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22.322 Mechanical Design II. Spring 2013. Lecture 12. 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.

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22.322 Mechanical Design II

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Lecture 12
Lecture 12

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


Lecture 121
Lecture 12

The Formula Method

Usually an input

Usually an unknown


Lecture 122
Lecture 12

The Formula Method


Lecture 123
Lecture 12

The Formula Method


Lecture 124
Lecture 12

The Formula Method


Lecture 125
Lecture 12

The Formula Method


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