SLEW DRIVES Cat WGRS 2011a
About QCB Bearings QCB is a registered trade name of the NBC Group Ltd under which high quality bearings and other products are sourced from ISO registered factories worldwide. The QCB mark means that our engineers have vetted and quality audited the suppliers to ensure that you receive a high quality product. The QCB range currently includes: Deep groove radial ball bearings Large size spherical roller bearings Large size cylindrical roller bearings Thermoplastic housed bearing units for the food industry Slewing rings Orleton Lane, Wellington, Telford, TF1 2BG, Shropshire, England Phone: +44 (0) 1952 222300 Fax: +44 (0) 1952 242938 Page 2
Slew drive styles QCB Slew Drives are available in 4 basic styles, and feature an hour glass shaped worm shaft engaging a helical gear for a more positive tooth engagement compared to some systems resulting in increased rive torque and smoother rotation. 1. Open housing slew drive 2. Enclosed slew drive 3. Open dual drive system 4. Enclosed dual drive system Page 3
Installation & Maintenance Instructions Transport, handling and storage Large slewing rings usually have lifting holes for eye bolts to assist lifting in the inner and outer rings. Check the weight of the ring to ensure slings and/or chains are of sufficient capacity! Slewing rings should be transported and stored in a horizontal position or on specially built incline cradles. Shock loads must be avoided as this may damage the raceways. If stacked on a pallet then care must be taken not to dislodge seals or grease fittings during movement. Wooden or rubber spacers would be of benefit between each bearing. External gear teeth should be protected from any impact damage. As supplied slewing rings are generally packed for storage in a covered store and for a period not exceeding 6 months. Light surface corrosion can usually be removed from exterior surfaces it s more important that the raceways are well greased and rust free. In extreme cases after long term storage bearings may need professionally reconditioning. When unwrapping, care must be taken not to cut and damage the integral seals. Standard commercial solvents can be used to degrease the slewing ring if necessary. Supporting surfaces The supporting surfaces must have a flat machined surface and be rigid enough to eliminate torsional buckling under load that would affect the smooth operation of the slewing ring. The thickness of the supporting plates should be no less than that indicated below which is an approximation only! Definitive results can best be achieved with Finite Element Analysis. Raceway diameter (mm) 500 750 1000 1250 Min. Support Thickness (mm) 25 30 35 40 The width of the supporting surface must at least be equal to the width of the ring it supports. Page 4
The flatness defects under load must not exceed the values indicated below to avoid tight spots or seizure; both of which will reduce slewing ring bearing service life. Raceway diameter (mm) >100 >250 >500 >750 >1000 >1250 Max. allowable flatness defect (mm) 0.04 0.06 0.08 0.09 0.10 0.11 In the unlikely event that these flatness tolerances cannot be met, epoxy resins can be used. NBC recommends CHOCKFAST Orange for this application. Call NBC Technical for further details. In the event of high radial loads, then the circularity of the slewing ring may be affected. If circularity cannot be maintained by use of the machined step on at least one of the machined diameters of the bearing, then a system of dowel pins through the rings might be considered after consultation with NBC Technical. Page 5
