Linear Motion SKF Linear ball bearings Официальный дистрибьютор SKF в Украине компания ООО "ТД ИРБИС" Сайт: https://www.irbis.ua/ Тел.: (057)714-09-09, (044)299-58-19, (056) 787-26-00, (048) 740-93-60, (061) 280-49-45, (0542) 77-41-30, (05366) 6-80-38, (095) 640-00-53
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SKF Linear ball bearings · 2020. 9. 22. · SKF bearing companies with Linear Motion specialised sales force Linear Motion manufacturing facilities. 1 Introduction Product Overview
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Transcript
Linear Motion
SKF Linear ball bearings
Официальный дистрибьютор SKF в Украине компания ООО "ТД ИРБИС"
The SKF Group is an internationalindustrial corporation of AB SKFSweden, founded in 1907. Today,the company has some 45 000employees, runs more than 80manufacturing facilities and is oper-ating in 130 countries.
Its international network is support-ed by nearly 20 000 distributorsand retailers. SKF is the worldleader in the rolling bearing busi-ness, with bearings, seals and spe-cial steels as its main productareas. In addition, SKF manufac-tures and sells a wide range ofother industrial precision compo-nents and products.
Earlier catalogues, the data inwhich deviate from those givenhere, are rendered invalid. The rightis reserved to make changesnecessitated by technologicaldevelopments.
Catalogue n° 4182 E / XIV47173 · 1500 · 2003-08
Printed in Germanyby Weppert GmbH & Co. KG
SKF Linear Motion
A considerable share of these pre-cision products is manufacturedand sold by the SKF Linear Motiondivision. With some 700 employ-ees, the unit manufactures 3 prod-uct lines at 6 manufacturing facili-ties. One of the division’s strengthsis its distinct market orientation thatis ensured by its 11 specialisedsales companies in Europe andNorth America. In addition, theinternational SKF network guaran-tees the worldwide availability oflinear motion products and applica-tion engineering support.
The Linear Motion product rangecovers:• High-performance ball and roller
screws• Linear guidance systems• Electromechanical actuators
CD-ROM “Designer”
All Linear Motion products areavailable on this CD, as DWG andDXF files. Thanks to “Designer”,you can easily copy the requiredproduct drawing into your owndesign drawing. If you are interest-ed in obtaining a free copy of thisCD-ROM, please do not hesitate tocontact your local SKF salesorganisation.
Linear Motionspecialised companies
SKF bearing companieswith Linear Motionspecialised sales force
Linear Motion manufacturingfacilities
1
IntroductionProduct Overview 2
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Contents
LBBR linear ball bearingsLPB linear plain bearings
LBBR linear bearing units
LBC .. A linear ball bearingsLPA linear plain bearings
LBC linear bearing units
Shaft carriers
Non-driven quadro linear tables
Precision shafts 46
43
38
23
8
3
2
This catalogue covers SKF linear ballbearings, linear plain bearings andaccessories, with which it is possible toconstruct economic linear guides ofparticularly simple design for a widevariety of applications. In cases where, forexample, load conditions are such thatthese bearings and units cannot be used,other SKF linear guidance systems areavailable. Should information regardingthese other systems be required, pleasecontact SKF. The necessary informationwill be sent free of charge and withoutobligation, and a technical proposal willalso be prepared if required. This new"Linear Bearings" catalogue includeslinear ball bearings of Series 1 and 3 toISO 10285, also linear plain bearings ofthe same dimensions. Series 1 comprisesthe compact linear ball bearings LBBR aswell as linear plain bearings LPBR. Thelinear ball bearings LBBR are, in additionto the standard version, also available in acorrosion resistant version. Series 1 iscomplemented by a comprehensiverange of linear bearing units. In addition tothe single bearing units, with special shaftseals, tandem, duo and quadro units arenow included in the range. Series 3
Introduction
comprises the advanced cylindricaldesign LBCR .. A and LBCT .. A linear ballbearings as well as the self-aligning LBCD.. A and LBCF .. A varieties. The range iscomplemented by the LBHT .. A range oflinear ball bearings with extra high loadcarrying capacity.In order to keep abreast of ever increasinguser demands, SKF has fundamentallyrevised its linear ball bearings of seriesLBC (ISO series 3). The resultant newlinear ball bearings offer distinct advan-tages over the former LBC series and thelinear ball bearings currently available inthe market. A particularly important fact isthat the new ISO series 3 bearings cannow also be supplied in a corrosion-resistant standard version. Moreover, theirintegral double-lip seal permits ‘for-life’lubrication under standardoperatingconditions.
As a matter of course, the new linearball bearings are interchangeable with theformer LBC series and all linear ballbearings currently available.Also forming part of this size range arethe LPAR and LPAT linear plain bearingswhich appear for the first time in thiscatalogue. All linear bearing units are
fitted as standard with self aligning linearball bearings to accommodate misalign-ment. Other designs can be found in theappropriate tables. The range of shaftcarriers has been extended to include ashaft block conforming to the ISOstandard. Shafts, which constitute theraceway of linear ball bearings and linearplain bearings are naturally included in theSKF range of shaft guides.
This catalogue is based on currentproduction. The right is reserved to makechanges necessitated by technicaldevelopments of the products so that thebenefits can be passed on to the userwithout delay. Information from previouscatalogs is superseded by the informationcontained in this edition. In this cataloguethe units used are in accordance with theinternational Sl system.
Conditions of delivery and paymentare generally based on those ruling at thetime of delivery.Important notice SKF linear ballbearings are coated with a corrosioninhibiting preservative. Before mount-ing the bearings, they should besuitably lubricated. See also Publica-tion No. 4185E, SKF Linear guidehandbook.
