CARBÂ® toroidal roller bearings â a revolutionary ... - Acorn Bearings

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1 Product information 2 Recommendations 3 Product data Page ............. 3 System life Page ............. 37 Selection of bearing size To calculate bearing size or the basic rating life for a toroidal roller bearing it is possible to use all the known and standardized (ISO 281) calculation methods. However, it is recommended that the SKF Life Method be applied so that the enhanced performance of SKF bearings can be fully exploited. Detailed information can be found in the SKF General Catalogue in the section “Selection of bearing size” or in the “SKF Interactive Engineering Catalogue” available on CD-ROM or online at www.skf.com. For a self-aligning bearing system that uses an SKF Explorer spherical roller bearing and a CARB bearing, system life can be calculated using the SKF rating life equation: L nm,Sys = 9/8 where L nm,Sys L nm,SRB L nm,CARB = 1 L nm,SRB 9/8 = SKF rating life for the bearing system (at 100 – n % reliability), millions of revolutions = SKF rating life for the locating spherical roller bearing (at 100 – n % reliability), millions of revolutions SKF rating life for the nonlocating CARB toroidal roller bearing (at 100 – n % reliability), millions of revolutions 1 + 1 L nm,CARB 9/8 Longer life or downsizing When used in a self-aligning bearing system, the CARB bearing prevents internally induced axial forces from occuring. This is in contrast to conventional self-aligning bearing systems with two spherical roller bearings or self-aligning ball bearings where the induced internal axial forces can be 20 % or more of the radial load acting on the non-locating bearing. These additional forces represent a sizeable proportion of the total load that cannot be neglected and can result in • the bearing system not achieving the requisite life, or • larger bearings being used to compensate for the additional forces. Because a CARB toroidal roller bearing prevents internally induced axial forces from occuring, the load conditions in the bearing arrangement can be predicted accurately since the locating bearing is only subjected to its portion of the external radial and axial loads, while the non-locating bearing is only subjected to its portion of the radial load. Whether a spherical roller bearing (➔ diagram 1 ) or a self-aligning ball bearing (➔ diagram 2 ) is used in the locating position, the new self-aligning bearing system can substantially increase the service life of a bearing arrangement. It is also worth noting that, even if smaller bearings are used, it is often possible to achieve system lives that are longer compared to the traditional systems. This can be exploited by downsizing adjacent components and reducing costs. To take full advantage of the benefits offered by the new self-aligning system it is necessary to carefully select the bearing size – at the nonlocating as well as the locating side. For assistance, contact the SKF application engineering service. 12
1 Product information 2 Recommendations 3 Product data Page ............. 3 System life Page ............. 37 Compare the life of a conventional selfaligning bearing system with spherical roller bearings with a bearing system containing a CARB toroidal roller bearing and a spherical roller bearing Diagram 1 1 C 3148 23148 2 C 3144 23144 0,5 Relative life of the system 23148 23148 0 0 0,05 0,1 0,15* 0,2 0,25 0,3 0,35 0,4 Coefficient of friction µ * Typical value for steel on cast iron Compare the life of a conventional selfaligning bearing system with self-aligning ball bearings with a bearing system containing a CARB toroidal roller bearing and a self-aligning ball bearing 6 Diagram 2 5 C 2222 2222 4 3 Relative life of the system 2 C 2220 2220 1 2222 2222 0 0 0,05 0,1 0,15* 0,2 0,25 0,3 0,35 0,4 Coefficient of friction µ * Typical value for steel on cast iron 13
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CARBÂ® toroidal roller bearings â a revolutionary ... - Acorn Bearings

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CARBÂ® toroidal roller bearings â a revolutionary ... - Acorn Bearings