Slewing Ring

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 Slewing bearing or slew[ing] ring is a rotational rolling-element bearing  that typically supports a heavy but slow-turning or slow-oscillating load, often a horizontal platform such as a conventional crane ,a swing yarder,or the wind-facing platform of a horizontal-axis  windmill. (To "slew" means to turn without change of place.)

Compared to other rolling-element bearings, slewing bearings are thin in section and are often made in diameters of a metre or more; the slewing bearings on the Falkirk Wheel  are 4 metres diameter and fit over a 3.5 metre axle.

Slewing bearings often use two rows of rolling elements. They often use three race  elements, such as an inner ring and two outer ring "halves" that clamp together axially.

Slewing bearings are often made with gear teeth integral with the inner or outer race, used to drive the platform relative to the base.

As for other bearings that reciprocate, rather than rotating continuously, lubrication can be difficult. The  oil wedge built up in a continuously rotating bearing is disrupted by the stop start motion of slewing. Instead, a  hydrostatic bearing with pumped oil flow may be used.

Excavator Sumitomo Sh240-5 Slewing Bearing, Slewing Ring, Swing Circle

0.551 Inch | 14 Mill Precision Ball Beari
20MM Bore; 47MM Outs N/A

Excavator Kobelco Sk220LC Slewing Bearing, Slewing Ring, Swing Circle

Bearings 0.0
N/A 1.651

3Cr13 Turntable Bearing / Slewing Ring Bearing (013.20.1220)

N/A 0.0
Tapered Roller Beari 0 Inch | 0 Millimete

Excavator Carterpillar Cat225 Swing Circle, Slewing Ring, Slewing Bearing

0808250274949 0 Inch | 0 Millimete
Ball Bearing Yes

Single-Row Four Point Contact Slewing Ball Bearing with Internal Gear 9I-1b40-1086-0450

M06288 MOLINE BEARING
MOLINE BEARING Bearings

Excavator Hyundai R210LC-3 Swing Circle, Slewing Bearing, Slewing Ring

Precision Ball Beari 1 Rib Inner Ring and
Yes 1.024 Inch | 26 Mill

Excavator Caterpillar Cat320d Slewing Bearing/Ring/Circle

M06288 0.0
Mounted Units & DODGE

Excavator Carterpillar Cat345b Swing Circle, Slewing Bearing, Slewing Ring

Expansion N/A
Flanged 4

Excavator Volvo Ec210lrc Swing Circle, Slewing Bearing, Slewing Ring

B04120 0.0
0 INA

Excavator Doosan S140LC-V Slewing Ring, Swing Circle, Slewing Bearing

N/A 2.515
ASAHI BEARINGS 0.0

Swing Circle, Slewing Ring, Slewing Bearing for Excavator Liebherr 934

B04144 1016
FAG BEARING 0.0

Industrial Robot Speed Reducers Crossed Roller Bearing Rb30035

Polyamide 55 mm
31171532 Shaft
1/10