Product Overview
Standardavailable from stock (changes reserved)
Non-standardPrice and delivery time on request
1) Linear bearing units without seals are available on request only.
Linear ball bearing / Linear bearing unitsDesignation ISO Serie I ISO Serie III
Compact StandardType LBBR LPBR LBCD .. A LBCF .. A LBHT .. A LBCR .. A LBCT .. A LPAR LPAT – –
Linear bearing1) LUHR LUHR PB LUCD LUCF LUCT BH LUCR LUCT LUCR PA LUCT PA – LUCTunit LUJR LUCE LUNF LUCS
LUCRLUND LUCSLUNE
LUBR LUBR PBLUER
Flanged unit1) – – LVCD – – LVCR – – LVCR –
Tandem unit1) LTBR LTCD LTCF LTCR LTCTDuo unit LTDR
LBBR Linear bearings ISO Dimension Series 1LBP Linear plain bearing ISO-Dimension Series 1LBBR linear ball bearings ........................................................................... 4LPBR linear plain bearing ........................................................................... 6
LBBR Linear bearing units ISO Dimension Series 1General ....................................................................................................... 8LUHR/LUJR single linear bearing units with closed housing .................... 10LTBR Tandem linear bearing units with closed housing ............................ 11LTDR Duo linear bearing units with closed housing .................................. 12LQBR Quadro linear bearing units with closed housing ............................ 13
LBC .. A Linear bearings ISO Dimension Series 3LPA Linear plain bearing ISO-Dimension Series 3General ....................................................................................................... 14LBCR .. A linear ball bearings, closed design non self-aligning ................ 18LBCD .. A linear ball bearings, closed design self-aligning ....................... 19LBCT .. A, LBHT .. A linear ball bearings, open design non self-aligning ...... 20LBCF .. A linear ball bearings, open design self-aligning .......................... 21LPAR, LPAT linear plain bearings, closed and open design ...................... 22
LBC Linear bearing units ISO Dimension Series 3General ....................................................................................................... 23LUCR/LUCD Linear bearing units with closed housing ............................. 26LUCS/LUCE Linear bearing units with slotted housing ............................. 27LUCT/LUCF Linear bearing units with open housing ................................ 28LUCT...BH Linear bearing units with open housingand increased load carrying capacity ........................................................ 29LUND Linear bearing units with closed housing........................................ 30LUNE Linear bearing units with slotted housing........................................ 31LUNF Linear bearing units with .................................................................. 32LVCR/LVCD Flanged linear bearing units ................................................... 33LTCD Tandem linear bearing units with closed housing ............................ 34LTCF Tandem linear bearing units with open housing ............................... 35LQCR/LQCD Quadro linear bearing units with closed housing ................ 36LQCF Quadro linear bearing units with open housing............................... 37
Non-driven quadro linear tablesGeneral ....................................................................................................... 43LZBU Quadro linear tables with closed housing ....................................... 44LZAU Quadro linear tables with open housing .......................................... 44
The recently developed compactLBBR linear ball bearing is of apatented design. The bearing com-prises a plastic cage carrying hard-ened steel raceway segments andguiding the ball sets. The bearingconforms to dimension series 1 ofISO 10285. The LBBR racewaysegments have been designed tomaximise the length of the loadcarrying zone. A high load bearingcapacity is therefore possible with aresulting long service life. The designof the plastic cage is entirely newand has been optimised. The keyfeature is that all the balls in thebearing run on the same pitch circlediameter which allows ball recircu-lation to take place smoothly with no
LBBR linear ball bearings/LPB linear plain bearings
resulting cage loads. Ball diametercan be maximised with this design ofcage with implications not only forload capacity and life but also onrunning quality.
The seal design on this newbearing type has also been improved.The sealed variant is fitted withintegral double lip seals. These sealshave an inner lip that prevents escapeof lubricant from within the bearingand an external lip to wipe the shaftsurface as the bearing moves. Theunsealed bearing is fitted with non-contacting shields that protect againstmajor contamination from the bearing.The linear ball bearings LBBR, neednot be secured axially in the housingprovided the housing bore is correct.
LBBR linear ball bearings
Stainless
The application of linear bearings hasbeen extended by this new type withthe introduction of a corrosionresistant variant Raceway segmentsand balls can be specified in highalloy stainless steel by adding thesuffix HV6 to the designation, e.g.LBBR 16-2LS/HV6. In combinationwith our stainless steel shafts, thelinear ball bearing LBBR thus offersthe possibility of realising a designcompletely of stainless steel.
5
agzahlen Gewicht Kurzeichen Appropriate special sealsNormal- mit Dimensions Designations
LPBR linear plain bearings have thesame dimensions as the LBBR linearball bearings described above. Inselecting the most suitable slidematerial (polyacetal withpolyethylene) special attention wasgiven to the stick-slip-free character-istics. Furthermore the SKF linearplain bearings require little mainte-nance and show excellent perform-ance under breakdown conditions.They have high static load carryingcapacity and are resistant to shockloads.
The use of lubricant is recom-mended after installation to allowimproved running-in even when non-lubricated operation is desired.
These bearings are intended for usein those applications where linearball bearings cannot be used due toextraordinary operating conditions.This is the case especially when thebearing arrangement is subjected toheavy shock loads or vibrations or tohigh accelerations and speeds in theunloaded state.
Under these operating conditionslinear plain bearings are the betterchoice compared with linear ballbearings, however, increased frictionmust be expected.
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Linear plain bearing LPBR Special seal
LPBR linear plain bearingsclosed designFw 12-50 mm
Dimensions Basic road ratings Mass Designation Appropriate special seals
dyn. at stat. Linear plain0,1 m/s 4 m/s bearing Dimensions Designation
Other sizes and dimensions are available on request.
