| Type Selection Gear Box | | | | | 1 | | Determine the type according to the instalation and drive requirements. | | 2 | | Determine the required reduction ratio and input rpm. | | 3 | | According to the conditions and frequency of use, determine the service factor. The multiply the service factor by power output (kW) and output torque. | | 4 | | Select a value from the type selection reference table which meets or exceeds the calue calculated from the above formula. | | 5 | | For extremely high reduction ratios and low-speed operations, output torque must be carefully considered. | | | | |
| [Formula for Horsepower and Torque] | | HP | = | horsepower (1 HP = 75kg.m/sec) | | T | = | torque (kg-m) | | N | = | rpm | | KW | = | 2?NT / (75 x 60) | = | NT | | | 973.7 | | | T | = | 973.7 x KW | | | | | N | | | | | | | | | | |
| Load | Operating Hours per Day | | 30 minutes | 2 hours | 10 hours | 24 hours | | Steady | 0.80 | 0.90 | 1.00 | 1.25 | | (0.90) | (1.00) | (1.25) | (1.50) | | Medium Impact | 0.90 | 1.00 | 1.25 | 1.50 | | (1.00) | (1.25) | (1.50) | (1.75) | | Heavy Impact | 1.00 | 1.25 | 1.50 | 1.75 | | (1.25) | (1.50) | (1.75) | (2.00) | | | | | | |
| Loads | | | | | | | Steady : | | Medium Impact : | Agitators and mixers (liquid/semi-liquid)
Alternators and generators (lighting)
Blowers, exhaust fans, fans (centrifugal-induced draft, light, small-diameter fans)
Conveyors and elevators (uniform feed)
Beverage and food processing machines (bottlers, can fillers, ovens, coolers etc) | | Agitators and mixers (liquids plus solids or variable mixing)
Blowers, exhaust fans, fans (centrifugal-forced draft, large industrial fans, lobed rotor type, vene types)
Conveyors and elevators (non-uniform feed, screw feeders)
Cranes and hoists (main hoist and travel motion, skip hoists)
Laundry equipment (centrifugal driers, tumble driers, reverse-agitating washers) | | | | | Heavy Impact : | | Alternators and generators (welding)
Conveyors and elevators (reciprocating, shaking, apron and pan feeds)
Stone breaking machinery
Papermaking machinery
Drum drives (grader grums, grizzly rolls, etc) | |
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