Fastening bolts Grade 10.9 bolts must be used. Check you have the right grade! Untreated bolts should be lightly oiled and tightened progressively using a calibrated torque wrench or a hydraulic system (large sizes), moving around the slewing ring periphery in 120 steps or according to the chart below. Bolts should be fitted to all bolt holes provided. Page 6
The recommended tightening torque figures are tabulated below. Only flat, hardened washers may be used. Never use flexible or serrated washers as this will void any manufacturer s warranty. The specific pressure underneath the bolt head must not exceed the limit for the material. The slewing ring should be rotated during the tightening process as this will indicate the development of any tight spots, the cause of which must be investigated. The bolt torque should be checked before the machine is finally operated to check for any loss of pre load due to the structure settling, after 100 hours of operation and annually thereafter. Slewing rings should never be fixed by welding, nor should welding processes be carried out nearby. Care must be taken not to earth through the slewing ring as this may damage the raceways permanently. Page 7
Orientation of the slewing ring Slew drive slewing rings have a filling plug on the inner diameter face. The filling plug is usually in the same place as the start/finish of the hardening path (which should never overlap). This hardness gap is usually indicated by the letter S stamped on the ring. The filler plug or S stamping should always be placed at the point of minimum strain (for example at right angles to the main load axis). Operational bearing clearance After assembly the clearance or total deflection in the bearing under a known load must be measured as this will serve as a reference point for later clearance checks that will be made to determine the amount of wear in the bearing. Measurements must be taken as close to the raceway as possible to minimize elastic deflections in the structure. As a rule of thumb, once the measured clearance exceeds 4 times the initial measured clearance the bearing should be reconditioned or replaced. Consult NBC Technical. Raceway lubrication During assembly of the machine ensure that the grease nipples are easily accessible or run supplementary greasing lines. Although bearings will always be factory filled with grease, it is considered standard practice to lubricate a new bearing during fitting. Any standard lithium or lithium calcium NLGI 2 grease with EP additives is usually suitable. Typical lubricants include: Brand Bearing/Raceway grease Operating temp range ARAL Aralub HLP2 30 C to + 120 C BECHEM Rhus L474/2 or High Lub L 2 EP 20 C to + 120 C BP Energrease LS EP 2 20 C to + 120 C ESSO Beacon EP 2 20 C to + 120 C TOTAL FINA ELF Multis EP2 or Lical EP2 30 C to + 120 C EXXONMOBIL Mobilith SHC 460 30 C to + 130 C KLUBER Centoplex 2 EP 20 C to + 130 C RHENUS Norlith MZP 2 30 C to + 130 C SHELL Retina EP2 or Alvania EP (LF) 2 25 C to + 130 C FUCHS Stabyl LT 50 50 C to + 130 C Page 8