* Note
The outside diameter tolerance of the linear ball bearings and linear plain bearings issuch that no additional axial location is required when the bearings are fitted into abore with a tolerance of J7 or J6.
8
Linear bearing units with LBBR linear bearings orLPB linear plain bearings
Linear bearing units incorporatingbearings of ISO series 1 are availablefor unsupported applications inclosed design.
These cost-effective bearing unitsare extremely space-saving thanks tothe compactness of the design, butthey can nevertheless accommodateloads exceeding 25 000 N (e.g.LQBR 50-2LS; see also page 13).
The new double lip seals fitted tothe LBBR bearings enable theseunits to run without relubrication,
under normal operating conditions.On special request, it is possible tobuy pre-greased bearings. Thisguarantees that the right amountof grease is inserted and that thegrease is properly distributed in thebearing.
The systems are available in thelength required by the customer. Seealso the chapter „Precision shafts“,page 46 ff. Please note that themaximum permissible angular mis-alignment is 15 minutes of arc. For
the influence on the load carryingcapacity, see diagram 9 on page 18in the technical handbook.
A corrosion resistant alternativeconsists of aluminium housings withstainless steel linear ball bearingssuch as LBBR 20-2LS/HV6 or alu-minium housings fitted with plainbearings.
For such applications the shaftsare made of stainless steel, normallyX90 CrMoV18.
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LUHR/LUJR linear bearing units
These linear bearing units consist ofa housing of extruded light alloy andthe compact LBBR linear ball bearingsor the LPBR linear plain bearings ofsimilar dimensions.
The LUHR design for shaft diam-eters from 12 to 50 mm are availablefitted as standard with LBBR linear ballbearings with or without integratedseals or with LPBR (DesignationLUHR..PB) linear plain bearings.
For severe operating conditions,notably in the presence of high levelsof contamination, the extended LUJRlinear bearing units have beenincluded in the range. These incorpo-rate LBBR linear ball bearings andtwo G type seals.
LUHR and LUJR linear bearingunits cannot be relubricated. The
Linear bearing units with LBBR linear bearings orLPB linear plain bearings
previous linear bearing units LUBRand LUER are no longer shown in thecatalogue, but are still available onrequest.
LTBR tandem linear bearing units
These comprise a one-piece ex-truded aluminium housing and twoLBBR linear ball bearings mountedone behind the other. These units arefitted with seals as standard and cannot be relubricated. They are particu-larly suitable to tables or sildes ofany width.
LTDR duo linear bearing units
The LTDR units are characterised bythe fitting of two LBBR-2LS linearball bearing units in parallel in analuminium housing. The separation
between the bearings, and the duoconfiguration permit easy fitting of alinear drive.
LQBR quadro linear bearing units
Four LBBR linear ball bearings arelocated in an aluminium housing. Theunit is sealed and the bearings arespaced sufficiently to permit thefitting of an appropriate linear drive.
Duo and quadro linear bearingunits based on LBBR linear ballbearings can be used to makecompact, simple table configura-tions. For suitable shaft blocks(LEBS), see page 41.
LTBR tandem linear bearing unit
LUJR linear bearing unit
LUHR linear bearing unit
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LUHR and LUJR linear ball bearing unitswith closed housing and LBBR linear ball bearingsFw 12-50 mm
LUHR linear bearing unit LUJR linear bearing unitwith integral double with shaft sealslip seal
Da
A
Fw
A1
C1
The previous linear bearing units LUBR and LUER are no longer shown in the catalogue, but are still available on request.For suitable shaft blocks for these bearing units, designation LSHS, see page 40 of this catalogue.
1) Linear bearing units of the LUHR design are also available fitted with LPBR linear plain bearings.Designations: e. g. LUHR 20 PB.
2) For screws with internal hexagon to DIN 912/ISO 4762.
Dimensions Basic load Mass Designationsratings
Design Linear bearing unit1)
dyn. stat. LUHR LUJR without with withFw A A1 C1 Da H H1 H2 H3 L J N2) N1
1) For 4 screws with internal hexagon to DIN 912 / ISO 4762.
LQBR Quadro linear bearing unitswith closed housing and LBBR linear ball bearingFw 12-50 mm
For suitable shaft blocks for these bearing units, designation LEBS..A, see page 41 of this catalogue.
FwDa
A
C
Bohrungsabstand J1
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In order to keep abreast of everincreasing user demands, SKF Linear-systeme GmbH has fundamentallyrevised its linear ball bearings of seriesLBC (ISO series 3).
The resultant new linear ball bear-ings offer distinct advantages over theformer LBC series and the linear ballbearings currently available in themarket. A particularly important fact isthat the new ISO series 3 bearings cannow also be supplied in a corrosion-resistant standard version. Moreover,their integral double-lip seal permits‘for-life’ lubrication understandardoperating conditions.
As a matter of course, the new linearball bearings are interchangeable withthe former LBC series and all linear ballbearings currently available. LBC .. A
LBC .. A/LBH .. A linear ball bearings · LPA linear plain bearings
linear ball bearings are available forshaft diameters from 5 to 80 mm. Theyare characterised by high load carryingcapacity. As with all SKF linear ballbearings, they are available with achoice of shields or seals. LBC .. Alinear ball bearings are, in general,designed for grease lubrication. Thecage is provided with a through-boredradial hole which permits the attach-ment of a grease nipple to providelongitudinal and axial location. Greasemay be applied direct onto the shaftthrough this hole. For the relubricationof LBHT .. A linear ball bearings de-scribed on this page, the housing mustbe provided with a grease distributionchannel in the bore. The grease is thenforced onto the raceway between theload carrying plates.
Information on the location of theseattachment holes and grease nipples isshown on pages 16 and 17 of thiscatalogue.
