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Salient Features Hardened and profile ground gears Unicast case with 3-point mounting Dry well arrangement Pumpless lubrication
Greaves “GA” series parallel shaft vertical gear drives in
triple reduction are intended to satisfy characteristic
requirements and conditions encountered in Aerator
application. The series covering sizes from 112 to 250
with ratio range of 25.6 : 1 to 42.5 : 1 in triple stage are
exclusively meant for Aerator drives with essential
features like uni-cast case, 3-point mounting, pumpless
lubrication and drywell arrangement. The units are
supplied with suitable motor mounting adaptors, flexible
coupling on input and rigid coupling on output (optional)
corresponding to specific requirements. This catalogue
contains specifications, dimensions and ratings for
selection of standard gear drives against usual
applications. Our engineers will be pleased to assist in
case of unusual conditions attracting special
requirements. GR
EA
VE
S
GA-Series Aerator Drive Gearboxes
Bearings :
Taper roller bearings from major manufacturers are usedthroughout. These bearings are of ample capacity to supportcombined thrust and radial loads.
Optional Feature :
Rigid coupling on output extension may be provided withsuitable flange dimensions as per customer’s specificrequirement.
Painting :
Casting surfaces are painted with redoxide primer bothinternally and externally. External cast faces are finallyfinished with alkyde semi-gloss blue paint, which is resistantto dilute acids and alkalis, oils and solvents, sea water andtemperatures upto 140oC.
Preservation / Protection :
Greaves Aerator gear units are despatched without oil. Priorto despatch they are test run with a rust preventative oilassuming adequate protection to internal parts for a period of6 months, covering normal transport and covered storage.
GA-Series Aerator Drive Gearboxes
SALIENT FEATURE
Case :
Single piece grey cast iron casing is of rigid construction withnecessary reinforcements. Provided with easily accessibleservice ports they are suitably designed on CAD work stationsto absorb external loads and to dampen noise and vibration.The three point mounting facilitates in achieving alignment.
Helical Gears :
These gears are machined from high quality alloy case-hardening steel, which are individually flank ground toprecision grade accuracy. Case hardened surface with softercore provides improved wear resistance and fatigue strength.
Shafting :
Input and intermediate shafts integral with pinions aremachined from case-hardening alloy steel. Direct hardeningsteel is used in case of output shaft. The cylindrical seats forbearings, wheel, seal, coupling are finished by precisiongrinding. These are also designed to accommodate externaloverhung loads and stresses, as appropriate. Single lip oilseals are provided on plunge ground surfaces to arrest oilleakage and dust entry. Specific requirement towards flangefitment dimensions must be addressed during placement oforder.
Lubrication :
The top bearings are grease lubricated with suitable retainerplates and external nipple provided on covers. The bottomoutput bearing placed within the drywell is also greaselubricated. Other bottom bearings are immersed in sump oil.The gear meshes are lubricated by oil splash.
NOTE :
As improvements in design are being continuously made, this specification is not to be regarded as bindingand is subject to alterations without notice.
1.0 Selection from mechanical rating :
1.1 Gearbox ratio = Input speed / output speed
1.2 Model ratings as listed in rating chart correspond tomaximum mechanical capacities at 1500 rpm inputagainst respective ratios.
1.3 Service power rating
= Mechanical Rating (from table) / service factor *
(* minimum service factor of 2.0 isrecommended for helical gear drives underAerator application)
1.4 Select a suitable model from the table whichrepresents a ratio closest to the desired oneand a service power rating that meets or exceeds the motor power at 1500 rpm.
2.0 Check for thermal rating :
2.1 Thermal ratings are given for gearboxes withoutadditional cooling.
2.2 Determine the thermal service factor from table 1.
2.3 Calculate the required thermal power capacity (Pt), when
Pt = absorbed power/thermal service factor
2.4 Check the model selected mechanically under clause1.4 which should have a thermal rating (as tabled)equaling/exceeding the required capacity Pt. If not, gofor the next higher size.
