The Greater the Torque, the Falk™ TRUE HOLD® Low Speed
Contents
1. lt ACCUMULATOR W 222 PRESSURE 0 HYDRAULIC PUMP CI Rexnord Industries LLC 1979 2009 561 110 9 oS Type NRTH Style B L S Applications Dimensions Inches amp Millimeters 180 and 0 PREFERRED 1809 c6 ecco 4 GREASE PURGE E FITTINGS SIZES 1055 in 1065 amp 1085 270 BREATHER VENT TORQUE ARM 1055 1065 CAN GO ON EITHER SIDE amp 1085 NRTH ONLY DIRECTION OF FREE ROTATION ARROW PURCHASER TO FURNISH EITHER __ PIPE PLUG STIRRUP OR d k ANCHOR PIN BACKSTOP SHOWN AT 180 MOUNTING POSITION 4 SETSCREWS SIZES 1055 1065 amp 1085 Dimensions Inches Torque Bore Backsto an Max Torque Arm Wt Size EN Min max A B D E J X Y 0 Pe Fasteners t Il 10457 2 100 1 800 1 75 2 50 6 50 4 19 3 50 0 656 1 25 7 00 575 10 375 250 150 0 78 0 72 3 38 0 06 11 50 2 62 8 3 8 24 X 1 0 LG 29 1055 110 000 500 1 75 3 75 9 75 1814 7 50 1 125 2 00 136 001 850 0 625 400 400 125 0 63 6 53 0 48 42 88 5 50 R 1 2 20 X2 0 LG 157 1065 113 000 400 2 50 4 50 110 50 8 64 8 00 1 125 2 00 36 00 925 0 625 400 400 1 25 0 63 7 03 0 48 43 25 5 88 8 1 2 20 X2 0 LG 190 1085 118 000 3501 3 94 5 44 112 001 8 52 7 63 1 250 3 00 51 00 10 00 0 750 600 110 001 N A N A 6 63 0 50 60 00 52. galk 7 R NRT gull tests cold Te re At each of separ otaona position 45 degree apart we packs o Te S subi cred ul oad re ctione propery t t p ro to es co a tem Pes u ts and f I calls fi fret spin test completion and aw a9 we tempe Aure rise groove 8 est I m or fu 1 uo reversas were appe as above ame packstor Te n eac h N axi mum ti n 9 I un cope e R stc T rati oad ertifi in Test rtificates g speed avai piter gul condition ste goove was al I e run wwe overt cua direc o v 30 minutes and we ouowin u p on pe ance parame ere yates requ test Spec es t oper emper Rise seal action 9 Noise che orag Tore Falk certifies ynat Anis packstoP sod tO and ope nas uoces f posse ood V ptt test paie d OR exnord Industri ustries LLC 20 09 561 25 NRT INDUSTRY APPLICATIONS AGGREGATE NRT mounted on headshaft on Primary Crusher Out feed conveyor from quarry to stockpile COAL NRT headshaft mounted on clean coal stockpile belt conveyor COPPER NRT headshaft mounted on secondary crusher out feed conveyor 26 561 110 CEMENT NRT on headshaft of Clinker Bucket Elevator COAL NRT one of two units reducer LS shaft mounted on triple 1000kW drift conveyor handling coal i di h COPPER NRT headshaft mounted on plant i
3. OUTER RACE CLAMPING 4 a FREEWHEELING SPRING FORCE CLAMPING POSITION FREEWHEELING POSITION FREEWHEELING CLAMPING INNER RACE Over Running Sprags are held in place by a cage providing equal separation to ensure no binding occurs while the backstop is in an over running condition The graph below illustrates the maximum speed and torque for both the NRT and NRTH style backstops torque e RPM 1000000 600 500 PS 100000 400 amp c u 300 E S 10000 200 100 1000 0 S S SOS P S EE REXIND RD ES Rexnord Industries LLC 2009 561 110 3 How to Order The following information along with selection information from Pages 6 thru 8 is required to order USABLE a backstop LENGTH of torque CW used to select CCW Motor Brake or Lift o Torque arm mounting position 2 see Pages 10 13 KEYWAY Overrunning rotation e Number of retaining collars System Characteristics Supply any information about the system to which the Falk NRT or NRTH backstop is being applied that would affect the selection of the backstop or holdback for example Are there any torque limiting devices with the motors Is material feed restricted in any way to prevent overload of the material handling system Will the system produce overloads that could exceed the motor
4. 150 170 13 0 170 200 15 0 2 1115NRT 12 0 13 0 2 15 0 17 0 2 1125NRT 180 200 45 0 15 0 45 X25 305 305 2 200 230 50 0 17 0 50 X 28 305 305 2 230 240 56 0 20 0 56 X 32 280 250 2 1135NRT 210 230 50 0 17 0 50 X28 350 350 2 230 260 56 0 20 0 56 X32 350 350 2 260 280 63 0 20 0 63 X 32 330 315 2 1145NRT 17 0 350 350 2 20 0 350 350 2 20 0 350 350 2 22 0 350 340 2 1155 20 0 63 0 12 4 63 X32 360 360 2 22 0 10 0 144 10 X 36 360 360 2 25 80 0 154 80 X 40 360 330 2 Keys are furnished by the Factory to suit shaft and backstop keyways Keys are either cold drawn 1045 or heat treated alloy steel 310 350 HB Only use keys furnished by the Factory Shaft keyway depth tolerance of 000 025mm is recommended t Number 1 keys are cold drawn 1045 steel Number 2 keys are heat treated alloy steel 310 350 HB and Number 3 keys are Mild Steel Backstops supplied with E7 bore and DlOkeyway assuming shaft diameter and h9 keyway ISO tolerance specification Rexnord Industries LLC 1979 2009 561 110 19 Engineering Recommendations Table 2 Backstop Shaft Fits Inch Table 3 Metric Bores for Backstops Nominal Diameter Nominal Shaft Nominal Bore Bore Shaft Nominal Diameter Nominal Shaft Nominal Bore Bore Shaft From Incl Tolerance DiameterTolerance Clearance x over to Tolerance Tolerance Clearance e in 12500 15000 0000 0005 0005 0015 0005 00
5. NRT Overrunning Figure 6 For most of its operating life a backstop is in the overrunning mode of operation The rollers roller cage and stop lugs rotate with the inner cam as a unit since they are connected by the energizing springs The outer race does not rotate since it is bolted to the end covers which are held by the backstop torque arm While overrunning the rollers roll on the outer race and slide on the inner cam ramps Friction and centrifugal force tend to lift the rollers off the cam minimizing contact and wear Figure 7 Figure 6 STATIONARY OUTERRACE ROLLER CAGE TR SS A ROLLER f OVERRUNNING ROTATION STOPLUG Figure 8 NES N ROLLER BACKSTOPPING The energizing springs stretch during overrunning to provide tension to the roller cage assembly Figure 3 This tension keeps the rollers ready for instantaneous backstopping engagement and minimizes the relative rotation of the roller cage to the inner cam The stop lugs axially position the roller cage assembly on the inner cam They also prevent the roller cage trom rotating too far which would cause the rollers to strike the upright side of ae adjacent ramp Maximum relative rotation of the roller cage assembly and inner cam during overrunning is between 040 n 2 mm an 100 2 04 mm depending on size as limited by the stop lugs 14 561 110 Backstopping Figure 8 As the rotating shaft stops and attempts to re
6. 1 750 x1 500 11 00 11 00 1125NRT 1 250 7 5000 1 750 150 1 750 x1 500 11 00 11 00 1 500 9 0000 2 000 150 2 000 x 1 500 11 00 10 50 8 5000 2 000 150 2 000 150 2 000 x 1 500 11 00 10 00 1135NRT 8 500 9 0000 2 000 150 2 000 150 2 000 x1 500 11 00 10 00 9 000 10 5000 2 500 875 2 500 875 2 500 x1 750 12 00 9 50 9 0000 2 000 150 2 000 150 2 000 x1 500 13 00 13 00 1145NRT 9 0000 11 0000 2 500 875 2 500 875 2 500 x1 750 12 00 11 50 11 0000 12 0000 3 000 1 000 3 000 1 000 3 000 x 2 000 13 00 11 00 10 5000 2 500 2 500 10 500 11 0000 2 500 x2 500 TISSNRT 11 000 13 0000 3 000 x 2 000 13 000 13 2500 3 500 x 2 500 12500 130000 Q0 3000 200 1165NRT 13 000 15 0000 3 500 x2 500 15 000 15 5000 1 000 x 3 000 1085NRT III WO CO WO VIII OUI I J I Co c5c5c5c DO DW gt gt NAI Co Oa cc DD oOo DO gt gt gt ND gt r 2 RYO ND RD ND RD ND ND rR RORY e er e D L3 RYO gt Re FRY ND me L3 L3 ND RF L3 RO RO RD Re L3 RD oO CO OO oO O9 OVI O9 O9 GY CO OO OY CO OO 13 5000 3 500 1 250 3 500 x 2 500 16 00 15 50 1175NRT 13 500 15 0000 3 500 1 250 3 500 x 2 500 16 00 15 50 15 000 17 5000 4 000 1 500 4 000 x 3 000 13 00 13 00 15 5000 4 000 1 500 4 000 x 3 000 17 00 13 50 1185NRT 15 500 18 0000 4 000 1 500 4 000 x 3 000 17 00 13 50 18 000 20 0000 5 000 1 750 5 000 x 3 500 14 00 13 50 Keys are furnished b