Stainless
The application of linear bearings hasbeen extended by this new type withthe introduction of a corrosion resistantvariant Raceway segments and ballscan be specified in high alloy stainlesssteel by adding the suffix HV6 to thedesignation, e.g. LBCR 16A-2LS/HV6.In combination with our stainless steelshafts, the linear ball bearing LBC .. Athus offers the possibility of realising adesign completely of stainless steel.
Linear ball bearingLBCR
Linear ball bearingLBHT
Linear ball bearingLBCT
Linear ball bearingLBCF
Linear ball bearingLBCD
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LBCR .. A linear ball bearings
LBCR .. A linear ball bearings com-prise a cage in which the balls areguided, together with the racewaysegments and the seals or shields.By virtue of their exceptionally longtrack length and the machinedraceway osculation they are able toaccommodate heavy loads.LBCR .. A linear ball bearings, withtheir optimised raceway segmentsand position for maximum loadcarrying capacity, can be mounted inclosed as well as adjustablehousings. When these bearings aremounted in a closed housing, thetolerance of the inscribed diameter ofthe ball set and hence the operatingclearance is determined by thetolerance of the housing bore. Whenmounted in slotted housings thelinear guides can be adjusted to theparticular application, to provideeither operating clearance or preload.LBCR .. A linear ball bearings mustbe located in axial direction.
LBCD .. A linear ball bearings
The LBCD .. A linear ball bearing is avariant of the LBCR .. A design. Themain characteristic is a self-aligningcapa-bility which allows tilting of therace way segment through an angleof+/-30 minutes of arc, thus compen-sating automatically for alignmenterrors which may be caused by in-accuracies in fitting or manufacturing(housing bore diameter) or by signifi-cant bending of unsupported shafts.The self-aligning qualities of thesebearings cannot however compen-sate for two non-parallel shafts in anassembly. Tilting of the bearing isachieved through a spherical eleva-tion ground at the centre of theraceway segment. The diameter ofthe cage is also reduced inside thehousing, so ensuring that the bear-ing- and especially the shield or seals- remains concentric with the shaft.All other characteristics of theLBCR .. A linear ball bearings are alsovalid for the self-aligning LBCD .. A
design. LBCD linear ball bearingsmust always be firmly located in theaxial direction.
LBCT .. A and LBHT .. A linear ballbearings
The open LBCT .. A and LBHT .. Alinear ball bearings differ from theLBCR .. A bearings in that a sectorhas been cut away from the cageand the shields or seals. This allowsthe shaft to be supported at severalpositions or along its whole length,so that the accuracy of guidancecannot be affected by any shaftbending.The open design of the LBCT .. Alinear ball bearings means that oneraceway is absent. The carryingcapacity in the main loading directionis however not reduced to anysignificant extent. In comparison withthe LBCT .. A design, the LBHT .. Alinear ball bearings have beenoptimised in terms of the number ofraceway segments and hence theload carrying capacity. They aresuitable for shaft diameters from 20to 50 mm. SKF LBCT .. A andLBHT .. A linear ball bearings havean important advantage comparedwith other open linear ball bearings.They are protected against contami-nants by an axial lip in the cage ateach side of the opening, which actsas a gap-type seal against the shaft.Open LBCT .. A/LBHT .. A linear ballbearings must always be located inthe axial and turning direction.
LBCF .. A linear ball bearings
For the open linear ball bearings ofthe LBCT .. A design, a self-aligningversion similar to the LBCD .. Adesign is available. Here, the designadvantages of the open LBCT .. Abearings are enhanced through theadded self-alignment capability.LBCF .. A linear ball bearings mustalways be securely located in theaxial and turning direction.
LPAR and LPAT linear plain bearings
These linear plain bearings have thesame external dimensions as thoseof the LBA/LBC Iinear ball bearings.Technical details are as shown onpage 6 under LPBR linear plainbearings. These bearings are avail-able in diameters from 5 to 80 mm(LPAR) and from 12 to 80 mm (LPAT)and do not have shields. All variants,except for LPAR 5 and 8 can berelubricated. Facilities for locationand securing are similar to those forthe LBC linear ball bearings butadditional axial locating by retainingrings necessary.
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Axial and turning stopsfor LBC .. A linear ball bearings and LPA linear plain bearings
1) All linear plain bearings of Design 22) Recommendations for holes to take grease nipples: see page 17.3) Grub screws to DIN 417 and ISO 7435 or DIN 915 and ISO 4028.4) Straight pins to DIN 7, slotted pins to DIN 1481 or grooved pins to DIN 1470 and DIN 1471.5) Grub screw to DIN 551 / ISO 4766 or DIN 913 / ISO 4026.
Design 1 Design 2
Design 3 Design 4
17
Axial and turning stopsfor LBHT .. A linear ball bearings
1) Smallest sector width for diameter Fw.For axial location and protection against relative motion see pages 16/17. Snap rings according to DIN 471.
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A comprehensive range of linearbearing units is available, based onlinear ball bearings and linear plainbearings. In addition to the basicdesign with one bearing, flangedunits can also be supplied as well astandem and quadro units.
Linear Bearing units with LBC .. A linear ball bearingsor LPA linear plain bearings
LUC linear bearing units
Units of the LUC series have castaluminium housings. Optimiseddesign with a minimum of materialresults in low weight of the productwhile maintaining high strength andstiffness. Acceleration and inertialforces are thus kept to a minimum.LUC linear bearing units are availablefor shaft diameters from 8 to 80 mm.The various designs are describedbelow in greater detail.
LUCD/LUCR linear bearing units
SKF linear bearing units of theLUCD/LUCR series offer a simplemeans of achieving economical shaftguides. The units comprise a closedhousing, a linear ball bearing ofseries LBCD .. A or LBCR .. A andare supplied as standard withshields. LUCD .. A linear bearingunits (for shaft diameters from 12 to80 mm) are normally supplied withself-aligning LBCD .. A linear ballbearings.
