Bearing for idler can not be directly investigated in the operation, but the bearing, for and idler anomalies can be observed by noise, oscillation, temperature, smoothing agent and so on. The following Xiaobian bearing for idler damage as an example, to give you a detailed account of the factors leading to bearing for idler damage, what should we do to deal with?
1, cracks have cracks in some notches
The factors are: the impact of big load of the host, bearing for idler spindle and the large amount of interference; there are considerable conflicts lead to peeling device crack; poor accuracy; inappropriate use (using a copper, card into foreign) crack and conflict.
Countermeasures: should see the use of conditions, together, set the appropriate interference and look at the material, improve the device and the use of methods to look at the smooth agent to avoid conflict cracks.
2. Metal peeling off raceway
Stripping of operation surface. After peeling, it shows a concave and convex shape. The bearing for idler rolling bodies and the inner and outer raceway surfaces are subjected to periodic pulsating load effects, and then the periodic contact stresses are changed. When the number of stress cycles reaches a certain value, fatigue peeling occurs on the rolling body or on the inner and outer raceway working surfaces. If the load of bearing for idler is too large, it will aggravate the fatigue. In addition, the bearing for idler device is not correct, the shaft is tortuous, and the raceway peeling will happen.
Countermeasures: the conditions and selection of bearing for idler and clearance should be studied from scratch, and the machining accuracy, device method, smoothing agent and smoothing method of shaft and bearing for idler box are examined.
3. Burns
Bearing for idler fever discoloration, and then burn can not rotate. The burn factors are usually smooth lack, smooth oil quality does not meet the request or change, and bearing for idler device is too tight. Other windage is too small and too large load (preload big) roller deflection.
Countermeasures: select the appropriate clearance (or increase clearance), to see the variety of smooth agent, to ensure the amount of writing, see the use of conditions, in order to prevent positioning errors, improve the bearing for idler assembly method.
4. The cage is broken
The rivet is loose or cracked, and the rolling body is broken. Its factors are: torque load is too large, smooth lack, speed changes frequently, oscillation, bearing for idler in the skew condition device, stuck into the foreign body.
Countermeasures: to find out the conditions and smooth condition is not suitable, pay attention to the use of bearing for idler, discuss the shelf selection is appropriate and bearing for idler box rigidity is not the load request.
5. Creep
The inner diameter or outer diameter surface slips, forming mirror or discoloration, and sometimes jammed. Factors include: lack of interference in cooperation, lack of sleeve fastening, abnormal heating, excessive load of main engine, etc..
Countermeasures: from the original discussion of the amount of interference is appropriate, look at the use of conditions, to see the axis and bearing for idler box accuracy.
6 rust corrosion
The appearance of partial or full rust, rolling body change line rusty. Its factors are: poor storage status, improper packaging, lack of rust inhibitor, water, acid, solvents and other invasion, directly with hand bearing for idler.
Countermeasures: to avoid rust in custody, timing from time to time oil packaging, strengthen the sealing function, regularly look smooth oil, oil quality failure or transformation should be replaced in a timely manner, to accurately use bearing for idler.
1, cracks have cracks in some notches
The factors are: the impact of big load of the host, bearing for idler spindle and the large amount of interference; there are considerable conflicts lead to peeling device crack; poor accuracy; inappropriate use (using a copper, card into foreign) crack and conflict.
Countermeasures: should see the use of conditions, together, set the appropriate interference and look at the material, improve the device and the use of methods to look at the smooth agent to avoid conflict cracks.
2. Metal peeling off raceway
Stripping of operation surface. After peeling, it shows a concave and convex shape. The bearing for idler rolling bodies and the inner and outer raceway surfaces are subjected to periodic pulsating load effects, and then the periodic contact stresses are changed. When the number of stress cycles reaches a certain value, fatigue peeling occurs on the rolling body or on the inner and outer raceway working surfaces. If the load of bearing for idler is too large, it will aggravate the fatigue. In addition, the bearing for idler device is not correct, the shaft is tortuous, and the raceway peeling will happen.
Countermeasures: the conditions and selection of bearing for idler and clearance should be studied from scratch, and the machining accuracy, device method, smoothing agent and smoothing method of shaft and bearing for idler box are examined.
3. Burns
Bearing for idler fever discoloration, and then burn can not rotate. The burn factors are usually smooth lack, smooth oil quality does not meet the request or change, and bearing for idler device is too tight. Other windage is too small and too large load (preload big) roller deflection.
Countermeasures: select the appropriate clearance (or increase clearance), to see the variety of smooth agent, to ensure the amount of writing, see the use of conditions, in order to prevent positioning errors, improve the bearing for idler assembly method.
4. The cage is broken
The rivet is loose or cracked, and the rolling body is broken. Its factors are: torque load is too large, smooth lack, speed changes frequently, oscillation, bearing for idler in the skew condition device, stuck into the foreign body.
Countermeasures: to find out the conditions and smooth condition is not suitable, pay attention to the use of bearing for idler, discuss the shelf selection is appropriate and bearing for idler box rigidity is not the load request.
5. Creep
The inner diameter or outer diameter surface slips, forming mirror or discoloration, and sometimes jammed. Factors include: lack of interference in cooperation, lack of sleeve fastening, abnormal heating, excessive load of main engine, etc..
Countermeasures: from the original discussion of the amount of interference is appropriate, look at the use of conditions, to see the axis and bearing for idler box accuracy.
6 rust corrosion
The appearance of partial or full rust, rolling body change line rusty. Its factors are: poor storage status, improper packaging, lack of rust inhibitor, water, acid, solvents and other invasion, directly with hand bearing for idler.
Countermeasures: to avoid rust in custody, timing from time to time oil packaging, strengthen the sealing function, regularly look smooth oil, oil quality failure or transformation should be replaced in a timely manner, to accurately use bearing for idler.
