FRB Bearings Slewing bearing application fields

The slewing bearing has to be adopted when,in a machinery or in mechanical plant,a structural part must rotate opposed to another part,along a fixed axis,ensuring the axial and radial link between the two parts.The slewing bearing,with the maximum stiffness offered by its design,must bear and transmit the operative loads of the structure it is linked to,and also it must guarantee the required motion precision,the respect of operational parameters,and the required lifetime.

It is evident how the slewing bearing is a fundamental component and its choice must be done according to specific technical studies.FRB Bearings technical staff can assist your company in the choice of the suitable bearing.

Common application are:
excavators
concrete pumps
boomlift,manlift
crane truck
civil and harbour crane
compactors
wind turbines
radar
manipulators
filling carousels
rotary tables
demolitions shears
wrapping machines
forest machines



Excavators
In this type of application,according to the typology of load and environment conditions,the slew bearing must have high stiffness features,for counteracing fast load variations,good rotational features,for easy rotation of the superstructure,resistance to impact in raceways and gear,in order to preserve its lifetime.The correct choice of suitable FRB Bearings is an added value to the general quality of your project.

Reference series:
Single row crossed roller bearings
Single row 4 contact point ball bearing

Concrete pumps
The slew bearing in concrete pumps supports the boom elongation also allowing its rotation,and for this reason it is subject to a huge tilting moment.It must also have a compact structure in order to be mounted on road vehicles.A common choice is a double row ball bearings,8-contact points,otherwise if loads are much lower,it could be one-row ball bearing.

Reference series:
4 Contact point single row ball bearing
8-Point contact double row ball bearing

Filling carousels
In filling carousels,slew bearing dimensions could vary from small to large diameter,but common characteristics are high precision construction and high continuous rotational speed.

Reference series
Single row 4 contact point ball bearing
Single row 4 contact point ball bearing-flanged sereis

Compactors
In compactor rollers,due to low rotation speed of the roller and to the relevant stress condition in presence of vibrations,the use of a pair of slew bearings supporting the roller is an ideal solution.

Reference series
Single row 4 contact point ball bearing,untoothed

Boomlift,manlift
This is a typical application of the slewing bearing.The whole overhang load of the aerial platform is entirely supported by the bearing

Reference series
Single row 4 contact point ball bearing
Double row 8 contact point ball bearing

Rotating clamp
On the forklifts it is often necessary to have a lifting clamp to rotate the lifted object,with the possibility to pour its content or to allow is handing in the production and storage cycles.

Reference series
Single row 4 contact point ball bearing,external toothed

Welding positioners
A slew bearing is applied to the base of the arm of welding robots,in order to support the overhang structure and allow its rotational motion,moreover,high stiffness is required to ensure precision in positioning.

Reference series
Single row crossed roller bearing

Rotary tables
In machining centers,where a micrometric control is required,a YRT type bearing is installed on the turntable base.YRT is produced according to the highest precision requirements,completely grinded internally and externally,and assembled without any radial and axial clearance.The standard supply of this product also provides dimensional check certificates.

Reference series
YRT series Standard rotary table bearings
YRTS series Adding high speed,low frictional torque

Harbour & deck cranes
Harbour and check cranes represent one fo the most important application fields for slew bearings:their use is fundamental to support the structure subject to extreme load conditions,such as the handing of containers.The FRB Bearing technical center is able to design or to verify the selected slewing bearing in each part it is composed,and also to provide the compliance/material certificate usually required for this type of applications.

Reference series
Trip-row crossed roller bearing
Single row crossed roller bearing

Wind turbines
For this type of application the slew bearings are extremely important functional component and their design changes according to their position in the wind turbine.The first type is called Blade Bearing”B”,it is fixed in the base of each blade allowing its orientation.The second type is the Yaw Bearing”Y”,it is fixed on the base of the nacelle and it allows the orientation of the whole turbine.The third type is called Main Bearing”M” and it allows the motion transfer from the turbine to the generator.