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Slewing bearings are critical components in many industrial and heavy-duty applications, enabling smooth rotational movement while supporting axial, radial, and tilting moment loads. These bearings are commonly used in cranes, excavators, wind turbines, and industrial robots.
The structure of a slewing bearing consists of inner and outer rings with rolling elements (balls or rollers) positioned between them. Some designs include gear teeth on the inner or outer ring to facilitate movement with a drive mechanism. There are various types of slewing bearings, including single-row ball, double-row ball, cross-roller, and three-row roller bearings, each designed for specific load and performance requirements.
A slewing bearing — also called a slewing ring, slew ring, slew bearing, or turntable bearing — is a large-diameter rotational bearing designed to simultaneously support axial loads, radial loads, and moment (tilting) loads.
Unlike standard bearings that handle primarily one load direction, a slewing bearing handles all three at once, which is what makes it indispensable in heavy rotating equipment.
Slewing bearings are manufactured in diameters ranging from 200 mm to over 6,000 mm, with some specialty applications pushing beyond 8 meters.
They typically feature two concentric rings (inner and outer), rolling elements between them, and — in many designs — integrated gear teeth on one ring for driven rotation.
The result is a single compact unit that replaces what would otherwise require multiple separate components: a bearing, a gear ring, and a support structure.
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