What are the performances of joint bearings?

2019-08-22 16:29:21

Because the structure and working mechanism of the joint bearing are completely different from that of the rolling bearing, the joint bearing has its own technical characteristics and maintenance requirements.
working temperature
The allowable working temperature of the joint bearing is mainly determined by the matching material between the bearing sliding surfaces, especially the plastic sliding surface of the self-lubricating joint bearing. At high temperature, the bearing capacity of the joint bearing will decrease. If the sliding surface material of lubricated joint bearing is steel/steel, its allowable working temperature depends on the allowable working temperature of lubricant. But for all lubricated and self-lubricated joint bearings, they can be used in the temperature range of - 30 ~ + 80 ~C, and maintain the correct bearing capacity.
Dip angle
The inclination angle of the joint bearing is much larger than that of the general adjustable rolling bearing. It is very suitable for the support parts with low concentricity requirement. The inclination angle of the joint bearing varies with the bearing structure size, type, sealing device and support form. The inclination angle range of the general centripetal joint bearing is 3 ~15 degrees, and the angular contact joint bearing. The inclination range of thrust joint bearings is from 2 to 3 degrees, and the inclination range of thrust joint bearings is from 6 to 9 degrees.
In any case, the matching selection of the joint bearing shall not cause uneven deformation of the ring. The matching nature and grade of the joint bearing shall be determined according to the working conditions such as bearing type, support form and load size.
The loading and unloading of joint bearings should follow the following principles: the force exerted by assembly and disassembly can not be transmitted directly through the spherical sliding surface. In addition, auxiliary loading and unloading tools, such as sleeves and dismantlers, should be used to apply the external loading and unloading force directly and evenly on the matching rings, or to carry out unloaded loading and unloading by heating and other auxiliary methods.
When assembling the joint bearing series, it is necessary to pay special attention to the position of the outer ring partition surface. In order to avoid coincidence directly acting on the segmentation surface, it is necessary to maintain the segmentation surface at right angle with the coincidence direction.
The oil-fed joint bearing can be operated without lubrication when the load and swing motion are very small. Nevertheless, in general, grease supplements must be lifted. In the initial installation and operation, it is suggested that the lubrication cycle should be moderately shortened.
Oil-free joint bearings can be used without lubrication. However, if lithium soap-based grease is added before operation, the service life of the joint bearing can be prolonged. If grease is injected into the space around the bearing, the joint bearing will be more effective in preventing the invasion of dust and foreign bodies.