Internal-toothed slewing bearing WD-07 series
balldouble-row

internal-toothed slewing bearing
internal-toothed slewing bearing
internal-toothed slewing bearing
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Characteristics

Teeth
internal-toothed
Rolling element
ball
Geometry
double-row
Inner diameter

Min.: 786 mm
(30.9 in)

Max.: 1,418 mm
(55.8 in)

Outer diameter

Min.: 1,010 mm
(39.764 in)

Max.: 1,713 mm
(67.441 in)

Width

Min.: 98 mm
(3.858 in)

Max.: 120 mm
(4.724 in)

Description

A slewing bearing or slew[ing] ring is a rotational rolling-element bearing or plain 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 resemble oversize aircraft control surface bearings. 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.

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