IKO bearing preloaded and assembly technique analysis

IKO bearings remove and install the same carefully. Careful not to damage the bearing and the parts, especially interference fit the bearing down, and the operation is difficult. So, in the design stage to consider in advance to facilitate disassembly, designed and manufactured according to need remove the tools is also very important. When disassembling, according to the drawings the disassembly method, sequence, investigate the matching of the rolling bearing conditions, to ensure foolproof disassembly operations. 1, the outer ring of the removal of removal of interference fit of the outer ring, beforehand in setting several outer shell on the circumference of a circle of extrusion screw with screws, one side equal to tighten the screw, remove. The screw hole cover usual blind plug, the separation of tapered roller bearing type bearing, shoulders set several incisions in the shell, using block, remove by press, or tap the disassembly. 2, remove the inner ring of the remove of cylindrical hole bearing, can use simple mechanical pull out the latest pressure. At this time, must pay attention to the inner ring under the pulling force. Remove the oil pressure method is used to large bearing inner circle. By setting on the axis of hydraulic oil hole, in order to make easy to pull out. Width of the bearing is oil pressure method and drawing fixture and disassembly operations. NU, NJ cylindrical roller bearing inner ring remove can take advantage of the induction heating method. In a short time heating the local, make the inner ring expansion after drawing method. 3, remove the removal of relatively small band of taper hole bearing sleeve bearing, with fastening on the shaft gear support inner ring, the nuts back a few times, use the block with a hammer beating the disassembly. Large bearing, using the hydraulic remove easier, in the oil hole on the shaft taper hole pressure oil, make the inner ring expansion, remove the bearing method. Operation, has a bearing may suddenly emerge, it is best to nut used as gear block as well. Preloaded refers to IKO bearing load, make between roller and raceway produces a certain amount of deformation, in order to make all in a state of uniform pressure roller. Bearing preloaded, can to improve the rotary accuracy, rigidity, damping and service life, the purpose of reducing vibration and noise. When rolling bearing is used commonly for axial positioning preloaded or constant pressure axial preload. Under the same preload, constant pressure increase pre-tightening axial stiffness of bearing system was not significant, but the positioning preloaded, axis and the thermal deformation of ring affects the quantity of preloaded. General requirements of high stiffness used positioning preloaded. Rotation of high precision in high speed, requirements, and to prevent roller sliding occurs, appropriate USES constant pressure preload. Pre-tightening force is too large, will increase the friction, wear and temperature rise of IKO bearing, reduce the noise of rolling bearings and grease life, bearing damage. So is very important to choose suitable pre-tightening force. In general, under the condition of high speed light load, or improve the rotation accuracy required, should choose light preload. In the medium load or low speed heavy load conditions, in order to improve the bearing stiffness for the purpose, or weight should choose the preload preload. Correctly selecting preloaded amount must carry on the theoretical calculation, and according to the experience of using. Pre-tightening was measured accurately when installation is difficult, at the same time, the amount of preloaded on the friction and the influence of the temperature rise is very complicated, by measuring the friction torque, axial axial displacement to choose and control the amount of preloaded.