3.0 Check for bending moment :
3.1 Calculate the actual bending moment experienced bythe gearbox output shaft where,
Bending moment (kNm)
absorbed power (kW)x 9.5 x L (m)= shaft speed x 0.75 R (m)
3.2 Check the bending moment value calculated underclause 3.1 against the capacity limited by shaft stress(ref. Table 2). The actual value should be within thetable figure to make the unit suitable for supporting apaddle directly coupled to the gearbox output shaftand for accepting the bending moment generatedthereby.
GA-Series Aerator Drive Gearboxes
SELECTION PROCEDURE
Table 2Bending Moment Capacity (kNm)Allowable Bending Moment at output shaftlower bearing, limited by shaft stress
Unit Size
112 125 140 160 180 200 225 250
2.3 3.0 4.1 5.8 8.4 12.0 16.8 22.0
Unit Size Nominal Ratio
Input speed rpm
Nominal output
rpm 112 125 140 160 180 200 225 250
25.6 1500 58.6 11.1 15.4 22.1 34.1 49.8 63.8 86.9 125
28.4 1500 52.8 10.1 14.2 20.9 29.8 45.4 62.3 84.0 123
31.4 1500 47.8 8.6 11.9 17.1 26.5 41.2 53.1 74.5 109
34.7 1500 43.2 7.7 10.7 16.7 24.5 38.1 49.4 69.7 102
38.4 1500 39.1 7.0 9.6 14.8 22.4 33.5 48.5 63.0 93.9
42.5 1500 35.3 6.3 8.6 13.2 20.0 30.8 41.2 57.0 85.4
Triple Reduction Units - Vertical Parallel Shafts - Mechanical & Thermal Capacity (kW)
MECHANICAL CAPACITIES (kW)
THERMAL CAPACITY (kW)(Units without fan)
GA-Series Aerator Drive Gearboxes
Unit SizeNominalRatio
Inputspeedrpm
Nominaloutputrpm 112 125 140 160 180 200 225 250
25.6
to
42.5
1500
58.6
to
35.3
8.5 15.4 25.2 33.3 42.3 50 63 75
Table 1 Thermal Service Factor(Gearboxes without additional cooling)
Running Time in any hourAmbientTemperature
OC 100%
80% 60% 40% 20%
10 1.12 1.34 1.57 1.79 2.0520 1.00 1.20 1.40 1.60 1.8030 0.88 1.06 1.23 1.41 1.5840 0.75 0.90 1.05 1.20 1.3550 0.63 0.76 0.88 1.01 1.13
RECOMMENDED LUBRICANTISO VG 320
Brand GradeBalmer Lawrie Protomac SP 320Bharat Petrolium Amocam 320Castrol Alpha SP 320Gulf Harmony HD 320Hindustan Petrolium Parthan 320Indian Oil Servomesh SP 320Veedol Apreslube 320
Approximate Weight & Oil Capacity
Unit Size Net Wt. (Kg.)
Gross Wt. (Kg.)
Oil Qty. (litre)
GA 112 200 230 12 GA 125 245 280 14 GA 140 290 330 16 GA 160 310 360 18 GA 180 330 380 22 GA 200 400 460 25 GA 225 520 600 30 GA 250 650 750 36
GA-Series Aerator Drive Gearboxes
Principal Dimensions(Unless specified otherwise all dimensions are in mm)
SIZE A A1 B C D F F1 G H J L L1 M M1 N GA-112 112 263 372 120 200 112 70 225 85 120 490 16 417 M6 165 GA-125 125 286 406 135 220 125 80 260 95 135 550 16 456 M6 185 GA-140 140 320 470 150 250 140 90 320 105 145 610 16 525 M6 205 GA-160 160 362 532 175 300 160 100 348 115 165 720 16 592 M6 235 GA-180 180 405 585 195 320 175 100 367 145 175 760 16 645 M6 255 GA-200 200 452 680 215 350 185 120 447 155 185 870 18 765 M8 300 GA-225 225 510 750 240 400 205 140 394 170 205 970 18 835 M8 325 GA-250 250 570 800 270 425 220 150 483 185 220 1020 32 900 M16 370
SIZE R S T d E d1 K T1 T2 Z Z1
