Slewing bearing

A slewing bearing or slewing 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 has three seat ring, the steel ball and the spacing block can be directly arrange into the upper and lower races, two rows of upper and lower steel balls with differently diameter are fitted according to the stress condition.

This kind of open assemly is very convenient, for the upper and lower bear raceway arc angles is 90, which can bear large axial forces and tilting moment. When the radial force is greater than 0.1 times the axial force need to be specially designed the raceway.

Double row different ball slewing bearing's axial and radial size are  relatively large and solid in structure, so it is specially fpr the medium diameter tower cranes,truck mounted cranes etc.loading and unloading machinery

Wight/KG:100-4700

To get drawing (pdf),please clik on Model.

No	Model Pdf.format	Dimensions			Mounting Dimension				Structural Dimension			Gear Data					Gear circumferential force		Weight  kg
		D mm	d mm	H mm	D1 mm	D2  mm	n	mm	n1 mm	H1 mm	h mm	b mm	x	m mm	D e mm	z	Normalizing Z 104N	Quenching T 104N
1	021.25.500.pdf	616	384	106	580	420	20	18	4	96	26	60	0.5	5	644	126	3.7	5.2	100
	022.25.500													6	646.8	105	4.5	6.2
2	021.25.560.pdf	676	444	106	640	480	20	18	4	96	26	60	0.5	5	704	138	3.7	5.2	115
	022.25.560													6	706.8	115	4.5	6.2
3	021.25.630.pdf	746	514	106	710	550	24	18	4	96	26	60	0.5	6	790.8	129	4.5	6.2	130
	022.25.630													8	790.4	96	6	8.3
4	021.25.710.pdf	826	594	106	790	630	24	18	4	96	26	60	0.5	6	862.8	141	4.5	6.2	140
	022.25.710													8	862.4	105	6	8.3
5	021.30.800.pdf	942	658	124	898	702	30	22	6	114	29	80	0.5	8	982.4	120	8	11.1	200
	022.30.800													10	988	96	10	14
6	021.30.900.pdf	1042	758	124	998	802	30	22	6	114	29	80	0.5	8	1086.4	133	8	11.1	250
	022.30.900													10	1088	106	10	14
7	021.30.1000.pdf	1142	858	124	1098	902	36	22	6	114	29	80	0.5	10	1198	117	10	14	300
	022.30.1000													12	1197.6	97	12	16.7
8	021.30.1120.pdf	1262	978	124	1218	1022	36	22	6	114	29	80	0.5	10	1318	129	10	14	340
	022.30.1120													12	1317.6	107	12	16.7
9	021.40.1250.pdf	1426	1074	160	1374	1126	40	26	5	150	39	90	0.5	12	1497.6	122	13.5	18.8	580
	022.40.1250													14	1495.2	104	15.8	21.9
10	021.40.1400.pdf	1576	1224	160	1524	1272	40	26	5	150	39	90	0.5	12	1641.6	134	13.5	18.8	650
	022.40.1400													14	1649.2	115	15.8	21.9
11	021.40.1600.pdf	1776	1424	160	1724	1476	45	26	5	150	39	90	0.5	14	1845.2	129	15.8	21.9	750
	022.40.1600													16	1852.8	113	18.1	25
12	021.40.1800.pdf	1976	1624	160	1924	1676	45	26	5	150	39	90	0.5	14	2055.2	144	15.8	21.9	820
	022.40.1800													16	2060.8	126	18.1	25
13	021.50.2000	2215	1785	190	2149	1851	48	33	8	178	47	120	0.5	16	2300.8	141	24.1	33.3	1150
	022.50.2000													18	2300.4	125	27.1	37.5
14	021.50.2240	2455	2025	190	2389	2091	48	33	8	178	47	120	0.5	16	2540.8	156	24.1	33.3	1500
	022.50.2240													18	2552.4	139	27.1	37.5
15	021.50.2500	2715	2285	190	2649	2351	56	33	8	178	47	120	0.5	18	2804.4	153	27.1	37.5	1700
	022.50.2500													20	2816	138	30.1	41.8
16	021.50.2800	3015	2585	190	2949	2651	56	33	8	178	47	120	0.5	18	3110.4	170	27.1	37.5	1900
	022.50.2800													20	3116	153	30.1	41.8
17	021.60.3150	3428	2872	226	3338	2962	56	45	8	214	56	150	0.5	20	3536	174	37.7	52.2	3300
	022.60.3150													22	3537.6	158	41.5	57.4
18	021.60.3550	3828	3272	226	3738	3362	56	45	8	214	56	150	0.5	20	3936	194	37.7	52.2	3700
	022.60.3550													22	3933.6	176	41.5	57.4
19	021.60.4000	4278	3722	226	4188	3812	60	45	10	214	56	150	0.5	22	4395.6	197	41.5	57.4	4200
	022.60.4000													25	4395	173	47.1	65.2
20	021.60.4500	4778	4222	226	4688	4312	60	45	10	214	56	150	0.5	22	4879.6	219	41.5	57.4	4700
	022.60.4500													25	4895	193	47.1	65.2

Note:

1. N1 is the numbers of lubricating holes. Oil cup M10×1JB/T7940.1~JB/T7940.

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

3. n-φ can change to tapped hole, the diameter of tapped hole is M, and depth is 2M.

4. The tangential tooth force in the form is the max tooth force; the nominal tangential tooth force is 1/2 of the max one.

5. "K" is addendum reduction coefficient.