What is miniature sealed bearings?

The miniature sealed bearings refer to the metric series, the outer diameter is less than 9mm; the inch series, all kinds of bearings with the outer diameter less than 9.525mm! The main materials are carbon steel, bearing steel, stainless steel, plastic, ceramics, etc. The minimum inner diameter can be 0.6mm, and the general inner diameter is 1mm.

Among the miniature sealed bearings with ultra-small aperture, the types of miniature deep groove ball bearings include metric 68 series, 69 series, 60 series, etc., and there are 6 types of inch R series. On this basis, it can also be divided into ZZ steel plate dustproof Cover bearing series, miniature bearing series with RS rubber seal, Teflon bearing seal series and flanged rib series, etc.

miniature sealed bearings are suitable for all kinds of industrial equipment, small rotary motors and other fields with high speed and low noise, such as: office equipment, micro motors, instrumentation, laser engraving, small clocks, soft drives, pressure rotors, dental drills, hard drives Motors, stepping motors, video recorder drums, toy models, computer cooling fans, money counters, fax machines and other related fields.

Reasons for failure of miniature sealed bearings:
About 40% of the failures of miniature sealed bearings are caused by contamination by dust, dirt, debris and corrosion. Contamination is usually caused by incorrect use and poor use environment, it can also cause torque and noise problems. Miniature bearing failures caused by the environment and contamination are preventable and the cause of such failures can be determined by simple visual inspection. As long as the use and installation are reasonable, the peeling of miniature sealed bearings is easy to avoid. Erosion is characterized by indentations on the miniature ring raceway caused by shock loading or incorrect installation. Exfoliation usually occurs when the load exceeds the yield limit of the material. Erosion can also occur if installed incorrectly so that a load traverses the miniature rings. Indentations on miniature bearing rings also generate noise, vibration and additional torque.

Solution:
Because the reasons for the heating of miniature sealed bearings are different, the solutions are also different. The following are the solutions for the overheating of miniature sealed bearings:
1. Grease filling method, the so-called grease filling method is to regularly fill an appropriate amount of grease on the working surface of the bearing, which is one of the most commonly used grease lubrication methods.
2. Oil cup method, the oil cup method is to set a screw-cap oil cup or a pressure oil cup on the bearing seat, and rotate the screw cap regularly or inject grease with an oil gun. This is also a commonly used method of grease lubrication.
3. The pressure grease supply method, the pressure grease supply method relies on the grease pump to supply grease. At this time, grease with good fluidity should be used.
4. The centralized grease supply method, the centralized grease supply method supplies grease to each deep groove ball bearing and other components at the same time through the grease pump. Similarly, the grease with good flow, oxidation resistance and corrosion resistance should be selected at this time, which is also a pressure grease supply method.

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