7. 1250 15 50 37 2 166 15 6 19 80 30 1552 2 00 2 54 4 8 6 3 20 0 100 0 118 6 138 60 85 3120 1175NRT 519 000 80 1350 17 50 436 174 164 23 00 0 pI 2 00 2 60 2 13 24 0 120 0 141 8 143 51 08 4800 1185NRT 1 747 000 10 1550 20 00 50 0 180 17 0 24 90 30 20 02 2 00 244 40 101 27 2 120 0 1 145 0 14 7 5215 6625 Dimensions are for reference only and are subject to change without notice Size 1075 with bores over 3 4375 D 6 50 unless certified Size 1085 with bores over 4 75 D 7 20 G 80 T Refer to the Factory for higher maximum overrunning speeds A Size 1105 with bores over 6 9375 D 10 50 G 1 24 Key is furnished by the Factory Size 1115 with bores over 8 00 D 12 12 Weight shown is for backstop with minimum bore and without oil Counterbore is for manufacturing B Dimension P is minimum required shaft engagement see Table 1 for minimum key engagement Shaft and key stresses Dimension G is the retaining collar thickness for one collar Size 1075 bores over 3 50 Size 1085 bores over 4 75 and Size 1115 bores over 8 00 requite two collars one on each side or one collar with a step in the shaft Check usable shaft length if two 2 collars are Purchaser The purchaser is responsible for assembling the used backstop retaining collar when furnished oil line oil level sight gauge air vent and for furnishing the oil and the torque arm stirrup per the Rexnor
8. 150 000 180 000 195 290 200 000 208 333 212 000 231 460 240 000 249 000 250 000 265 000 300 000 316 667 346 000 375 000 376 100 416 667 506 300 519 000 540 000 700 000 720 000 747 000 1045NRTHB 1055NRTHC 1065NRTHC 1055NRTHB 1075NRT 1065NRTHB 1085NRT 1085NRTHB Bore Range 175 All have Nitrile Seals up to 225 22 561 110 Width w o Axial Retention ALTRAINDUSTRIAL MOTION formerly MARLAND TYPE BC BC M amp BC MA 3MA 2M 200 6MA AM 275 12MA 8M 350 18MA 12M 425 27MA 18M 500 45MA 30M 550 63MA 42M 600 90MA 60M 700 135MA 90M 800 180MA 120M 900 240MA 160M 1000 ALTRA INDUSTRIAL MOTION formerly FORMSPRAG TYPE LLH S amp LLH R Bore Range wat 136 J 160 215 325 570 750 800 830 1 400 2 100 3200 2100 4 200 6 000 3500S 3500R 13 44 10 25 20 0 18 06 280410 1 0 18 75 5 050 6 000 9 000 9 000 5 030 10 000 10 000 Rexnord Industries LLC 1979 2009 Falk Type NRT amp NRTH Backstop Interchangeability Chart oe es PA MG 600 MG 700 CB 7C MG 750 CB 12C MG 800 MG 900 CB 19C MG 1000 CB 30C CB 45C CB 65C CB 90C CB 150C CB 200C CB 250C CB 375C CB 500C Rexnord Industries LLC 1979 2009 prem MORSE MG amp CB Torque Bore ars Bore rare Width Rati ur ue wie Putine al wal mar ia w o Axial ib te Retention Retention Retention BS 200 BS 160 HS BS 220 BS
9. 4962 8001 BRAZIL Rexnord Correntes Ltda Sao Leopoldo RS Phone 55 51 579 8022 Fax 55 51 579 8029 REXNRD Rexnord Industries LLC Gear Group 3001 West Canal Street Milwaukee WI 53208 4200 USA Phone 414 342 3131 Fax 414 937 4359 2009 Rexnord Industries LLC CANADA Rexnord Canada Ltd Scarborough Ontario Phone 1 416 297 6868 Fax 1 416 297 6873 CHINA Rexnord China Shanghai China Phone 86 21 62701942 Fax 86 21 62701943 EUROPE Rexnord NV SA Mechelen Belgium Phone 32 15 443881 Fax 32 15 443860 LATIN AMERICA Rexnord International Milwaukee Wisconsin Phone 1 414 643 2366 Fax 1 414 643 3222 E mail international1 rexnord com MEXICO Rexnord S A de C V Mexico DF Mexico Phone 52 55 9140 3500 Fax 52 55 9140 3550 SINGAPORE Rexnord International Inc Singapore City Singapore Phone 65 6338 5622 Fax 65 6338 5422 UNITED STATES Customer Service Phone 866 Rexnord 866 739 6673 E mail rexnordcs state rexnord com Example rexnordcsohio rexnord com ALL COUNTRIES NOT LISTED ABOVE Rexnord International Milwaukee Wisconsin Phone 1 414 643 2366 Fax 1 414 643 3222 E mail international2 rexnord com 561 110 02 2009 Delzer Litho Printed in USA
10. 88 10 5 8 18 X 1 75 LG 260 Dimensions Millimeters Torque Bore x Backsto Max Torque Arm Wt t E p Rating Min Mo A B Cm E F G H J K L W X Y 0 Pe Fasteners kg 10457 2 847 1800 44 64 165 106 8 17 32 178 M6 10 64 38 20 18 86 2 292 67 8 3 8 24 X 1 0 LG 132 1055 13 557 500 44 95 248 207 191 29 51 914 216 16 102 102 32 16 166 12 1089 140 8 1 2 20 X20 LG 112 1065 17 625 400 64 114 267 219 203 29 51 914 235 16 102 102 32 16 179 12 1099 149 8 1 2 220 X240 LG 86 1 1085 1244031 3501 100 114013051216 1 194 32 76 11295 254 19 152 254 N A N A 11681 13 1154 149 10 5 0 18 X 1 75 LG 118 2 Key is furnished by the Factory T Fasteners are Hex Socket Head Cap Screws Grade 8 t Weight shown is for backstop with minimum bore Minimum shaft engagement for backstop support m Length through hub 1085NRTH Hole for lifting purposes only 1045NRTH backstops are shipped with lubriplate AERO NLGI 1 Grease Lubricant 1045NRTH backstops require a keeper plate or retaining collars for axial retention 1055 1065 and 1085NRTH backstops are shipped with lubricant DEXRON 1055 1065 and 1085NRTH backstops are furnished with four 4 radial holes and setscrews in the inner cam for axial retention on the shaft Mounting Positions The backstop rotational axis must be Purchaser The purchaser is
11. OFF F CLEARANCE OUTER RING SUPPORT RING 4 SES SINS A CAGE D LD SPRAG FREEWHEELING DIRECTION N gt Rexnord Industries LLC 1979 2009 The proprietary geometry of the sprags allows for the one way operation of the backstop see illustration During normal operation of the backstop the inner race rotates in the free direction while the outer race remains stationary During an attempted reversal of the backstop torque is instantly transmitted from the inner race through the sprags to the outer race which is held stationary with a torque arm The features of the backstops are zero backlash large bore capacity large torque capacity and grease purge cavities on sizes 1055 foes and 1085 NOTE If all the upgraded features of the NRT style RENI are not required then consider the 1055 1065 and 1085 NRTH tyle B backstops as a less expensive alternative to the NRT backstop design OUTER RACE CLAMPING 4 a FREEWHEELING SPRING FORCE CLAMPING POSITION EREEWHEELING POSITION ACOT CA FREEWHEELING CLAMPING INNER RACE sprags to operate without wear Figure 11 When the overrunning speed of the backstop has reduced sufficiently so that the centrifugal force is less than the spring force the sprags will return to their contact positions and stand ready to transmit torque without backlash Figure 12 Special features are increase service life reduced heat generated h
12. Required Backstop Torque Required Backstop Torque System Torque x Motor Maximum Torque Stall or Breakdown Torque 6 A 150 For Figure 3 Tandem motor tandem backstop arrangements select each backstop to hold 6096 of the total Required Backstop Torque A Use whichever is greater A From Page 10 11 or 13 select backstop with a torque rating equal to or greater than the required torque rating determined above B Checkthe maximum bore Page 10 11 or 13 If a larger bore is required select the next larger size or turn the headshaft down C Check the maximum overrunning speed from Page 10 11 or 13 Refer to the Factory for higher speeds D Check backstop reaction force at torque arm stirrup Table 4 Page 20 E Backstop and torque arm dimensions are listed on Page 10 11 or 13 allow space for installation F Only use keys furnished by the Factory It the backstop is mounted on the double ended extension of the drive shaft check shaft stresses and use dual path safety lock couplings or a minimum 2 0 service factor on the combined horsepower for the coupling on the NRT side Indexing requirements must be referred to the Factory for selection 4 NRTH Style B and NRTH Style C backstops are rated for more than 1 000 000 cycles of backstopping NRT Backstops are rated for 100 000 backstopping cycles If your application needs more than 100 000 load cycles refer application to the Factory for selection