Linear bearing unit LTCFLinear bearing unit LQCD
Linear bearing unit LUND
Linear bearing unit LUCE
Linear bearing unit LUCF
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LUCR linear bearing units (for shaftdiameters from 12 to 80 mm) aresupplied with rigid LBCR .. A linearball bearings. A grease nipple servesto retain the bearing axially andprevent it from turning. The bearingsare thus readily relubricated. Onrequest, these units are also avail-able fitted with LPAR linear plainbearings (designation LUCR..PA).Units fitted with LBAR linear bearings(for shaft diameters 8 mm) can notbe relubricated . The bearings areaxially located in the housing boresby means of two retaining rings. Thedesignation of these units is:LUCR/LUCR .. PA.
LUCE/LUCS linear bearing units
LUCE/LUCS linear bearing units aresimilar in design to the LUCD/LUCRunits but instead of a closed housingthey have a slotted housing withadjustment screw. They can be usedfor arrangements requiring zeroclearance or preload. LUCE/LUCDlinear ball bearing units are suppliedwith selfaligning LBCD .. A linear ballbearings. LUCS/LUCR linear ballbearing units are supplied with rigidLBCR .. A linear ball bearing units.These units are not available withlinear plain bearings.
LUCF/LUCT linear bearing units
LUCF/LUCT linear bearing units aredesigned for applications where,because of heavy loads and/or longguidance lengths, the shaft must besupported either partially or along itsentire length. For this reason thehousings as well as the bearingshave one sector cut away. In all otherrespects they are similar in design tothe closed LUCD/LUCR units. Theseopen linear bearing units are avail-able as standard with the self-aligning linear ball bearing LBCF .. Aor the rigid linear ball bearingLBCT .. A. For the above-mentionedsizes, axial location is achieved bymeans of a grease nipple, conse-quently they may be relubricated.Where high load carrying capacity orlong operating life is required, LUCTunits can also be supplied fitted with
LBHT .. A linear ball bearings in sizes20 to 50 which have a particularlyhigh load rating (Designation:LUCT..BH). These units may also berelubricated. Bearing units may alsobe supplied fitted with linear plainbearings (Designation LUCT..PA).
LUN linear bearing units
LUN linear bearing units are suppliedas standard with shielded or sealedself-aligning linear ball bearings.Three versions are available: closed(LUND), adjustable (LUNE) and open,adjustable (LUNF). They are suitablefor shaft diameters from 12 to 50mm. In contrast to the LUC linearbearing unit described above, thehousings consist of an extrudedaluminium profile enveloping thelinear ball bearing along its wholelength. Two diagonally opposedattachment holes are provided. Byusing through bolts, direct fixing intothe threaded holes on the undersidecan be employed. All units may berelubricated.
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LVCD/LVCRflanged linear bearing units
LVCD and LVCR flanged linearbearing units consist of a closedflanged housing made of cast ironand fitted with a self-aligningLBCD .. A linear ball bearing (d = 12to 50 mm) respectively a rigidLBCR .. A linear ball bearing (d = 12to 80 mm). The bearings, sealed atboth sides, are located axially bymeans of pins. The flange is ma-chined on both faces thus allowingmounting on the front or rear of themachine sides. Flanged linearbearing units are not designed forrelubrication and must therefore befilled with the appropriate amount oflubricant before mounting.
LTC tandem linear bearing units
SKF tandem linear bearing unitsconsist of a solid extruded aluminiumhousing and two self-aligning linearball bearings mounted one behindthe other. A grease nipple is used tosecure each bearing in position andprevent it from turning. Tandem linearbearing units enable the constructionof linear guidance systems such astables of any required width. Thehousing may be attached to itssupporting surface from below usinghead cap screws or from above viathe two threaded holes in the hous-ing. These tandem units are availablein two versions : closed (LTCD) oropen (LTCF). These bearing units aresupplied with seals as standard. Thelinear ball bearings are supplied withone seal as standard. Shaft diametersizes range from 12 to 50 mm.
LQC quadro linear bearing units
SKF quadro linear bearing unitsconsist of a one-piece aluminiumhousing with two bores arranged inparallel, each with two self-aligninglinear ball bearings. The bearings aresealed on the external ends only. Thebearings are retained in positionaxially and also prevented fromturning. Except for units of size 8,relubrication is possible . SKF quadrounits are available in two designs:
LQCD with closed housing andLQCF with open housing. Usingquadro units, used in combinationwith LEAS tandem shaft blocks(closed design) or LRCB shaftsupports (open design) it is possibleto produce simple linear slides andtables. Details of tables are given onpages 43 to 45 of this catalogue. TheLQC design is available for shaftsizes from 8 to 50 mm. An exceptionis the size 8 unit which is fitted withLBCR 8 A-LS non self-aligning linearball bearings (full designation LQCR8 BA-2LS). LQCF units are suitablefor shaft diameters from 12 to 50mm. All quadro units may be at-tached to their supporting surfaceseither by head cap screws insertedfrom below or via the threaded holesin the housing.
NoteAll linear ball bearing unitsFw 12-50 mm can be fitted with nonself aligning linear ball bearingson request.
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LUCD linear bearing unitswith LBCD .. A linear ball bearing and closed housing, self-aligning, can be relubricatedLUCR linear bearing unitswith LBCR .. A linear ball bearing and closed housing, can be relubricatedFw 8-80 mm
Linear bearing unit LUCD designwith 2 shields
Dimensions Basic load Mass Designationsratings
Linear ball bearing unit withdyn. stat. 2 shields 2 double lip seals
LUCD/LUCR bearing units are available on request in stainless steel execution.Designation: e.g. LUCD/LUCR 20-2LS/HV6
LUCD linear ball bearing units can also be fitted with rigid linear ball bearings of type LBCR. Designation: e.g. LUCR 12-2LS.
