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How to achieve optimum NSK bearing performance in gearboxes

<p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> Bearings for modern industrial drive systems must deliver efficient and reliable performance even in the most demanding of environments. <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;" align="center">   <img alt="" src="http://www.bearing.com.cn/membcentre/editor/attached/image/20190111/20190111134112_96234.jpg" /> <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;">   <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> The design of drive systems can be a complicated process as can diagnosing the cause of a power transmission failure. NSK has developed a guide to assist engineers and designers alike in this complex field. <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> Bearings used in modern industrial drive systems must meet the most demanding requirements. The range from domestic washing machines to wind turbines to mining machines is vast and each application requires a different combination of values to be met. The NSK product range varies from miniature bearings with a bore of 1mm up to rolling bearings with a diameter of 5 metres. The development of heat and seizure resistance, improved material and lubrication technology have been at the forefront of the NSK ethos. <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> Designers of industrial drive systems continue to develop new gear types and configurations so the bearing selection process must be considered as crucial in maintaining the desired performance of the drive system. <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> When selecting a suitable bearing type the special operating conditions of the respective bearing locations have to be taken into consideration, illustrated on this hypothetical example are: <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> • Full complement cylindrical roller bearing for low speed and high radial loads. <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> • Spherical roller bearings for ultra-high loads and components in an oblique arrangement. <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> • Cylindrical roller bearings for high speed and high loads. <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> • Four-point bearing, acting as the locating bearing for the high speed stage, while the cylindrical roller bearing takes the radial load.   All the determining factors need to be carefully considered in order to ensure the correct specification is produced for each application: The load, or input torque, must be determined and established as either variable or constant. The level of speed and direction of rotation need to be evaluated as well as the interaction between the load and the speed. <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> The arrangement of the shafts is a vital issue to be considered, since the requirements of a vertical configuration are very different to those for a horizontal or inclined arrangement.  This, along with any considerations for axial movement will affect the design of the lubrication and sealing systems. <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> One crucial factor is bearing life, which is mainly driven by the application itself.  NSK has developed the ABLE-Forecaster (Advanced Bearing Life Equation) which uses data from actual applications and tests, which has been accumulated over decades of work in this field, and combines it with data for lubrication systems, environmental conditions, contamination factors and material analysis. <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> The choice of materials for the construction of the bearing is also a crucial consideration in the selection process. Both the material of the bearing itself as well as any sealing materials must be carefully considered to ensure the drive system performs to the desired level.   The environment in which the bearing must perform has a major impact on the final design of the component. Exposure to dust, humidity, temperature extremes or aggressive agents must be considered, and accounted for, in the process of selecting the correct bearing. This also affects the type of lubrication that can be used – and may determine the sealing required on each component.  Lubrication has a major impact on bearing life, so great care is required to strike the right balance. <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> The method of assembly which is to be used for the drive system is an important factor in determining the bearing design; since some bespoke designs need to be assembled by hand. This is also considered alongside the maintenance requirements for the drive system, which may need to be disassembled at regular intervals. <p style="font-size:16px;border-top:0px;font-family:"border-right:0px;vertical-align:baseline;white-space:normal;word-spacing:0px;border-bottom:0px;text-transform:none;font-weight:400;color:#111111;padding-bottom:0px;font-style:normal;padding-top:0px;padding-left:0px;border-left:0px;orphans:2;widows:2;margin:0px 0px 10px;letter-spacing:normal;line-height:20px;padding-right:0px;background-color:#ffffff;text-indent:0px;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;-webkit-text-stroke-width:0px;text-decoration-style:initial;text-decoration-color:initial;"> All of the factors reviewed so far will have an impact on the costs of production and these must be balanced to ensure that benefits of improved performance and reliability can be justified for the application in question.

11 Jan,2019

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