13. Rexnord Industries LLC 1979 2009 Engineered Selection Method for Inclined Conveyors It is possible to fine tune the selection and possibly consider the selection of a smaller size backstop if detailed loading and conveyor profile information is furnished The following data is necessary e Power to lift the load vertical Power to move emply belt friction e Power to move loaded belt horizontally friction We can calculate these values if the following data is provided Conveyor length L meters Belt speed mpm 7 Metric tons per hour L Total lift H meters e Belt width millimeters e Material weight Kg M Pulley rpm rev min or diameter meters Selection Example The selection examples below show the benefits gained from obtaining the required information to select by brake or lift torque vs motor torque Steep Slope Conveyor 150 Motor kW 135 Brake kW 115 Lift kW 20096 Stall 68 rpm rev min 125 mm Dia Motor kW and Stall 96 Known 150MkWx9550 200 68RPM 1509 28 088 Nm Motor Torque Size 1095 NRT Brake kW Known 135 BkW x9550 200 68RPM 150 25 279 Nm Brake Torque Size 1095 NRT Lift kW Known 115 LkWx9550 200 68RPM 150 21 534 Nm Lift Torque Size 1085 NRT 561 110 7 Common Drive Arrangements Figure 1 Single motor single backstop arrangements For drive arrangements shown in Figures 4 amp 5 Engin
14. and per Rexnord installation manuals which are available upon request Suitable guards for rotating members may be purchased from Rexnord as optional accessories Refer to your local Rexnord District Office for complete details WARNING Lock out power source and remove all external loads from gear drive before servicing drive or accessories Locking out the power source and removing the load will reduce the possibility of an unexpected motion or reaction in the system People Conveying Equipment Selection of Rexnord products for applications whose primary purpose is the transportation of people is not approved This includes such applications as freight or passenger elevators escalators man lifts work lift platforms and ski tows and ski lifts If the primary purpose of the application is material conveyance and occasionally people are transported the Rexnord warranty may remain in effect provided the design load conditions are not exceeded and certification to the appropriate safety codes and load conditions has been obtained by the system designer or end user from the appropriate enforcement authorities Lubricants Refer to Manuals 568 101 568 102 568 104 and 568 110 for a listing of transmission fluids oils and greases that meet Rexnord specifications Stored or Inactive Backstops Backstops Sizes 1075 1185NRT are shipped without lubricant with one ounce of Motorstor vapor phase rust inhibitor in the backstop that
15. protects the internal parts against rust for a period of six months If the backstop Sizes 1075 1185 is to be stored or inactive for more than six months add lubricant and Motorstor as recommended in the service manual for every additional six month period Indoor storage or a suitable covering is recommended Backstop Size 1045NRTH Style B is shipped with grease If stored once every two months inner race should be rotated by hand to lubricate rotating elements Sizes 1055NRTH 1065NRTH and 1085NRTH Style B are shipped from the factory filled to the proper level with oil If 050 rotate inner hub every two months to lubricate rotating elements Backstops Sizes 1055 and 1065NRTH Style C are prelubicated and require no further maintenance of the working mechanism If the backstop is to remain inoperative for extended periods of time remove the load before shutting down Refer to service manual tor complete instructions Product of the Daubert Chemical Company Chicago IL 561 110 5 How to Select Falk TRUE HOLD NRT amp NRTH Backstops Imperial Refer to Page 24 for explanation of terms and Page 4 for How to Order 1 Determine Drive Arrangements from Page 8 2 Determine System Torque Fig 1 Single motor Single backstop arrangements Fig 2 Tandem motor single backstop arrangements Fig 3 Tandem motor tandem backstop arrangements Figs 4 and 5 Refer these arrangements to Fa
16. use sled runner type keyway It may induce undue forces on ackstop LI E 561 110 17 Engineering Recommendations Table 1 Shaft and Keyway Dimensions Inches Nominal Shaft Shaft Keyway Backstop Keyway BACKSTOP Diameter Key Lenath em Ke Key x SIZE y Leng y y Ee wath ent Width xHeight Furnished Engagement Material 1 3750 2 2500 0 500 0 250 0 500 0250 0 500 0 500 3 500 2 625 2 2500 2 5000 0 625 0313 0 625 0125 0625X0438 3500 2425 mus nm 1055NRTH 2 1500 3 2500 0 750 750 X 0 750 3 2500 3 3750 0 875 875 X0 2 5000 2 7500 0 625 625 2 1500 3 2500 0 750 750 1065NRTH 3 2500 3 7500 0 875 3 1500 4 0000 1 000 000 4 0000 4 5000 1 0 000 3 9375 4 5000 1 000 0 500 1 000 0 500 1 000 X 1 000 1 625 5 875 1085NRTH 1 5000 4 7500 1 1250 0 625 1250X1250 1 625 5 875 4 1500 5 4375 1 250 0313 1 250 X0 938 1 625 5 875 500 x 500 500 x 500 2500 2 625 x 625 1075NRT 1500 3 l 150 x 750 875 X 875 875 x 625 1 000 x 750 150 x 750 150 x 750 875 x 875 1 000 x 1 000 1 250 x1 250 1 250 8750 875 X 875 i i 875 x 875 1095NRT 3 1500 4 i 1 000 x1 000 4 3000 1 250 x1 250 1 250 x1 125 1 250 x1 250 4 9375 5 1250x1250 1105NRT 55000 1 500 x 1 500 1 750 x 1 500 1 500 x1 500 i 1 500 x1 500 1115NRT 900 7 i 1 750 x1 500 2 000 x 1 500 2 000 x 1 250 1 2500 1 750 150
17. 13 557 36 00 914 32 40 823 5 556 24711 1055NRTH C 4 400 5 965 36 00 914 32 40 823 2 444 10 873 1065NRTH B 13 000 17 625 36 00 914 32 40 823 1 222 32124 1065NRTH C 8 400 11 388 36 00 914 32 40 823 4 667 20757 1085NRTH B 18 000 24 403 51 00 1295 45 90 1166 1 059 31398 1075NRT 10 000 13 600 36 00 914 32 50 825 5 550 24700 1085NRT 16 000 21 700 48 00 1219 43 00 1 095 6 700 29 800 1095NRT 28 000 38 000 54 00 1312 48 50 1 235 10 500 46 700 1105NRT 45 000 61 000 66 00 1 676 59 50 1 510 13 600 60 500 1115NRT 15 000 102 000 12 00 1 829 65 00 1 645 20 800 92550 1125NRT 105 000 142 000 18 00 1981 10 00 1785 21 000 120 100 1135NRT 150 000 203 000 82 00 2 083 14 00 1 875 36 500 162 400 1145NRT 212 000 287 000 88 00 2295 19 00 2 010 48 300 214 850 1155NRT 249 000 338 000 94 00 2 386 84 50 2150 53 300 231 100 1165NRT 346 000 469 000 100 00 2 540 90 00 2 285 69 200 307 850 1175NRT 519 000 104 000 120 00 3 048 108 00 2 745 86 500 384 850 1185NRT 147 000 1 013 000 120 00 3 048 108 00 2 745 124 500 553 800 t Reaction force is based on 9N torque arm length and 1 5 catalog rating Force Ib 1 50 x Catalog Torque Rating lb ft x 12 in per ft ON in Force N 1 50 x Catalog Torque Rating x 1000 mm per m 9N mm For reduced length torque arms substitute actual N dimension in formula 20 561 110 Rexnord Industries LLC 1979 2009 Engineering Recommendations Backstop Mounting Positions The supporting shaft must be horizontal within 5 tor NR
18. 20 mm mm mm t Min Max mm 1 5000 2 9375 0000 0010 0005 0015 0005 0025 30 50 k6 002 018 025 050 007 048 3 0000 7 9375 0000 0010 0010 0025 0010 0035 50 80 m6 0111 030 060 090 030 079 8 0000 11 9375 0000 0010 0015 0035 0015 0045 80 120 m6 013 035 072 107 037 094 12 0000 14 9375 0000 0010 0020 0045 0020 0055 120 180 m6 015 040 085 125 045 110 15 0000 20 0000 0000 0020 0020 0045 0020 0065 tt n ae nt ns e A 125 micro inch or finer shaft finish and clearance fit ifi R m 920 o 315 400 m 021 057 125 182 068 161 400 500 m6 023 063 135 198 072 175 e Shaft diameters from 30 50 mm are tolerance and shaft diameters over 50 500 mm are m tolerance T Bore diameters from 30 50 mm are F7 tolerance and bore diameters over 50 mm to mm are E7 tolerance A 3 2 micro meter or finer shaft finish is recommended For shaft tolerances other than those listed in the table consult Factory for bore tolerance Specify your shaft tolerance Table 4 Backstop Reaction Force at Torque Arm Stirrup Inch amp Metric N Torque Arm Length Catalog Torque Rating ON 5 12 7 mm Torque Arm Reaction Force BACKSTOP See drawing on next page SIZE o bh m dm m nh m h N 1045NRTH B 2 100 2 847 1 00 178 6 30 160 6 000 26 688 1055NRTH B 10 000
19. 200 HS BS 250 BS 220 HS BS 270 BS 250 HS BS 270 HS BS 335 BS 300 HS BS 350 BS 350 HS BS 425 HS BS 450 HS pare pe BS amp BS HS HD1000 HD1200 HD1400 HD1600 HD1800 ror ADAMSON HD 2 100 2 250 3 000 3 333 4 000 4 400 5 000 5 788 6 000 6 500 6 666 7 000 36 165 45 000 45 509 45 833 65 000 65 100 66 667 75 236 90 721 90 410 92 500 108 425 130 190 150 467 195 290 195 456 208 333 216 850 231 460 240 000 249 000 250 000 289 133 316 667 346 000 375 000 376 100 506 300 542 123 700 000 722 832 747 000 561 110 23 Backstop Selection Procedure Definitions Application Terms Brake hp BHP Brake kW BkW Drive Pulley Motor hp Motor kW MkW Motor Starting Torque Motor Stall Torque Motor Breakdown orque Drive Pulley hp kW Single Pulley Drive 24 561 110 The calculated load required to operate the equipment For conveyors brake hp kW is based on the horsepower kilowatts required to overcome friction and the horsepower kilowatts required to lift the load vertically A pulley mounted on the headshatt which supplies power to move conveyor belt Horsepower kilowatts required to lift the load vertically Motor nameplate rating Torque that the motor is capable of supplying at zero rpm rev min for approximately 15 seconds in a design B motor or 6 seconds in a design C motor
20. 567 206 653 177 1105NRT 60 975 180 125 200 490 269 249 234 10 254 69 81 104 203 1676 1923 206 645 281 ITISNRT 101625 150 150 225 546 295 209 267 13 32 16 89 117 2M 1829 2103 229 696 395 1125NRT 12275 135 185 240 622 310 284 30896 13 32 80 91 127 305 1981 2294 244 752 513 1135 203 250 125 215 270 686 356 330 345 13 32 66 109 140 305 2083 2426 290 828 662 TI45NRT 287260 115 225 300 187 356 330 319 13 32 41 107 381 2235 2629 290 937 853 1155NRT 337 395 100 265 350 009 363 338 44 38 49 104 152 457 2388 2832 292 1071 1211 1165NRT 468830 85 320 405 945 422 396 503 13 51 65 122 160 508 2540 3012 351 1546 1415 66 62 1185NRT 11012185 70 390 510 1 1270 457 432 632 13 Dimensions are for reference only and are subject to change without notice unless certified T Refer to the Factory for higher maximum overrunning speeds t Backstops are provided with standard metric keys and keyways per ISO 773 and DIN 6885 1 Standard D10 clearance fit Weight shown is for backstop with minimum bore and without oil B Dimension P is minimum required shaft engagement see Table 1 for minimum key engagement Shaft and key stresses Dimension G is the retaining collar thickness for one collar Size 1075 bores over 90 mm Size 1085 bores over 121 mm Size 1095 over 140 mm Size 1105 bores ov
21. AINING COLLAR POSITIONS MOUNT ON EITHER SIDE D ce LLI Q Z lt 2 PURCHASER TO O FURNISH STOPS C P ev OIL LINE amp OIL LEVEL SIGHT GAGE For Bore and Keyway Sizes and Tolerances Refer to Pages 18 thru 20 Max t Bore Torque Over BACKSTOP 1 J TA Rating runnin A B C D E FO Gm K L M N 0 Wi lb aml 8 B b rpm 1075NRT 10 000 450 1 94 3 94 11 6 8 4 16 5 009 40 3 96 10 2 40 2 8 2 8 4 0 360 418 6 2 1587 155 1085NRT 16 000 350 2 94 5 19 14 8 4 16 6 50 40 A 10 3 02 2 0 3 0 5 0 48 0 55 62 24 62 210 1095NRT 28 000 300 344 5 50 154 10 6 98 1 20 40 5 91 804 320 319 3 6 6 0 540 617 8 1 25 70 390 1105NRT 45 000 180 4 94 7 44 193 10 6 9 8 9 204 40 8 50 1 00 4 2 70 34 41 8 0 66 0 75 8 1 25 40 620 1115NRT 75 000 150 5 94 8 4 215 11 6 10 6 10509 50 9 25 1 24 3 00 3 5 4 0 10 0 72 0 828 9 0 27 39 810 1125NRT 105 000 135 7 25 9 00 245 12 2 112 12 12 50 11 00 1 24 3 16 3 6 5 0 12 0 78 0 903 9 6 29 60 1130 1135NRT 150 000 125 8 50 10 50 210 140 13 0 13 60 50 10 52 1 24 2 60 43 12 0 82 0 955 114 3259 1460 1145NRT 212 000 115 9 00 12 00 310 140 13 0 14 94 50 1202 1 24 1 62 4 2 5 6 15 0 88 0 1035 114 36 90 1880 1155NRT 249 000 100 1050 1325 350 143 13 3 17 40 20 13 27 1 50 1 94 4 6 0 18 0 940 111 5 115 4215 2670 1165NRT 346 000 05
22. Dimensions Millimeters Backstop Torque Speed Range Bore x Torque Arm Size Nm Min Max Min Max DIE F 68H J K LIW X Y 0 Fastenerst kg 1055 5 965 320 2100 44 98 248 1207 191 29 51 9M 102 102 32 10 166 12 1089 140 H 1 2 20 X 2 0 LG 712 1065 113881 25011800 64 115 267 219 203 29 51 914 102 102 32 16 179 12 110991 149 8 1 2 20 X2 0 LG 86 1 Key is furnished by the Factory T Fasteners are Hex Socket Head Cap Screws Grade 8 Weight shown is for backstop with minimum bore Minimum shaft engagement for backstop support m Length through hub Style C size 1055 and 1065NRTH backstops are shipped permanently lubricated no additional lubrication or re lubrication is required Grease fittings for optonal purging of seals are provided MMN Cc e ND Mounting Positions The backstop rotational axis must be Purchaser The purchaser is responsible for assembling the horizontal within 5 backstop air vent and torque arm A 125 micro inch 3 2 micro meters or finer shaft finish is recommended The backstop and torque arm may be mounted at any desired angle Horizontal or near horizontal mounting of the torque arm provides maximum bearing life NOTE Electronic drawings are available from our Website http pt rexnord com customer support drawings Rexnord Industries LLC 1979 2009 561 110 11 Type NRT Dimensions Inches AXIAL RET
23. Falk TRUE HOLD Low Speed Backstops The Greater the Torque the Tighter the Hold English Inch Metric Falk TRUE HOLD Low Speed Backstops Never Let Safety Slip Anytime you re moving materials upgrade you have the potential for trouble Should the electric power fail a motor fail or someone trip the emergency cable the results can be disastrous for employees and for equipment That s why operations the world over rely on Falk TRUE HOLD Backstops and their instant response no slip mechanism to help put a stop to trouble before it can start Size for size TRUE HOLD Backstops provide more system holding power than any other backstop Plus Long life designs and our ability to engineer and manufacture complete integrated drive packages assure that you get the ideal system for your needs whether it s a single tandem or multiple backstop configuration Now that s confidence thats TRUE HOLD Benefits Features Falk TRUE HOLD NRT Style Long Lasting Our unique double lip dual seal system assures long life includes splash oil circulation factory packed grease cavity contamination proof oil sight glass and Airmax breather Rexnord Drives System Expertise Assistance with proper selection for your specific application whether single tandem or multiple drives For virtually any application where materials need to be moved up steep grades including inclined conveyors high a
24. TH and NRT backstops The backstop torque arm assembly may be rotated to any angular position but the postion must be specitied by the purchaser to permit Rexnord to urnish oil lines to suit the mounting for Type NRT The symmetrical backstop design permits turning the backstop end for end to provide either direction of shaft rotation The backstop overrunning or free rotation direction is indicated by a rotation arrow on each side of the backstop For NRT backstops the purchaser is responsible for mounting the backstop retaining collar oil line oil level sight gauge and air vent and for turnishing the oil and the torque arm stirrup per the Rexnord service manual Torque Arm Stirrups Locate torque arm stirrup at 9N as illustrated at right Design the stirrup to withstand the Torque Arm Reaction Force listed noe ble 4 If the stirrup must be located closer design the stirrup to withstand the force developed by the actual torque applied to the backstop Use the following formula to determine the force Drive Pulley Peak Torque Actual Reaction Force Actual Application Dimension N The torque arm must be free to move within the stirrup Provide clearance on three sides as shown at right DO NOT restrict torque arm movement by welding or securing to any supporting structure Locate the torque arm support surface parallel to the axis of the shaft on which the b
25. ackstop is mounted A boot or hood is recommended for all Re of the torque arm to prevent accumulation of material around the torque arm zu his also provides a guard against a possible pinch point DO NOT restrict movement of the torque arm Grease Purged Seals The option of adding grease is the Suc S grease to the outer cavity seal is NOT E EX could contaminate the material being processed as in the food and drug industries The company a der between the inner and outer seals for NRT backstops DO OT purge this inner cavity in the field Rexnord Industries LLC 1979 2009 THE BACKSTOP ROTATIONAL AXIS MUST BE HORIZONTAL WITHIN 5 VERTICAL BACKSTOPTORQUE ARM CAN BE NS MOUNTED AT N ANY ANCLE A BOOT ORHOOD OVERTHE BACKSTOP AND AROUND FLOORSLOT IS RECOMMENDED FORALL MOUNTING POSITIONS Le FLOOR SLOT 1 to 1 1 2 23 38 mm TO 38 mm lt CLEARANCE 1 to 1 E 1 to 1 1 2 25 25 TO 38 mm p 38 mm AN 25 TO 38 mm CLEARANCE END VIEW 561 110 21 Falk Type NRT amp NRTH Backstop Interchangeability Chart REXNORD FALK x NRTH amp NRT Torque Rating Ib ft 4 400 5 000 5 788 6 000 6 500 6 666 6 800 7 960 8 400 10 000 11 500 11 577 11 667 12 000 13 000 16 000 18 000 18 100 19 000 20 833 27 000 27 083 27 485 28 000 30 000 36 165 45 000 45 833 63 000 105 000 130 190 135 000 145 833
26. al path safety lock couplings or a minimum 2 0 service factor on the combined horsepower for the coupling on the NRT side Indexing requirements must be referred to the Factory for selection 4 NRTH Style B and NRTH Style C backstops are rated for more than 1 000 000 cycles of backstopping NRT Backstops are rated for 100 000 backstopping cycles If your application needs more than 100 000 load cycles refer application to the Factory for selection 6 561 110 Engineered Selection Method for Inclined Conveyors It is possible to fine tune the selection and possibly consider the selection of a smaller size backstop if detailed loading an conveyor profile information is furnished The following data is necessary e Power to lift the load vertical Power to move empty belt friction e Power to move loaded belt horizontally friction We can calculate these values if the following data is provided Conveyor length L feet Belt speed fpm Short tons per hour tph Total lift H feet Belt width inches e Material weight lb ft Pulley rpm rev min or diameter feet F I Selection Example The selection example below show the benefits gained from obtaining the required information to select by brake or lift torque vs motor torque Figure 1 Single motor single backstop arrangements Figure 2 Tandem motor single backstop arrangements Select backst
27. and ANSI safety codes for proper guarding of revolving parts and possible pinch points A pinch point occurs at the contact point between the backstop torque arm and support and between the torque arm and stirrup Chemical Atmospheres The backstop may be damaged if exposed to certain types of chemicals or vapors for example potash dust chlorine gas carbon tetrachloride etc These materials may cause deterioration of the seals or aluminum roller cage rings Rexnord Industries LLC 1979 2009 Operating Temperature Enclosure of the backstop may cause overheating Provide adequate ventilation Backstop operating temperatures at maximum overrunning speed may reach 200 F 93 C Determine the effect of this temperature on the driven equipment and provide cooling if necessary If a backstop operates in the sun at ambient temperatures over 100 F then special measures should be taken to protect backstop rom solar energy This protection can consist of a canopy over the backstop or reflective paint on the backstop If neither is possible a cooling device such as a fan may be required to prevent the sum temperature from exceeding the allowable maximum of 200 F 93 C Keys amp Keyways Keys used with NRT and NRTH backstops are furnished by the Factory Keys are either mild steel cold drawn 1045 steel or heat treated alloy steel 310 350 HB Use only those keys provided by the Factory see Table 1 Do not
28. ctory for selection Combine the horsepower from both motors for Fig 2 and Fig 3 System Torque 5250 MHP or BHP or LHP rom rev min MHP Motor Nameplate HP BHP Brake HP Calculated Load Use only if more than 75 of motor rating LHP Litt HP Calculated Power to Lift the Load Vertically Use only if more than 75 of motor rating LHP can be calculated as follows Short Tons Per Hour TPH x Litt in Feet 990 3 Determine Required Backstop Torque Required Backstop Torque System Torque x Motor Maximum Torque Stall or Breakdown Torque 150 For Figure 3 Tandem motor tandem backstop arrangements select each backstop to hold 60 of the total Required Backstop Torque A Use whichever is greater A From Pages 10 thru 12 select backstop with a torque rating equal to or greater than the required torque rating determined above B Check the maximum bore Pages 10 thru 12 If a larger bore is required select the next larger size or turn the headshaft down C Check the maximum overrunning speed from Pages 10 thru 12 Refer to the Factory for higher speeds D Check backstop reaction force at torque arm stirrup Table 4 Page 20 E Backstop and torque arm dimensions are listed on Pages 10 thru 12 allow space for installation F Only use keys furnished by the Factory It the backstop is mounted on the double ended extension of the drive shaft check shaft stresses and use du
