The rolling bearing is composed of the above two bearing structures in a set of bearings at the same time. Such as needle roller and thrust cylindrical roller combined bearing, needle roller and thrust ball combined bearing, needle roller and angular contact ball combined bearing, etc. Several combined forms of combined bearing

1. Needle roller and thrust ball combined bearing without inner ring 2 Combined thrust ball bearing without inner ring needle roller and with outer cover

3. Combined bearing with inner ring needle roller and thrust ball with outer cover

4. Needle roller and angular contact ball combined bearing

5. Needle roller and three-point contact ball combined bearing

6. Needle roller and thrust cylindrical roller combined bearing without inner ring

7. Cylindrical roller bearing inner ring and outer belt without thrust

8. Combined bearing with inner ring needle roller and thrust cylindrical roller

9. Combined thrust cylindrical roller bearing with inner ring needle roller and outer cover

10. Needle roller and bidirectional thrust cylindrical roller combined bearing

11. Needle roller with flange and two-way thrust cylindrical roller

Affect efficiency

The combined bearing will rise in temperature after starting operation, and after a period of time, it will be in normal state at a lower temperature (usually 10 ~ 40 degrees higher than room temperature). The time to normal varies according to the size, form, rotation speed and lubrication method of jXN bearing, and the heat release conditions around the imported bearing. At this time, it takes about 20 minutes to several hours. When the bearing temperature does not reach normal and abnormal temperature rise occurs, the following reasons can be considered. In addition, shut down as soon as possible and take necessary countermeasures. Temperature is very important to maintain the proper service life of imported bearings and prevent the deterioration of lubricating oil. It is recommended to control it as far as possible under non high temperature conditions (generally below 100 ℃). The main reason for abnormal temperature rise is too much or too little lubricating oil. The IKO bearing is poorly installed. The internal clearance of the combined bearing is too small or the load is too large. Excessive friction of sealing device. Lubricant does not match. Creep of mating surface. Secondly, check the raceway surface of the bearing, the condition of the rolling surface and joint surface, as well as the wear condition of the confrontation frame for damage and abnormal conditions. In particular, check the running track of the raceway surface. To judge whether the bearing can be used again, we should think about the damage level of the combined bearing, mechanical function, priority, operation premise, search and inspection cycle, etc. When the combined bearing can be replaced, the new bearing shall be carefully inspected, and the shaft diameter, bearing seat hole and rotor shall be carefully inspected. When assembling and disassembling the bearing, the maintenance process shall be strictly implemented and the operation shall be carefully conducted to avoid bearing damage caused by improper assembly and disassembly, and the oil shall be added and changed on time, so as to ensure that the working condition of the bearing is always in good condition; Check carefully during the operation of the combined bearing, and eliminate the hidden trouble in time if it is found.