Four-point Contact Ball Slewing Bearing Made In China

1.Luoyang four-point contact ball slewing bearing’s installation technical requirements and specifications

Luoyang four-point contact ball slewing Bearing’s installation technical requirements and specifications: To sum up, nothing more than the following:

1. First determine the rotation accuracy, clearance, end runout and center diameter of gear meshing of the slewing bearing

2. Secondly, determine the levelness of the bearing base to ensure that the installation base is certified, not inclined, and has a solid structure

3. Determine the position of the soft belt of the four-point contact ball slewing bearing, S mark, three red marks on the tooth surface, or there are obvious red belt marks on the inner and outer rings of the bearing, and try to place them in the non-recurrent load area.

4. The rotation of the new four-point contact ball slewing bearing is normal and smooth, not stuck, not stumbling, not swinging, vibrating, and the amplitude is stable.

5. The lubrication of new bearings is generally 100 hours, and after three months, 500 hours, heavy-duty bearings ensure sufficient lubricating grease

6. The bearing load should be balanced, with infrequent partial load and shock load

7. The new bearings have been inspected and tested before leaving the factory. After installation, there is a small problem. At this time, the installation skills should be carefully adjusted, such as the adjustment of the installation bolts, the adjustment of the four-point contact ball slewing bearing force, whether the meshing is abnormal, whether the grease is sufficient, and whether there is any the existence of interfering objects.

2.Influence of Clearance on Rotational Accuracy and Life of four-point contact ball Slewing Bearings

First of all, the clearance value is divided according to the accuracy grade of the four-point contact ball slewing bearing, which is P0/P6/P5/P4 in order, so that the clearance is 0 and the clearance is negative.

It can be said that the size of the clearance value determines the machining accuracy and difficulty of the four-point contact ball slewing bearing, and it affects the machining accuracy of other parameters.

The clearance above 0 does not actually affect the rotation performance. If it involves positioning, measurement and control and repeated positioning, even if it stops immediately, a negative clearance is necessary.

If it is required for rotation, the size of the clearance value cannot determine the life and reliability of the four-point contact ball slewing bearing.

To put it bluntly, the clearance value is artificially divided into several steps one by one according to the size and diameter of the bearing, from P0-P4, the range is reduced in turn. The actual required clearance value is determined according to the specific requirements of the working conditions. In fact, the accuracy level of the bearing should be more suitable for its requirements. For example, the clearance value can be narrowed, or it can be set to 0 clearance and small clearance. Wait.

The working condition is the only indicator that determines the bearing clearance. It cannot be done step by step, and the various parameter values of the bearing grade can be applied mechanically.

The three key indicators of high-precision slewing bearing in actual operation, end face runout, tooth runout and clearance, should be said to be the most critical. Moreover, the three indicators are interrelated, and the true reflection of the clearance value is a key part of the slewing bearing processing process.

In order to realize the positional relationship that is determined immediately after stopping, that is, technical requirements such as measurement and control, positioning, reciprocating positioning, and repeated positioning, a friction value needs to be specified. The written meaning is friction torque and starting torque.

The relationship between backlash and starting torque is succinctly stated:
The starting torque of 0 clearance is very small, and it can rotate normally and smoothly. The bearing below 1 meter is below 30N.m, and the bearing below 2 meters is below 100N.m; -0.02/0 obviously feels the heavy torque, -0.05 The clearance can better reflect the existence of negative clearance. The greater the negative clearance, the greater the starting torque.