29. d serviceMmanual 125 micro inch or finer shaft finish is recommended MOUNT IN ANY POSITION Mounting Positions The backstop rotational axis must be horizontal within 5 The backstop and torque arm may be mounted at any desired angle but the position must be specified to permit furnishing of oil lines to suit the mounting Horizontal or near horizontal mounting of the torque arm provides maximum bearing life NOTE Electronic drawings are available from our Website http pt rexnord com customer support drawings 12 561 110 Rexnord Industries LLC 1979 2009 Type INRT Dimensions Millimeters AXIAL RETAINING COLLAR POSITIONS MOUNT ON EITHER SIDE 1175NRT 703 245 80 345 465 1107 442 417 584 13 130 185 610 3048 3602 363 1297 2177 A is EZ gt Y Ti Q PURCHASER TO FURNISH STOPS WLAN TN OIL LINE amp OIL LEVEL SIGHT GAGE 4 4 For Bore Keyway Sizes Tolerances Refer to Pages 18 thru 20 Max t Bore t Torque Over Ed Rating running A c D J yk L M N ps Wege Nm Speed ax rpm 1075NRT 13550 450 50 100 295 213 193 127 10 18 61 11 11 102 914 1062 158 403 10 1085NRT 21680 350 15 130 358 213 193 165 10 18 92 66 16 127 1219 1400 158 625 122 1095NRT 37940 300 85 150 391 269 249 183 10 20 81 89 91 152 1372 1
30. eered Selections Indexing applications Vertical applications or for drive arrangements not shown refer to Factory for selection A We will select a backstop for you if you furnish the following information Drive arrangement Motor nameplate hp kW Motor maximum torque as 96 of nameplate Headshaft rpm rev min diameter diameter tolerance length and key dimensions Duty cycle If available the following information when furnished may make it possible to select a smaller size backstop Brake BkW e Lift hp LKW Figure 4 Tandem motor tandem backstop dual pulley arrangement Refer to the Factory for selection Figure 2 Tandem motor single backstop arrangements A Select backstop to hold the entire system torque Figure 5 Dual motor dual backstop dual pulley Figure 3 Tandem motor tandem backstop single pulley arrangement Refer to the Factory for selection arrangements Select each backstop to hold 6096 of total system backstop torque A 8 561 110 Rexnord Industries LLC 1979 2009 Load Sharing HYDRAULIC LOAD SHARING SYSTEMS FOR LOW SPEED BACKSTOPS ON HIGH CAPACITY MATERIAL HANDLING SYSTEMS Hydraulic Load Sharing Systems have been used successfully on high capacity multi drive material handling systems to assure a balanced load on each backstop A simple hydraulic power unit with accumulator pressure switch and pressure gauges maintains s
31. ent It s an industry first and one more powerful reason why Rexnord is your ultimate bottom line value NRTH series are provided with one year warranty 2 561 110 Rexnord Industries LLC 2009 Our Falk TRUE HOLD Backstop line consists of two configurations to suit your backstopping needs Falk TRUE HOLD NRT utilizes the field proven roller ramp principle Where Used High Torques Large Bores Fully Featured How it Works RO Backstopping The inner cam which is keyed to the shaft is stopped by a spring activated wedging action forcing rollers into an angular opening between the inner cam ramps and outer race SPRING ROLLER ee ic ado TS p X Ye INNER 2 Over Running While p the over running mode the robust precision ground cylindrical rollers are centrifugally pushed against the stationary outer race of the NRT backstop This centrifugal force causes the rollers to roll versus skid or slide against the forged steel outer race extending the service life Q ROLLER BACKSTOPPING Falk TRUE HOLD NRTH utilizes a sprag design for preventing reverse rotation Where Used Lower Torques Smaller Bores Higher Speeds How it Works Backstopping The inner race which is keyed to the shaft uti lizes spring positioning sprags into a wedged position between the inner and outer race preventing the load from rotating backwards
32. er 180 mm Size 1115 Mounting Positions The backstop rotational axis must be horizontal within 5 The backstop and torque arm may be mounted at any desired angle but the position must be specified to permit furnishing of oil lines to suit the mounting Horizontal or near horizontal mounting of the torque arm provides maximum bearing life Purchaser The purchaser is responsible for assembling the backstop retaining collar when furnished oil line oil level sight gauge air vent and for furnishing the oil and the torque arm stirrup per the Rexnord service manual A 3 2 micro meter or finer shaft finish is recommended 102 257 691 3048 3683 373 1325 3005 bores over 205 mm and Size 1125 bores over 230 mm require two collars one on each side or one collar with a step in the shaft Check usable shaft length if two 2 collars are used Size 1075 with bores over 90 mm D 165 mm Size 1085 with bores over 120 mm D 183 mm G 20 mm v Size 1095 with bores over 135 mm D 234 mm G 25 mm A Size 1105 with bores over 175 mm D 267 mm G 32 mm Size 1115 with bores over 200 mm D 308 mm Size 1125 with bores over 230 mm D 345 mm O Counterbore is for manufacturing 90 i MOUNT IN ANY POSITION NOTE Electronic drawings are available from our Website http pt rexnord com customer support drawings Rexnord Industries LLC 1979 2009 561 110 13 Backstop Operation
33. igh overrunning speeds and sealed for life design minimum maintenance Figure 12 BACKSTOPPING OUTER RING SUPPORT RING P S RB D PS SPRAG 2M N LOCKING 2 DIRECTION 561 110 15 Service Parts Type NRT Backstops INTRODUCTION Give complete data shown on the Type NRT Backstop Parts backstop nameplate and name of parts required Complete ee data will assure receipt of the correct parts Part Description COVER GASKETS When end covers are removed to AID replace oil seals order new cover gaskets to prevent oil Oil Level Caine leakage Torque Arm Bearing each Oil Seal each Cover Fasteners set 1 Cover Gasket each Assembly shown includes sight gauge air vent and all piping tees and elbows required t Cover fastener two sets are required per backstop PART DESCRIPTIONS 1 End Cover 7 Roller Cage End Rings 2 11 Optional Axial Retaining Collar 13 Roller Cage Fasteners 2 Gasket 8 Inner Cam 12 Stop Lug 14 Rotation Direction Plate d ap 9 Outer Race 15 End Cover Fasteners 4 Outer Seal 10 Labyrinth Shroud 16 Torque Arm Inner Seal Not available on all sizes 17 Torque Arm Pin Rollers Dismantling Repair amp Parts Replacement WARNING DO NOT attempt to service or remove backstop before removing load An important part of the Falk NRT backstop manufacturing process is the full load and overrunning testing with specially instrumented equipment Co
34. n feed conveyor Rexnord Industries LLC 2009 REXNORD OFFERS ACCESSORIES TO MEET YOUR NEEDS RETAINING COLLARS SHAFT GUARDS Rexnord Industries LLC 2009 561 110 27 World Class Customer Service For more than 100 years the dedicated people of Rexnord have delivered excellence in quality and service to our customers around the globe Rexnord is a trusted name when it comes to providing skillfully engineered products that improve productivity and efficiency for industrial applications worldwide We are committed to exceeding customer expectations in every area of our business product design application engineering operations and customer service Because of our customer focus we are able to thoroughly understand the needs of your business and have the resources available to work closely with you to reduce maintenance costs eliminate redundant inventories and prevent equipment down time Rexnord represents the most comprehensive portfolio of power transmission and conveying components in the world with the brands you know and trust AirMax TRUE HOLD and Rexnord are registered trademarks of Rexnord Industries LLC Falk is a trademark of Rexnord All rights reserved WORLDWIDE CUSTOMER SERVICE AUSTRALIA Rexnord Australia Pty Ltd Picton New South Wales Phone 61 2 4677 3811 Fax 61 2 4677 3812 Falk Rexnord Australia Pty Ltd Broadmeadow New South Wales Phone 61 2 4962 8000 Fax 61 2
