cat wgrs2011a cover1 - f.jernindustri.dkf.jernindustri.dk/2jfmev5kynbxveda.pdf · grade 10.9 bolts...

Cat WGRS 2011a

www.nbcgroup.co.uk

SSLLEEWW DDRRIIVVEESS

QCB Slew drives CAT WGRS2011a

Page | 2 www.nbcgroup.co.uk

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

www.nbcgroup.co.uk



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



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.



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.



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.



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.



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



Bearings should be relubricated every 50‐100 hours of operation but more frequently for operation in adverse environmental conditions.

Environmental conditions Recommended relube interval

Dry & clean workshop ~ 300 operating hours or 6 months

Outside/ Exposed ~ 100‐200 operating hours or 4 months

Aggressive environment ~ 50 hours or 2 months

Extreme conditions ~ 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



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 ‐

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

WGSE Enclosed slew drive

WGS Open slew drive



Glossary of terms

AXIAL LOAD The bearing load perpendicular to the raceway (KN)

RADIAL LOAD The bearing load parallel to the raceway (KN)

MOMENT LOAD The overturning load on the bearing raceway (KNm)

SELF LOCKING The slewing ring cannot be driven backwards by the load

HOLDBACK TORQUE 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.

GEAR EFFICIENCY The 3‐7” systems are 30% efficient; 9‐25” are 40% efficient

OUTPUT TORQUE The maximum torque available to turn the load (KNm)

STATIC AXIAL LOAD Maximum bearing raceway axial load (KN)

STATIC RADIAL LOAD Maximum bearing raceway radial load (KN)

DYNAMIC AXIAL LOAD Raceway basic dynamic axial load (for life calculations) (KN)

DYNAMIC RADIAL LOAD 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).



WGSE3 / WGSE5 Slew drives

Axial Radial Axial Radial

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.ftWGSE 5

62:1 < 0.2o YES 12 kg

WGSE 3

WGSE 5

Model AccuracySelf

locking Weight

Model

62:1 < 0.2o YES 12 kg

WGSE 3

Static load ratings Dynamic load ratings Moment

load

Output

torque

Holdback

torque

Gear ratio



WGSE7 / WGS7 Slew drives


133 KN 53 KN 32 KN 28 KN 13.5 KNm 1 KNm 10.4 KNm




WGSE 7

WGS 7

WGS 7

73:1 < 0.2o YES 16 kg

Model Gear ratio AccuracySelf

locking Weight

WGSE 7

73:1 < 0.2o YES 21 kg

ModelStatic load ratings Dynamic load ratings Moment

load

Output

torque

Holdback

torque





338 KN 135 KN 81 KN 71 KN 33.9 KNm 6.5 KNm 38.7 KNm




WGSE 9

WGS 9

WGS 9

61:1 < 0.17o YES 37 kg


locking Weight

WGSE 9

61:1 < 0.17o YES 49 kg


load

Output

torque

Holdback

torque





475 KN 190 KN 114 KN 100 KN 54.3 KNm 7.5 KNm 43 KNm


475 KN 190 KN 114 KN 100 KN 54.3 KNm 7.5 KNm 43 KNm


WGSE 12

WGS 12

WGS 12

78:1 < 0.17o YES 41 kg


locking Weight

WGSE 12

78:1 < 0.17o YES 61 kg


load

Output

torque

Holdback

torque





555 KN 222 KN 133 KN 117 KN 67.8 KNm 8 KNm 48 KNm




WGSE 14

WGS 14

WGS 14

85:1 < 0.17o YES 47 kg


locking Weight

WGSE 14

85:1 < 0.17o YES 64 kg


load

Output

torque

Holdback

torque



WGSE14‐2 / WGS14‐2 Slew drives






WGSE 14‐2

WGS 14‐2

WGS 14‐2

85:1 < 0.17o YES 62 kg


locking Weight

WGSE 14‐2

85:1 < 0.17o YES 76 kg


load

Output

torque

Holdback

torque









WGSE 17

WGS 17

WGS 17

102:1 < 0.15o YES 87 kg


locking Weight

WGSE 17

102:1 < 0.15o YES 105 kg

ModelStatic load ratings Dynamic load ratings

Moment loadOutput

torque

Holdback

torque









WGS 17‐2 102:1 < 0.15o YES 102 kg

Weight

WGSE 17‐2 102:1 < 0.15o YES 119 kg

WGSE 17‐2

WGS 12


locking


Moment loadOutput

torque

Holdback

torque





1598 KN 640 KN 385 KN 335 KN 203 KNm 15 KNm 105.8 KNm




WGS 21 125:1 < 0.15o YES 132 kg

Weight

WGSE 21 125:1 < 0.15o YES 149 kg

WGSE 21

WGS 21


locking


Moment loadOutput

torque

Holdback

torque





1598 KN 640 KN 385 KN 335 KN 203 KNm 20.6 KNm 105.8 KNm


1598 KN 640 KN 385 KN 335 KN 203 KNm 20.6 KNm 105.8 KNm


WGS 21‐2 125:1 < 0.15o YES 143 kg

Weight

WGSE 21‐2 125:1 < 0.15o YES 161 kg

WGSE 21‐2

WGS 21‐2


locking


Moment loadOutput

torque

Holdback

torque









WGS 25 150:1 < 0.15o YES 186 kg

Weight

WGSE 25 150:1 < 0.15o YES 204 kg

WGSE 25

WGS 25


locking


Moment loadOutput

torque

Holdback

torque









WGS 25‐2 150:1 < 0.15o YES 202 kg

Weight

WGSE 25‐2 150:1 < 0.15o YES 222 kg

WGSE 25‐2

WGS 25‐2


locking


Moment loadOutput

torque

Holdback

torque



Hydraulic motors / DC and AC motors

Displacement Speed TorqueOutput

powerPressure Flow Weight

Dimension

L

cm3/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

Model

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

Model



Future developments

Please refer all enquiries to [email protected]

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.

cat wgrs2011a cover1 - f.jernindustri.dkf.jernindustri.dk/2jfmev5kynbxveda.pdf · grade 10.9 bolts...

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