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Angular contact ball bearings cavitation mainly due to fuel tank and structural elements, such as strong disorder caused by a sudden change in the oil flow in the oil circulation holes forming a vacuum bubble disordered section, and then the pressure increases, the bubble burst and the resulting hole corrosion. Cavitation generally occurs in high load bearing crankshaft main bearings reduce, bearings and other fields.
Crankshaft ablation, mainly in the crankshaft journal and angular contact ball bearing lubricating film can not form an effective, making the crankshaft journal and bearing friction, due to the direct. When the engine crankshaft ablation white smoke, it emits the sound of the impact of different metals, and even cause the lock can not rotate the crankshaft bearings. Therefore, we must carry out its reasons for the failure, correct analysis and judgment.
The gap will be destroyed, a serious cause direct friction angular contact ball bearings balanced crankshaft journals and ablation caused tolerant, high-speed rotation of the crankshaft inertia force, the crankshaft journal and bearing.
Failure generally occurs after mechanical transmission million kilometers, the crankshaft journal after ablation of residual debris rebalance school inspection procedures, unbalanced, basically can say ablation balance W magazine capacity.
Angular contact ball bearings in grinding, the grinding wheel and the workpiece contact area, consume large amounts of energy, resulting in a large number of grinding heat, causing the local instantaneous grinding zone temperature. Use of linear motion heat transfer theory derivation, calculation or application infrared and thermocouple method measured the instantaneous temperature under experimental conditions can be found in the 0.1 ~ 0.001ms instantaneous temperature within the grinding zone up to 1000 ~ 1500 ℃. Such instantaneous temperature, a certain depth sufficient to work the surface layer of high temperature oxidation, amorphous structure, high-temperature tempering, secondary hardening, cracking and other changes or burns.
When using bearings, first to check the bearing surface, which can be inferred that the bearing is not loading our requirements and standards. Check the bearing surfaces should astigmatism lamp operation, to the bearing and surface cracks at the detailed examination.
First, the sound of the rolling bearing: Bearing even with slight peeling damage, the use of sound measuring device for the operation of the bearing and the size of the rolling sound quality for introspection. Also announced that abnormal tone irregular sounds, with sound measuring device can differentiate.
Normal room temperature outside of a bearing can be speculation out, bearing temperature. If the application can directly measure the bearing outer ring hole temperature is more suitable position. Mortal, bearing temperature gradually increased along with running start, 1-2 hours after arrival unchanged form. Bearing normal temperatures due to mechanical heat capacity, heat capacity, speed and load differences. If smooth, suitable for mounting portion, the abrupt increase in bearing temperature, will show an abnormally high temperature, then abort the operation necessary, bearing accepted precautionary approach needed. Because of the temperature by the smooth, speed, load, of the situation, the table values are only approximate temperature revealed that the performance limitations. The use of thermal sensors that constantly monitor the task of bearing temperature, and complete rules temperature values across the active alarm user or abort to avoid burning shaft becomes recklessly
In addition, the bearing seat ring with the bearing hole should be left between 0.2-0.5mm gap to compensate for parts processing, the error caused by mounting inaccuracy, when the central bearing ring offset operation, this gap can be ensure its automatic adjustment, avoid touching the friction to operate normally. Bearing installation accurately, its seat can automatically adapt to move the body to move, make sure to move the upper and lower raceway body is located. Angular contact ball bearings installed, it should overhaul shaft ring and the vertical axis of the center line. Otherwise, it will cause severe damage to the bearing. Method is fixed to the tank shell dial gauge face, the head of the table to touch the ring raceway of the bearing shaft upper bearing, while observing dial gauge pointer, if the pointer deflection, indicating ring and the shaft axis is not perpendicular to the center line.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7221B NSK | 105 | 190 | 36 |
| 7221A NSK | 105 | 190 | 36 |