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Text version of the page
| UKF Spindle Bearings Series 719, 70 USS Single Row / USO Double Row | ||||||||||||||||||||
| Experience and Development High-accuracy rotation, power, and load forces can all be fulfilled with UKF Bearings and Bearing Cartridges. Bearings are also available as Double-Row-Bearings, with application-optimised contact angle, variable pre-load, special alloy steels, and even Special Designs for particular application, all upon request. Design: Single row „USS" or Double row "USO"; made of Bearing Steel 100 Cr 6, or high strength CRONIDEX®, Steel or Ceramic balls, and self-guiding full retainers (fibre, brass). Series 719 and 70, i.e., dimension series 19 andlO, are in accordance with DIN 628-6. Series 718 available upon request. | Options Special Contact Angles, ranging from 12° to 30°, as per agreement. Bearings with integral shields -» page 26 Lubrication feed, through the outer ring, directly into the raceway -» page 26 Pre-lubricated bearings; packed with proven high-performance grease; filled with the exact quantity - so bearing is ready for installation -» page 46 Notice: the High Speed Spindle Bearings -* page 18 These are furnished with a 15s contact angle, respectively, _ 25° upon application | |||||||||||||||||||
| Double Row „USO": higher speeds, higher accuracy, easier assembly Optimum Contact Angle of 21": | ||||||||||||||||||||
| Dimensions for UKF Double Row Spindle Bearings correspond to a standard pair of Single Row Bearings in O-configuration („DB"). Double row Bearings, relative to Single bearings, have better axial running accuracy due | ||||||||||||||||||||
| Optimum 21° Contact Angle | ||||||||||||||||||||
| With an intermediate contact angle of a = 21°, these bearings achieve excellent performance advantages over the more common 15" and 25* contact angles: compared to 15°, a higher axial rigidity and axial load capacity compared to 25°, a higher Speed Limit, i.e., higher RPM. Axial Rigidity and Speed Limit, i.e., type 719 USS Ra[N/um] -I- 400 | ||||||||||||||||||||
| Best configuration foaxial load capacity anspeed limit | ||||||||||||||||||||
| to the unitized outer ring and provide higher speed limits; the one-part outer ring imparts a higher stiffness to the bearing seat, and as a Floating Bearing, yields better axial guidance. Another advantage is the central lubricant feed, and the resulting extended lubricant reserve between the bearings. Assembly is simplified with reduced parts handling, and the bearings have the proper preload set at the factory. The inner rings need only to be locked against each other. Note: Two Single Row-Bearings "70 USS 50" "DB" correspond to one Double Row-Bearing "70 USO 50". UKF bearings may also be combined to provide other configurations, for example: combining one each USS and USO can make a TBT arrangement. UKF Spindle Bearings, in general, are produced as "Universal-Bearings", so that they may readily be assembled into different bearing configurations. Consequently, this feature, combined with the optimised contact angle, a = 21°, instead of 15° or 25°, facilitates both production and spares inventories and logistics. | ||||||||||||||||||||
| -- 300 -200 igidity Advantage " 1'*® 50 | ||||||||||||||||||||
| 15 40 60 80 100 120 150 d [mm] | ||||||||||||||||||||