Slewing Rings
SLEWING RINGS
QCB have years of experience, backed by state of the art design software to ensure the optimum solution for your needs. We have become a trusted name in slewing ring bearings with a satisfied and international customer base in industries as diverse as mining machinery, materials handling, offshore oil and gas, access platforms, process treatment plants, wind power, special effects and art installations.
Slewing bearings
Slewing rings are large diameter rolling bearings that can accommodate axial, radial and moment loads in combination, while rotating or making oscillatory motions. Slewing rings consist of 2 or 3 rings between which either spherical or cylindrical rolling elements are arranged with suitable spacers or cage. The rings incorporate mounting and handling holes, as well as integral spur, helical or worm gearing. Lip seals prevent the ingress of contaminants into the raceway.
As well as our own designs, we offer equivalents to other brands such as Torriani Gianni, La Leonessa, BRB Technologies, INA-FAG (now the Schaeffler Group), Roballo, Roth Erde, Rollix Defontaine, Avon, Taperex, Kaydon, Rossi-MRI, RKS, SKF, RIMA, IMO, Titanus, Silverthin, PSL, Drecon to name a few…
QCB has experience in the manufacture of
Single row ball bearings
Double row ball bearings
Crossed roller bearings
Combination ball / roller bearings
Triple row roller bearings
Wire race bearings
Precision rotary turntables
Harmonic reducer bearings
Ring gears
Segmented bearings and ring gears
Pinions
Pinion shafts
Not only do we have an extensive catalogue reference library, and have developed an extensive interchange system.
Slewing Drives
Essentially a slewing drive is a slewing ring mounted on a base plate onto which a worm shaft is fixed which engages on the helical or worm gear in the outer ring. Hydraulic or electric motors can be used to provide rotation.
During 2021 we will be introducing a new spur-gear based slewing drive range.
Geared motors and pinions
Geared rings require some form of drive. Working in conjunction with leading manufacturers QCB offers turnkey solutions with matched pinions, electric or hydraulic geared motors (helical-bevel, worm or planetary style), servo-motors
.
Trailer rings
Low precision, large diameter bearings intended primarily for low speed articulation of off-road trailer steering axles, and light industrial applications with
intermittent movement. Trailer rings are usually manufactured in a low grade
carbon steel and are undrilled and unsealed. As such trailer rings are not
suited to applications with eccentric loads or continuous rotation.
Most QCB slewing rings use standardised nitrile or VITON lip seals to prevent
the ingress of contaminants, other sealing systems are available.
Spur, helical or worm gear profiles provide for the transfer of power if suitable
gearing is included in their design.
Slewing rings
Large diameter precision ball and/or roller bearings that can accomodate high
axial, radial and moment loads in combination while rotating or making oscillatory movements in any orientation.
Slewing rings consist of 2 or 3 rolled or forged rings between which either ball
or cylindrical rolling elements are arranged, usually separated by spacers or a
cage.
The rings incorporate drilled or tapped holes to facilitate fixation and handling.
Gearing on either (or both) rings facilitates the transmission of power.
This catalogue illustrates the standard range, much of which is stocked at all
times.
Many other QCB bearings are manufactured to special designs or derived
from samples or drawings submitted by our international clients.
Ring gears, gear segments and pinions
QCB can supply large diameter ring gears, gear segments and large pinions to order.
Worm gear slewing drives
Slewing drives consist of an externally geared slewing ring with associate worm shaft mounted on a common base plate in an open or enclosed style housing. Power is provided by hydraulic or electric geared motors. Load speed is usually restricted to around 2.5 rpm.
Spur gear slewing drives
Spur gear slewing drives offer higher rotation speeds over their worm gear counterparts of up to 20 rpm.
TRAILER RINGS
Series U,L&N – Light duty trailer rings
Trailer ring technical
Trailer rings do not usually have hardened raceways and cannot be considered as a replacement for a slewing rings.
Trailer rings are not precision bearings and dimensions such as the overall height can vary by as much as 3mm, and diameters by as much as 5mm.
Series U
Suitable for light offroad trailers, irrigation systems or airport luggage trolleys at speeds < 25 km/h and simple industrial turntables
Series L
Suitable for light trailers at speeds < 30 km/h
Series N
Suitable for heavier farm vehicles, factory trailers and small road going trailers at speeds > 30 km/h.
Support structure
Trailer rings should be supported by a stiff frame over at least 50% of their surface area with the loading plug positioned away from the direction of any significant radial load, usually at 90 deg to the direction of travel. Metal tags welded to the frame can be used to improve radial location and reduce bolt shear stress caused by acceleration and deceleration.
Bolt data
Series U, L and N are supplied undrilled. 6 to 8 Grade 8.8 bolts size M12 to M16 (depending on diameter) should be added to each flange. Typical bolt patterns are illustrated in Figure 1. Bolt torques should be tightened appropriately and checked during a monthly maintenance cycle. Recommended bolt torques are tabulated in Table 1
Bolt size Recommended torque (Nm)
M12 78
M14 126
M16 193
Table 1: Recommended trailer ring bolt torques
Lubrication
Unsealed trailer rings must be fully greased on installation and throughout their service life. A good quality multipurpose EP2 grease will be adequate in most applications. Grease intervals are difficult to define and will depend on operating conditions. In dirty or wet environments continuous lubrication is preferable. Always rotate the ring during lubrication to distribute the grease throughout the raceway.
Please browse the detailed product information through the brochure below: