TRASCO ES: 0 Backlash Coupling

Transcription

1 RO : 0 Backlash oupling RO

2 RO : 0 backlash coupling he main design funcion of he RO coupling is o ransmi moion while absorbing misalignmens and vibraions wih absolue precision and wihou any backlash whasoever. he very compac design makes i a very raional and funcional device. Descripion he RO consiss of wo hubs, which are eiher made of high-srengh aluminum (up o he 38/45 size) or seel (from size 42) ha are conneced wih an elasic elemen. he hubs are obained by an accurae machining in order o achieve exremely precise dimensional characerisics. he elasic elemen, which is made of special polyurehane was developed afer considerable research and laboraory esing, is press-formed by a process which guaranees a high degree of dimensional accuracy. he elemen is available in 4 differen hardnesses: 80 h. (blue), 92 h. (yellow), 98 h. (red), 64 h. D (green). oupling performance depends on he ype of elemen seleced (see echnical characerisics ). Oher elemen hardnesses are available upon reques o mee special operaing condiions, such as high emperaures and/or high orques, and for providing a high degree of vibraion dampening capabiliy. lease conac our ngineering Office for help in selecing he appropriae elemen hardness. pider ub RO Operaion When he polyurehane elemen is insalled in is special seas beween he hubs, i becomes precompressed, hereby providing he zero backlash feaure which characerizes he ransmission performance of his coupling. Wih zero backlash, he coupling remains orsionally rigid wihin he range of he precompression load, bu does permi he absorpion of radial, angular, and axial misalignmens as well as undesired vibraions. he significanly wide precompressed area of he flexible elemen keeps he conac pressure agains he elasic elemen low. herefore, he elemen eeh can be overloaded many imes wihou undergoing any wear or aking a permanen se. rasco couplings (037.05)

3 dvanages he RO coupling provides he following advanages: zero-backlash moion ransmission dampening (up o 80%) of vibraions from moor shaf low hea and elecrical conduciviy easy and fas insallaion perfec balance ( & ype) low momen of ineria (due o compac design and ypes of maerials used). ain applicaions RO couplings are mos frequenly used wih: servomoors roboics sliding ables spindle conrols for drilling and grinding mandrels ball-bearing screws Operaing emperaure Range he operaing emperaure range for he RO depends on he ype of elemen. For he 92 h. (yellow), he range is beween -40 and +90, and for he 98 h. (red), he range is beween -30 and +90. eak emperaures as high as 20 can be oleraed for brief insances. igh operaing emperaures can cause he elasic elemen o lose a considerable amoun of elasiciy, hus subsanially lowering he capaciy as regards orque. herefore, when selecing a coupling, he operaing emperaure mus be carefully considered (see echnical characerisics ). X 94/9/ compliance is possibile o ask for specific cerificaion for use in hazardous area according o sandard 94/9/. RO couplings are available wih specific mouning/operaing insrucion manual and conformiy. For informaion, please conac our echnical office. [ ] orsion angle [rad] 2 rasco couplings (037.05)

4 RO execuions G F execuion G execuion ub execuion wih finish bore, keyway and sopscrew. o suiable for backlash free drives wih heavy inversions or high sar up frequency. lamping hub execuion wih single slo wihou keyway. Up o size 9/24. Backlash free hub design. ransmissible orque depends on bore diameer. G execuion G... execuion lamping hub execuion wih double slo wihou keyway. From size 24/28. Backlash free hub design. ransmissible orque depends on bore diameer. amping hub execuion wih single slo and keyway. Up o size 9/24. he camping pressure eliminaes backlash in orque inversions. RO G... execuion amping hub execuion wih double slo and keyway. From size 24/28. he camping pressure eliminae backlash in orque inversions. G 2 execuion pli camping hub execuion for radial assembly of he coupling orque depends on bore diameer. xecuion wih keyway, as opion can be delivered for a posiive orque ransmission wih zero backlash. hese execuions are suiable for double cardanic applicaions. G execuion G execuion xecuion wih locking ring. his execuion is suiable for high speed and high orque. crews mouning from spider side. ransmissible orque depend on bore diameer. xecuion wih locking ring wih high machining accuracy: design suiable for applicaion on spindles according o D rasco couplings (037.05) 3

5 andard ype he hubs of he sandard coupling ype can be eiher solid or have a finished bore, he diameer of which corresponds o any one of he sandard shaf diameers. he grubscrew(s) is (are) locaed 80 from he key sea - ex. 02 (20 each oher - ex. 0). Boh he solid hub and bored hub coupling are generally available from sock for quick delivery. 20 Ø G Ø Ø Ø G Fig.3 Fig. Fig. 2 F min F max ub W [kg] J [kgm 2 ] nmax [min - ] UU UB ,003 0,085 x ,009 0,49 x ,020 2,8 x / ,066 20,4 x / ,32 50,8 x / , ,3 x / , ,6 x UB , x , x , x , x G c UU UB , ,5 20 7, , , , ,0 3, , ,5 5, ,0 5, UB ,0 5, , , ,5 8, Fig. Bore olerance: 7 - J9 (D 6985/) keyway Order form G 24/28 G F 24/28 F 20 24/28 R RO hub olid hub RO hub Bore + keyway + se-screw Bore pider and spider colour (R = red, G = yellow, ec...) W Weigh kg J omen of ineria kgm 2 n max aximum rpm min - 4 rasco couplings (037.05)

6 execuion wih clamp hubs his ype of coupling permis quick, sure fixing, wihou any shaf-hub backlash. Wih he keyless coupling ype, he orque applied for ighening down he screws (s) mus be as given in he able. he coupling ype is available wih or wihou keyway. Ø Ø Ø G Ø G Ø Ø G Ø Fig. Fig.6 Fig.6 f f Fig. 2 Fig.7 f RO F min F max f [m] ub W [kg] J [kgm 2 ] nmax [min - ] Keyway posiion G Fig. UU UB ,35 0,003 0,085 x ,5 0,75 0,007 0,42 x ,4 0,08 2,6 x / ,07 8, x / ,56 74,9 x / ,240 63,9 x / , ,5 x UB , x , x , x , x From size 7 o 9/24: single slo execuion UU UB , ,0-20 7, , , , ,5 2 5,5 32, ,0 3,5 2 45, , , ,5 5,2 3,5 72, ,0 5,6 6 83,3 2 UB ,0 5, , / 2 2/ 3, , , , ,5 8,3 27,5 39,0 2 From size 24/28 o 65: double slo execuion Using hub execuion wihou keyway, he maximum ransmissible orque is he minor beween he clamp-hub ransmissible orque and he value saed in he secion echnical characerisics. crew ighening orque m W Weigh kg J oupling momen of ineria kgm 2 n max aximum rpm min - rasco couplings (037.05) 5

7 Recommended coupling ub Bore Dia. and ransmissible orque [m], Valid for shaf olerances k ,7 0,8, 9,,4,7,9 2,2 2,5 2, ,5 2,9 3,3 3,7 4, 4,6 5 5,8 6,2 6,6 9/ / / / Fig. Fig. 2 Order form G 24/28 F20 24/28 R RO hub execuion bore Keyway pider and spider colour (R = red, G = yellow, ec...) 6 rasco couplings (037.05)

8 f ype - hrink disc execuion his ype of coupling provides excellen kineic uniformiy. Furhermore, he absence of keys or grubscrews makes i a well balanced coupling and grealy faciliaes insallaion and removal. n exac radial/ axial posiioning is easy for hose applicaions which require i. he absence of keyways also avoids freing corrosion and backlash be ween he shaf and he hub. his is he ideal ype of coupling for applicaions requiring precision and/or high roaional speeds. Ø G Ø f F min F max f crews per locking elemens [m] ub W [kg] J [kgm 2 ] nmax [min - ] UU UB D OKG ,3 0,049 7 x / ,9 0,20 30 x / ,0 0, x / ,0 0, x / ,0 0, x UB D OKG ,0 2, x ,0 3, x ,0 4, x ,0 6, x G UU UB D OKG 30 0,5 50 8,5 3 0, ,0 3, , ,5 5, ,0 5,6 UB D OKG ,0 5, , ,5 8,3 RO Using hub execuion, he shrink-disc maximum ransmissible orque is he minor beween he value saed in he able below and he value saed in secion echnical characerisics. Recommended coupling ub Bore Dia. and ransmissible orque [m], valid for shaf olerances k / / / / Order form G 24/28 R 24/28 F20 RO hub xecuion (wih shrink disc) bore pider and spider colour (R = red, G = yellow, ecc...) crew ighening orque m W Weigh kg J oupling momen of ineria kgm 2 n max aximum rpm min - rasco couplings (037.05) 7

9 ype - hrink disc execuion according o D recision zero-backlash coupling designed for muli spindle devices on machine ools or conrols wih reduced mass, such as shor cener spindles, muli-ceners primary spindles in work saions, or joined o high speed bearings wih limied olerance range. is suiable for very high speeds of roaion (up o speeds of 50 m/s). Ø F 6 [m] ub W [kg] J [kgm 2 ] nmax [min - ] 2 F F2 F3 UB D OKG 4 4,89 0,080 x /24-37,5 6 3,05 0,60 37 x / ,5 0,90 46 x / ,90 0, x / ,50 0, x / ,50 0, x / ,00, x ,00 2, x ,00 3, x ,00 4, x UB D OKG ,5 5,5 3 0, ,5 37, ,0 3, , ,0 3, , , , , , ,5 5, , ,0 5, , ,0 5, , , , ,5 pindle size RO K [m] 98 h. 64 sh. D Kmax [m] K [m] Kmax [m] 25 x , x 25 9/24-37, x 30 9/ x 35 24/ x 45 24/ x 55 28/ Order form G 24/28 R 24/28 F20 RO hub xecuion (wih shrink disc D 69002) bore pider and spider colour (R = red, G = yellow, ecc...) crew ighening orque m W Weigh kg J oupling momen of ineria kgm 2 n max aximum rpm min - 8 rasco couplings (037.05)

10 G double cardanic execuion his execuion allows higher misalignmens. he 2 spiders allow a high vibraion dampening providing a decrease in drive noise and longer life of relaed componens (ex. bearings). he inermediae elemen is made of aluminum alloy and may be used in combinaion wih any ype of hub execuion. Ø a Ø G a Ø a Ø G a Ø V V Fig. Fig.2 Fig.2 Fa min Fa max V G W [kg] J [kg m 2 ] Fig. UB UU G ,003 0, ,007 0, ,5 0 0,024 0, RO ,05 0, ,4 0, , ,22 0, ,35 0,00035 UB UU G ,5 0, , ,67 0, ,97 0, , ,43 0,004 2 G... R... G... R... G... G... R... G... R... G... Order form G 48 pacer elemen W Weigh kg J oupling momen of ineria kgm 2 rasco couplings (037.05) 9

11 G R execuion wih inermediae shaf his zero backlash execuion, allows o connec long disance shafs in applicaions such as lifing screwjacks, ganry robo ec. he inermediae shaf is made of seel bu may be of differen maerial for specific need. he presence of 2 spiders, increases he dampening properies and allow high misalignemens. 2 ez - d dr R ZR xernal hub nernal hub Dimensions finished bores dmin dmax crews Din s [ m] [ m] s 2 R R min ZR dr x ighening x2, , R+22 4 x 2.0 9/ x / x / x / x R x R x , R x R x 4.0 On reques Order form G R 24 RO inernal hub xecuion 24/28 R pider pider colour R red, V green, ec. crew ighening orque m ransmissible orque momen m 0 rasco couplings (037.05)

12 G R3 execuion wih inermediae shaf deal execuion for long disance shaf connecions. orque ransmission is zero backlash. is used in applicaions such as auomaic machines, lifing machines, palleizing machines, and handling machines. Designed for lengh up o 4 m wihou bearing suppor (depending on roaion speed). he double slo execuion, allows spider mouning and replacemen wihou driver/driven machine displacemen. ll alumnum alloy for a very low ineria. Ø D e ez - zw Ø Ø dmax Ø dr w Dimensions finished bores dmin dmax crews D lamping [m] omen of ineria [0 3 kgm 2 ] wih dmax hub ub J ub 2 J2 haf J3 orsional rigidiy [m/rad] w w min zw D e dr , ,0304 0, , w , , ,0448 0, ,7629 0,095, , ,2572 3, ,266 0,5523 4, ,87044,834 9, w , engh on reques w+50 73, , w , , w , w , RO Bores and orques for fricion wih hub wihou keyway [m] Order form G R /28 R RO exernal hub xecuion pider pider colour R red, V green, ec. nermediae shaf on reques. crew ighening orque m J oupling momen of ineria kgm 2 orsional rigidiy m/rad rasco couplings (037.05)

13 echnical daa for inermediae shaf couplings (G R - G R3) isalignmen ssial Ka ngular Kw [ ] kr 4,0 0,9 9,2 0,9 kw 24,4 0,9 28,5 0,9 38,8 0,9 ngular misalignmen = 0,9 per spider Radial misalignmen Kr = ( z 2 ) an( Kw) o = 2 spider + inermediae shaf inermediae shaf [m / rad] inermediae shaf = zw wih zw = oal coupling lengh elecion diagram G R3 coupling G R3 38 G R3 28 G R3 24 G R rpm [min - ] w 2 rasco couplings (037.05)

14 echnical characerisics he following echnical characerisics apply o all ypes of RO couplings. When using he, and versions, check he orque values given in he able agains he allowable hub ransmission values for he respecive versions given in he perinen secions. RO couplings can wihsand axial, radial, and angular misalignmen. ven afer operaing for an exended period wih a misalignmen, here is sill zero backlash because he elasic elemen is only sressed by pressure loads. When an applicaion causes a high degree of misalignmen, a double flexing ype coupling can be provided which avoids he formaion of reacion forces. lease conac our ngineering Office /24 24/28 28/38 38/ hore K [m] Kmax [m] sa. [m/rad] din. [m/rad] r [/mm] 92 h. (yellow),2 2,4 4, ,6 0, 98 h. (red) , ,6 0,06 0,9 64 h.d (green) 2,4 4,8 34, ,6 0,04 0,8 92 h. (yellow) 3 6 3, ,8 0,3 98 h. (red) 5 0 5, ,8 0,08 0,9 64 h.d (green) , ,8 0,05 0,8 92 h. (yellow) 7,5 5 4, ,5 98 h. (red) 2,5 25 7, ,09 0,9 64 h.d (green) , ,06 0,8 80 h. (blu) ,2 0,5, 92 h. (yellow) ,2 0, 98 h. (red) ,2 0,06 0,9 64 h.d (green) ,2 0,04 0,8 80 h. (blu) ,4 0,8, 92 h. (yellow) ,4 0,4 98 h. (red) ,4 0, 0,9 64 h.d (green) ,4 0,07 0,8 80 h. (blu) ,5 0,2,3 92 h. (yellow) ,5 0,5 98 h. (red) ,5 0, 0,9 64 h.d (green) ,5 0,08 0,8 92 h. (yellow) ,8 0,7 98 h. (red) ,8 0,2 0,9 64 h.d (green) ,8 0,09 0,8 92 h. (yellow) ,9 98 h. (red) ,4 0,9 64 h.d (green) , 0,8 92 h. (yellow) , 0,23 98 h. (red) , 0,6 0,9 64 h.d (green) , 0, 0,8 92 h. (yellow) ,2 0,24 98 h. (red) ,2 0,7 0,9 64 h.d (green) ,2 0,2 0,8 92 h. (yellow) ,6 0,25 98 h. (red) ,6 0,8 0,9 Ka Kr Kw [ ] RO ll he echnical daa in he caalogue are valid for roaion speeds of 500 rpm and a working emperaure of 30. For linear speed over 30 m/s, i is recommended o balance dynamically he couplings. isalignmens ssial ΔKa ΔKw ngular Radial ΔKr K oupling nominal orque m Kmax oupling maximum orque m orsional rigidiy m/rad r Radial siffness /mm K a aximum axial misalignmen mm K r aximum radial misalignmen mm K w aximum angular misalignmen rasco couplings (037.05) 3

