(WD-071) External Gear Double Row Ball trailer system Slewing Bearing 

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.

Double row ball slewing bearing, slewing ring has three seat rings, the steel ball and spacers can be directly arranged into the upper and lower race, and the steel ball has two different size.

Double row different ball slewing bearing , slewing ring’s axial and radial loads are relatively large, it is specially suitable for the medium diameter tower cranes, truck mounted cranes etc

Tytle:WD-071

Wight/KG:80-240

Strengths:The Oil nipple's location can be change according to the user's application.

Application:

1. food machinaery,

2.canning machinery  

3.environmental machinery etc.

Model Pdf.format	Dimensions ( mm)							Mounting dimension (mm)
	Da	O	U	Di	Ha	Hb	H	La	na	da	Li	ni	di
WD-071.22.372.pdf	504	466	374	278	75	87	95	430	16	18	314	16	18
WD-071.22.476.pdf	608	570	478	382	75	87	95	534	24	18	418	24	18
WD-071.22.580	712	674	582	486	76	88	98	638	24	18	522	24	18
WD-071.22.948.pdf	1080	1042	950	854	76	88	98	1006	30	18	890	30	18
WD-071.22.1064.pdf	1200	1162	1066	966	78	88	98	1124	36	20	1004	36	20