China Popular Wholesales Double Row Ball Slewing Bearing

1.Double row ball slewing bearing

Slewing ring bearings have unique bearing characteristics and are usually used in hoisting machinery, excavators, turntables, wind turbines, and other equipment. Most of the slewing bearings below three meters have a four-point ball structure, and the size of the load determines the height of the slewing ring, Diameter and size of channel steel balls.

If a large-load slewing bearing is required but the diameter is limited, the bearing capacity of the slewing bearing can generally be improved by increasing the steel ball. If the bearing capacity is still not met by increasing the steel ball, the structure of the double row ball slewing bearing can be adopted.

The slewing bearing satisfies the limited outer diameter size, but also requires a large load, which not only saves materials, but also improves the performance of the slewing bearing, so that the slewing bearing has greater axial radial load and tipping moment.

So how does the double row ball ball slewing bearing channel ensure the accuracy and mutual difference?

The channels of double row ball slewing bearings are divided into plane channels and arc channels, among which the channels of four-point contact ball bearings and double-row ball bearings are typical arc channels; the channels of crossed roller and three-row roller bearings are is a typical planar channel.

In terms of processing technology, the processing difficulty of circular arc channels is greater than that of flat channels, so there are naturally higher requirements for precision level and parameter control of actual processing.

Especially for the double row ball slewing bearing, the channel is two parallel arcs. In theory, the two rows of balls are subjected to force and run at the same time during the rotation process, but the probability of absolute simultaneous force and simultaneous operation is very low. exist on.

During the machining process, a certain error is allowed in the double-row ball channel. This error is not enough to affect the overall operating state of the slewing bearing.

This mutual difference is generally required to be within 0.03mm in the process. In order to achieve this goal, in the process of bearing grinding and matching, the machine tool needs to have good precision, and the workers need to have a skilled operation level.

If you want to achieve zero or negative double-ball clearance, the difference needs to be controlled within 0.01mm. Inside, for the double row ball slewing bearing, only by controlling the mutual difference between the channels can the slewing bearing exert its theoretical bearing capacity and its characteristics.

2.Double row ball slewing bearing

The LYMC 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 LYMC 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 LYMC 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.