Bearings should be relubricated every 50 100 hours of operation but more frequently for operation in adverse environmental conditions. Environmental conditions Dry & clean workshop Outside/ Exposed Aggressive environment Extreme conditions Recommended relube interval ~ 300 operating hours or 6 months ~ 100 200 operating hours or 4 months ~ 50 hours or 2 months ~ continuous lubrication preferred After any long period of idleness the bearing should be relubricated. Grease should be pumped in whole the bearing is turned. Excess grease will weep out from under the seals. Care must be taken not to overpressure the bearing which may pop the seal. If this occurs, the seal must be re seated before machine operation. Gear lubrication The gear should be lubricated immediately after assembly. Suitable open gear grease should be brushed or sprayed on to cover the teeth completely. Brand Gear grease Operating temp range ARAL Aralub LFZ 1 20 C to + 120 C BECHEM Berulit GA 400 20 C to + 180 C BP Energol WRL 20 C to + 120 C TOTAL FINA ELF Cardrexa DC1 20 C to + 125 C EXXONMOBIL Mobiltac 81 20 C to + 120 C KLUBER Grafloson CA 901 20 C to + 180 C RHENUS Norplex AKG 0 20 C to + 200 C SHELL Aeroshell Grease 14 54 C to + 93 C Page 9
Slew drive numbering system The QCB Slew Drive numbering system is best illustrated by way of example WGSE 14 85 B H 2 R 160 WGSE WGS 160 Hydr R Hydraulic motor m L Hydraulic motor m Single worm shaft 2 Dual worm shaft Capped end (opposite motor) H Hexagon shaft end E Encoder Omitted if hydraulic motor fitted B SAE 6B spline 12 12mm keyed shaft 16 16mm keyed shaft 25 25mm keyed shaft 85 Reduction ratio 14 PCD of raceway in inches Enclosed slew drive Open slew drive Page 10
Glossary of terms AXIAL LOAD RADIAL LOAD MOMENT LOAD SELF LOCKING HOLDBACK TORQUE GEAR EFFICIENCY OUTPUT TORQUE STATIC AXIAL LOAD STATIC RADIAL LOAD DYNAMIC AXIAL LOAD DYNAMIC RADIAL LOAD The bearing load perpendicular to the raceway (KN) The bearing load parallel to the raceway (KN) The overturning load on the bearing raceway (KNm) The slewing ring cannot be driven backwards by the load The maximum torque the gearing will resist if driven backwards by the load (KNm). Exceeding this figure will result in severe damage to the bearing. The 3 7 systems are 30% efficient; 9 25 are 40% efficient The maximum torque available to turn the load (KNm) Maximum bearing raceway axial load (KN) Maximum bearing raceway radial load (KN) Raceway basic dynamic axial load (for life calculations) (KN) Raceway basic dynamic radial load (for life calculations) (KN) QCB Slew Drives are all painted blue (RAL 5005) by default, although other colours are available on request (and for volume). Page 11
WGSE3 / WGSE5 Slew drives WGSE 3 WGSE 5 Static load ratings Dynamic load ratings Moment Output Holdback Axial Radial Axial Radial load torque torque 30 KN 16.6 KN 9.6 KN 8.4 KN 1.1 KNm 0.4 KNm 2 KNm 6744 lbf 3732 lbf 2158 lbf 1888 lbf 811 lbf.ft 295 lbf.ft 1475 lbf.ft 76 KN 22.6 KN 13.8 KN 11.8 KN 1.8 KNm 0.6 KNm 5 KNm 17085 lbf 5081 lbf 3102 lbf 2653 lbf 1328 lbf.ft 443 lbf.ft 3688 lbf.ft Gear ratio Accuracy Self locking Weight WGSE 3 WGSE 5 62:1 < 0.2 o YES 12 kg 62:1 < 0.2 o YES 12 kg Page 12
WGSE7 / WGS7 Slew drives WGSE 7 WGS 7 Static load ratings Dynamic load ratings Moment Output Holdback Axial Radial Axial Radial load torque torque 133 KN 53 KN 32 KN 28 KN 13.5 KNm 1 KNm 10.4 KNm 29900 lbf 11915 lbf 7194 lbf 6295 lbf 9957 lbf.ft 738 lbf.ft 7671 lbf.ft 133 KN 53 KN 32 KN 28 KN 13.5 KNm 1 KNm 10.4 KNm 29900 lbf 11915 lbf 7194 lbf 6295 lbf 9957 lbf.ft 738 lbf.ft 7671 lbf.ft Gear ratio Accuracy Self locking Weight WGSE 7 WGS 7 73:1 < 0.2 o YES 21 kg 73:1 < 0.2 o YES 16 kg Page 13
