Double-row Ball Slewing Ring Bearing
Double-row ball slewing ring with same diameter balls is usually
used for wind driven generators and concrete pump trucks. In wind
driven generator applications, double-row ball slewing ring is
often installed at the bottom of propellers for variable pitch
control which requires zero clearance, large start friction moment
and high running accuracy.
With compact construction, the double-row ball slewing ring bearing
decreases the diameter of mounting holes in the inner and outer
ring and increases the loading capacity.
Double-row ball slewing ring bearing usually comprises 3 rings,
steel balls and spacers can enter the upper and lower raceways
directly. Two sets of steel ball are placed based on the force
analysis. With such configuration, the 90° bearing angles of the
upper and lower arc raceway enable the bearing to take large axial
force and tilting moment. Special design is needed for the raceway
when the radial force is greater than one tenth axial force
Slewing Bearing Details
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
- Inner Ring
- Outer Ring
- Seal
- Spacer
- Ball/Roller
Advantages:
Double-row Angular Contact Ball Bearings can take axial load in
eighter direction and are the equivalent of arranging two Single-row Angular Contact
Bearings in a back-to-back configuration. These bearings are ideal
if axial space is limited, as they take up less space compared to
using two single row bearings
Application:
Double row contact ball slewing bearings are widely used for the
following applications:
Excavator
Crawler crane
Port machinery
Amusement facilities
