates three rows of cylindrical rollers, which enhances its load-carrying capacity and provides better stability.

Features of Internal Gear Slewing Bearing

High Load Capacity:

The three-row design allows for the handling of a combination of axial, radial, and moment loads simultaneously. This significantly increases the load-bearing capacity compared to single-row slewing bearings.

Compact Structure:

Despite its high load-bearing capacity, the three-row cylindrical roller slewing bearing maintains a relatively compact structure, making it suitable for space-limited applications.

Optimized Load Distribution:

The three rows of rollers are arranged in a way that ensures a more even distribution of loads, which improves stability and helps in managing stress more efficiently.

Durability and Longevity:

The robust design of this bearing type allows it to withstand harsh operating conditions and heavy-duty applications, leading to an extended service life.

Superior Rotational Precision:

This bearing type ensures smooth and precise rotation, even under heavy loads, making it ideal for applications where high accuracy in movement is essential.

Self-aligning Capability:

The three-row design can accommodate some misalignment between the rotating and fixed components, offering greater tolerance for mechanical errors or deformations in the system.

Versatile Performance:

The bearing is capable of operating in both high-speed and low-speed environments, offering versatility in a variety of mechanical systems.

Enhanced Rigidity:

The multiple rows of cylindrical rollers provide excellent rigidity, which is important for applications requiring precise movement control and stability under varying loads.

Note:
1.n1 is the number of holes of lubricant, equally spaced, with oil cup M10×1 JB/T7940.1-JB/ T7940.2
2.The fastening holes n-dn1 and n-dn2 can be replaced by the tapped hole; the tooth width b can be changed to H-h
3.The tangential force of the internal gear is the maximum tangential force; the rating tangential force is the half of the maximum tangential force.

4.The addendum modification coefficient of internal teeth is 0.2

Techspecs of Three Row Cylindrical Roller Slewing Bearing:

Range of external diameter: 100 mm to 15000 mm

Ring material: 42CrMo / 50Mn/ C45

Ball/roller material: GCr15

Cage material: steel 20 or ZL102 cast aluminum alloy

Spacer material: nylon 6 / nylon 66

Quenching hardness of raceway: HRC55-62

Tooth type: no gear, internal gear, external gear

Applications of Three Row Cylindrical Roller Slewing Bearing 

Cranes:

Used in both mobile and tower cranes, where they facilitate the rotation of the crane's boom or jib under heavy lifting loads.

Excavators:

Found in excavators to support the rotation of the upper structure relative to the lower chassis, especially in heavy-duty excavators handling large, difficult workloads.

Offshore Oil Rigs:

Used in rotating equipment for offshore platforms where reliability under harsh weather conditions and heavy moment loads is critical.

Wind Turbines:

In wind turbines, these bearings are used to allow smooth rotation of the turbine blades and nacelle, offering high load-carrying capacity while withstanding significant stresses.

Mining Equipment:

Heavy mining machinery, such as rotary drilling rigs, utilizes these bearings to ensure reliable rotation of large, heavy components under extreme conditions.

Construction Machinery:

These bearings are found in construction equipment like pile drivers, concrete mixers, and other machinery that requires rotational movement of large parts under heavy load.

Railway Turntables:

Used in railway turntables to provide smooth rotation and high load support for rotating railway tracks or vehicles.

Aerial Work Platforms (AWP):

Used in the slewing mechanisms of aerial platforms or boom lifts to ensure smooth and stable rotation of the lift arms.

Military and Aerospace Applications:

In military vehicles and aerospace equipment, the ability to support high axial and radial loads makes the three-row cylindrical roller slewing bearing useful in turrets, radar systems, and other rotational mechanisms.

Robotic Arms:

In industrial robotics, particularly those used for heavy material handling, these bearings are used to provide smooth and precise movement in the arm joints under heavy load.