WGSE9 / WGS9 Slew drives WGSE 9 WGS 9 Static load ratings Dynamic load ratings Moment Output Holdback Axial Radial Axial Radial load torque torque 338 KN 135 KN 81 KN 71 KN 33.9 KNm 6.5 KNm 38.7 KNm 76000 lbf 30000 lbf 18000 lbf 16000 lbf 25000 lbf.ft 4794 lbf.ft 29000 lbf.ft 338 KN 135 KN 81 KN 71 KN 33.9 KNm 6.5 KNm 38.7 KNm 76000 lbf 30000 lbf 18000 lbf 16000 lbf 25000 lbf.ft 4794 lbf.ft 29000 lbf.ft Gear ratio Accuracy Self locking Weight WGSE 9 WGS 9 61:1 < 0.17 o YES 49 kg 61:1 < 0.17 o YES 37 kg Page 14
WGSE12 / WGS12 Slew drives WGSE 12 WGS 12 Static load ratings Dynamic load ratings Moment Output Holdback Axial Radial Axial Radial load torque torque 475 KN 190 KN 114 KN 100 KN 54.3 KNm 7.5 KNm 43 KNm 107000 lbf 43000 lbf 26000 lbf 23000 lbf 40000 lbf.ft 5532 lbf.ft 32000 lbf.ft 475 KN 190 KN 114 KN 100 KN 54.3 KNm 7.5 KNm 43 KNm 107000 lbf 43000 lbf 26000 lbf 23000 lbf 40000 lbf.ft 5532 lbf.ft 32000 lbf.ft Gear ratio Accuracy Self locking Weight WGSE 12 WGS 12 78:1 < 0.17 o YES 61 kg 78:1 < 0.17 o YES 41 kg Page 15
WGSE14 / WGS14 Slew drives WGSE 14 WGS 14 Static load ratings Dynamic load ratings Moment Output Holdback Axial Radial Axial Radial load torque torque 555 KN 222 KN 133 KN 117 KN 67.8 KNm 8 KNm 48 KNm 125000 lbf 50000 lbf 30000 lbf 26000 lbf 50000 lbf.ft 5900 lbf.ft 35000 lbf.ft 555 KN 222 KN 133 KN 117 KN 67.8 KNm 8 KNm 48 KNm 125000 lbf 50000 lbf 30000 lbf 26000 lbf 50000 lbf.ft 5900 lbf.ft 35000 lbf.ft Gear ratio Accuracy Self locking Weight WGSE 14 WGS 14 85:1 < 0.17 o YES 64 kg 85:1 < 0.17 o YES 47 kg Page 16
WGSE14 2 / WGS14 2 Slew drives WGSE 14 2 WGS 14 2 Static load ratings Dynamic load ratings Moment Output Holdback Axial Radial Axial Radial load torque torque 555 KN 222 KN 133 KN 117 KN 67.8 KNm 12 KNm 48 KNm 125000 lbf 50000 lbf 30000 lbf 26000 lbf 50000 lbf.ft 8851 lbf.ft 35000 lbf.ft 555 KN 222 KN 133 KN 117 KN 67.8 KNm 12 KNm 48 KNm 125000 lbf 50000 lbf 30000 lbf 26000 lbf 50000 lbf.ft 8851 lbf.ft 35000 lbf.ft Gear ratio Accuracy Self locking Weight WGSE 14 2 WGS 14 2 85:1 < 0.17 o YES 76 kg 85:1 < 0.17 o YES 62 kg Page 17
WGSE17 / WGS17 Slew drives WGSE 17 WGS 17 Static load ratings Dynamic load ratings Output Holdback Moment load Axial Radial Axial Radial torque torque 970 KN 390 KN 235 KN 205 KN 135.6 KNm 10 KNm 72.3 KNm 218000 lbf 88000 lbf 53000 lbf 46000 lbf 100000 lbf.ft 7400 lbf.ft 53000 lbf.ft 970 KN 390 KN 235 KN 205 KN 135.6 KNm 10 KNm 72.3 KNm 218000 lbf 88000 lbf 53000 lbf 46000 lbf 100000 lbf.ft 7400 lbf.ft 53000 lbf.ft Gear ratio Accuracy Self locking Weight WGSE 17 WGS 17 102:1 < 0.15 o YES 105 kg 102:1 < 0.15 o YES 87 kg Page 18
WGSE17 2 / WGS17 2 Slew drives WGSE 17 2 WGS 12 Static load ratings Dynamic load ratings Output Holdback Moment load Axial Radial Axial Radial torque torque 970 KN 390 KN 235 KN 205 KN 135.6 KNm 16.8 KNm 72.3 KNm 218000 lbf 88000 lbf 53000 lbf 46000 lbf 100000 lbf.ft 12391 lbf.ft 53000 lbf.ft 970 KN 390 KN 235 KN 205 KN 135.6 KNm 16.8 KNm 72.3 KNm 218000 lbf 88000 lbf 53000 lbf 46000 lbf 100000 lbf.ft 12391 lbf.ft 53000 lbf.ft Gear ratio Accuracy Self locking Weight WGSE 17 2 102:1 < 0.15 o YES 119 kg WGS 17 2 102:1 < 0.15 o YES 102 kg Page 19