LUCR/LUCD linear bearing units Fw 8-80 are also available fitted with linear plain bearings. Designation: e.g. LUCR 20 PA.
For suitable shaft blocks LSCS/LSNS for these bearing units, see pages 39 and 40 of this catalogue.
1) Linear ball bearings fitted to these units are secured with snap rings according to DIN 471, cannot be relubricated, not self-aligning.2) For screws with internal hexagon to DIN 912 / ISO 4762
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LUCE linear bearing unitswith LBCD .. A linear ball bearing and slotted housing, self-aligning, can be relubricated, adjustable in radial directionLUCS linear bearing unitswith LBCR .. A linear ball bearing and slotted housing, can be relubricated, adjustable in radial directionFw 8-80 mm
Linear bearing unit LUCE designwith 2 shields
Dimensions Basic load Mass Designationsratings
Linear bearing unit withdyn. stat. 2 shields 2 double lip seals
Upon request LUCE/LUCS bearing units are available in stainless steel execution.Designation: e.g. LUCE/LUCS 20-2LS/HV6
LUCE linear bearing units can also be fitted with rigid linear ball bearings of type LBCR .. A. Designation: e.g. LUCS 20-2LS.
For suitable shaft blocks LSCS/LSNS for these bearing units, see pages 39 and 40 of this catalogue.
1) Linear ball bearings fitted to these units are secured with snap rings according to DIN 471, cannot be relubricated, not self-aligning.2) For screws with internal hexagon to DIN 912 / ISO 4762.
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LUCF linear bearing unitswith LBCF .. A linear ball bearing and open housing, self-aligning, clearance adjustable, can be relubricatedLUCT linear bearing unitswith LBCT .. A linear ball bearings and open housing, clearance adjustable, can be relubricatedFw 12-80 mm
Linear bearing unit LUCF designwith 2 shields
Dimensions Basic load Mass Designationsratings
Linear bearing unit withdyn. stat. 2 shields 2 double lip
Fw A A1 C Da H H1 H2 J J1 J2 L N2) N22) E1) α C C0 seals
Upon request LVCR bearing units are available in stainless steel execution.Designation: e.g. LVCR 20-2LS/HV6
LVCR linear ball bearing units of sizes Fw 12-50 can also be fitted with linear bearings which are self-aligningDesignation: e.g. LVCD 12-2LS.
1) For screws with internal hexagon to DIN 912 / ISO 4762.2) Linear ball bearings fitted to these units are secured using pins.. to DIN 1470 or, in the case of Types 60 and 80, using retaining rings to DIN 471. They are not designed for relubrication.
34
LTCD tandem linear bearing unitswith LBCD .. A self-aligning linear ball bearings and closed housing, can be relubricatedFw 12-50 mm
Linear bearing unit LTCD . . 2LS designwith shields (Fig. 1)2)
Dimensions Basic load Ge- Designationsratings wicht Linear bearing unitdyn. stat. with double lip
Upon request LQCR/LQCD bearing units are available in stainless steel execution.Designation: e.g. LQCR/LQCD 20-2LS/HV6
For suitable shaft blocks for these bearing units, designation LEAS..A and LEAS..B, see page 41 of this catalogue.
1) Unit with LBAR8-LS linear ball bearing not designed for regreasing, non self-aligning.2) For 4 cylindrical screws with internal hexagon to DIN 912 / ISO 4762.
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LQCF quadro linear bearing unitswith LBCF .. A self-aligning linear ball bearings and open housing, can be relubricated.Fw 12-50 mm
Linear bearing unit LQCF..2LS designwith seals
1) Smallest sector width at diameter Fw.2) For 4 cylindrical screws with internal hexagon to DIN 912 / ISO 4762.
Dimensions Basic load Mass Designationsratings
Linear bearingdyn. stat. unit with double
Fw C Da H H1 H2 H3 J L L1 N2) N12) E1) α C C0 kg lip seals
Upon request LQCF bearing units are available in stainless steel execution.Designation: e.g. LQCF 20-2LS/HV6
For suitable shaft supports for these bearing units, designation LRCB.., see page 42 of this catalogue.
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Among shaft carriers, a distinction ismade between shaft blocks andshaft supports. With shaft blocks theshaft is supported only at its ends;shaft supports run for the wholelength or at least partially andtherefore require the use of openlinear bearing units.
LSCS/LSNS/LSHS shaft blocks
LSCS shaft blocks are made of castaluminium. The individual elementsgrip the shaft at the end. They aresupplied as standard with two screwholes in the shaft block base forattachment. LSCS shaft blocks aresuitable for shaft diameters from 8 to80 mm. LSNS and LSHS shaft blocksare made of extruded aluminium.Attachment is made by through bolts
Shaft carriers
or direct into the threaded holes onthe underside. LSNS and LSHS shaftblocks are available for shaft ofdiameter 12 to 50 mm.
LEBS/LEAS tandem shaft blocks
To match the duo and quadro linearbearing units with linear ball bearingsLBB of Series 1, LEBS tandem shaftblocks are available in the A design(i.e. fixed shaft blocks, linear bearingunit axially moveable). LEBS shaftblocks are available for shafts ofdiameter 12 to 50 mm. For units withlinear ball bearings LBC/LBH ofSeries 3, LEAS tandem shaft blocksare available in A and B design. TheB design allows axial movement ofthe shafts through a fixed linearbearing unit. LEAS shaft blocks are
available for shafts of diameter 8 to50 mm.
