New Product Info
NSK Greased Sealed-for-life Deep Groove Ball Bearings(Mar 28,2011)
NSK’s constant bearing improvement programme has achieved a 30% improvement in efficiency for its greased sealed-for-life deep groove ball bearings, compared to conventional ball bearings of the same size. This major saving is helping to reduce energy use in high consumption equipment as electric motors, air conditioners and domestic appliances.
The 30% improvement in efficiency is the result of a synergy of materials, design, lubrication and sealing technology. Through its developments in the materials technology for ball bearings, NSK has shown that improvements in steel cleanliness (principally reducing the number of non metallic inclusions in a steel) strongly correlates with an improved fatigue limit of bearing steel. NSK has acted upon these results, improving the steel making process and operating conditions to reduce impurities substantially, thereby achieving a decrease in oxide non-metallic inclusions. The resulting long-life steel is Z Steel, which is now the standard material for NSK’s ball bearings.
Bearings manufactured from Z Steel have a significantly extended service life when compared to conventional vacuum degassed steel: up to 1.8 times longer. In addition, Z steel also benefits from more uniform response to heat treatment, a process that ensures good hardness and excellent wear resistance.
Like new materials technology, surface optimisation plays a key role in achieving increased efficiency. However, surface optimisation goes further by reducing the energy-consuming friction that impairs efficiency and ultimately leads to wear. For a surface design to ensure reduced friction and longer bearing life, machining processes (barrelling and honing) as well as surface roughness play important roles.
A good surface geometry leads to optimum oil film formation, while the machining processes ensure good compressive stress levels and high resistance to abrasion and excessive wear.
The raceways of NSK’s ball bearings are specially honed to reduce operating friction and to reduce noise. In addition, the better lubricant distribution that results from this operation also ensures longer operating life.
Complementing the role of surface optimisation, improved bearing design, provided by a unique combination of cage and bearing balls, also contributes greatly to improved efficiency. The pressed steel cages used on NSK’s ball bearings have close coined pockets and tightly controlled clearances to reduce friction and ensure even distribution of lubricant. The balls optimise this combination with their almost perfect levels of sphericity, minimising friction with their precision surface finish. They are ground on machines designed and manufactured by NSK specifically for the purpose, hence the consistent super-precision finish that also helps the bearings deliver maximum service life.
In addition to materials technology and design, NSK has also achieved incremental improvement in the efficiency of its ball bearings with improved low torque seals and lubricants - in particular, greases. NSK’s experience with electrical motors, and the automotive industry, which has had a historic requirement for low torque bearings to ensure efficient cold starts, has proved pivotal in the lubrication area. Originally developed for use on induction motor bearings, NSK’s NS7 grease is a Polyolester diester type, which is superior in low-torque characteristics to maximise energy efficiency in the operation of ball bearings used in motors, pumps, air conditioners and compressors.
Grease, of course is retained within bearings by seals and shields, and these units also play a role in energy conservation: a seal or shield that is too tight a fit will lead to friction in a bearing and consequent energy loss. The challenge in the bearing market has been to develop high- speed seals, which minimise bearing friction.
This has led NSK to develop its V type seal. The V seal is a design innovation that seals effectively without an increase in torque or operating temperature. It has better sealing capability than a shield, and a speed capability comparable to that of a shielded bearing.
The non-contact lip of the V design reduces drag in the bearing - an important advantage where power loss is critical, as in small electrical motors.
In addition to ball bearings for general applications, NSK has also developed low torque ball bearings that help to reduce the power consumption of domestic appliances. These types of bearings have the same outside diameters and width as the global standard 608 ball bearings, but have improved internal specifications. Although the dynamic load of the new bearings is lower, this is not a problem as low torque is the main consideration. That this is achieved is evidenced by the fact that torque for these bearings is 40% to 50% lower than that of conventional bearings.
