Triple row axial angular contact ball bearings

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1 Triple row angular contact ball bearings Series DKLF Heavy Series Features Bearings of series DKLF with a bore iameter of 30 mm an 40 mm are available in a Heavy series. This allows the user to achieve significant increases in screw rive performance while retaining the same nominal iameter of the threae spinle. vantages of the reay-to-fit bearings lmost twice the loa carrying capacity compare to the stanar esign with the same bore iameter Higher rigiity than conventional bearing arrangement esigns. DKLF bearings of the Heavy series permit: support of significantly higher acceleration an machining forces with the same threae spinle nominal iameter support of even higher inertia forces in vertical linear axes without weight counterbalance a significant increase in operational reliability in tensione screw rives higher quality, more precise machining ue to increase axis rigiity. This gives the user competitive avantages arising from: quicker an more prouctive linear axes in machines reuce costs ue to shorter fitting times an simpler ajacent construction esign. Preferre areas of application Bearings of the DKLF Heavy series are specially esigne for: tensione screw rives vertically arrange screw rives applications with continuous loa in the main loa irection. Market Information MI 75

2 Triple row angular contact ball bearings Series DKLF Double irection, triple row angular contact ball bearings of series DKLF consist of two rows of balls with a 60 contact angle in an O arrangement as well as an extra row of balls. This allows higher loas to be supporte in one irection only. Due to the steppe outer ring, the bearing can be easily flange mounte on the ajacent construction. The flange part of the ring has two flattene areas, which reuces the raial section height require. The bearings have contact seals on both sies an are grease lubricate for life in the majority of applications. itional sealing in the ajacent construction is not require. In most applications, the initial grease lubrication is sufficient for the whole operating life. If relubrication is necessary, however, this can be carrie out via a threae connector on the flange sie for a central lubrication system or a lubrication groove an lubrication hole through the ajacent construction. The runout tolerance is within P5 accoring to DIN 620. Heavy series The increase basic loa ratings in comparison with the stanar series (Figure 1) allow improve operational reliability in tensione screw rives. Normally, the maximum operating life of tensione screw rives is achieve only if the operating temperature correspons to the values taken as assumptions in the esign of the screw rive. Even relatively small changes in temperature have an effect on the bearing life. This is illustrate by the iagram in Figure 2. It shows, using an example calculation, the bearing life curve as a function of esign parameters such as tensioning an the anticipate operating temperature. The lower curve (DKLF stanar series) shows that the maximum achievable life of approx h for a screw rive can be reuce to h if, ue to the operating conitions, it oes not unergo heating. In such cases, the Heavy series offers significantly greater reserves. In the example calculation (upper curve), an operating life of h woul be achieve even for the most unfavourable case. Bearings of the Heavy series thus permit higher operational reliability in screw rives with a locating/locating bearing arrangement kn DKLF RS DKLF RS Basic ynamic loa rating Basic static loa rating Figure 1 Loa carrying capacity in main loa irection comparison of stanar esign/heavy series Basic rating life h K 8 Heating of spinle uring operation T DKLF RS DKLF RS Ball screw rive KGT 40 Set tension TR = 6 K Expecte heating uring operation T E = 5 K Figure 2 Influence of actual operating temperature on basic rating life L Further information on bearings of series DKLF is given in IN publication ZE an IN Technical Prouct Information TPI 100! 2

3 pplication example HSC machining centre Screw rive bearing arrangement of vertical axis In orer to increase the efficiency of machining processes base on cutting, non-prouctive operating times must be reuce further. This places high emans on the screw rive bearing arrangements in the vertical linear axes. Due to the continuously increasing acceleration capacity of the linear axes, the bearing arrangement must support not only the machining forces an the weight of the machine table but also extremely high mass inertia forces. These requirements can only be fulfille by a bearing arrangement that has extremely high rigiity an loa carrying capacity. IN esign solution The triple row angular contact ball bearing of the Heavy series reliably supports the forces acting preominantly in the main loa irection. There is therefore no nee for a larger nominal iameter of screw rive. s has been shown by the existing an proven series DKLF, the steppe outer ring suitable for flange mounting allows efect-free an rapi fitting of the bearing. Furthermore, the bearing is mounte irectly on the machine structure with a soli fitting face, giving an extremely rigi system a reliable basis for high precision machining performance. The bearing is preloae by means of a locknut of series M. IN proucts use xial angular contact ball bearing, Heavy series DKLF...2RS Precision locknut M Linear recirculating roller bearing an guieway assembly RUE a 3

