Epicyclic gear:modules for the sun,planet and ring gear

  • #1
255
3
Is the module(M) of the sun,planet and ring gear in a 'planetary gear set' equal to each other always? Is it possible for M to be different for each of the gears in the set?[-Applications of this?]

$$PCD_{Ring}=PCD_{Sun}+2*PCD_{Planet}\Rightarrow N_{Ring}=N_{Sun}+2*N_{Planet}$$

is valid only when the modules of all the 3 gear types are same.

where,
PCD- pitch circle diameter
N- no. of teeth
 

Answers and Replies

  • #2
Baluncore
Science Advisor
8,992
3,571
All gears that mesh together must be of the same module or DP.
If that was not so the teeth would not be in rolling contact.
 

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