For further information, please contact Mary Fletcher:
NSK UK Ltd, Northern Road, Newark, Nottinghamshire, NG24 2JF Tel: 0500 2327464 Fax: 01636 643075 Email: info-uk@nsk.com Web: www.nskeurope.com
NSK’s constant bearing improvement programme has achieved a 30% improvement in efficiency for its greased sealed-for-life deep groove ball bearings, compared to conventional ball bearings of the same size. This major saving is helping to reduce energy use in high consumption equipment as electric motors, air conditioners and domestic appliances.
The 30% improvement in efficiency is the result of a synergy of materials, design, lubrication and sealing technology. Through its developments in the materials technology for ball bearings, NSK has shown that improvements in steel cleanliness (principally reducing the number of non metallic inclusions in a steel) strongly correlates with an improved fatigue limit of bearing steel. NSK has acted upon these results, improving the steel making process and operating conditions to reduce impurities substantially, thereby achieving a decrease in oxide non-metallic inclusions. The resulting long-life steel is Z Steel, which is now the standard material for NSK’s ball bearings.
Bearings manufactured from Z Steel have a significantly extended service life when compared to conventional vacuum degassed steel: up to 1.8 times longer. In addition, Z steel also benefits from more uniform response to heat treatment, a process that ensures good hardness and excellent wear resistance.
Like new materials technology, surface optimisation plays a key role in achieving increased efficiency. However, surface optimisation goes further by reducing the energy-consuming friction that impairs efficiency and ultimately leads to wear. For a surface design to ensure reduced friction and longer bearing life, machining processes (barrelling and honing) as well as surface roughness play important roles.
A good surface geometry leads to optimum oil film formation, while the machining processes ensure good compressive stress levels and high resistance to abrasion and excessive wear.
The raceways of NSK’s ball bearings are specially honed to reduce operating friction and to reduce noise. In addition, the better lubricant distribution that results from this operation also ensures longer operating life.
Complementing the role of surface optimisation, improved bearing design, provided by a unique combination of cage and bearing balls, also contributes greatly to improved efficiency. The pressed steel cages used on NSK’s ball bearings have close coined pockets and tightly controlled clearances to reduce friction and ensure even distribution of lubricant. The balls optimise this combination with their almost perfect levels of sphericity, minimising friction with their precision surface finish. They are ground on machines designed and manufactured by NSK specifically for the purpose, hence the consistent super-precision finish that also helps the bearings deliver maximum service life.
In addition to materials technology and design, NSK has also achieved incremental improvement in the efficiency of its ball bearings with improved low torque seals and lubricants - in particular, greases. NSK’s experience with electrical motors, and the automotive industry, which has had a historic requirement for low torque bearings to ensure efficient cold starts, has proved pivotal in the lubrication area. Originally developed for use on induction motor bearings, NSK’s NS7 grease is a Polyolester diester type, which is superior in low-torque characteristics to maximise energy efficiency in the operation of ball bearings used in motors, pumps, air conditioners and compressors.
Grease, of course is retained within bearings by seals and shields, and these units also play a role in energy conservation: a seal or shield that is too tight a fit will lead to friction in a bearing and consequent energy loss. The challenge in the bearing market has been to develop high- speed seals, which minimise bearing friction.
This has led NSK to develop its V type seal. The V seal is a design innovation that seals effectively without an increase in torque or operating temperature. It has better sealing capability than a shield, and a speed capability comparable to that of a shielded bearing.
The non-contact lip of the V design reduces drag in the bearing - an important advantage where power loss is critical, as in small electrical motors.
In addition to ball bearings for general applications, NSK has also developed low torque ball bearings that help to reduce the power consumption of domestic appliances. These types of bearings have the same outside diameters and width as the global standard 608 ball bearings, but have improved internal specifications. Although the dynamic load of the new bearings is lower, this is not a problem as low torque is the main consideration. That this is achieved is evidenced by the fact that torque for these bearings is 40% to 50% lower than that of conventional bearings.
For further information, please contact Mary Fletcher:
NSK UK Ltd, Northern Road, Newark, Nottinghamshire, NG24 2JF Tel: 0500 2327464 Fax: 01636 643075 Email: info-uk@nsk.com Web: www.nskeurope.com
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