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Gear reduction

  1. Jun 12, 2014 #1
    I have a 3hp motor, with a torque of 110.85 lb*in. a gear box with a max torque of 6286 lb*in.

    gear box ratio is 57.64:1

    I have gears attached to the gearbox shaft with a gear reduction of 3.375:1.

    My new gear ratio should be 194.53:1 right?....

    which would make my output torque approx. 21,500 lb*in...?

    just checking
  2. jcsd
  3. Jun 12, 2014 #2
    Are you sure about your motor's torque? I ask because you list the gearbox's max torque (is that it's rated torque) at a value that is lower than the motor torque*reduction.

    Also, understand that AC motors (if that's what you are using) are not constant torque machines. They have torque curves, and starting/peak torque can be upwards of 200% (in some cases much higher) of rated torque.

    I'd verify you've got the right parts for the application.

    As per your question, yes, if you have a gearbox with a 57.64:1 ratio and the output of that is subjected to another 3.375:1 reduction, you will have a 194.53:1 reduction and theoretical torque of 21,500 in*lb (depending on efficiency of the powertrain).
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