Usually the bearing and the shaft are used together, the inner sleeve of the bearing is mounted with the shaft and the bearing jacket is mounted with the bearing housing. If the inner sleeve turns with the shaft, the inner sleeve adopts a close fit with the shaft and the bearing jacket adopts a clearance fit with the bearing body; conversely, if the bearing body turns with the bearing jacket, the bearing jacket adopts a close fit with the bearing body and the bearing inner sleeve adopts a clearance fit with the shaft. In the process of operation often occur running circle failure, which requires analysis and processing, otherwise it will cause accidents, resulting in greater losses.
Improper fit:
Bearing run-around is a common failure, and the reasons for run-around are also multifaceted. First of all, the improper fit, we know that the running bearing will produce heat, shaft and inner sleeve, jacket and bearing body there is a temperature difference, these temperature differences will cause changes in the fit tightness, if the size of the inner sleeve of the closely matched bearing is larger than the outer diameter of the shaft, with the extension of time, it will produce wear, running circle is inevitable, it will send more heat, the temperature of the bearing body will also rise, once the bearing body expansion Once the expansion of the bearing body, bearing clearance disappears, bearing inside and outside the jacket that is one, with the shaft, then the bearing jacket that is in the bearing body to do rotational movement, and generate a lot of heat, the accident occurred, the bearing body of the inner hole is also worn large. This is the temperature difference formed due to improper fit tightening caused by the running circle.
Vibration caused by the running circle:
The second is the vibration caused by the running circle, if the equipment vibration is larger, bearing and bearing by the greater the East load, the shaft in operation as if being knocked, over time, the shaft will be whacked extension, journal thinning, which destroys the original with the elasticity, the formation of micro-motion, heat, running circle conditions, journal will be worn fine, bearing body bore will be worn large.
Lubrication failure:
Lubrication failure, friction generated more heat, bearing inner jacket, bearing body temperature difference, destruction of the original fit size, bearing journal, bearing body wear.
Improper selection of lubricant:
Fourth, improper selection of lubricant or even more impurities. When the grease hardness is very large or impurities, it will cause a weir effect to the bearing rolling body, preventing the own rotation of the rolling body, generating friction heat, but also drive the jacket in the bearing body of choice, resulting in wear, when the resistance is large, this resistance can overcome the bearing inner sleeve and shaft friction, making the shaft and inner sleeve slippage, resulting in sliding, causing wear.
Improper installation:
Said improper installation mainly refers to, for example, bearing heating temperature is too high, bearing expansion, the size can not be collected; shaft free end bearing remaining clearance is not enough, resulting in bearing side friction heat; bearing, shaft, bearing body cleaning is not clean, resulting in stalling; split bearing seat fit mouth flattening bearing, resulting in bearing local stalling and other undesirable conditions, these conditions will cause bearing heat, resulting in bearing run ring.
Long-term vibration and knocking:
Six, long-term vibration knocking, will make the shaft side of the fatigue spalling, once the debris discharge, is bound to cause loosening, resulting in bearing run ring.
Bearing failure:
Long-term bearing operation of the bearing, the raceway will produce point fatigue pitting, shedding debris will produce a hitting weir effect, once the heat, while generating temperature difference, will cause running circle.
Post time: Dec-03-2022