Double Row Ball Slewing Bearing

Double Row Ball Slewing Bearing usually include same size rolling element and different size rolling element. The heavy duty ball bearing turntable is 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 bearing has 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

No. 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

No. 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 10 963.5 98 240

5 SW-1222.25 1345 1115 108 1290 1150 40 21 40 21 98 10 88 10 1061.6 108 360

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 bearing consists 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 turntable can 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!