15 nsallaion and mainenance. arefully clean he shafs 2. nser he hubs ono shafs being conneced. Wih he, and versions, be sure o ighen he screws wih he s orque value given in he caalogue. Be careful wih he and versions o ighen he screws uniformally and crosswise o he recommended orque 3. osiion he elemen in one of he wo coupling halves 4. Fi ogeher he wo coupling halves, making sure he s dimension is properly observed. his mus be done o insure proper elasic elemen funcion and long service life, as well as o assure he coupling is properly insulaed elecrically Wih he and versions, mouning he hubs can be faciliaed by lubricaing he shaf conac surfaces wih an oil, bu do no use a molybdenum bisulphide based oils. When mouning he RO coupling an axial hrus is generaed which disappears when he mouning has been compleed o avoid pu ing axial loads on he bear ings. he elasic elemen should be lubricaed during mouning operaions o reduce he axial force required during moun ing. oe: ll roaing pars mus be guarded. 4 rasco couplings (037.05)

16 elecion in according o D he coupling mus be chosen so he applied working loads do no exceed he allowable values whaever he working condiions are.. heck he load wih respec o he nominal orque he nominal coupling orque mus be greaer han or equal o he nominal orque of he drive machine for all working emperaures. 2. heck he load wih respec o he orque peak values K K θ he maximum coupling orque mus be greaer han or equal o he orque peaks ha occur during operaion for all working emperaures. K max Z θ + K θ D () m () oor-side peaks: Driven-side peaks: = + = + m + m + 3. heck he load wih respec o periodic orque inversions By means of resonance When he resonance frequency is passed rapidly below he operaional inerval a few orque peaks will be seen. he generaed alernaing loads mus be compared wih he maximum orque he coupling can suppor. oor-side peaks: = VR + m + () K max Z + θ D K θ D Driven-side peaks: m = VR + m + () 4. heck he load wih respec o nonperiodic orque inversions o check he load wih respec o nonperiodic orque inversions, he following equaions mus be saisfied: oor-side peaks: W m = Driven-side peaks: V fi W = Vfi m + m + () o be added if a orque peak occurs during acceleraion. 0,25 K = KW W θ f D RO alculaion coefficiens θ = emperaure facor [ ] 30/ θ,2,4,8 ν = aring frequency facor /h Z,2,4,6,8 f = Frequency facor f in z 0 >0 f f/0 D = orsional rigidiy facor ooling machines o = hock facor of impac osiioning sysem o a igh,5 edium,8 rong 2,2 peed and angular acceleraion indicaor Vfi = orque-mplificaion facor = n n ψ + 2π 2 2 R ψ + 2π [ ] nr = Resonance frequency = 30 J + J m = ass facor = din min π J J J J rasco couplings (037.05) 5

17 xample of selecion pplicaion ervomoor driving a recirculaing ball screw on a machine ool ominal orque eak orque Rpm omen of neria emperaure K = 0,0 m = 22,0 m n = /min J = 0,0058 kg m 2 = +40 hock able omen of neria Driven haf oor haf igh J3 = 0,0038 kg m 2 dc = 20 mm h6 (wihou keyway) dm = 24 mm h6 (wihou keyway) elecion 24/28 ype coupling wih Red elasic elemen (98 h. ) andard coupling orque: aximum orque: ub omen of neria: ouple ransmied by aper locking ring: K = 60 [m] Kmax = 20 [m] J 2 = 0,00035 [kg m 2 ] 92 [m] per foro 20 cal = { 3 [m] per foro 24 oad check K = K θ D = 0,2 4 = 48,0 [m] = 48,0 m< K cal J m = J = J + J2 J J3 + J2 J = m + = 22,0,5,5 + = = m =, 5 3,2 [m] + = 3,2,6,2 + 2,5,2 4 85,34 [m] K max = Z θ K θ D = = 85,34 m< K max cal K oupling nominal orque m K oor-side nominal orque m Kmax oupling maximum orque m oor peak orque m / Driver-side peak orque m cceleraion delivered orque m / Driven-side peak orque m V R Resonance facor V fi orque amplificaion facor m ass facor J oor-side ineria kgm 2 J Driven-side ineria kgm 2 Ψ Dampening facor n R Resonance speed min - orsional rigidiy m/rad ransmissible orque momen m oor-side shock facor Driven-side shock facor Z ar frequency facor θ emperaure facor D orsional rigidiy facor f Frequency facor W orque wih reversal of he machine m KW orque wih reversal ransmissible by he coupling m al ub-shaf connecon maximum orque m 6 rasco couplings (037.05)