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Horse Power Rating Chart
AGNEE Bevel Helical Gear Boxes

Double reduction bevel helical gear boxes B2 Type, Transmission Ratio 5.00 - 18.90
Triple reduction bevel helical gear boxes B3 Type, Transmission Ratio 14.0 - 95.7
Quadruple reduction bevel helical gear boxes B4 Type, Transmission Ratio 86.5 - 438
 

 
 

 Gearbox Selection for Horizontal Units
1. Select Gearbox Type

 1.1 Parallel Shafts (helical) or right angle drive (bevel/helical), foot mount, shaft mount with or without foot.

 1.2 Calculate gearbox ratio = Input Speed/ Output speed

 2. Select Gearbox Size from Mechanical Capacity

2.1 Determine type of load from table uniform,

moderate shock or heavy shock).

2.2 Determine mechanical service factor from table 1.

2.3 Calculate the required mechanical power capacity (Pm )
 (Pm ) = absorbed power (kW) x mechanical service factor

 2.4 Select gearbox size from rating tables.
Pm must be equal to or less than the mechanical rating of the gearbox.

 3. Thermal Rating Check

3.1 Thermal ratings are given for the following four cases :

      Gearbox without additional cooling.
 Gearbox fitted with fan.
 Gearbox fitted with cooling water coil.
 Gearbox fitted with fan and coil.

 3.2 Determine the thermal service factor from table 2.

3.3 Calculate the required thermal power capacity (Pt)
(Pt ) = absorbed power (kW) thermal service factor.

 3.4 Specify the type of cooling required by referring to thermal rating tables.

 Pt must be equal to or less than the thermal capacity of the gearbox

.Additional Catalogue Information

1. Gearbox overload capacity at start.

2.5 x mechanical rating, 5 times per day or,

2 x mechanical rating, 5 times per hour.

 2. Intermittent duty.

    Higher power than catalogue mechanical ratings can be transmitted on very intermittent operation within the finite life of the gears. Consult us with specific application details.

Table 1: Mechanical Service Factors (Horizontal & Vertical)

Prime Mover Duration of  service

Load Classifications-Driven Machine

Hrs. Per Day

Uniform

Moderate Shock

Heavy Shock


ELECTRIC MOTOR, Steam Turbines


Under 3
3 to 10
Over 10


0.80
1.00
1.25


1.00
1.25
1.50


1.50
1.75
2.00

         
Multi-Cylinder Internal Combustion
Engine
Under 3
3 to 10
Over 10

1.00
1.25
1.50

1.25
1.50
1.75

1.75
2.00
2.25

   

 

 

Single Cylinder Internal Combustion
Engine
Under 3
3 to 10
Over 10

1.25
1.50
1.75

1.50
1.75
2.00

2.00
2.25
2.50

   

 

 

 

Table 2 : Thermal Service Factors (Horizontal & Vertical)  for ambient temperature and duration of operation.
 

Type Of Cooling

Ambient Temperature

Running Time in Hour

oC

100%

80%

60%

40%

20%

 

 

 

 

 

 

 

Gear Boxes without additional Cooling

10

1.12

1.34

1.57

1.79

2.05

20

1.00

1.20

1.40

1.60

1.80

30

0.88

1.06

1.23

1.41

1.58

40

0.75

0.9

1.05

1.20

1.35

50

0.63

0.76

0.88

1.01

1.13

 

 

 

 

 

 

 

Gear Boxes with Fan

10

1.15

1.38

1.61

1.84

2.07

20

1.00

1.20

1.40

1.60

1.80

30

0.09

1.08

1.26

1.44

1.62

40

0.80

1.96

1.12

1.29

1.44

50

0.70

0.84

0.98

1.12

1.26

 

 

 

 

 

 

 

Gear Boxes with Cooling Coil (1)

10

1.10

1.32

1.54

1.76

1.98

20

1.00

1.20

1.40

1.60

1.80

30

0.09

1.08

1.26

1.44

1.62

40

0.85

1.02

1.19

1.36

1.53

50

0.80

0.96

1.12

1.29

1.44

 

 

 

 

 

 

 

Gear Boxes with Fan & Cooling Coil (1)

10

1.12

1.34

1.57

1.79

2.05

20

1.00

1.20

1.40

1.60

1.80

30

0.92

1.10

1.29

1.47

1.66

40

0.83

1.0

1.16

1.33

1.50

50

0.78

0.94

1.09

1.25

1.40

(1) Based on Cooling -Water Temperature 20 C. 

