China Industrial Positioners Slewing Bearing Manufacturer

1.Ball Raceway Advantages of Slewing Bearings

The raceway of the slewing bearing is divided into a ball raceway and a ball raceway. The advantage of the ball raceway is that it has four-point contact, is flexible, and has resistance to fatigue.

Therefore, the application field of the slewing bearing in the four-point contact is generally heavy load Crane bearings under 100 tons, excavator bearings, crane bearings and crawler crane bearings, cement pump truck bearings with double row ball bearings, and the like.

The raceway is a ball bearing with a linear raceway, which is generally suitable for heavy-duty fields and requires a good cage design. Because the ball is prone to sliding friction on the horizontal raceway, not the raceway friction, to put it bluntly, the ball is prone to slipping on the raceway surface, and the rotational performance is far inferior to that of a ball bearing.

The advantages of ball bearings are flexible, widely used, and poor in heavy loads. Ball bearings have good high load-carrying performance, but poor rotational flexibility and are suitable for low-speed rotation.

2.Clearance value of slewing bearing

Three interpretations of the clearance of the slewing bearing and the clearance value of the slewing bearing:

1. Compensate for manufacturing errors

2. Make up for the loss of installation accuracy

3. Meet the requirements of the working conditions for the rotation accuracy

Whether it’s important or not can’t be generalized. The clearance value of the bearing is artificially divided and specified, and is divided into a certain range according to the size, which is used as a reference value in the processing process.

Therefore, if it is not specially required by the working conditions, the clearance of the bearing can be allowed within a certain range. It is generally considered that the overflow space of 0.05/0.1, even if it is out of tolerance, is not enough to affect the quality of the slewing bearing itself.

Secondly, the clearance of the slewing bearing also compensates for the installation error. If the clearance is too small and the installation plane is very rough and uneven, a certain clearance value can be relaxed, so as to ensure the normal rotation of the bearing, so as to prevent the bearing from being installed and affected by Uneven force, stuck and unsmooth rotation under partial load.

Of course, the regulation of the clearance value cannot be sloppy when the design rotation accuracy is high. Generally speaking, 0 clearance or negative clearance, at least ensure that the bearing cannot have clearance, that is, stop immediately and point accurately, Repeated positioning and starting torque are all actions that are specifically realized under the design of working conditions.

At this time, the clearance is very important for the slewing bearing. Even if the starting torque is not within the test range, the clearance value is guaranteed to be within -0.02/0.

3.Slewing Bearing advantage

Advantages and applicable working conditions of four-point contact ball slewing bearing The four-point contact ball bearing is a single-row angular contact ball bearing, and its raceway is designed to withstand bidirectional axial loads. The contact angle can be 30 degrees, 35 degrees, and 45 degrees.

The inner ring can be divided into two pieces, which can hold a large number of balls, so it has a large bearing capacity. The bearing is separable, that is, the two pieces of the inner ring and the outer ring with the ball and cage assembly can be installed separately. Four-point contact ball slewing bearing has a compact structure and light weight.

The steel ball contacts the arc raceway at four points, which can bear axial force, radial force and overturning moment at the same time, and has strong dynamic load capacity.
Applicable working conditions: The load is generally below 100T, and you can choose single-row four-point contact ball bearings, double-row ball contact ball bearings, and ball-ball combination bearings. The overall cage and segmented cage can be used to improve stability and service life, and the rotation speed can be appropriately increased to 30rpm-120rpm.

The accuracy level is best controlled.
At present, the common four-point contact balls include excavator bearings, truck crane bearings, crane bearings, crawler crane bearings, turret bearings, CT machine bearings, bottle blowing machine bearings, filling machine bearings, turntable bearings, and crane bearings. etc.