 Slewing bearings are used widely such as the industry of crane machinery, engineering machinery, transport machinery, metallurgical machinery, food process machinery, medical care machinery, wind power and port machinery and so on.
1 Four-point Contact Ball
Bearing has two raceways respectively on inner ring and outer ring and can accommodate radial force, axial force and tilting torque. Under pure axial load, each steel ball only contacts one raceway on inner ring and outer ring. When the external radial load exceeds certain volume, steel balls will contact four raceways simultaneously. Steel balls should try to contact with each raceway in order to prevent larger abrasion or damage. Therefore, this type slewing bearings are mainly applied to the occasion that the axial load is predominant and tilting torque is larger.
2 Double-row ball with different diameter
Bearing is comprised of double row steel balls in upper and lower layers, inner ring and outer ring, spacer, lubricating and seal fittings. The inner ring and outer ring are in two separate structures and two half rings need to be fixed by joint bolts. Due to the upper and lower rows of steel balls, the bearing can carry radial force, axial force and tilting torque simultaneously. Mostly, the bearing is working under axial force and tilting torque together.
3 Single row cross cylindrical roller
The bearing has one row of cylindrical rollers and the axial lines of neighbor rollers are crossed in 90°. There are two raceways respectively on inner ring and outer ring and the end face of raceway is in straight line. Half of the rollers accommodate the downward axial force and another half rollers bear the upward axial force. Therefore, the bearing can carry the radial force, axial force and tilting torque. 4 Three-row cylindrical roller combination
The slewing bearing possesses high load capacity which is mainly used in the occasion with heavy load. The bearing is comprised of inner ring and outer ring (rings are in two parts inc. the upper and the lower respectively), one row of cylindrical rollers in vertical disposition, two rows of cylindrical rollers in upper and lower horizontal disposition, seals and lubricating fittings. The axial force from two directions and tilting torque are carried by the two rows of cylindrical rollers in upper and lower horizontal disposition, the radial force is carried by the rollers in vertical disposition.
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