Spherical bearing

The spherical bearing is actually a variant of the deep groove ball bearing, characterized by its spherical surface of outer diameter, which can be fitted into the corresponding concave spherical surface of the bearing seat for centering purposes.

Although its basic performance should be similar to that of deep groove ball bearings, due to the fact that this type of bearing is mostly used in relatively rough machinery, where installation and positioning are not accurate enough, the axis alignment between the shaft and the seat hole is poor, or the shaft is long and has a large deflection, and the accuracy of the bearing itself is not high enough, some structures are also relatively rough, so the actual performance of spherical bearing is not good as deep groove ball bearings with the same specifications. For example, an outer spherical ball bearing with a top screw is applied to through-shafts with large stiffness differences and deflections. This type of bearing is equipped with sealing rings on both sides, which can tightly prevent the invasion of dirt and has been loaded when leaving the factory.

Spherical bearings are preferred for applications requiring simple equipment and components, such as agricultural machinery, transportation systems, or construction machinery.

It is mainly used to bear combined radial and axial loads, especially radial loads. Generally, it is not suitable to bear axial loads alone. This type of bearing can be installed with an inner ring (with a full set of rollers and retainers) and an outer ring respectively. This type of bearing does not allow the shaft to tilt relative to the housing, and will generate additional axial forces when subjected to radial loads. The size of the axial clearance of this type of bearing has a significant impact on the normal operation of the bearing. When the axial clearance is too small, the temperature rise is high; When the axial clearance is large, the bearing is easily damaged. Therefore, during installation and operation, special attention should be paid to adjusting the axial clearance of the bearing. If necessary, pre interference installation can be used to increase the rigidity of the bearing.

Classification of spherical ball bearings

Spherical ball bearings can be divided into three categories according to the method of cooperation with the shaft:

1、 The codes of the spherical ball bearings with top screw are: UC200 series (light series), UC300 series (heavy series), and the variant product UB (SB) 200 series. If the application environment fits less, usually choose UC200 series, otherwise choose UC300 series. Generally, there are two jackscrews on a spherical ball bearing, with an included angle of 120 °. The feature is that when cooperating with a shaft, the jackscrew is used to jack the shaft, and then achieve a fixed effect. This kind of spherical ball bearing is widely used in various manufacturing business lines such as textile machinery and ceramic machinery.

2、 The codes of tapered spherical ball bearings are UK200 series and UK300 series. This type of spherical ball bearing has a tapered inner hole with an inner diameter of 1:12 shares, which needs to be used in cooperation with the tightening sleeve. The characteristic of this type of spherical ball bearing is that it can bear greater loads than the spherical ball bearing with a top screw.

3、Spherical ball bearings with eccentric sleeves are coded as UEL200 series, UEL300 series, and SA200 series. The primary feature of this type of spherical ball bearing is that the upper end of the bearing has a certain degree of eccentricity what is working together with the eccentric sleeve. This type of bearing is primarily used on agricultural machinery (harvesters, straw returning machines, threshers, etc.). Under conditions of relatively strong pulsation, eccentric cooperation can effectively reduce the strong pulsation.