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Bus with dozens of bearing is rolling bearing, greatly small almost include all common bearing type, of rolling bearings so bump and damage is relatively common. Because of rolling bearings are generally installed within organizations, so inconvenience intuitive check, can according to the fault phenomenon first as judge, then remove brief inspections.
Proper use of rolling bearings is to reduce bearing fault, extend the reliable guarantee of bearing life, which include the correct installation and reasonable lubrication.
Below are introduced the requirements and rolling bearing common malfunction, damage.
One, the correct use of rolling bearings
1. Bearing tear open outfit
Bearings shall be cleaned before installation. Installation, use a special tool will be ChengPing straight uniform pressure into the auxiliary, don't use hammer percussion, particularly prohibit direct in the bearing percussion. When housings with seat with loose circle holes shall, when a hole, or repair seat by replacing bearing, don't play with the bearing surface or hemp dot TongPi method reluctantly used pads. Bearings shall be removed using appropriate pull when the bearing pull out, don't use chisel, hammer percussion bearing etc.
2. The lubrication
Rolling bearing commonly used lubricant has lubricating oil or grease two kinds. When the shaft is less than 4 - the circumference of speed, or was/s car cannot use lubricating oil areas, are lubricated by grease. Grease lubrication advantages are simple structure, not sealing grease is little affected by temperature, loss, add a grease can use longer time.
Use a grease should pay attention to two questions, one is to follow your car manual request, selecting a suitable brand of grease. For example, auto water pump bearing is unfavorable choose and manufactured, because its on water resistance is poor. The second is to join bearing grease want right amount, generally only filling bearing cavity 1/2 - l / 3 advisable, excessive not only useless, also increases bearing operation, make warming heat resistance. Special attention should be paid to is auto-hub bearing, want to advocate "empty hub lubrication", that is, only in bearing of layer of the tu yi on the grease can apply, otherwise, not only wastes and heat bad, still can make a grease heated may influence to overflow, braking performance.
The advantages of lubricating oil is friction resistance small, and can heat dissipation, mainly used for high speed and working environment high temperature of the bearings. Oil's brand of car manual request according to choose, and car maintenance cycle change in time, release old oil to institutions after cleaning new oil, add again after the gas should add to the provisions, or with re-fuelling valve marking leveled (depending on automobile concrete structure, request), not more.
Second, rolling bearing common faults
Rolling bearing fault phenomena average performance is two kinds, one is bearing installed parts temperature is exorbitant, 2 it is bearing have noise during operation.
1. Bearing temperature was too high
When working in institutions, installed bearing parts are allowed to have a certain temperature, when use hand petting institutions shell, should not feel hot as normal, that high bearing temperature conversely.
Bearing the reasons are: high temperature lubricating oil quality requirements or metamorphic, lubricant viscosity too high; Agencies assembly overtighten (clearance deficiency); Bearing assembly too tightly; The circle in shaft bearing rotation; within or shell Overload; Bearing keep frame or rolling body chipped, etc.
2. Bearing noise
Rolling bearing in the work to allow a slight operation noise, if excessive or have not normal noise, the noise or crash that a failure. Bearing
Rolling bearing produce noise reasons more complex, one is bearing with inner and outer surface wear. Because the wear and destroyed bearings and shell, bearings and shaft cooperation relations, cause axis deviated from the correct position, in shaft in high-speed motion produce squeak& rattle. When bearing fatigue, its surface metal peeling, also can make bearing radial clearance increase produce squeak& rattle. In addition, bearing lubrication is insufficient, dry friction, and bearing formed broken cause abnormal, etc, will be sound. Bearing wear after desert, maintains a loose looseness damage, also can produce squeak& rattle.
Three, rolling bearing damage
Rolling bearing remove when the examination, but according to bearing damage judgment of the bearing fault and damaged reasons.
1. Groove surface metal peeling
Bearings rolling elements and inner and outer groove surface load are under periodic pulsation role, resulting in a cycle of contact stress. When the stress cycling times after up to a certain value, rolling over body or inner and outer groove work face only fatigue spalling. If bearing load is too big, can make the fatigue intensified. In addition, bearing corruptive, shaft bending, installation also can produce a groove spalling phenomena.
Bearing groove fatigue flake will reduce shaft running accuracy, make the orgnaization happening vibration and noise.
2. Bearing burns
Burns bearing its groove, roller HuoSe have back. The reason is generally lubrication burn insufficient, lubricating oil quality requirements or metamorphism, and bearing assembly too tight, etc.
3. Plastic deformation
Bearing groove and roller contact surface appear uneven pits, explain bearing produce plastic deformation. Its reason is bearing in a large static load or impact load, working surface of the local stress over material yield limit, this generally occur in low speed rotating bearing.
4. Housings circle crack
Housings circle crack reason may be bearing cooperate close, bearing foreign or inner circle loose, bearing tolerance thing, installed bearing surface deformation processing bad etc.
5. Maintains a fracture
Its reason is insufficient, crushing roller lubrication, seat ring askew, etc.
6. Maintains a metal adhesion in rolling body
The reason is probably rolling elements are stuck in a cage insufficient inside or lubrication.
7. Seat ring groove serious wear
May is a circle or inadequate, lubricating oil into foreign oil brand inappropriate.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7011CDT NSK | 55 | 90 | 18 |
| 7011ADT NSK | 55 | 90 | 18 |