Double Row Ball Slewing Bearings

The LTZC double-row ball slewing bearing can carry axial load tilting moment and radial loads at the same time.The top ball mainly carries the axial load and positive tilting moment. The drop ball takes the opposite tilting moment. This is the reason for the loading capacity of the double row ball slewing bearing being larger than the four-point contact ball slewing bearing;however, the frictional ratio is much larger.than the latter.The LTZC double row ball slewing bearing consists of a inner ring outer ring.balls in double rows, spacers, sealing device, and other components. Due to the top ball mainly taking the axial load and tilting moment loads, the size of top balls are larger than the drop ball. In order to accommodate the various working condition at different axial load, tilting moments and axial load.the angle of contact would be adjusted accordingly.The rings structure can be divided into two types, integral type and split type.Generally,the integral type maintains a stronger rigidity. The split type is more convenient to adjust; the two segregate rings are fastened by bolts prior to delivery.The LTZC double row slewing bearing has cages (or spacing blocks) among the balls.Only when large loading is requested would the full ball type be applied. Loading capacity for full ball type is definitely larger.However, the increased friction generated by this design allows for the balls to be easily scratched.The double row slewing bearing is mainly for the working conditions when carrying an axial load, larger tilting moment, and where the mounting place is limited in radial direction. This structure provides good performance when fit into an installation when an amount of deformation may be allowed.

Features of Double Row Ball Sewing Ring Bearing

Double-row ball slewing ring bearing usually comprises 3 rings, steel balls and spacers can enter the upper and lower raceways directly. Two sets of steel ball are placed based on the force analysis. With such configuration, the 90° bearing angles of the upper and lower arc raceway enable the bearing to take large axial force and tilting moment. Special design is needed for the raceway when the radial force is greater than one tenth axial force.

Basic Structure includes:

Without gear(Type020)

With external gear(Type 021/022)

With internal gear(Type 023/024)

Range of external diameter: 100 mm to 15000 mm

Ring material: 42CrMo / 50Mn/ C45

Ball/roller material: GCr15

Cage material: steel 20 or ZL102 cast aluminum alloy

Spacer material: nylon 6 / nylon 66

Quenching hardness of raceway: HRC55-62

Tooth type: no gear, internal gear, external gear

Applications

Excavator

Crawler crane

Port machinery

Amusement facilities

Custom Bearings

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