Comparison of Gear Trains
Type
Definition
Key Components
Gear Ratio
Characteristics
Applications
Simple
Gears on separate shafts
Driver, Idler(s), Driven
Tdriven/Tdriver
Compound
Multiple gears on same shaftMultiple gears per shaft (T2×T4)/(T1×T3) High speed reduction, compact
Gearboxes, machines
Epicyclic
Gears rotate around sun gear
Sun, Planet, Carrier, RingDepends on fixed/rotating
Compact,parts
high torque, multiple
Transmissions,
outputs
turbines
Reverted
Compound with same input/output
Centeraxis
distances equal T1+T2 = T3+T4 Compact, aligned shafts
Simple, easy design, changes
Clocks,
direction
toys
Clocks, gearboxes
Gear Trains Diagram
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