 

HOW TO ORDER, Selection Example

How to order-Information required when ordering standard gear units

 Prime Mover

1.  

Type - electric motor or engine, for example 4 cylinder internal combustion engine

2.

Power rating in kW

3.

Output speed. If variable, indicate speed range and frequency of variable.

4.

Dimensions of prime mover.

 Driven Machine

1.

Type, for example, kiln, conveyor, etc.

2.

Power rating in kW

3.

Speed

4.

Service - hours per day, running time in any hour, details of reversals if applicable, type of loading, ambient temperature, etc.

  
 Gear Unit

1.

Type, for example, H2.

2.

Size, for example, 315.

3.

Ratio

4.

Shaft handling. Refer to dimension pages and quote reference.

5.

Direction of rotation (for units with right angle shafts refer to handling diagrams on dimension pages). If holdback arrangement is to be fitted, please indicate the direction of rotation of low speed shaft looking towards it.

  
Shaft Connections

1.

Couplings Quote shaft diameters with tolerances or coupling bores.

2.

Details of overhung loads, including diameter and type of sheave, sprocket or pinion and any thrust loads.

  
Shaft mounted units for High Inertia Drive

When used on Traverse drives with inertia driven loads, e.g. crane drives (slewing, long travel and cross travel) bogie drives and selected high inertia load roller table drives, it is recommended that shaft mounted units should be fitted with shock absorbing Torque Arms. Consult us with specific application details.  

Example 1
A foot mounted parallel shaft speed reducer is to be directly coupled to a 750 kW, 1500 rpm motor. The output shaft is to rotate at 365 rpm and is coupled to a large industrial fan absorbs 725 kW on 24 hours/day service. The maximum ambient temperature is 300C.
  
Selection

1.

Gearbox Type

1.1

Parallel shaft type is specified - type H.

1.2

Ratio =1500365
 =4.11, type H1 (single reduction)

2.

Mechanical Capacity

2.1

From table 3 on previous page  the application is moderate shock.

2.2

From table 1 on page 3 the service factor is 1.5.

2.3

The required mechanical capacity = 1.5 x 725 = 1088 kW

2.4

Under mechanical ratings a unit size 315, nominal ratio 4.13, has a capacity of 1293 kW

3.

Thermal Rating Check

3.1

From table 2 on previous page  the thermal service factor for 300C ambient temperature and 100% running time is 0.9 for a unit with fan cooling (reference to the thermal ratings shows that at least fan cooling is required.)

3.2

The required thermal capacity = 725 - 0.9 = 806.

3.3

Under thermal ratings, fan cooled, a size 315 has a capacity of 918 kW at 1500 rpm, ratio 4.15

4.

Check that the exact ratio.

5.

Order a gearbox type H1 - 315 exact ratio 4.15 with cooling fans fitted.

Example 2
A shaft mounted gear unit right angle shafts is required to drive a belt conveyor running 24 hours/day at 80 rpm. The unit must have feet for the attachment of a motor mounting baseplate. The motor is 500 kW at 1500 rpm and the absorbed power at the conveyor headshaft is 465 kW. The ambient temperature on site is 200 C.
  
Selection

1.

Gearbox Type

1.1

Foot shaft mounted unit with right angle shafts.

1.2

Ratio = 150080 = 18.8, type B2SF could be used

2.

Mechanical Capacity

2.1

From table 3 on page 10 the application is uniform load.