WGSE21 / WGS21 Slew drives WGSE 21 WGS 21 Static load ratings Dynamic load ratings Output torque Holdback torque Axial Radial Axial Radial Moment load 1598 KN 640 KN 385 KN 335 KN 203 KNm 15 KNm 105.8 KNm 359000 lbf 144000 lbf 87000 lbf 75000 lbf 150000 lbf.ft 11000 lbf.ft 78000 lbf.ft 1598 KN 640 KN 385 KN 335 KN 203 KNm 15 KNm 105.8 KNm 359000 lbf 144000 lbf 87000 lbf 75000 lbf 150000 lbf.ft 11000 lbf.ft 78000 lbf.ft Gear ratio Accuracy Self locking Weight WGSE 21 125:1 < 0.15 o YES 149 kg WGS 21 125:1 < 0.15 o YES 132 kg Page 20
WGSE21 2 / WGS21 2 Slew drives WGSE 21 2 WGS 21 2 Static load ratings Dynamic load ratings Output torque Holdback torque Axial Radial Axial Radial Moment load 1598 KN 640 KN 385 KN 335 KN 203 KNm 20.6 KNm 105.8 KNm 359000 lbf 144000 lbf 87000 lbf 75000 lbf 150000 lbf.ft 15194 lbf.ft 78000 lbf.ft 1598 KN 640 KN 385 KN 335 KN 203 KNm 20.6 KNm 105.8 KNm 359000 lbf 144000 lbf 87000 lbf 75000 lbf 150000 lbf.ft 15194 lbf.ft 78000 lbf.ft Gear ratio Accuracy Self locking Weight WGSE 21 2 125:1 < 0.15 o YES 161 kg WGS 21 2 125:1 < 0.15 o YES 143 kg Page 21
WGSE25 / WGS25 Slew drives WGSE 25 WGS 25 Static load ratings Dynamic load ratings Output torque Holdback torque Axial Radial Axial Radial Moment load 2360 KN 945 KN 590 KN 470 KN 271 KNm 18 KNm 158.3 KNm 531000 lbf 212000 lbf 133000 lbf 106000 lbf 200000 lbf.ft 13300 lbf.ft 117000 lbf.ft 2360 KN 945 KN 590 KN 470 KN 271 KNm 18 KNm 158.3 KNm 531000 lbf 212000 lbf 133000 lbf 106000 lbf 200000 lbf.ft 13300 lbf.ft 117000 lbf.ft Gear ratio Accuracy Self locking Weight WGSE 25 150:1 < 0.15 o YES 204 kg WGS 25 150:1 < 0.15 o YES 186 kg Page 22
WGSE25 2 / WGS25 2 Slew drives WGSE 25 2 WGS 25 2 Static load ratings Dynamic load ratings Output torque Holdback torque Axial Radial Axial Radial Moment load 2360 KN 945 KN 590 KN 470 KN 271 KNm 28 KNm 158.3 KNm 531000 lbf 212000 lbf 133000 lbf 106000 lbf 200000 lbf.ft 20652 lbf.ft 117000 lbf.ft 2360 KN 945 KN 590 KN 470 KN 271 KNm 28 KNm 158.3 KNm 531000 lbf 212000 lbf 133000 lbf 106000 lbf 200000 lbf.ft 20652 lbf.ft 117000 lbf.ft Gear ratio Accuracy Self locking Weight WGSE 25 2 150:1 < 0.15 o YES 222 kg WGS 25 2 150:1 < 0.15 o YES 202 kg Page 23
Hydraulic motors / DC and AC motors Displacement Speed Torque Output power Pressure Flow Weight Dimension L cm 3 /rev rpm Nm KW Mpa l/min kg mm BMRS36 36 1085 69 7.5 14 40 6.7 141 BMRS50 51.3 755 100 7.7 14 40 6.7 144 BMRS80 80.6 750 160 12.3 14 60 6.9 150 BMRS100 100.8 600 200 12.3 14 60 6.9 154 BMRS125 124.9 475 250 12 14 60 7.2 159 BMRS160 157.2 375 320 12.3 14 60 7.5 165.5 BMRS200 199.2 300 330 10 12 60 8 174 BMRS250 252 240 352 9 11 60 8.5 184 BMRS315 314.5 190 360 7 8.5 60 9 196 BMRS375 370 160 420 6.5 8.5 60 9.3 208 Voltage Current Gear ratio Speed Rated output torque V A rpm Nm 24/860/25 24 DC <17 32:1 86 25 220/1270/15 220 AC <0.8 11:1 127 15 380/780/64 380 AC 2 36:1 78 64 Page 24
Future developments Please refer all enquiries to technical@nbcgroup.co.uk WGHSE Single and double worm systems Developed for use in multi axle, heavy lift transporters Spur drive systems A standard spur gear slewing ring mounted on a plate with integral planetary gearing system Only available for volume /OEM users at this stage. Solar tracking systems A full range of small high precision units is available for solar tracking systems, including duplex units that control azimuth and elevation axes. A range of motors and gearboxes including DC motors, brushless motors, 380V AC motors can be supplied to customer requirements. Page 25