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In general, accurate to use the full complement cylindrical roller bearings, fatigue life can be achieved. But if the accident occurred early damage, you can not re-use. Fatigue life, this early damage, known as a failure or accident. More than due to installation, use, lubrication on the ill-considered, lack of intrusion of foreign matter from the outside or the shaft and housing.
Full complement cylindrical roller bearing damage state such as roller bearing ring wall abrasions, the reason may be lack of lubricant grades inappropriate for oil discharge structure of the defect, foreign invasion, bearing misalignment or shaft The deflection is too large, there may be various reasons consolidated caused.
Therefore, only investigated the damage is difficult to know the real cause of injury. However, if in full knowledge of the use of bearing machine, on the basis of the working conditions and its peripheral structure and clarify the failure occurred before and after the situation, combined with the damage of the bearing and a variety of analysis of the causes, you can prevent similar failures again. Representative bearing damage causes and countermeasures.
Even with a contemporary highest manufacturing technology and processing full complement cylindrical roller bearings parts. Observe the reading changes with the pretension load method. The preload method has its negative aspects, as we all know. Its appearance always kept the dial gauge head against the appropriate parts of the end bearings or shaft.
1. Mechanical damage
Severe, occurs in the contact appearance metal stripping and thrown up a large area clutter scratch; under normal circumstances, the the bearing mechanical damage is again in the grooves of the different levels of the alloy outer bush. Contact surface damage and ablation phenomenon caused by the presence the bearing mechanical damage mainly due to the full complement cylindrical roller bearings is difficult to form the appearance of severe damage of the film or film.
2. Bearing cavitation
The outer surface of plastic deformation and work hardening occurs, full complement cylindrical roller bearings in the cylinder pressure shock load) under repeated. Partial loss of deformability, and gradually form a pattern and continues to expand, and then followed by the shedding of debris, contained outer layer formed hole. The general bearing cavitation thrown pits, then this pit gradually expand and cause cracking of the alloy layer interface, parallel to the direction of the crack along the interface expansion, until spalling. Bearing cavitation mainly because of the cross-section of the structural elements such as oil groove and oil hole passed to change the strong disorder caused by oil flow, oil flow disorders vacuum zone to form a bubble, then the pressure increases, the bubble collapse and cavitation. Cavitation generally occurs in high load bearing areas, such as the lower bearing of the crankshaft main bearings.
First, the structural design justice along with advanced, will have a longer bearing life. Manufacture of bearings generally via casting, heat treatment, turning, grinding and assembly of multi-channel processing. Fair process, to improve their predecessors, also affect the bearing life into chaos. Which affect the quality of the finished bearing the heat treatment and grinding processes, often have a more direct relationship with the failure of the bearing. In recent years, studies have shown that the deterioration of the bearing surface layer, the close relationship of the grinding process and the quality of the bearing surface.
Full complement cylindrical roller bearing materials metallurgical quality of the main factors affecting the move to bearing failure. Followed by metallurgy technology (such as bearing steel vacuum degassing, etc.) to improve the quality of raw materials is improved. Raw material quality factors in the full complement cylindrical roller bearing failure analysis in the proportion has decreased significantly, but it is still one of the main factors bearing failure. Appropriateness of the selection is still necessary to consider the factors bearing failure analysis.
The main task of the full complement cylindrical roller bearing failure analysis is based on a lot of background material, analysis of data and failure modes to identify the main factors that cause bearing failure, so that targeted improvement measures are proposed to extend the full complement cylindrical roller bearings length of service, the occurrence of unexpected early to avoid bearing failure.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-03062/03162 NTN | 15.875 | 41.275 | 14.681 |
| 4T-A4059+/A4138 NTN | 14.989 | 34.988 | 10.988 |