Bearing is the machine element used in between rotating & sliding elements to minimise friction.
Angular Contact Ball Bearing
Deep Groove Ball Bearing
Four Point Contact Bearing
Magneto Ball Bearing
Miniature Ball Bearing
Self Aligning Ball Bearing
Thrust Ball Bearing
What are the types of Roller Bearing ?
- Cylindrical Roller Bearing
- Tapered Roller Bearing
- Spherical Roller Bearing
- Crossed Roller Bearing
- Needle Roller Bearing
“Z” is a designation which means a steel shield covering the one side of the bearing (for most brands). “ZZ” means that the bearing has a shield on both sides.
Normally, the shield itself will be branded as “608 Z” even though there is a shield on both sides of the bearing. This is for practicality in manufacturing. It is much more economical to produce all the shields stamped as “608 Z” than it would be to manufacture the exact same component with two different stampings on them.
Torque or drag is lower with a shield than with a seal. Alternately, the seal provides a higher degree of protection from contamination. Shields and Seals are available in a variety of materials and configurations.
By use of a ‘Labyrinth Seal’
The Labyrinth Seal is a non-contact seal with special internal construction which centrifuges dirt back out to where it came.
Labyrinth seals are formed by interdigitated segments attached to the shaft & housing that are separated by a very small gap. They are particularly suitable for preventing oil leakage from the shaft at high speeds.
The retainer (also called cage or separator) is used to separate the balls and equally position them around the bearing raceway. Some retainer materials contain lubricant for extended bearing life.
Retainers for Ball Bearings are generally available in two designs. The most universal is a 2-Piece Closed Ball Pocket design called a ‘Ribbon Retainer.’ A Single Piece Open Ball Pocket design is called a ‘Crown Retainer.’ Crown Retainers are available in a variety of metal and nonmetal options. Phenolic Retainers are excellent options for high-speed applications.
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Lowest to Highest
- ABEC 1 = ISO P0
- ABEC 3 = ISO P6
- ABEC 5 = ISO P5
- ABEC 7 = ISO P4
- ABEC 9 = ISO P2
The Annular Bearing Engineers Committee (ABEC) of the American Bearing Manufacturers Association (ABMA) establishes standards for manufacturing precision ball bearings. These standards are also accepted by American Standardization Institute (ANSI) and by international agreement for the standards developed by the International Standards Organization (ISO).
The ABEC and ISO bearing standards primarily define dimensions & tolerances for the bearings. These standards do not define many other aspects of the bearing such as lube, radial play, ball complement, retainer type, torque, cleanliness, etc.
- To maintain the bearings in exact position both radially and axially and to maintain the running accuracy of the shaft.
- To increase bearing rigidity.
- To minimise noise due to axial vibration and resonance.
- To prevent sliding between the rolling elements and raceways due to gyroscpic moments.
- To maintain the rolling elements in their proper position with the bearing rings.
- Keep Bearings and Surrounding Area Clean (to prevent the entry of dust and dirt)
- Handle Bearings Carefully, do not use bare hands while handling (do not apply heavy shocks)
- Use Proper Tools (do not use general-purpose tools)
- Prevent Corrosion (prevent rusting of bearing caused by moisture and corrosive gasses)
- Open the bearings from packing at the time of mounting.
- To reduce friction & wear
- To extend fatigue life of the bearing
- To prevents corrosion and extends shelf life.
- To provide protection from foreign material entering the rolling elements.
- To reduce noise level of the bearing, lowers torque, and assists the bearing in reaching maximum operating speed.
- To dissipate frictional heat
Most standard Lithium-based solutions are not designed for high temperatures. Most standard greases will operate consistently at a maximum temperature of 80°C and can withstand brief periods at 110°C.
If your application goes higher than this then you need a more specialised lubricant. If your application goes beyond 350°C then you may need to consider solid lubricants or ceramic bearing materials (or a combination) or consult with manufacturer.
- Smoother running bearing
- Less vibration and noise
- Reduced centrifugal loads as the balls spin against the outer ring, due to lighter weight ceramic balls.
- Increased bearing life Lower bearing temperatures at high rotational speeds
- Reduced lubrication requirements