35. ngle conveyors bucket elevators used in mining grain power generation cement and aggregates TRUE HOLD NRT backstops with torque rating to 747 000 ft lb 1 012 185 Nm Increased Life Their oversized heavy duty cylindrical rollers have a wide contact area and the rolling action minimizes wear and increases performance life and reliability No Slip The instant response fail safe roller ramp stopping mechanism prevents reverse rotation and eliminates the potential for slippage protecting man machine and your entire investment Available Stock bore sizes available in 1 week or less with our premium breakdown service See Page 4 The Falk NRT backstops are furnished with the best available lubrication and lubrication sealing system in the industry Two double lip seals on both sides of the backstop assure positive lube retention The external seal grease purge feature combined with the Airmax breather prevent contamination of the generous oil supply from particulate matter and from moisture laden air 334H L IEAVY DUTY WARRANTY Factory Warranty We re so confident in the performance and reliability of these backstops that we re backing the fully featured NRT series with the best standard warranty in the business Our full 3 year Heavy Duty Warranty provides shaft to shaft protection on all Falk components including bearings and seals warranty extends for years from date of shipm
36. nsequently return NRT backstops to Rexnord for repair and tull load testing Except tor replacement of oil seals Service Manual 568 130 NRT backstops should not be dismantled or repaired in the field It seals are to be replaced it is important that the cam and roller assemblies not be removed from the outer race Removal will void applicable warranties When writing to Rexnord Service Parts Department concernin required service state nature of problem and give complete data from backstop nameplate M number size date etc Contact Gear ServiceParts rexnord com 16 561 110 Rexnord Industries LLC 1979 2009 Engineering Recommendations Backstop Applications Falk NRT and NRTH backstops are designed to prevent reverse rotation in applications such as inclined conveyors bucket elevators fans rotary pumps and kilns If local safety codes permit the backstop may pe used as a backup for a brake on those applications but NOT in people conveying systems such as elevators manlifts ski tows or ski lifts Also DO NOT use the backstop as a substitute for a brake Indexing Falk NRT and NRTH Backstops can be used for indexing service provided there is one complete revolution of the backstop N backstopping cycles Refer application data to the Factory for selection Safety Standards The backstop and normal associated equipment shaft pulleys etc involve moving parts therefore consult local state OSHA
37. op to hold the entire system torque Figure 1 Single motor single backstop arrangements Steep Slope Conveyor 200 Motor HP 180 Brake HP 150 Lift HP 20096 Stall 68 rpm rev min 4 9375 Dia Motor HP and Stall Known 200 MHP x 5250 200 68RPM 15096 20 588 lb ft Motor Torque Size 1095 NRT Brake HP Known 180 BHP x5250 200 68RPM 1509 18 529 lb ft Brake Torque Size 1095 NRT Lift HP Known 150 LHP x 5250 200 68RPM 150 15 441 Ib ft Lift Torque Size 1085 NRT Rexnord Industries LLC 1979 2009 How to Select Falk TRUE HOLD NRT amp NRTH Backstops Metric Refer to Page 24 for explanation of terms and Page 4 for How to Order 1 Determine Drive Arrangements from Page 8 2 Determine System Torque Fig 1 Single motor Single backstop arrangements Fig 2 Tandem motor single backstop arrangements Fig 3 Tandem motor tandem backstop arrangements Figs 4 and 5 Refer these arrangements to Factory for selection Combine the kilowatts from both motors for Fig 2 and Fig 3 System Torque 9550 MKW or BkW or LkW rom rev min MkW Motor s Nameplate kW BkW Brake kW Calculated Load Use only if more than 75 of motor rating LkW Lift kW Calculated Power to Lift the Load Vertically Use only it more than 75 of motor rating kW can be calculated as follows Metric Tons per Hour TPH x Lift in Meters 5150 3 Determine
38. responsible for assembling the horizontal within 5 backstop air vent and torque arm 125 micro inch 3 2 micro meters or finer shaft finish is recommended The backstop and torque arm may be mounted at any desired angle Horizontal or near horizontal mounting of the torque arm provides maximum bearing life NOTE Electronic drawings are available from our Website http pt rexnord com customer support drawings 10 561 110 Rexnord Industries LLC 1979 2009 Type NRTH Style C H S Applications Dimensions Inches amp Millimeters o 180 amp 0 I PREFERRED r 180 cU 7777771109 TORQUE ARM CAN GO ON EITHER SIDE B gt BREATHER VENT DIRECTION OF FREE ROTATION ARROW PURCHASER TO FURNISH EITHER STIRRUP OR ANCHOR PIN F lt BACKSTOP SHOWN 180 MOUNTING POSITION 4 SETSCREWS FOR AXIAL RETENTION Dimensions Inches Backstop lore Speed Range Bore x E i K W ely lp TorqueArm Size Min Max Min Max A Fasteners Ib 1055 4 400 320 12100 1 75 3 75 1065 8 400 250 11 800 2 50 4 50 1 518 14 7 5011 125 2 00 36 00 8 50 0 625 400 4 00 1 25 0 63 6 53 048 142 88 5 50 8 1 2 20 X2 0 LG 157 018 64 18 0011 125 2 00 136 001 925 10 6251 400 4 00 1 25 0 63 7 03 0 48 143 251 5 88 8 1 2 20 X2 0 LG 190 C o 1 s
39. s LLC 2009 Selection Guide 561 110 February 2009 Table of Contents Comparison of NRT amp 3 eS eu uu LAN qoaa de rte 4 HOW TO Order Less ac tene ARE Et RS Sais 4 Desire Into MONO Maw sce ia esten se gocce es Sour ue 9 How to Select Falk NRT amp NRTH Backstops 6 7 Common Drive 8 FOGG GUN RETE TT T TO D C aah TE E 9 OMG Cope sre adc Mea aus duties 10 13 B cksiop nares cec A aoe S dex S Per eoe dones 14 S15 RAI AIME CR tum aan hoes Oe ae 16 Engineering Recommendations 17 21 Competitive Interchangeability 22 23 Backstop Selection Procedure Definitions 24 due 25 Typed Applications URL 26 27 Copyright 1979 2009 Rexnord Industries LLC All Rights Reserved Litho in U S A Airmax Rexnord and TRUE HOLD are registered trademarks Falk and Magnum Seal are trademarks of Rexnord Viton is a registered trademark of the DuPontCo The contents of this selection guide are subject to change without notice or obligation Information contained herein should be confirmed before placing orders Rexnord Industries LLC 1979 2009 Basic Information Safety Notes Install and operate Rexnord products in conformance with applicable local and national safety codes
40. s stall torque capacity NRT NRTH Backstop Order Information Required or previous Falk M O Number Size Quantity Backstop Rotation CW or CCW Shaft Diameter and Tolerance mm or inches Available Shaft Length mm or inches Kwy X mm or inches Power Indicate kW or Hp Lift Demand or Motor RPM of Shaft that Backstop is Mounted upon Motor Stall Torque or Max Overload Torque Stall Torque Number of Retaining Collars NOTE Provide information above plus a drive layout schematic for multiple pulley applications 4 561 110 Stock Bore Size NRT SIZE 1075 3 4375 1075 3 9375 1085 4 4375 130 1085 4 9375 1095 4 9375 150 1095 9 4375 1105 9 9375 200 1105 6 9375 1115 6 9375 220 1115 7 4375 1115 5939 5 1115 8 000 1115 8 4375 1125 8 5000 240 1125 8 9375 1125 9 0000 1135 10 5000 260 1145 300 1155 350 Torque Arm Position in Degrees See illustrations on Pages 10 13 If Non Std Torque Arm advise N dim Pages 12 amp 13 inches or mm The bore sizes listed above can ship from stock in one week Metric Backstops supplied with E7 bore and D10 keyway assuming m6 shaft diameter and h9 keyway ISO tolerance specification Inch Backstops supplied with H7 bore assuming h6 shaft ANSI tolerance specification Backstop key and keyway tolerance per FDN 430 152 assuming shaft keyway per ANSI B17 1 Rexnord Industrie
