Due to the complex structure of many machines, multiple sets of bearings are required. A set of bearings at the same time by two bearing structure form combination of rolling bearings. Such as needle roller and thrust cylindrical roller combination bearings, needle roller and thrust ball combination bearings, needle roller and angular contact ball combination bearings, etc.. And one of them is widely used than the roller bearings. Its unique design is the rolling bearing with short cylindrical, tapered or waist drum shaped roller as rolling body. It is mainly used in the following fields: textile machinery, printing machinery, automobile industry, household appliances, money detectors. 1.Combination bearing combination form Combination bearing several combination forms. 1. Needle roller and thrust ball bearings without inner ring 2. without inner ring needle roller and thrust ball combination bearing with outer cover 3. needle roller bearings with inner ring and thrust ball bearings with outer cover 4. needle roller and angular contact ball bearings 5. Needle roller and three-point contact ball bearings 6. needle roller and thrust cylindrical roller combination bearings without inner ring 7. needle roller bearings without inner ring and thrust cylindrical roller bearings with outer cover 8. Combined needle roller and thrust cylindrical roller bearings with inner ring 9. inner ring needle roller and thrust cylindrical roller bearings with outer cover combination 10.Needle roller and two-way thrust cylindrical roller combination bearings 11.Needle roller and two-way thrust cylindrical roller combination bearings with flange 2.Combined bearing clearance adjustment The size of the clearance has a great influence on the rotary accuracy, load, life, efficiency and noise of the bearing. In order to ensure the normal operation of the bearing, usually the combination of bearings inside the appropriate axial and radial clearance. Clearance is too large, the bearing rotation accuracy is reduced, noise increases; clearance is too small, due to the thermal expansion of the shaft so that bearing load increased, life shortened, efficiency reduced. Therefore, the bearing combination assembly should be according to the actual working condition to adjust the clearance appropriately, and from the structure to ensure that can be easily adjusted. The common method of adjusting clearance has the following three kinds. (1) shim adjustment The angular contact bearing combination shown, by increasing or reducing the thickness of the shim group between the bearing cover and the bearing housing to adjust the clearance. Deep groove ball bearing combination of thermal compensation clearance is also adjusted by shims. (2)Screw adjustment Use the screw and the disc-shaped parts to adjust the bearing clearance, the nut plays a locking role. This method is convenient to adjust, but can not withstand the large axial force. (3)Round nut adjustment Two tapered roller bearing reverse structure, bearing clearance by round nut adjustment. But the operation is not very convenient, and the thread will weaken the strength of the shaft. 3.The effect of temperature on the efficiency of the combined bearing Combined bearing will be warmed up after the start of operation, after a period of time, that is, at a lower temperature (usually 10~40 degrees higher than the room temperature) in the normal state. The time to normal state is different according to the bearing size, form, rotating speed, lubrication method, and the exothermic conditions around the bearing, which takes roughly 20 minutes to several hours. Combined bearing temperature does not reach the normal state and abnormal temperature rise, the following main reasons can be considered. 1, too much or too little lubricating oil 2、Bad installation of the bearing 3、The combination bearing internal clearance is too small, or the load is too large 4、The seal device friction is too big 5、Lubricant does not match 6、Creep of the mating surface In addition, if there are the above conditions, should stop as soon as possible and take the necessary measures. Temperature is essential to maintain proper bearing life and prevent lubricant degradation! Suggestion: It is ideal to use the bearings in non-high temperature condition (generally below 100 degrees) as much as possible. When replacing the combination bearings, the new bearings should be carefully inspected, while the shaft diameter and bearing seat holes and rotor for meticulous inspection and assembly and disassembly of bearings, strict implementation of the maintenance process, careful operation, to avoid improper installation and disassembly of bearings caused by damage. Add oil and change oil on time to ensure that the working condition of the bearing is always in good condition; check carefully during the operation of the combination bearing, find the hidden trouble of failure and eliminate it in time.  

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