4 Triple row angular contact ball bearing Series DKLF...2RS B 0, M6 H D1 0,3 =60 1 D m1 J Due to the specific esign features, these bearings must be subjecte to continuous loa in the main loa irection H B 1 DKLF...2RS ( 20 mm) Stanar esign n1 Dimension table Dimensions in mm Shaft iameter Designation Mass Dimensions Mounting imension D B 1 D 1 B 1 J 2 m 1 m 2 n 1 n 2 a 5) kg 0,010 h5 0,25 15 DKLF RS 0, ,8 50, DKLF RS 0, , ,8 54,6 31, DKLF RS 0, , , DKLF RS , ,8 56,6 56, DKLF RS 1) 2, ,8 91,8 67,2 24,6 67, DKLF RS 1, ,8 66,5 66, DKLF RS 1) 4, ,4 30,5 83, The ball cages are mae of plastic an have a permissible operating temperature of: +120 C (continuous operation). 1) Bearings of Heavy series. 2) Tightening s for the fixing screws accoring to manufacturer s recommenations. Screws to DIN 912 are not inclue in the elivery. 3) Moment of inertia for the rotating inner ring. 4) Dimension table: see page 6 an 7. Locknuts are not inclue an must be orere separately! Tightening s must be efine specially for applications with locating bearing arrangements on both sies. Data sheet for esign: see IN publication ZE. 5) Recommene minimum abutment iameter. If these values are not use, the actual bearing shouler imension 1 must be observe. 6) When imensioning the rive, the starting an the frictional at high spees, which can be 2 to 3 M RL, must be taken into consieration. 7) Guie value at 5 min 1. B IT 5 1,6 1,6 D J7 h6 a 1,6 1,6 IT 5 IT 5 B Housing Tolerance graes for shaft an housing IT 5 Shaft

5 B 0,6 45 M6 B 0, H D1 0,3 =60 1 D m1 J D1 H 0,3 =60 1 D m m 1 2 J B 1 n1 2 B 1 n1 n DKLF...2RS ( 25 mm) Stanar esign DKLF...2RS Heavy series Fixing screws DIN ) Basic loa ratings Basic loa ratings H Limiting spee 7) Frictional 6)7) Rigiity Rigiity Tilting rigiity Mass moment of inertia 3) Recommene IN locknut 4) Shaft iameter yn. C stat. C 0 yn. C stat. C 0 n G M RL C L C L C KL M M Designation grease Quantity kn kn kn kn min 1 Nm N/ m N/ m Nm/ mra kg cm 2 M , , ,278 ZM 15/33 M 15 ZM M , , ,553 ZM 20/38 M 20 ZM M , , ,12 ZM 25/45 M 25 ZM M , ,7 ZM 30/52 M 30 ZM M , ,23 M 30/65 ZM 35 M ,23 ZM 40/62 M 40 ZM M , ,32 M 40/85 ZM Ball screw rive with locating bearing arrangement on both sies

6 Precision locknuts Series M m t c øb 1 D M h Dimension table Dimensions in mm Threa Designation Mass Dimensions Set screw Further avice, sizes an fitting tools: see IN publication ZE an Fitting an maintenance manual TPI ) For bearings of Heavy series. 2) Tightening Max. permissible tightening in conjunction with aapter MS! Locknut Tightening 2) Ultimate loa Breakaway Reference tightening Mass moment of inertia D h b t 1 c m M m M m F ab M L M L M M kg H11 Nm Nm kn Nm Nm kg cm 2 Designation apter M15 1 M 15 0, M ,089 MS 20 M20 1 M 20 0, ,5 5 M ,225 MS 20 M25 1,5 M 25 0, M ,491 MS 30 M30 1,5 M 30 0, M ,86 MS 30 M 30/65 1) 0, M ,8 MS 30 M40 1,5 M 40 0, M ,26 MS 40 M 40/85 1) 0, M ,6 MS 40 m c Øb t 1 D h M 30/65, M 40/85 6

7 Precision locknuts Series ZM ZM c m D 1 0,5 h b t ZM, ZM Dimension table Dimensions in mm Threa Designation Mass Dimensions Set screw Tightening Locknut Ultimate loa Breakaway Reference tightening Mass moment of inertia D h b t 1 c m M m F ab M L M L M M kg Nm kn Nm Nm kg cm 2 M15 1 ZM 15/33 0, M ,14 M17 1 ZM 17 0, M ,401 M20 1 ZM 20/38 0, M ,297 M25 1,5 ZM 25 0, M ,157 ZM 25/45 0, M ,572 M30 1,5 ZM 30 0, M ,304 ZM 30/52 0, M ,1 M35 1,5 ZM 35 0, M ,537 M40 1,5 ZM 40/62 0, , M ,07 M45 1,5 ZM 45 0, , M ,48 Further avice, sizes an fitting tools: see IN publication ZE an Fitting an maintenance manual TPI

8 IN Wälzlager Schaeffler ohg Herzogenaurach Germany In Germany: Phone 0180 / Fax 0180 / From Other Countries: Phone +49 / 9132 / 82-0 Fax +49 /9132 / Sach-Nr /MI 75 US-D Printe in Germany

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