& nbsp; & nbsp; bearing clearance can be divided into axial clearance and radial clearance according to the direction of measurement. Radial clearance is the basis for the distribution of bearing inner group, outer ring and rolling body. It is also an important technical quality requirement item and an important inspection item stipulated in national standards. From the point of view of bearing application, clearance is also one of the important technical indicators. Whether the bearing can achieve satisfactory performance depends largely on its radial clearance. From the aspect of bearing design and use, clearance can be divided into design clearance, original clearance and installation clearance.



& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; the clearance after the assembly of the bearing is the original clearance, and after the installation of the host, the clearance is changed, which is called installation clearance (or coordination clearance), while the clear When the bearing is working, the temperature rise will change the internal and external temperature difference, which will reduce the installation clearance. At the same time, the load will cause the elastic deformation of the rolling element and the ring, and increase the clearance. In the case of a ship, the working clearance is slightly larger than the installation clearance. In order to obtain satisfactory working performance, the appropriate working clearance should be selected.



& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; bearing through a certain amount of negative clearance requirements, can make the bearing has a certain pre-tightening pseudo, the purpose is to improve the rigidity of the bearing, but also to improve the service life of the bearing. When the preloading load exceeds the upper limit of the optimum range, the rigidity of the bearing increases slightly, while the friction and heat increase sharply, and the service life of the bearing decreases sharply. When the clearance is too large, the number of rolling elements bearing load is less, the large load of rolling element is larger, and the bearing life will also be reduced.