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Learning with Purpose February 20, 2013 Learning with Purpose February 20, 2013 22.322 Mechanical Design II Spring 2013

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Page 1: Learning with Purpose February 20, 2013 Learning with Purpose February 20, 2013 22.322 Mechanical Design II Spring 2013

Learning with Purpose February 20, 2013Learning with Purpose February 20, 2013

22.322 Mechanical Design II

Spring 2013

Page 2: Learning with Purpose February 20, 2013 Learning with Purpose February 20, 2013 22.322 Mechanical Design II Spring 2013

Learning with Purpose February 20, 2013

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.

Lecture 12

Planetary Gear Trains

Note how planet gear orbits around sun gear

Page 3: Learning with Purpose February 20, 2013 Learning with Purpose February 20, 2013 22.322 Mechanical Design II Spring 2013

Learning with Purpose February 20, 2013

Lecture 12

The Formula Method

Usually an input

Usually an unknown

Page 4: Learning with Purpose February 20, 2013 Learning with Purpose February 20, 2013 22.322 Mechanical Design II Spring 2013

Learning with Purpose February 20, 2013

Lecture 12

The Formula Method

Page 5: Learning with Purpose February 20, 2013 Learning with Purpose February 20, 2013 22.322 Mechanical Design II Spring 2013

Learning with Purpose February 20, 2013

Lecture 12

The Formula Method

Page 6: Learning with Purpose February 20, 2013 Learning with Purpose February 20, 2013 22.322 Mechanical Design II Spring 2013

Learning with Purpose February 20, 2013

Lecture 12

The Formula Method

Page 7: Learning with Purpose February 20, 2013 Learning with Purpose February 20, 2013 22.322 Mechanical Design II Spring 2013

Learning with Purpose February 20, 2013

Lecture 12

The Formula Method