2.2

From table 1 on page 3 the service factor is 1.25

2.3

The required mechanical capacity = 1.25 x 465 = 581 kW

2.4

Under mechanical ratings a unit size B3SF - 400, nominal ratio 18.9, has a capacity of 620 kW. The double reduction type B2SF - 400 ratio 18.9 has insufficient mechanical capacity.

3.

Thermal Rating Check

3.1

From table 2 on previous page  the thermal service factor for 200 C. ambient temperature and 100% running time is 1.0

3.2

The required thermal capacity = 4651.0 = 465 kW.

3.3

Under thermal ratings, fan cooled, a size 400 at 1500 rpm has a capacity of 484kW

4.

Check that the exact ratio.

5.

Order a gearbox type B3SF - 400, exact ratio with cooling fans fitted.

OVERHUNG LOADS / AXIAL THRUST LOADS - HORIZONTAL UNITS

Whenever a sprocket, gear, sheave or pulley is mounted on the shaft, a calculation should be made to determine the overhung load in kN on the shaft, using the formula :

p

 = 

kW x 9545 x K N x R

Where P

 = 

equivalent overhung load in kN,

kW

=

power carried by the shaft,

N

=

rpm of the shaft

R

=

pitch radius of sprocket, pinion,

sheave or pulley (mm).

  

Overhung member

 K Factor

Sprocket for chain

1

Spur gear

1.25

V belt sheave

1.5

Flat belt pulley

3.0

  
Notes :

1.  

Values are calculated for the most unfavourable direction of rotation. Consult us with specific application details.

2.

Overhung load values are for loads applied midway along shaft extension.

3.

For overhung load and axial thrust values for large sizes consult us.

 

 

Table 4 : Permissible Overhung Load on Low Speed Shaft (kN)  (Horizontal Units)
 

Direction
of
Load

Output
Speed
(rpm)

Types H2-H3-B2-B3
Unit Size

200

225

250

280

315

355

400

450

1

315

35

42

47

56

78

100

100

172

200

40

48

57

68

87

118

126

190

125

48

55

62

85

103

132

150

228

80

52

68

78

97

130

162

190

280

50

52

68

90

126

148

182

228

320

31.5>

52

68

90

126

148

182

230

320

2

315

35

42

47

56

78

100

109

172

200

40

48

62

85

87

118

126

190

125>

41

48

62

85

99

120

150

215

3

315>

18

23

30

42

49

61

78

107

 
Table 5 : Permissible Overhung Load High Speed Shaft at 1500 rpm (kN)  (Horizontal Units)
 

Type of
Unit

Unit Size

200

225

250

280

315

355

400

450

H2-H2S-H2SF

8.45

10.5

13.0

19.5

26.5

32.2

38.7

45.8

H3-H3S-H3SF

3.03

4.58

6.45

8.4

10.5

13.0

20.0

28.9

B2-B2S-B2SF

12.0

15.6

19.6

25.4

30.6

36.0

41.3

49.8

B3-B3S-B3SF

3.03

7.12

8.90

12.0

15.6

19.6

25.4

30.6

 

 

Table 6 : Permissible Axial Thrust on Low Speed Shaft (kN)
 (Horizontal Units)

 

Output
Speed
rpm

Type H2-H3-B2-B3

200

225

250

280

315

355

400

450

315

12.0

12.5

13.4

11.8

18.3

30.3

28.8

53.4

200

13.4

14.2

15.2

13.3

20.8

34.3

32.6

60.5

125

17.1

17.3

18.0

18.4

25.3

40.0

40.9

70.8

80

18.2

20.5

21.8

23.8

35.6

63.6

55.4

80.85

50

19.4

25.8

25.3

32.1

43.5

66.3

68.5

94.3

31.5 and
below

19.4

25.8

25.3

34.3

55.6

66.3

88.6

94.3

 

LOAD CLASSIFICATION BY APPLICATION

LOAD CLASSIFICATION BY APPLICATION-BEVEL HELICAL GEARBOX
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