LRCB/LRCC shaft supports
For heavily loaded linear bearingunits and/or long track lengths,allowance must often be made for ahigh degree of bending of the shaft.In such cases continuous or at leastpartial support of the shaft is calledfor, with the use of open linearbearing units. SKF offers shaftsupports for shaft diameters from 12to 80 mm of the LRCB (with holesalready drilled) and LRCC types(without holes).
8 12 12,5 23 11 22 16 15 52 65 32 5,5 M 5 0,04 0,04 LEAS 8 A LEAS 8 B12 14 18 32 14 28 23,5 19,5 70 85 42 6,6 M 6 0,09 0,07 LEAS 12 A LEAS 12 B16 18 20 36 17 34 26,5 23,5 82 100 54 9 M 8 0,14 0,13 LEAS 16 A LEAS 16 B20 20 25 46 21 42 32,5 28,5 108 130 72 11 M 10 0,25 0,22 LEAS 20 A LEAS 20 B25 25 30 56 26 52 40 36 132 160 88 13,5 M 12 0,47 0,44 LEAS 25 A LEAS 25 B30 25 35 64 29 58 48 42 150 180 96 13,5 M 12 0,62 0,56 LEAS 30 A LEAS 30 B40 30 44 80 36 72 59 51 190 230 122 17,5 M 16 1,15 1,00 LEAS 40 A LEAS 40 B50 30 52 96 44 88 75 67 240 280 152 17,5 M 16 1,70 1,52 LEAS 50 A LEAS 50 B
A design B design
1) For screws with internal hexagon to DIN 912 / ISO 4762.
Attention:
LEBS Tandem Shaft Blocks can be installed only in conjunction with the LBB Compact Series (page 4 to 13)!
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LRCB/LRCC shaft supportsd 12-80 mm
1) For screws with internal hexagon to DIN 912 / ISO 4762 without spring washers.2) For screws with internal hexagon to DIN 912 / ISO 4762 with spring washers to DIN 7980.
The closed LZBU quadro-linear tableconsists of a closed quadro linearbearing unit, two tandem shaft blocksand two shafts of the required length.The bearing unit is fitted with fourLBCD .. A-LS self-aligning linear ballbearings each sealed on one side. TheLZBU .. A design permits axial move-ment of the linear bearing unit, i.e. theshafts are fixed, to the machine bedvia the LEAS..A shaft blocks. TheLZBU..B design is provided withLEAS..B shaft blocks. This combina-tion allows the shafts to travel with theshaft blocks in applications where thelinear bearing unit is fixed.
LZBU quadro-linear tables can besupplied in sizes 8 to 50 mm. Size 8
tables are however not self-aligningand they are not designed forrelubrication.
The description of the closedquadro-linear tables also applies tothe combination of LQBR..2LSquadro-linear bearing units of Series1 with twin LEBS tandem shaftblocks and shafts with a diameter of12 to 50 mm.
LZAU quadro-linear tables
The open LZAU quadro-linearcomprises the open quadro-linearunit and two high precision shaftswith shaft supports. The bearing unitis fitted with four LBCF .. A-LS selfaligning linear ball bearings, eachsealed at one side. The standard
lengths of these tables is dictated bythe pitch of the attachment holes inthe LRCB shaft supports. The totallength should always be a multiple ofthis distance.
LZAU quadro-linear tables areavailable in sizes 12 to 50 mm.
LZBU quadro-linear table
LZAU quadro-linear table
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LZBU/LZAU quadro-linear tables non-drivend 8-50 mm
Dimensions
Linear table Linear bearing unit with self-aligning Shaft blocklinear ball bearings
d HRA HRB HT L13) L2 H H1 H2 H3 H5 H6 H7 J2 N4) N1
4) A HA HB H1A H1B±0,03 ±0,03 ±0,03 ±0,01 ±0,015 ±0,015
Design LZBU..A with closed Design LZBU..B with closedlinear bearing unit linear bearing unit
1) The designation for an LZBU quadro-linear table with shaft diameter 20 mm, total length 1200 mm, tandem shaftblocks type A and quadro linear bearing unit, for instance, is LZBU 20 A-LS x 1200. Delivered as a kit of parts.
2) The designation for an LZAU quadro-linear table with shaft diameter 20 mm, total length 600 mm and quadro linearbearing unit, for instance, is LZAU 20-2LS x 600. Delivered with shafts and shaft supports ready assembled.
3) Any fixed length up to L1 is available for LZBU quadro-linear slides. Longer lengths are available to order. Lengthtolerance of shafts is to DIN 7168 coarse series.
4) Suitable screws with internal hexagon to DIN 912 / ISO 4762.5) The separation is always arranged symmetrically to half the table length.6) Valid only for even loading of all four LBC .. A linear ball bearings.7) Units fitted with LBCR .. A linear ball bearings are not designed for relubrication and are non self-aligning.
SKF precision shafts can be suppliedeither as solid or hollow shafts. Thesolid shafts are available in alldimensions required to fit SKF linearball bearings; the hollow shafts havea minimum outer diameter of 16 mm.They are induction hardened andground (see table on next page).
SKF shafts have exceptionallyhigh dimensional stability and longservice life. The only exception tothis is at the end of shafts of normalproduction length deviations inhardness and dimensional stabilitycan occur.
For special applications, solidshafts of stainless steel or hardchromium plated shafts having achromium layer of approximately 10µm thickness can be supplied. Whenusing stainless steel shafts, it shouldbe remembered that the surface isnot as hard as that of shafts made of
high grade steel. The case depthmay also be greater than indicated inthe table and this may have aninfluence on the machinability of theshafts.
Because of the benefits theyoffer, SKF precision shafts are notonly used together with SKF linearball bearings for linear guides, butare also use for other purposes, forinstance axles or column sleeves.
