S V Hi-Tech Bearing (India) Private Limited

A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races.

The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It achieves this by using at least two races to contain the balls and transmit the loads through the balls. In most applications, one race is stationary and the other is attached to the rotating assembly (e.g., a hub or shaft). As one of the bearing races rotates it causes the balls to rotate as well. Because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other.

Ball bearings tend to have lower load capacity for their size than other kinds of rolling-element bearings due to the smaller contact area between the balls and races. However, they can tolerate some misalignment of the inner and outer races.

SKF Spectraseal profiles are predominately used for extreme and demanding application requirements where conventional moulded elastomers or thermoplastics cannot be used due to material limitations. Application conditions such as:

• Extreme temperatures: from cryogenics temperatures to +290°C (+550°F)
• Low friction: friction sensitive application such as valves or pressure switches that are required to operate with a very light spring load or pressure differential
• Presence of aggressive chemicals: most of the engineered plastic materials used, such as PTFE based compounds, have virtually universal media compatibility
• High-pressure gas: most engineered plastic materials do not exhibit explosive decompression, which is a common problem for many elastomer-based materials
• Abrasive or non-lubricated environment: media such as water, paints, resins and drilling mud can be very abrasive to elastomer based sealing materials
• High surface speeds and or pressures: Due to the low friction characteristics of the materials it is possible to tolerate high surface speeds even without lubrication

Split spherical roller bearings are principally used where the replacement of unsplit spherical roller bearings would require costly additional work, such as the removal of gears and couplings, the dismounting of drives or the dismantling of shaft power trains.

The use of split spherical roller bearings shortens the downtime of machinery and plant when replacing bearings and the costs involved in bearing replacement are massively reduced. In new designs too, split spherical roller bearings can give considerable cost savings in many cases, since the plant can be simplified and the assembly work required is reduced.