Planetary Gearboxes
Planetary Gearboxes consists of three major components:
Sun gear
Planet gear
Ring gear
The sun gear is meshed around with the planet gears, which in turn are meshed with ring gear. Planet gears are connected to each other by a carrier, which helps them to rotate around the sun gear.
planetary-gearboxes1
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Advantages of Planetary system over helical gearbox:
They are compact and take less space and are light weight, as the load is shared between the planet gears.
The noise and vibration is reduced as the load is shared. This also increases efficiency.
Since the shafts are inline and concentric, bending moment is absent.
The manufacturing of these components is relatively cheaper due to smaller size as compared to parallel axis gearboxes.
Disadvantages:
The gear system is complex and needs precision manufacturing.
Teeth ratios are specific and assemble is according to them.
Calculations of efficiency are a bit difficult.
