خوش آمدید

Macroscopic test analysis of double row tapered roller bearings Double-row tapered roller bearings are used in the pulley block of the oil drilling crane. This situation is extremely easy to occur in small taper tapered roller bearings. The failure characteristics caused by the reverse loading of such rollers into the bearing are very typical, that is, only individual rolling elements and inner rings in the failed bearing fail, and other parts are basically intact. After disassembly, it was found that the upper bearing of the pulley was broken. To Figure 2 A side inner ring peeling roller assembly state 1) The macro and micro morphology of the fracture of the inner ring on side A..

In this position, the contact stress will be much greater than other positions, and even a normal working oil film cannot be formed in this position during operation. Eventually cause the inner ring to fracture. It is found that the spalling spreads from the small end of the inner ring to the large end face, that is, the small end face of the inner ring receives a larger load. Clutch Release Bearing manufacturers To Figure 5 Spalling morphology of bearing inner ring 2) Shape of peeling roller There are 52 side rollers in total, and one end of the damaged roller is severely peeled off (Figure 6). In order to find the cause of the bearing failure, the fracture and stress condition of the bearing were then re-examined, and the fracture of the broken inner ring of the bearing was analyzed.

The bearing assembly must be tapered. The pulley was abnormal after use for about 30 days.6mm) and the roller taper is small, when a roller is reversely installed into the bearing inner ring, the influence of the roller on the entire inner ring is difficult to find. It is found that the severely wo part of the damaged roller is at the large end surface. To Figure 7 Abnormal morphology of a window of the A side cage 2. It can be seen that the spalling source is located in the circle, with the spalling source as the source, the spalling extends to one side and below (the side of the large end face).

Under repeated extrusion of the reverse mounted rollers, the peeling expands into the inner ring of the bearing. To Figure 3 Macro morphology of the inner ring on side A The fracture area of ​​the raceway of the bearing inner ring was selected for inspection, and it was found that the fractures all extend inward from the spalling part of the raceway surface, and the fracture sources are mostly parallel (Figure 4). Press the working surface to form a large number of rolling pits in the raceway of the bearing inner ring.