Different characteristics of special bearings for vibration and ordinary bearings
Design structure
Special bearings for vibration:
A. The diameter of the rolling element is increased, and the length of the rolling element is increased. B. The cage guides the rollers from the outer ring ribs to reduce the force on the rollers. C. Use the inner ring rib to guide the roller to improve the roller operation. D. The cylindrical roller bearing cage adopts a monolithic structure and the strength is greatly improved. E. The outer diameter of the self-aligning bearing is designed with oil groove and oil hole, and the lubrication effect is good.
Ordinary bearing:
A. The roller body diameter and the rolling element length are both small. B. The cage has a roller or inner ring guide. C. Cylindrical roller bearing cage adopts rivet structure, which is easy to loosen and cover. D. The outer diameter of the self-aligning bearing has no oil groove oil hole, and the lubrication effect is poor.
2. Selection of materials
Special bearings for vibration:
A. The inner and outer rings and rolling elements are vacuum degassed bearing steel, which has good fatigue resistance. B. The cage is made of aluminum-iron-manganese bronze material with high strength, good elasticity and better wear resistance.
Ordinary bearing:
A. The inner and outer rings and the rolling elements are made of ordinary bearing steel. B. The cage is made of zinc brass with low strength and poor elasticity.
3. Heat treatment method
Special bearings for vibration:
A. The inner and outer rings are made of shell-mamming quenching or martensitic quenching + high temperature tempering, with uniform hardness and small internal stress; good toughness, impact resistance and vibration. B. When working within 150C temperature, the stability is good.
Ordinary bearing:
The inner and outer rings adopt ordinary quenching method, which has poor toughness, poor impact resistance and vibration performance, and poor thermal stability.
4. Tolerance and manufacturing process
Special bearings for vibration:
A. It is manufactured strictly according to the P6 precision standard, especially the tolerance of inner and outer diameter is very small. B. The rolling element dimensions are different from each other ≤ 0.002. C. The outer diameter of the cylindrical roller has a convexity to avoid stress concentration. D. The rolling surface is super-finely processed and has a high finish. Ordinary bearing:
A. Ordinary PO-level precision tolerance (partial P6 standard) manufacturing. B. Rolling body grouping ≤ 0.005. C. Cylindrical roller without convexity practice. D. Part of the raceway is only polished, and the finish is low.
5. Internal clearance
Special bearings for vibration:
The clearance is produced according to the requirements of the vibration machine, and the range is controlled within a small range with good consistency.
Ordinary bearing:
The play is generally produced according to the standard group or the C3 group, the play is small, or the range is large, and the dispersion is large.
6. Use effect
Special bearings for vibration:
Low noise, low temperature rise, good stability, long service life and no early fatigue.
Ordinary bearing:
High noise, high temperature, poor stability, short service life, early fatigue
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