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22.322 Mechanical Design II

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22.322 Mechanical Design II

Spring 2013

Planetary Gear Trains

- The conventional gear trains described in the previous lectures are all one-degree-of-freedom devices.
- Planetary gear trains are two-DOF devices two inputs are needed to obtain a predictable output.
- Planetary gear trains are used because they can obtain very large or small gear ratios and are able to transmit more power than ordinary gear trains.

Note how planet gear orbits around sun gear

The Formula Method

Usually an input

Usually an unknown

The Formula Method

The Formula Method

The Formula Method

The Formula Method