41. to start equipment Also called locked rotor torque Torque required to stop motor rotor from operating and is generally caused by overload conditions Maximum torque the motor produces at about 7596 of speed Horsepower kilowatts supplied to drive pulley One drive pulley provides all power to conveyor Tandem Motor Drive Tandem Pulley Drive Dual Pulley Drive Headshaft Indexing Jogging Backstop Terms Backstop Rating Backstop load Backstop operation Tandem Backstops Dual Backstops Two motors driving one drive pulley drive Two pulleys are used to power conveyor but are driven by one motor through a dual output drive arrangement This is not commonly used today Two pulleys are used to power conveyor and each pulley is driven by a separate motor s Shaft on which drive pullely is mounted Continuous cyclic or periodic applications of the backstop as encountered in the conversion of reciprocating or oscillating motion into intermittent linear motion Stop start movement with jerking or jolting motion Catalog torque rating Load applied to the backstop of backstop rollers and outer race Two backstops on the same drive pulley Two backstops on the same conveyor but each on separate drive pulley Rexnord Industries LLC 1979 2009 sts Ev ery Falk NRT Befo re Shi TRU Full L E HOLD Load Lo Tested i Speed B ud ee eee rori re ance m
42. ts bending strength of torque arm and hoop stress of outer race Rexnord Industries LLC 1979 2009 Backstop Operation NRTH Styles B and C The NRTH styles B and C backstops are a new addition to the Rexnord line of backstops These backstops operate on the proven principal of sprag technology which has been around since the mid 1950 s The sprag technology has advanced over the years with improvements in materials and heat treatment processes NRTH Style B The NRTH Style B backstops are designed for lower operating speed applications The design features three primary components a cylindrical inner race a cylindrical outer race and a sprag cage consisting of a full complement of individually tensioned sprags 1055 1065 and 1085 ONLY Figure 10 BREATHER VENT 1055 1065 and 1085 ONLY DIRECTION OF FREE ROTATION ARROW PURCHASER TO FURNISH EITHER STIRRUP OR ANCHOR PIN BACKSTOP SHOWN AT 180 MOUNTING POSITION NRTH Style C The NRTH Style C backstops are offered in sizes 1055 and 1065 and are designed for a higher operating speed than the Style B The centrifugal litt off sorag is a feature exclusive to the NRTH Style C design in the NRT family ot Rexnord backstops This feature incorporates a special spra sel with an offset center of gravity During overrunning centrifugal force causes the individually tensioned sprags to lift off the outer race thereby allowing the Figure 11 OVERRUNNING LIFT
43. verse the inner cam is instantly stopped by the wedging action of the rollers in the annular openings between the cam ramps and outer race From the outer race the SEIS torque is carried through the end covers to the torque arm and the adjoining superstructure Figure 9 All rollers are engaged simultaneously since they are positioned by the spring loaded roller cage Load division between the rollers is assured by machining accuracy of the inner cam ramps rollers roller cage and outer race Figure 7 ROLLERLIFT OFF CENTRIFUGAL FORCE FRICTION SPRING FORCE ps PLIS ILES 06 OVERRUNNING ROTATION Figure 9 STATIONARY OUTERRACE SPRING AS Ds pum SS CAGE NY EE 4 DS A AALL i ROLLER BACKSTOPPING TOP LUG As additional backstopping torque is applied to the inner cam the rollers will tend to move deeper into the wedging position thereby increasing the resistance to slippage Relative rotational movement between initial backstopping engagement at no load to backstopping at full catalog rating is approximately 1 5 to 3 The torque capacity of the backstop is based on the tangential friction resistance force at the outer race developed by the compressive force between the inner cam ramps rollers and outer race The maximum torque capacity of the backstop is limited by the Hertzian contact stress at inner cam roller and roller outer race contact poin
44. y the Factory to suit shaft and backstop keyways Keys are either cold drawn 1045 or heat treated alloy steel 310 350 HB Only use keys furnished by the Factory Shaft keyway depth tolerance of 000 010 is recommended t Number 1 keys are cold drawn 1045 steel Number 2 keys are heat treated alloy steel 310 350 HB and Number 3 keys are Mild Steel Backstop supplied with H7 bore assuming h shaft ANSI tolerance specification Backstop key and keyway tolerance per FDN 430 152 assuming shaft keyway per ANSI B17 1 18 561 110 Rexnord Industries LLC 1979 2009 Engineering Recommendations Table 1A Shaft and Keyway Dimensions Millimeters Shaft Keyway Backstop Keyway Key in Nominal Shaft BACKSTOP Diameter SIZE Key Length Minimum Key Key x omm Mh o O ow oeh Material 1045NRTH 45 50 14 0 5 5 14 0 3 8 14X9 88 9 66 7 3 50 58 16 0 6 0 16 0 4 3 16 X10 88 0 66 7 3 7 0 2 3 18 X9 88 0 66 7 3 1055NRTH 5 8 3 0 3 3 0 4 3 5 9 3 0 4 3 0 4 3 0 2 3 1065NRTH 5 9 3 0 4 3 0 4 3 0 4 3 0 5 3 1085 100 110 28 0 0 4 28 X16 193 7 149 2 3 110 130 32 0 11 0 4 32 X18 193 7 149 2 3 130 140 36 0 12 0 8 36 X15 193 7 149 2 3 1075NRT 50 3 2 4 9 2 4 2 2 2 1085NRT 15 9 0 2 9 0 2 0 0 2 1 0 1095NRT 9 0 2 9 0 2 10 0 2 11 0 12 0 2 1105NRT 120 130 11 0 2 130 150 12 0 2
45. ystem pressure in a pre determined range to meet the backstopping requirements of the material handling system Typical installations are dual pulley quad drive installations employing motors of 1000 HP 750 kW or larger The Hydraulic Load Sharin System not only balances the load on each backstop it also extends the capability of the NRT Backstop range by eliminating the need to assume unbalanced load distribution in the selection process due to variances in system backlash and component stiffness The design of the Hydraulic Load Sharing Backstopping Systems utilizes NRTs of s capacity mounted on pulleys of equal diameter Hydraulic cylinders of equal cylinder area are placed at equal distances from the centerline of each pulley under their respective NRT torque arms A hydraulic charge pump delivers system oil pressure to hydraulic piping that is interconnected ie oil pressure in the interconnected hydraulic piping is equal so the pistons are subjected to equal pressure Equal pressure applied to hydraulic cylinders with equal cylinder area creates an equal amount of force to each torque arm Equal force on the torque arms at equal distances from the centerline of the pulleys produces equal narei pong torque at each pulley Therefore you achieve balance loading Rexnord Geared Products Group also has the experience and expertise to select and apply Gear Drive Systems with mechanical load sharing backstops Contact Rexnord for assistance
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