Double Row Ball Slewing Bearing

Double Row Ball Slewing Bearingusually include same size rolling element and different size rolling element. The heavy duty ball bearing turntableis composed with two rows ball which can bear much higher axial, radial and overturning moment that is widely used on heavy equipment, like mining equipment and large crawler crane. As one of the professional slew ring bearing manufacturers, SWBTEC double row slewing bearinghas been assembled on many customer's machine, and have received high reputation from end user, as we can help the end user to maximize their machine and provide timely and effective after-sales service and technical support of the ball bearing swing.

Double Row Ball Slewing Bearing Features and Benefits

SWBTEC recommend customers to choose double-row slewing bearing according to the customer's requirements for bearing load capacity.

The double row ball slewing bearing can withstand larger axial loads, appropriate radial loads and overturning moments. Compared with three-row slewing bearings, the double row slewing bearing can lower procurement costs for customers.

The three row roller slewing bearing meets the requirements of small size and large load. However, when the eccentricity of the axial load is relatively small, the bearing capacity of the three-row slewing bearing is rich and the cost is relatively high.

Our company engineers have strong product design capabilities, please feel free to contact us if you need double row slewing bearing.

Double Row Ball Slewing Bearing Application

Double row slewing bearing is a kind of slewing bearing which is used on ship cranes. There are generally 4 pieces of slewing bearings on ships to share the loading and unloading operations of the ship, and the service life is generally required to be 6-10 years. Therefore, it is very important to ensure the reliability and durability of the slewing bearings.

The characteristics of marine slewing bearings are high flexibility, and relatively high rotational speed and the load is generally between 15-30 tons, so four-point contact ball bearings are widely used. But what are the design features and advantages of single-row and double-row ball bearings?

First of all, the height of the single row ball slewing bearing should be high, and the steel ball should be 60-70mm to ensure that the bearing capacity is competent and the sealing performance is better. In the early use of the bearing, the application is very high, and the user feedback is good. The characteristic is that the height is high and the steel ball is enlarged, which improves the rigidity and strength of the bearing and is a very good choice.

The double row ball bearing is based on the consideration of flexibility of the slewing bearing, and the structural consideration which increased to reduce the excessive fatigue of the raceway and the steel ball, thereby improving the life and stability of the slewing bearing. The design considerations are perfect, but the application process is flawed, and the raceway force sometimes appears eccentric.

Combining the slewing bearings of the two structures, because the starting points are slightly different, they both have a good and stable record on the ship crane. From the feedback, the advantages and disadvantages are not obvious, and both structures are still good choices. Of course, the price of double-row slewing bearings is significantly higher than that single-row slewing bearings.

Installation requirements for the double row slewing bearings

Ensure Cleanliness:

Before installation, make sure the mounting surfaces and mating components are clean and free from debris, dirt, or other contaminants that could affect the bearing's performance.

Proper Alignment:

Ensure accurate alignment of the double row slewing bearing with the mating components. Misalignment can lead to increased stress, premature wear, and reduced bearing life.

Torque Specifications:

Follow the manufacturer's recommended torque specifications for tightening the mounting bolts. Over-tightening can cause excessive preload, while under-tightening can lead to looseness and misalignment.

Lubrication:

Apply the appropriate lubricant to the surfaces of double row ball bearing during installation. Follow the manufacturer's recommendations for the type and quantity of lubricant to be used. Adequate lubrication helps reduce friction, minimize wear, and dissipate heat effectively.

Double Row Ball Slewing Bearing Specifications

	Model	Configuration Size			Mounting Size						Structural Size		Gear Data				weight kg
																		D	d	H	D1	D2	n1	φ	n2	φ2	H1	h	B	module	Da	Z
		1	SW-476.25	565	382	98	540	410	24	17	24	17	88	10	60	5		595	117	88
2	SW-576.20	670	470	92	640	508	18	17	18	17	83	9	60	5	695	136	110
3	SW-691.25	785	590	99	753	628	21	36	21	36	89	10	89	10	836	81	138
4	SW-968.22	1042	893	92	1015	922	30	17	30	17	83	9	76	8	1080	133	155
5	SW-1215.25	1330	1095	108	1290	1135	48	23	48	23	98	10	90	10	1378	136	345
6	SW-1248.40	1414	1085	144	1359	1139	44	28	44	28	135	9	115	12	1474	120	500
7	SW-1578.40	1744	1433	156	1671	1485	60	28	60	28	140	16	140	16	1805	109	910

	Model	Configuration Size			Mounting Size						Structural Size		Gear Data				weight kg
																		D	d	H	D1	D2	n1	φ	n2	φ2	H1	h	B	module	da	Z
		1	SW-755.25	875	628	104	823	675	40	26	40	26	95	9	81	10		582	59	200
2	SW-888.22	982	792	97	944	826	36	22	36	22	87	10	80	8	754	95	170
3	SW-1088.20	1172	1010	97	1134	1040	36	17	36	17	88	9	80	10	962	97	175
4	SW-1100.25	1196	1010	110	1160	1040	36	31	36	31	96	14	90	10		98	240
5	SW-1222.25	1345	1115	108	1290	1150	40	21	40	21	98	10	88	10		108	360
6	SW-1350.30	1470	1230	108	1425	1270	48	34	48	34	98	10	90	12	1179	100	365

Double Row Slewing Bearing FAQs

QHow does a double row slewing bearing differ from a single row slewing bearing?

A ball bearing swing differs from a single row slewing bearing in terms of its structure and load-carrying capacity. Here are the key differences between the two:

Structure: A single row slewing bearingconsists of a single row of rolling elements (typically balls or rollers) placed between two rings. In contrast, a double row slewing bearing has two rows of rolling elements, with each row positioned between two rings. This arrangement provides increased load-carrying capacity and improved stability.

Load Capacity: Due to the presence of two rows of rolling elements, a double ball bearing turntablecan handle significantly higher axial, radial, and moment loads compared to a single row slewing bearing. The additional row of rolling elements distributes the load more evenly, resulting in enhanced load-bearing capabilities.

Stiffness and Stability: The double row configuration improves the stiffness and stability of the slewing bearing. It offers increased resistance to deformation and deflection under heavy loads.

For more information about slewing bearing price, please feel free to contact us!

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