Calculating Gear ratio!

  • Thread starter namith11
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  • #1
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Main Question or Discussion Point

Hey,
I want to know how to calculate the gear ratio of the given arrangement in the picture. Im not sure of how to calculate the gear ratio of two gears on the same shaft. Also the input gear is helical and the output gear is a spur gear. I have mentioned the number of gear teeth, i hope that is enough. Im very confused. Please help!!!!!
gearbox1.jpg
 

Answers and Replies

  • #2
Baluncore
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If I read it correctly, the ratios of gear pairs are;
driver : driven
7 : 58 = 0.12069
19 : 51 = 0.3725
15 : 54 = 0.2777
The result is ( 7 * 19 * 15 ) / (58 * 51 * 54 ) = 0.0125
or 80.066 : 1

Helical gears behave the same as spur gears. Helical gears are quieter at high speeds so they are used here for the high speed, low torque, input shaft.
 
  • #3
Baluncore
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The diameters in your diagram appear to be tip diameters not pitch circle diameters which explains the slight ratio difference between tooth count and diameters.
 

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