Materials
SKF precision shafts are made fromthe non-alloyed high-grade steels Cf53(Material No.1.1213), Ck53 (MaterialNo.1.1210), Ck60 (Material No.1.1221)and 100Cr6 (Material No.12067).The surface hardness is betweenapproximately 60 and 64 HRC. Thesolid shafts of stainless steel aremade from the steel X9OCrMoV18
(Material No.1.4112) or X46Cr13(Material No.1.4034). In this casethe surface hardness lies betweenapproximately 52 and 56 HRC.Shafts made from other materialscan be supplied to special order.
Surface finish
All SKF precision steel shafts ofhardenable steel have a surfaceroughness of max. 0,3 µm Ra (DIN4768, Part 1).
SKF precision steel shafts are available as standard with a diametermachined to tolerance h6 or h7. Theaccuracy of dimensions and form ofthese shafts will be found in the tableon page 51. There may be slightdeviations from the values given inthe tables for sections of shaft whichare soft annealed. SKF precisionsteel shafts with diameters machinedto tolerance h9 can be supplied tospecial order. Shafts cut to speciallengths have a length tolerance toDIN 7168 “medium”. The relevantvalues are given in the adjacenttable.
Shafts with radial holes
For linear guides requiring support,shafts with threaded radial holes areneeded. These can be supplied bySKF. The radial holes may be eitherpositioned to fit SKF shaft supportsor as specified on customer’s owndrawings. It is however recom-mended that the guideline valuesgiven in the adjacent table for threadsize and depth be followed. SKFshafts with radial holes are not softannealed at the drilling position; thethread is out in the hardened andground shaft. By this means changesin hardness and accuracy of the shaftare avoided.
Composite shafts
Composite shafts can be supplied tocustomer drawings, either withscrewed joints (see illustrations,page 48) or with ‘plug and socket’joints, depending on the application.Accurately centred trunnions andsockets guarantee smooth transi-tions at the butt joint. To ensurecorrect assembly, the relative posi-tions of the shaft sections and of theshaft ends are marked. Compositeshafts should be fastened to asupport at the butt joints, particularlywhen these are of the ‘plug andsocket’ type. The radial holes shouldalso be positioned as close aspossible to the joint and the length ofthe shaft be chosen so that anybending of the shaft will not cause agap to be formed at the joint.
Length tolerances for shafts toDIN 7168, medium seriesNominallength Deviationover incl
mm mm
— 120 ± 0,3120 400 ± 0,5400 1000 ± 0,8
1000 2000 ± 1,22000 4000 ± 24000 8000 ± 3
Corrosion protection, packing
SKF precision steel shafts are treatedwith a rust inhibiting preservativewhich must be removed before theshafts are installed. All shafts areindividually packaged. Depending onsize and quantity they are supplied incardboard or wooden boxes whichoffer maximum protection duringtransport.
Standard length of the shaftsSKF precision steel shafts are available in following length
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ESSC Shafting standard
ESSC 1cut with no chamfer onlydeburr• length tolerance
according DIN 7168middle range(see page 47)
ESSC 2cut with chamfer• length tolerance
as ESSC 1
ESSC 4cut with machined 25°chamfer, 90° front surfacesand one axial hole• length tolerance as
ESSC 3
ESSC 3cut with machined 25°chamfer and 90° frontsurfaces for limited lenghttolerance or chamferaccording to customerspecification• length tolerance +/- 0,1 mm
ESSC 10shaft according to customer specification• drawing is obligatory of manufacturing
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Attention:d1 can deviate from the value quoted. Please enquire if necessary.Different shaft diameters and types on request.The static load capacity has to be decreased by 8% and the dynamic load capacity by 18% when using the nonrustingtypes (HV6) in conjunction with precision steel shafts made of stainless steel.
Dimension Mass Moment of Cross sectional Designationsinertia area Solid shafts of Solid shafts of stainless Solid shafts Hollow shaft
Solid Hollow Solid Hollow Solid Hollow precision steel with high grade high gradeshaft shaft shaft shaft shaft shaft steel X90CrMoV18 X46Cr13 steel hard steel
Standard designsDesigns for fixed lengths Designs for fixed lengthwithout chamfer with chamfer
Shafts cut to special length with flat turned ends. The length tolerance of these shafts corresponds to DIN 7168,medium. The designation for a shaft with 20 mm diameter cut to a length of 1,5 m is, for example, LJM 20x1500.
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Precision shafts of high-grade steeld 5-80 mm
1) Shafts with straightness 50 µm/1000 mm to order
Shaft Accuracy of dimension and formNominal Shafts to tolerance h6 Shafts to tolerance h7diameter Diameter Circula- Cylindri- Straight- Diameter Circula- Cylindri- Straight
deviation rity city ness1) deviation rity city ness1)
SKF SOUTH EAST ASIA &PACIFIC PTE. LTD.153 Gul Circle JurongSingapore 629610Postal Address:Jurong Point P. O. Box 445SINGAPORE 916415Phone: + 65 - 8 61 69 22Fax: + 65 - 8 61 10 11
SKF MOTION TECHNOLOGIES1530 Valley Center ParkwayUSA-BETHLEHEM, PA 18017Phone: + 1 (610) 861 - 4800Fax: + 1 (610) 861 - 4811
Linear Motion
Linear Motion
SKF Guiding Systems SKF Ball & Roller Screws SKF Actuators
http://www.linearmotion.skf.com
SKF Linear Motion offers a wide range of precision engineered linear motion components, units and systems.In addition to comprehensive product literature and software, SKF offers assistance from experienced linear motion engineers.Linear Motion has 3 product lines and a sales organisation based on 11 specialized sales companies located in Europe, Japan and in the USA.However the product availability as well as the product application is world-wide granted by the SKF Bearing international network.To get any other SKF address all over the world, please contact one of the companies below.