Heavy-duty bearing selection - bearing the main points of the knowledge

Heavy-duty bearing type selection and the main points of the high points in the selection of bearing rigidity are basically the same. Heavy-duty bearing application problems, must be combined with the working characteristics of heavy-duty bearing consideration. Heavy-duty bearing work often are in a state of high stress, the bearing is sensitive to high stress, so the application technology of all links to strive to reduce the stress of the bearing, the stress of slow is very beneficial to prolong the life of bearing. Machine such as high load under the condition of axial position allows, the original with a protection for the single bearing multiplication of two only to bear radial load, and despite the influence of uneven load, under the condition of the same workpiece, the fulcrum of two bearings under the condition of different than the original single bearing life, is expected to increase more than twice as much. As a matter of fact, in the heavy machinery is often in a fulcrum to use multiple bearing or more columns bearing to bear radial load. Cooperate, clearance and lubrication of the overloaded bearings, clearance and lubrication of the overloaded bearings must be unified. In order to ease the stress of the overloaded bearings, hope thick lubricating film, so be using high viscosity lubricating oil or high viscosity of oil as base oil and grease at the same time hope to guarantee good lubrication condition, caused by lubricant viscosity friction moment not too high. Heavy-duty bearing rotating ring fit interference quantity is larger than normal, and the raceway deformation and bearing life has adverse effect, so if possible, hope interference quantity reduced, this requires a lower with the roughness of the surface, at the same time keep the lubrication is normal, because the lubrication failure, one thousand under the overloading of raceway surface excessive friction torque to reinforce with surface creep trend, appear even skid phenomenon, although the phenomenon occurs in the outer ring, - But when serious inner ring is unavoidable. Outer ring of the actual cooperate attention should not be a big gap, in order to avoid oil penetrate the surface, prompting skid phenomenon, and make the ring is easy to deformation, reduce the bearing capacity of bearing area. Is only allowed after rigorous take effective countermeasures, appropriate to reduce heavy bearing with interference, the interference and the quantity is slightly reduced, for the improvement of the bearing stress state is bigger, of course, increasing the benefits of the oil film is even greater. Due to overloading of rolling bearing surface contact area is large, with tight, ring close to the amount and the deformation is bigger, so usually bearing clearance is bigger. From the host on the design to improve all the shaft bearing conditions of use in the transmission chain of the host should take appropriate high rotational speed, until the drive to down to work again when spindle speed, and for the installation of main shaft bearing parts should be bigger, is easy to choose larger bearings, the bearings are very good.