SKF 6229EN aktuell

www.lmotion.ru skf@lmotion.ru Тел. (495)-921-34-60Preloading and stiffnessFor perfect operating behaviourunder various operating conditionsin an extremely wide range of applicationsit is necessary to establishthe suitable preload. In general, aslight to medium preload is enoughfor the majority of applications. Forspecial applications in which highshock loads and vibration can occurit is advisable to use a higher preloading.The preload classes offeredby SKF are categorised in Table 4.Selection of thepreload classIn the designs with clearance nopreloading is achieved. Instead, thereis clearance of between 1 and 10µm between the carriage and rail. Iftwo rails and more than one carriageper rail are used this clearanceis in most cases equalised by parallelismtolerances.Preload force referred to the basicdynamic load rating Cdyn of therespective carriage.Example:Carriage LLRHC 35 AC = 41 900 NPreload 0,02 x C = 838 NThis carriage is preloaded with abasic load of approx. 838N.Table 4Versions and area of applicationsT0 – ClearanceFor particularly smooth-running guide systems with low frictionand low external influences. Designs with clearance areonly available in the accuracy classes P5 and P3.T1 - Preload 0,02 CFor precise guide systems with low external load and highrequirements in respect of overall stiffness.T2 - Preload 0,08 CFor precise guide systems with high external load and highrequirements in respect of overall stiffness; also recommendedfor single-rail systems. Above-average moment loads areabsorbed without any significant elastic deformation. At onlymedium moment loads the overall stiffness is furtherimproved.T3 - Preload 0,13 CFor highly rigid guide systems such as precision machine toolsor injection mould clamping units. Above-average loads andmoments are absorbed with lowest-possible elastic deformation.Version with preload T3 only available in accuracy classesP1, P01 and P001.12