GA-112 3 40 10 50.018 50.002
200 18.008 17.997
40 20.500 20.400
53.500 53.300
6.000 5.964
14.000 13.957
GA-125 3 45 10 55.030 55.011
210 18.008 17.997
40 20.500 20.400
59.000 58.800
6.000 5.964
16.000 15.957
GA-140 3 50 15 70.030 70.011
240 19.009 18.996
40 21.500 21.400
74.500 74.3000
6.000 5.964
20.000 19.948
GA-160 3 56 15 75.030 75.011
325 22.009 21.996
50 24.500 24.400
79.500 79.300
6.000 5.964
20.000 19.948
GA-180 3 56
20 85.035 85.013
340 25.009 24.996
55 28.000 27.800
90.000 89.800
8.000 7.964
22.000 21.948
GA-200 3 57
20 90.035 90.013
340 28.009 27.996
60 31.000 30.800
95.000 94.800
8.000 7.964
25.000 24.948
GA-225 3 57 25 100.035 100.013
380 32.018 32.002
60 35.000 34.800
106.000 105.800
10.000 9.964
28.000 27.948
GA-250 3 65
25 110.035 110.013
380 38.018 38.002
80 41.000 40.800
116.000 115.800
10.000 9.964
28.000 27.948
GA-Series Aerator Drive Gearboxes
Unit Size Nominal
Ratio 112 125 140 160 180 200 225 250
25.6 25.972 25.392 25.870 25.502 26.320 25.527 26.383 25.946 28.4 28.396 27.762 28.457 28.152 28.318 28.467 28.555 29.278
31.4 31.375 30.793 31.257 31.812 31.600 31.686 32.345 31.449 34.7 35.286 34.632 34.536 35.286 34.853 34.688 35.821 35.634 38.4 39.027 38.304 38.361 39.363 38.606 38.407 39.688 39.037
42.5 43.419 42.614 42.365 43.112 42.404 43.057 43.917 43.192
Exact Ratio
KW FRAME SIZE
d2 d3 d4+ 0.1 0.0
P Q
1.5 90L 200 165 130 4 13 2.2 100L 250 215 180 4 15 3.7 112M 250 215 180 4 15 5.5 132S 300 265 230 4 15 7.5 132M 300 265 230 4 15 9.3 160M 350 300 250 4 18 11 160M 350 300 250 4 18 15 160L 350 300 250 4 18
18.5 180M 350 300 250 4 18 22 180L 350 300 250 4 18 30 200L 400 350 300 4 18 37 225S 450 400 350 4 18 45 225M 450 400 350 4 18 55 250M 550 500 450 8 18
UNIT SIZE
MOTOR FRAME
G UNIT SIZE
MOTOR FRAME
G
132S 245 180L 365 112M 225 180M 365 100L 225 160L 365
112
90L 213
180
160M 365 160M 310 200L 383 132M 260 180L 377 132S 260 180M 377 112M 240
200
160L 377
125
100L 240 225S 430 160M 320 200L 394 132M 270 180L 397
140
132S 270
225
180M 397 180M 348 250M 483 160L 348 225M 470 160M 348 225S 470
160
132M 300
250
200L 422
GA-Series Aerator Drive Gearboxes
PART IDENTIFICATIONItem No. Description Qty.
01 INPUT PINION WITH SHAFT 0102 1ST STAGE WHEEL 0103 2ND STAGE PINION SHAFT 0104 2ND STAGE WHEEL 0105 FINAL PINION SHAFT 0106 OUTPUT WHEEL 0107 OUTPUT SHAFT 0108 INPUT BEARINGS 0209 1ST INTERMEDIATE BEARINGS 0210 2ND INTERMEDIATE BEARINGS 0211 OUTPUT BEARINGS 0212 INPUT OIL SEAL 0113 OUTPUT OIL SEAL 0114 MOTOR MOUNTING ADAPTOR 0115 INPUT FLEXIBLE COUPLING 0116 OUTPUT RIGID COUPLING (OPTIONAL) 01
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GREAVES PRODUCTS(Click the product name to go to the file directly)
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ABM SERIES AERATOR DRIVE
PLANETARY GEARED MOTORS
BEVEL CT FLUID COUPLINGS
EXTRUDER FLEXIBLE COUPLINGS
BEVEL B1 GEARED COUPLINGS
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